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A tornado emergency is an enhanced version of a tornado warning, which is used by the National Weather Service (NWS) in the United States during imminent, significant tornado occurrences in highly populated areas. Although it is not a new warning type from the NWS, issued instead within a severe weather statement or in the initial tornado warning, a tornado emergency generally means that significant, widespread damage is expected to occur and a high likelihood of numerous fatalities is expected with a large, strong to violent tornado.
The tornado outbreak of October 17–19, 2007 was a widespread tornado outbreak that took place across much of the eastern half of North America starting on October 17, 2007, and continuing into the early hours of October 19. The outbreak was also responsible for five deaths; three in Michigan and two in Missouri, plus many injuries. At least 64 tornadoes were confirmed including 16 on October 17 across six states including Texas, Oklahoma, Arkansas, Louisiana, Mississippi and Missouri with wind damage reported in Oklahoma, Kansas, Illinois, Iowa, Arkansas and Mississippi. On October 18, at least 48 tornadoes were confirmed across eight states including Florida, Alabama, Mississippi, Tennessee, Kentucky, Illinois, Indiana and Michigan, plus widespread straight line wind damage. Until 2010, this event held the record for largest tornado outbreak ever recorded in the month of October according to NOAA.
A satellite tornado is a tornado that revolves around a larger, primary tornado and interacts with the same mesocyclone. Satellite tornadoes occur apart from the primary tornado and are not considered subvortices; the primary tornado and satellite tornadoes are considered to be separate tornadoes. The cause of satellite tornadoes is not known. Such tornadoes are more often anticyclonic than are typical tornadoes and these pairs may be referred to as tornado couplets. Satellite tornadoes commonly occur in association with very powerful, large, and destructive tornadoes, indicative also of the strength and severity of the parent supercell thunderstorm.
A destructive and deadly tornado outbreak that took place across the Southern and Central United States from May 1 to May 3, 2008. The outbreak was responsible for at least seven fatalities and 23 injuries in Arkansas. There were at least 29 tornado reports from Iowa to Oklahoma on May 1 and 67 more in Arkansas, Missouri, Mississippi, Tennessee, Louisiana and Texas on May 2. A total of 60 tornadoes were confirmed by weather authorities.
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.
The tornado outbreak sequence of May 5–10, 2015 was a six-day outbreak of tornado activity that affected the Great Plains of the United States in early May 2015. On May 6, strong tornadoes impacted the Oklahoma City area, along with rural parts of Kansas, Texas, Arkansas, South Dakota, and Nebraska. The outbreak coincided with major flooding, with large amounts of rain falling in parts of Nebraska, Kansas, Oklahoma, and Texas. The National Weather Service forecast office in Norman, Oklahoma issued a "flash flood emergency" for Oklahoma City following record-breaking rainfall that occurred in the area that evening. The outbreak sequence resulted in five tornado-related deaths, along with two flood-related deaths. A total of 127 tornadoes were confirmed and rated as a result of this outbreak sequence. Damage from the outbreak was estimated at $1.5 billion.
Preceded by more than a week of heavy rain, a slow-moving storm system dropped tremendous precipitation across much of Texas and Oklahoma during the nights of May 24–26, 2015, triggering record-breaking floods. Additionally, many areas reported tornado activity and lightning. Particularly hard hit were areas along the Blanco River in Hays County, Texas, where entire blocks of homes were leveled. On the morning of May 26, the National Weather Service issued a flash flood emergency for southwest Harris County and northeast Fort Bend County. The system also produced deadly tornadoes in parts of Mexico, Texas, and Oklahoma. This flood significantly contributed to the wettest month ever for Texas and Oklahoma.
The April 2018 North American storm complex also known as Winter Storm Xanto brought a wide swath of severe and winter weather that affected much of Midwest across to the East Coast of the United States. This particular outbreak led to at least 73 confirmed tornadoes over a three-day period, most of which occurred across Arkansas and Louisiana during the evening hours of April 13. The most significant tornadoes were an EF1 that caused a fatality in Red Chute, Louisiana, early on April 14, an upper-end EF2 tornado that impacted eastern sections of Greensboro, North Carolina on April 15, causing 17 injuries, and a significant EF3 tornado that impacted areas from Lynchburg to Elon, Virginia, causing severe damage and at least 10 injuries.
The tornado outbreak of November 30 – December 2, 2018 was a late-season tornado outbreak that occurred across portions of the West South Central states and Midwestern United States. As a potent shortwave trough moved across the southern portions of the country, it was met with ample moisture return and destabilization, resulting in widespread severe thunderstorms that produced damaging winds, hail, and tornadoes. The event began late on November 30 in Oklahoma, spreading east and resulting in one fatality in Aurora, Missouri. Several tornadic supercells moved across portions of Illinois on December 1, and resulted in 29 confirmed tornadoes. This outbreak was the largest December tornado event on record in Illinois history, surpassing the December 1957 tornado outbreak sequence. The most significant tornado of the event was an EF3 that impacted Taylorville, Illinois, damaging or destroying hundreds of structures and injuring 22 people.
A significant severe weather event impacted the South Central United States between October 20–22, 2019. Forecasters first identified the threat on October 16 as a large upper-level trough was expected to combine with an unstable atmosphere across Texas, Oklahoma, and Arkansas particularly. On the evening of October 20, discrete supercell thunderstorms developed across the Dallas–Fort Worth metroplex, contributing to several tornadoes. One of those tornadoes caused EF3 damage in the Dallas suburbs, becoming the costliest tornado event in Texas history, at $1.55 billion. A later squall line contributed to additional tornadoes and a widespread swath of damaging winds as the system tracked eastward.
