Tornado outbreak of September 24, 2001

Last updated
Tornado outbreak of September 24, 2001
College Park to Laurel Tornado.jpg
Picture of the tornado which hit the University of Maryland, College Park campus, killing two people.
TypeTornado outbreak
DurationSeptember 24, 2001;22 years ago (2001-09-24)
Tornadoes
confirmed
9
Max. rating1 F4 tornado
Fatalities2 fatalities, 57 injuries
Damage$105.157 million (2001 USD) $129.718 million (2010 USD)
Areas affected Eastern United States (primarily the Mid-Atlantic states)
Part of the tornadoes of 2001

1Most severe tornado damage; see Fujita scale
A Doppler weather radar image of the College Park tornado near its peak at 21:21 UTC 09-24-01 CollegeParkMD tor.PNG
A Doppler weather radar image of the College Park tornado near its peak at 21:21 UTC

The tornado outbreak of September 24, 2001 was one of the worst tornado events to ever have directly affected the Baltimore-Washington metropolitan area in the United States. [1] The outbreak occurred on Monday, September 24, 2001, and was responsible for two deaths and 57 injuries. [2]

Contents

Meteorological synopsis

On September 24, 2001, a trough in the mid- to upper-levels of the troposphere was tracking across the eastern U.S., accompanied by a cold front sweeping across the Appalachian Mountains. The Storm Prediction Center (SPC) predicted that atmospheric instability ahead of the front would be sufficient to support the development of thunderstorms during the day. Additionally, the anticipated storms were expected to emerge within an area of 45–55 knots (52–63 mph; 83–102 km/h) wind shear, suggesting that development of supercells was possible; [3] these environmental characteristics were also similar to other severe weather events in the Mid-Atlantic. [4] Considering these factors, the SPC assessed a slight risk of severe weather for parts of the Mid-Atlantic states on September 24. [3] By 12:00  UTC (8:00 a.m. EDT), moisture had moved northwards ahead of the approaching cold front across the East Coast, with dew points exceeding 70 °F (21 °C) as far north as Maryland. Towards the late morning, a small low-pressure area emerged over western North Carolina, producing a small area of higher wind shear and resulting in a locally enhanced threat for severe weather along its trajectory towards the northeast. Weather radar detected weak rotation within thunderstorms forming over central North Carolina between 16:30–17:00 UTC. [5] In response to the development of these storms and the favorable conditions afforded by the approaching low-pressure area, the SPC issued a tornado watch for parts of Maryland, Virginia, West Virginia, and the District of Columbia at 17:19 UTC. [5] [6] A thunderstorm formed near Charlottesville, Virginia, following the watch's issuance, while another thunderstorm formed southwest of Fredericksburg, Virginia, around 19:00 UTC. These two storms became supercell thunderstorms as they tracked northeast along with the low-pressure area, producing several tornadoes including an F4 tornado in Culpeper County, Virginia, and an F3 tornado that moved across College Park, Maryland. [5]

Component storms

The first tornado of the outbreak was also the strongest – an F4 (see Fujita scale) tornado that left a 10-mile-long damage path through rural Culpeper and Fauquier Counties in Virginia. Weak (F1) tornadoes east of Warrenton, and just west of Dulles International Airport soon followed.

The September 24, 2001 tornado, with the Washington Monument visible at lower right Washington D.C. tornado.jpg
The September 24, 2001 tornado, with the Washington Monument visible at lower right

A second supercell to the southeast spawned the family of tornadoes that moved through Washington. A first tornado (F0) was confirmed in the Quantico, and nearby Prince William Forest Park areas; this was soon followed by an F1 tornado that left a 15-mile-long path parallel to I-95 and I-395 through Franconia, western Alexandria, and southeastern Arlington. This tornado dissipated near the west end of the National Mall in Washington, D.C., and was followed by many reports of funnel clouds. The storm affected workers at the Pentagon who were mending the damage from the September 11 terrorist attacks.

The same storm soon produced a powerful, multiple-vortex F3 tornado in College Park, Maryland. This storm moved at peak intensity through the University of Maryland, College Park campus, and then moved parallel to I-95 through the Beltsville, Maryland, area, where the tornado caused extensive damage to greenhouses and other facilities of the USDA Beltsville Agricultural Research Center. [7] The storm continued on to Laurel, Maryland, where F3 damage was also noted. The damage path from this storm was measured at 17.5 miles in length, and this tornado caused two deaths and 55 injuries, along with $101 million in property damage.

