Tornado outbreak of April 27–30, 2014

Last updated

April 27, 2014 High Risk.gif
High risk convective outlook issued by the Storm Prediction Center at 20:00 UTC on April 27
April 28, 2014 High risk.gif
High risk convective outlook issued by the Storm Prediction Center at 19:19 UTC on April 28

The Storm Prediction Center (SPC) indicated the potential for a large-scale tornado outbreak for six days in advance on its 4–8 day outlook, beginning early on April 19 valid at day 5. [8] While models diverged on the exact nature and intensity of the expected mid-level shortwave trough, there was broad support for a dry line to develop in central Oklahoma. By April 22, the Storm Prediction Center expanded the threat zone for day 6 for the remainder of Oklahoma and the Central High Plains region, with strong upper-level winds to spread over the central High Plains. [9] Three days later, a Day 3 moderate risk was issued early on April 25 for the Ark-La-Tex region, citing the increased risk for a severe weather outbreak, with the risk of trailing supercells. [10]

April 27

The strong mid-level shortwave trough developed into a closed low-pressure area as the system occluded over the central High Plains on April 27, 2014. An associated surface cyclone reached peak intensity while a trailing cold front moved eastward across eastern Kansas, eastern Oklahoma and northern Texas. There were two areas where severe weather was expected: morning pre-frontal convection from Kansas and Oklahoma into Missouri and Iowa and warm sector supercell development across southeast Oklahoma and northeast Texas into Arkansas. [11] By 20:00 UTC on April 27, the SPC issued a rare high risk for much of central Arkansas and a 30% hatched risk for tornadoes across the same corridor, citing the anticipation of numerous supercells capable of producing intense tornadoes. [11] Expected thermodynamic conditions of storm-relative helicity values in of 300–400 m2s−2, convective available potential energy (CAPE) values of 2,500–3,000 J/kg−1, a 40–50 kn low level jet and boundary-layer dewpoints of 57 to 61 °F (14 to 16 °C) were expected to foster supercell development and strong to intense tornadoes across Arkansas, along with very large hail. [11] A particularly dangerous situation (PDS) tornado watch was issued at that time for central Arkansas. [12]

Points of the confirmed tornadoes from the April 27-30, 2014 April 27-30, 2014 tornado outbreak map.png
Points of the confirmed tornadoes from the April 27–30, 2014

As the evening progressed, multiple intense tornadoes touched down across parts of the Midwest, Ozarks, and Great Plains. A strong EF2 tornado struck Quapaw, Oklahoma and Baxter Springs, Kansas, resulting in one fatality, 37 injuries, and severe damage in both towns. An EF1 tornado destroyed multiple outbuildings, killing two people as it passed near Martinsburg, Iowa. A large, violent wedge tornado struck Mayflower and Vilonia, Arkansas later that evening, causing catastrophic damage and killing 16 people as numerous homes and businesses were obliterated, some of which were swept completely away. Trees were completely denuded and debarked, vehicles were thrown and mangled beyond recognition by the tornado, which was rated a high-end EF4, the first violent tornado of the year. [13] [14]

April 28

Once again on the afternoon April 28, a high risk was issued for a corridor for northern Mississippi and northwestern Alabama, as semi-discrete supercells began developing across Mississippi. [15] Another particularly dangerous situation (PDS) tornado watch was issued for Mississippi as well. [16] Destructive tornadoes continued to touch down later that evening, and 10 people were killed when an EF4 tornado struck Louisville, Mississippi, where many structures were completely destroyed, some of which were leveled or swept away by the tornado. An EF3 tornado caused one fatality and major damage to many structures in Tupelo, Mississippi as well, and another EF3 struck Coxey, Alabama, destroying a mobile home park and killing two people. Numerous other strong tornadoes occurred in rural areas of the Deep South later that night and into the early morning hours of April 29. [5]

April 29–30

Additional weak tornadoes touched down in The Carolinas and Florida on April 29 and 30 before the outbreak came to an end. 82 tornadoes were confirmed as a result of this outbreak, which resulted in 35 fatalities. [17] In addition to the tornado outbreak, a lone EF0 tornado occurred in Pierce County, Washington on April 27, causing minor damage. [18]

Confirmed tornadoes

Tornado outbreak of April 27–30, 2014
April 27 2014 tornado outbreak 2345z.png
GOES 13 image of the storm complex and associated supercells at 2345 UTC on April 27
Confirmed tornadoes by Enhanced Fujita rating
EFUEF0EF1EF2EF3EF4EF5Total
018371692082

A total of 82 tornadoes over a period of four days were confirmed. Collectively, they resulted in 35 fatalities and 447 injuries. [3]

Quapaw, Oklahoma/Baxter Springs, Kansas

34 mi (1.2 km) away from where it originated. [26] [28] Nine people were killed in the town. [25] [29] As it moved out of downtown Vilonia, it tore directly through the Parkwood Meadows subdivision at the northeast side of town. Entire rows of homes were reduced to bare slabs at this location, though it was revealed that the vast majority of the homes were nailed rather than bolted to their foundations, preventing an EF5 rating. [25]

Continuing past Vilonia, the tornado weakened to EF3 strength as it passed just south of Williams Lake. A large metal arena building and a mobile home were destroyed in that area, with a few other structures sustaining EF1 damage nearby. Shortly after 8:00 p.m. (0100 UTC) the storm moved through densely forested areas and into White County, just west of El Paso. The tornado briefly regained EF2 status and destroyed two manufactured homes. [25] One person was killed in one of the manufactured homes at this location. [29] It soon dissipated at 8:02 p.m. (0106 UTC) roughly 1 mile (1.6 km) north-northeast of El Paso near a forested area. [25]

Overall, the tornado remained on the ground for an hour, from 7:06 p.m. to 8:02 p.m. (0006 – 0102 UTC), and traveled along a 41.3 miles (66.5 km) path. Sixteen people lost their lives due to the tornado while 193 others were injured. [32] The 16 fatalities made this the deadliest in Arkansas since an F4 tornado killed 35 on May 15, 1968.

Louisville, Mississippi

Quapaw, Oklahoma/Baxter Springs, Kansas

References

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Notes

  1. Flooding continued into May 1.
Noxapater–Louisville, Mississippi