A significant late-season tornado outbreak took place on November 4, 2022, across Northeast Texas, southwestern Arkansas, southeastern Oklahoma, and northwestern Louisiana with multiple large, destructive tornadoes occurring over a span of several hours. Major damage was reported in Sulphur Springs, Powderly, Caviness, Paris, Cason, Daingerfield, Athens, New Boston, Texas, and Idabel, Oklahoma, with the latter two communities being placed under tornado emergencies. Two fatalities occurred in Cason, Texas, and Pickens, Oklahoma respectively. Numerous PDS tornado warnings were issued as well. An additional tornado embedded within a narrow, but intense line of showers with damaging winds was also confirmed in Illinois the following morning as the system progressed eastward. Strong winds affected most of the western Great Lakes throughout the day before moving into Canada that evening. Two fatalities and at least 34 injuries were confirmed from tornadoes, and an additional fatality occurred near Stilwell, Oklahoma from drowning.
References
- ↑ Ian Livingston (November 17, 2014). "Here's where tornadoes typically form in November across the United States". U.S. Tornadoes. Retrieved October 29, 2023.
- ↑ "U.S. Tornadoes | National Centers for Environmental Information (NCEI)". www.ncei.noaa.gov. Retrieved November 3, 2024.
- 1 2 3 Various National Weather Service offices (2024). "Damage Assessment Toolkit" (Interactive map and database). DAT. National Oceanic and Atmospheric Administration.
- ↑ National Oceanic and Atmospheric Administration. Storm Events Database (Report). National Centers for Environmental Information. Retrieved November 5, 2024.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 National Weather Service in Norman, Oklahoma. 2024 Oklahoma Tornadoes (Report). National Weather Service. Retrieved November 18, 2024.
- 1 2 3 4 5 National Weather Service in Norman, Oklahoma (November 4, 2024). NWS Damage Survey for 11/3/24 Tornado Event - Update # 1 (Report). National Weather Service. Retrieved November 4, 2024.
- ↑ National Weather Service in Tulsa, Oklahoma (November 3, 2024). NWS Tulsa Damage Survey for 11/3/2024 Tornado Event (Report). National Weather Service. Retrieved November 3, 2024.
- 1 2 3 National Weather Service in Little Rock, Arkansas (November 17, 2024). NWS Damage Survey for 11/03/24 through 11/04/24 Tornado Event (Report). National Weather Service. Retrieved November 18, 2024.
- 1 2 3 4 5 National Weather Service in Tulsa, Oklahoma (November 6, 2024). NWS Tulsa Damage Survey for 11/04/2024 Tornado Event - Update 1 (Report). National Weather Service. Retrieved November 8, 2024.
- 1 2 National Weather Service in Shreveport, Louisiana (November 5, 2024). NWS Damage Survey For 11/4/2024 Tornado Event (Report). National Weather Service. Retrieved November 8, 2024.
- ↑ National Weather Service in Springfield, Missouri (November 5, 2024). NWS Damage Survey for 11/04/2024 Tornado Event - Update #1 (Report). National Weather Service. Retrieved November 5, 2024.
- 1 2 3 National Weather Service in Springfield, Missouri (November 7, 2024). NWS Damage Survey for 11/04/2024 Tornado Event - Update #2 (Report). National Weather Service. Retrieved November 10, 2024.
- 1 2 National Weather Service in St. Louis, Missouri (November 5, 2024). NWS Damage Survey for 11/04/2024 Tornado Event (Report). National Weather Service. Retrieved November 5, 2024.
- ↑ National Weather Service in Lake Charles, Louisiana (November 5, 2024). NWS Damage Survey for 11/05/2024 Tornado Event (Report). National Weather Service. Retrieved November 5, 2024.
- ↑ National Weather Service in Lake Charles, Louisiana (November 5, 2024). NWS Damage Survey for 11/05/24 Tornado Event (Report). National Weather Service. Retrieved November 5, 2024.
- ↑ National Weather Service in Des Moines, Iowa (November 18, 2024). NWS Damage Survey for the 5 November 2024 Tornado Event in Davis County (Report). National Weather Service. Retrieved November 18, 2024.
- ↑ National Weather Service in Grand Rapids, Michigan (November 11, 2024). NWS Damage Survey for 11/10/2024 Tornado Event (Report). National Weather Service. Retrieved November 11, 2024.
- ↑ National Weather Service in Pontiac, Michigan (November 11, 2024). NWS Damage Survey for 11/10/2024 Tornado Event (Report). National Weather Service. Retrieved November 11, 2024.
- ↑ National Weather Service in Portland, Oregon (November 12, 2024). NWS Damage Survey for 11/11/24 Tornado Event at Rockaway Beach (Report). National Weather Service. Retrieved November 12, 2024.
- ↑ National Weather Service in Jackson, Mississippi (November 20, 2024). NWS Damage Survey for 11/19/24 Tornado Event (Report). National Weather Service. Retrieved November 25, 2024.
- ↑ National Weather Service in Pittsburgh, Pennsylvania (November 21, 2024). NWS Damage Survey for 11/20/2024 Lincoln Lemington Belmar Tornado (Report). National Weather Service. Retrieved November 25, 2024.