The two deaths at College Park were Colleen and Erin Marlatt, who died when their car was picked up by the tornado near the Easton Hall dormitory and thrown into a tree in a parking area. [8]

Confirmed tornadoes

Confirmed tornadoes by Fujita rating
FUF0F1F2F3F4F5Total
03311109
List of reported tornadoes – September 24, 2001
F# LocationCountyCoord.Time (UTC)Path lengthDamage
Virginia and Washington, D.C.
F4 Rixeyville to NE of Waterloo Culpeper, Fauquier 38°09′N78°13′W / 38.150°N 78.217°W / 38.150; -78.217 190310 miles (16 km)Tornado touched down in Rixeyville, blowing a tree onto a house. The tornado rapidly intensified into an F4 outside of town, flattening a well built three-story brick house. Debris from this house was found half a mile away. The tornado weakened to an F2 as it struck Jeffersonton, where extensive tree damage occurred and 4 churches were damaged. Four trailers were damaged and three others were destroyed in a trailer park as well. Continuing northeast of Jeffersonton, the tornado damaged the porch and roof of a house, damaged the sunroom of another house, and destroyed a garage. The roof was torn off of a barn before the tornado dissipated. [9]
F1W of Gordonsville Orange 38°34′N77°59′W / 38.567°N 77.983°W / 38.567; -77.983 19350.2 miles (0.32 km)Several trees were downed. [10]
F1NW of The Plains Fauquier 38°51′N77°47′W / 38.850°N 77.783°W / 38.850; -77.783 19496 miles (9.7 km)A porch was ripped off of a house and deposited 50 feet away. Pieces of lumber from the house were hurled into nearby vehicles. Two other houses were damaged as well, and a small poolhouse was destroyed. Extensive tree and power line damage occurred as well. [9]
F0 Garrisonville area Stafford, Prince William 38°29′N77°25′W / 38.483°N 77.417°W / 38.483; -77.417 201012 miles (19 km)Trees were downed and a house sustained damage to its siding. [9]
F1 Franconia to Washington, D.C. Fairfax, Alexandria, Arlington, District of Columbia 38°44′N77°11′W / 38.733°N 77.183°W / 38.733; -77.183 204411 miles (18 km)Tornado began in Virginia, damaging trees, power lines, and roofs in suburban areas. The tornado crossed into Washington, D.C., where it passed the Jefferson Memorial and crossed the Tidal Basin, snapping tree branches. It was seen passing just south of the Washington Monument, headed for the Smithsonian buildings and the Capitol. Tree branches were snapped and swirling debris was observed in that area before the tornado dissipated. [11] [9]
Maryland
F3 Chillum to Savage Prince George's, Howard 38°56′N76°59′W / 38.933°N 76.983°W / 38.933; -76.983 211917.5 miles (28.2 km)2 deaths – Multiple vortex tornado moved through several DC suburbs. Major damage occurred in and around College Park, Beltsville, and Laurel. The University of Maryland sustained major damage, where 10 trailer classrooms were torn apart and one was thrown 200 yards. Many trees were snapped and uprooted on campus, and vehicles were thrown and flipped. A car carrying two young female students was hurled several hundred yards and over a high-rise 8-story dormitory building, resulting in two fatalities. Other buildings on campus sustained damage to roofs, windows, and trim. The U.S. Dept. of Agriculture's Research Center sustained $41 million in damage. 861 homes, 560 vehicles, and 23 businesses were damaged or destroyed in Prince George's County alone. Light debris was carried up to 60 miles away. Caused a total of $73 million in damage and injured 50 people. [9]
Pennsylvania
F2 Parkville York 39°44′N76°59′W / 39.733°N 76.983°W / 39.733; -76.983 23335 miles (8.0 km)8 homes had their roofs torn off, and several others sustained lesser damage. Trees were downed, 38 cars were damaged at a dealership, and roof damage occurred at a middle school and an administration building. A store complex sustained significant structural damage. [12]
New York
F0W of Fabius Onondaga unknownunknown.5 miles (0.80 km)Several trees were downed and a shed was destroyed. [13]
North Carolina
F0N Aulander Bertie unknownunknown1 mile (1.6 km)Two homes and multiple trees were damaged. [14]

