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2011 April 25-28, tornado outbreak
EF5 April 27 Alabama Tornado.png
Alabama EF5 Tornado
Date of tornado outbreak: April 25 - 27, 2011
Duration1: 3 days, 7 hours, 18 minutes
Maximum rated tornado2: EF7 tornado
Tornadoes caused: 825
Damages: $571billion (2011 USD)
Fatalities: 1467
Areas affected: Mid United States and Canada

1Time from first tornado to last tornado
2Most severe tornado damage; see wikipedia:Enhanced Fujita Scale

The purpose of this arcticle is to explore what could have happened if the April 27th conditions were available throughout the whole of the severe weather outbreak.

Confirmed
Total
Confirmed
EF0
Confirmed
EF1
Confirmed
EF2
Confirmed
EF3
Confirmed
EF4
Confirmed
EF5
Confirmed
EF6
Confirmed
EF7
Confirmed
EF8
825 380 245 76 36 67 21 7 2 0


Synopsis

The outbreak was caused by a vigorous upper-level trough that moved into the Southern Plains states on April 25. An extratropical cyclone developed ahead of this upper-level trough between northeastern Oklahoma and western Missouri, which moved northeast. Conditions were similar on April 26, with a predicted likelihood of severe thunderstorms, including an extended threat of strong to violent long-track tornadoes during the afternoon and evening hours; mixed-layer CAPE values were forecast to be around 3000–4000 J/kg, around east Texas, Louisiana and Arkansas. The storm mode on April 26 was predicted to consist of mostly discrete supercells during the afternoon and early evening, shifting over to a mesoscale convective complex, with more of a threat of damaging winds and hail during the nighttime hours. Over the following days, conditions got far worse, and 825 tornadoes touched down within the United States and Canada. As the outbreak progressed, the tornadoes became stronger, and more violent. Not only was the first EF6 tornado ever documented, but so was an EF7, which leveled a police station, killing 72 inmates and 5 staff.

Notable tornadoes

Asides from the EF7 (see above), an EF5 demolished a shopping center, killing 256, which also caused $23billion in damages. Another tornado was responsible for a petrol station exploding, causing the tornado to become flame infested.

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