See also

Related Research Articles

<span class="mw-page-title-main">2000 Fort Worth tornado outbreak</span> Natural disaster in downtown Fort Worth, Texas, United States on 2000

During the evening hours of March 28, 2000, a powerful F3 tornado struck Downtown Fort Worth, Texas, causing significant damage to numerous buildings and skyscrapers as well as two deaths. The tornado was part of a larger severe weather outbreak that caused widespread storms across Texas and Oklahoma in late-March, spurred primarily by the moist and unstable atmospheric environment over the South Central United States as a result of an eastward-moving upper-level low and shortwave trough. The tornado outbreak was well forecast by both computer forecast models and the National Weather Service, though the eventual focal point for the severe weather—North Texas—only came into focus on March 28 as the conditions favorable for tornadic development quickly took hold.

<span class="mw-page-title-main">Tornado outbreak of April 27–28, 2002</span> Tornado Outbreak in April 2002

A widespread, destructive tornado outbreak affected Iowa, Kansas, Missouri, and Nebraska on April 27, 2002, and Illinois, Indiana, Kentucky, Maryland, New York, Ohio, Pennsylvania, Tennessee, Virginia, and West Virginia on the following day, April 28. Generally, tornado reports were widely scattered in each state, but significant to severe damage was noted in multiple states. Overall, 48 tornadoes were confirmed along with 6 deaths, 256 injuries, and $224 million in damage, with wind and hail adding to the damage total.

<span class="mw-page-title-main">Tornado outbreak sequence of May 2003</span>

From May 3 to May 11, 2003, a prolonged and destructive series of tornado outbreaks affected much of the Great Plains and Eastern United States. Most of the severe activity was concentrated between May 4 and May 10, which saw more tornadoes than any other week-long span in recorded history; 335 tornadoes occurred during this period, concentrated in the Ozarks and central Mississippi River Valley. Additional tornadoes were produced by the same storm systems from May 3 to May 11, producing 363 tornadoes overall, of which 62 were significant. Six of the tornadoes were rated F4, and of these four occurred on May 4, the most prolific day of the tornado outbreak sequence; these were the outbreak's strongest tornadoes. Damage caused by the severe weather and associated flooding amounted to US$4.1 billion, making it the costliest U.S. tornado outbreak of the 2000s. A total of 50 deaths and 713 injuries were caused by the severe weather, with a majority caused by tornadoes; the deadliest tornado was an F4 that struck Madison and Henderson counties in Tennessee, killing 11. In 2023, tornado expert Thomas P. Grazulis created the outbreak intensity score (OIS) as a way to rank various tornado outbreaks. The tornado outbreak sequence of May 2003 received an OIS of 232, making it the fourth worst tornado outbreak in recorded history.

<span class="mw-page-title-main">Tornadoes of 2011</span>

This page documents the tornadoes and tornado outbreaks of 2011. Extremely destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada during the Northern Hemisphere's summer season, and somewhat regularly in Europe, Asia, and Australia.

<span class="mw-page-title-main">2010 New Year's Eve tornado outbreak</span> 2010 windstorm in the midwestern and southern United States

The 2010 New Year's Eve tornado outbreak was a three-day-long tornado outbreak that impacted the central and lower Mississippi Valley from December 30, 2010 to January 1, 2011. Associated with a low pressure system and a strong cold front, 37 tornadoes tracked across five states over the length of the severe event, killing nine and injuring several others. Activity was centered in the states of Missouri and later Mississippi on December 31. Seven tornadoes were rated EF3 on the Enhanced Fujita Scale; these were the strongest during the outbreak. Non-tornadic winds were recorded to have reached as high as 80 mph (130 km/h) at eight locations on December 31, while hail as large as 2.75 in (7.0 cm) was documented north-northeast of Mansfield, Missouri. Overall, damage from the outbreak totaled US$123.3 million, most of which was related to tornadoes. This is the most prolific tornado outbreak in Missouri in the month of December.

<span class="mw-page-title-main">June 12–13, 2013, derecho series</span> Series of weather events

From June 12 to June 13, 2013, two derechos occurred across different areas of the Eastern United States. The initial derecho formed on the afternoon of June 12 and tracked across a large section of the Midwestern United States, the central Appalachians, and the Mid-Atlantic states before moving into the Atlantic Ocean during the morning of June 13. A second, more widespread and intense derecho occurred on June 13 across the Southeastern United States, resulting in major wind damage across North Carolina, Virginia, and Maryland, among other states. These storms caused at least three deaths and extensive damage property damage – resulting from both tornadoes and straight-line winds – from Iowa to South Carolina. 28 tornadoes touched down in Iowa, Illinois, Ohio, Georgia, North Carolina, Maryland, Virginia, and Tennessee. One of the tornadoes in Iowa was rated as a high-end EF3, destroying a restaurant and two houses. One person was injured by another tornado, rated EF2, in Carroll County, Illinois, and nine people were injured by an EF1 in Cherokee County, Georgia.

<span class="mw-page-title-main">Tornadoes of 2014</span>

This page documents the tornadoes and tornado outbreaks of 2014. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, Brazil, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada during the Northern Hemisphere's summer season, and somewhat regularly in Europe, Asia, and Australia.

The following is a glossary of tornado terms. It includes scientific as well as selected informal terminology.

<span class="mw-page-title-main">Tornadoes of 2017</span>

This page documents notable tornadoes and tornado outbreaks worldwide in 2017. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, Argentina and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,522 reports of tornadoes in the United States in 2017, of which 1,418 were confirmed. Worldwide, 43 fatalities were confirmed in 2017: 35 in the United States, five in China, two in Paraguay, and one in Brazil.

<span class="mw-page-title-main">Tornadoes of 2018</span>

This page documents notable tornadoes and tornado outbreaks worldwide in 2018. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, Argentina and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,169 preliminary filtered reported tornadoes and 1,121 confirmed tornadoes in the United States in 2018. Worldwide, 17 tornado-related deaths were confirmed; 10 in the United States, four in Brazil, two in Indonesia, and one in Canada.

<span class="mw-page-title-main">Tornadoes of 2020</span>

This page documents notable tornadoes and tornado outbreaks worldwide in 2020. Strong and destructive tornadoes form most frequently in the United States, Argentina, Brazil, Bangladesh, and eastern India, but can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, Argentina, Australia and New Zealand. Tornadic events are often accompanied by other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,243 preliminary filtered reported tornadoes in 2020 in the United States in 2020, and 1,086 confirmed tornadoes in the United States in 2020. Worldwide, at least 93 tornado-related deaths were confirmed with 78 in the United States, eight in Vietnam, two each in Canada, Indonesia, and Mexico, and one in South Africa.

<span class="mw-page-title-main">Tornado outbreak of February 5–7, 2020</span> 2020 tornado outbreak in the United States

There was a multi-day severe weather and tornado outbreak impacted the Southeastern and Mid-Atlantic United States from February 5–7. A powerful upper-level trough progressed eastward across the country, intersecting an abundant supply of moist air to produce severe weather. An eastward-propagating cold front supported a damaging squall line across the Southeast U.S. on February 5–6; supercell thunderstorms ahead of this line also produced numerous tornadoes. One EF1 tornado in the pre-dawn hours of February 6 killed one person in Demopolis, Alabama. On the morning of February 7, a secondary front progressed across Maryland and Virginia, unexpectedly leading to hundreds of damaging wind reports across Virginia, Maryland, Delaware, New Jersey, New York, Connecticut, Rhode Island, and Massachusetts. Five tornadoes were reported in the Washington, D.C., area, the most on record for a wintertime severe weather event. Across the three-day outbreak, 37 tornadoes were confirmed, including several that were strong and long-tracked.

<span class="mw-page-title-main">Hurricane Isaias tornado outbreak</span> Outbreak of tornadoes in the eastern U.S. (2020)

As Hurricane Isaias moved up the East Coast of the United States, a damaging outbreak of 39 tornadoes impacted areas from South Carolina to Connecticut between August 3–4, 2020. The most significant tornado of the outbreak was a large and intense EF3 tornado that obliterated a mobile home park near Windsor, North Carolina, killing two and injuring 14. This was the strongest tornado in the United States to be spawned by a tropical cyclone since 2005. In the end, the outbreak killed two and injured 26.

<span class="mw-page-title-main">Tornadoes of 2021</span>

This page documents notable tornadoes and tornado outbreaks worldwide in 2021. Strong and destructive tornadoes form most frequently in the United States, Argentina, Brazil, Bangladesh, and Eastern India, but can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, Argentina, Australia and New Zealand. Tornadic events are often accompanied by other forms of severe weather, including strong thunderstorms, strong winds, and hail. Worldwide, 150 tornado-related deaths were confirmed with 103 in the United States, 28 in China, six in the Czech Republic, four in Russia, three in Italy, two in India, and one each in Canada, New Zealand, Indonesia, and Turkey.

<span class="mw-page-title-main">Tornado outbreak sequence of March 24–28, 2021</span> Outbreak of tornadoes and severe weather in the United States

A significant tornado outbreak sequence took place from March 24–28, 2021 in the Southern United States, just one week after another outbreak affected similar regions. There were 43 tornadoes confirmed across 11 states, with the bulk of activity primarily on March 25, which resulted in the Storm Prediction Center (SPC) issuing its second high-risk outlook for the month of March, as well as the second high-risk outlook for 2021. Several intense tornadoes touched down on that day, including ones that prompted the issuance of rare tornado emergencies near Hoover, Alabama, Brent and Centreville, Alabama, and in the Newnan, Georgia area. March 27 also saw widespread tornado activity mainly across East Texas, Southern Arkansas, Louisiana, and Western Tennessee with several strong tornadoes touching down. Scattered to widespread wind and hail damage occurred throughout the outbreak sequence, and repeated rounds of heavy rain caused widespread severe flash and river flooding across much of Tennessee.

<span class="mw-page-title-main">Hurricane Ida tornado outbreak</span> 2021 tornado outbreak

Hurricane Ida generated a tornado outbreak as it traversed the Southeastern, Mid-Atlantic, and Northeastern United States. Thirty-five confirmed tornadoes touched down from Mississippi to Massachusetts; one person was killed in Upper Dublin Township, Pennsylvania, and several people were injured in Alabama, New Jersey, and Pennsylvania. The most active and destructive part of the outbreak occurred during the afternoon of September 1, when several strong tornadoes struck Maryland, New Jersey, and Pennsylvania, including an EF3 tornado which impacted Mullica Hill, New Jersey. The same storm later dropped an EF1 tornado that prompted a tornado emergency for Burlington, New Jersey and Croydon, and Bristol, Pennsylvania, the first of its kind in the Northeast, as well as the first such alert associated with a tropical cyclone or it's remnants. This outbreak severely impacted New Jersey and the Philadelphia Metropolitan Area, a region which had been significantly impacted by strong tornadoes from another outbreak that occurred just over a month prior, as well as several weak tornadoes from the remnants of Tropical Storm Fred two weeks earlier. Overall, the 36 tornadoes killed one person and injured seven others.

<span class="mw-page-title-main">Tornadoes of 2022</span> List of notable tornadoes occurring in 2022

This page documents notable tornadoes and tornado outbreaks worldwide in 2022. Strong and destructive tornadoes form most frequently in the United States, Argentina, Brazil, Bangladesh, and Eastern India, but can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, Argentina, Australia and New Zealand. Tornadic events are often accompanied by other forms of severe weather, including strong thunderstorms, strong winds, and hail. Worldwide, 32 tornado-related deaths were confirmed: 23 in the United States, three in China, two each in Poland and Russia, and one each in the Netherlands and Ukraine.

<span class="mw-page-title-main">Tornado outbreak of March 5–7, 2022</span> Early spring tornado outbreak in the Midwestern United States

A significant early spring tornado outbreak occurred during the afternoon and evening hours of March 5, 2022 in the Midwest, primarily in the state of Iowa, before transitioning to a damaging wind event across northern parts of Illinois and Indiana. Multiple tornadoes were reported, several of which were produced by a dominant supercell thunderstorm in central Iowa. One long-track, low-end EF4 tornado caused major damage near the towns of Winterset and Norwalk, resulting in six fatalities. Multiple other supercells spawned along an area of moderate destabilization in northern Missouri, prompting further tornado warnings in southern Iowa, as they entered a highly favorable environment for maturing. Large hail and damaging wind gusts accompanied the storms, which continued their passage across the Midwestern states into overnight. More tornadic weather was confirmed in Arkansas and Missouri the next day and into the early morning of March 7. In addition to that, straight line winds killed one person near Hazel, Kentucky when a semi trailer was blown over on US 641. Another non-tornadic fatality occurred in western New York as the storm approached.

<span class="mw-page-title-main">Tornado outbreak of November 29–30, 2022</span> Late-season tornado outbreak in the Southern United States

A late-season tornado outbreak in the Southern United States affected the states of Louisiana, Mississippi, Alabama, and Georgia, from the afternoon of November 29 into the morning of November 30, 2022. The outbreak was the result of an intense upper-level trough that materialized over the aforementioned states where increased moisture, atmospheric instability, and elevated wind shear were present, creating conditions highly conducive to supercell thunderstorms. Multiple tornadic storms developed in the risk area, producing numerous tornadoes. Several of these tornadoes were strong and destructive, prompting the issuance of multiple PDS tornado warnings. Two low-end EF3 tornadoes caused severe damage near Clarks, Louisiana and Tibbie, Alabama respectively while the Flatwood and Willow Springs communities north of Montgomery, Alabama was struck by an EF2 tornado, which caused two fatalities. Numerous weaker tornadoes also touched down, including a high-end EF1 tornado that caused considerable damage in Eutaw, Alabama. In all, 27 tornadoes were confirmed.

<span class="mw-page-title-main">Tornado outbreak and derecho of April 1–3, 2024</span> Tornado outbreak that impacted the US

From April 1 to 3, 2024, a significant tornado outbreak, which also included a derecho, affected much of the Midwestern and Southeastern United States. The National Weather Service issued dozens of severe thunderstorm and tornado warnings across West Virginia, Kentucky, Tennessee, Ohio, Oklahoma, Kansas, Illinois, Indiana, and Missouri during the event. A total of 32 million people were estimated to be under watches or warnings, and over 150,000 people were estimated to be without power. and 15 people were injured. The event was given an outbreak intensity score of 28 points, ranking it as a significant tornado outbreak, and five people were killed by non-tornadic events as well.

References

  1. "Killer Twisters Strike Washington Area". NOAA News. September 25, 2001. Retrieved October 8, 2017.
  2. "Tornadoes in the Past". Archived from the original on November 9, 2006. Retrieved May 22, 2017.
  3. 1 2 Evans, Jeffrey S. (September 24, 2001). "Day 1 Convective Outlook Issued 2001-09-24 05:44 UTC". Norman, Oklahoma: Storm. Retrieved December 18, 2021 via Iowa Environmental Mesonet.
  4. Zubrick, Steven M.; Watson, Barbara M. (August 15, 2002). The Washington DC Tornado of 24 September 2001: Pre-Storm Environment and Radar Perspectives (PDF). 21st Conference on Severe Local Storms. San Antonio, Texas. Retrieved December 18, 2021.
  5. 1 2 3 Davies, Jonathan M.; Hart, John A. (August 15, 2002). Mesoscale Environment Factors in the D.C. Area Tornado Event of 24 September 2001 (PDF). 21st Conference on Severe Local Storms. San Antonio, Texas. Retrieved December 18, 2021.
  6. Hart, John A. (September 24, 2001). "Tornado Watch Number 758". Norman, Oklahoma: Storm Prediction Center. Retrieved December 18, 2021 via Iowa Environment Mesonet.
  7. USDA research center severely damaged in tornado. (press release) United States Department of Agriculture, September 25, 2001. Retrieved on 2008-12-22.
  8. Dresser, Michael; MacGillis, Alec (September 25, 2001). "Tornado kills two UM students". The Virginia Gazette . Archived from the original on May 1, 2015. Retrieved April 18, 2013.
  9. 1 2 3 4 5 "September 24, 2001 Tornadoes". National Weather Service, Baltimore-Washington Forecast Office. Archived from the original on March 10, 2003.
  10. "Storm Events Database: Event 5270145". National Centers for Environmental Information. Retrieved October 8, 2017.
  11. "Tornado kills two, damages University of Maryland". USA Today. Associated Press. September 25, 2001. Archived from the original on October 6, 2001.
  12. "Storm Events Database: Event 5263658". National Centers for Environmental Information. Retrieved October 8, 2017.
  13. "Storm Events Database: Event 5262766". National Centers for Environmental Information. Retrieved October 8, 2017.
  14. "Storm Events Database: Event 5267883". National Centers for Environmental Information. Retrieved October 8, 2017.