Event Overview Surface & Upper Air Charts
Storm Surveys
Severe Weather Outlooks

GIS Data

 

 


Event Overview

A large scale severe weather event began Saturday April 26 and ended Tuesday April 29th. This system produced several waves of severe weather. Strong and violent tornadoes, very large hail, flash flooding, and damaging straight line winds accompanied this dynamic storm system. This severe weather started in the Central and Southern Plains and moved eastward into the Midwest and Lower Mississippi Valley on April 27th. The most tornadoes occurred across the Deep South as the system moved into Mississippi and Alabama on April 28th. The event finally subsided on April 29th, but not before producing significant flooding and tornadoes along the Gulf Coast, tornadoes in the Carolinas, and severe weather into the Ohio Valley and Great Lakes. The was the largest tornado outbreak in Central Alabama since the infamous weather back in April 2011.

Thunderstorms development needs the proper combination of moisture, instability and lift. If these values are combined with high enough values, severe thunderstorms can develop. Then we add wind shear, which is the directional turning of the winds with height, and tornadoes are possible. Conditions over central Alabama on Monday April 28th had the perfect mixture of these ingredients to produce tornadoes, some of which were strong.

Supercell thunderstorms developed during the late Monday afternoon over eastern Mississippi and northwest Alabama. This activity developed well ahead of a cold front in the warm sector. The activity slowly proceded east and southeast and the threat ended early Tuesday morning.

Surface & Upper Air Charts

7 PM April 27th

250mb Chart at 00Z April 28th

250mb Chart

300mb Chart at 00Z April 28th

300mb Chart

500mb Chart at 00Z April 28th

500mb Chart

700mb Chart at 00Z April 28th

700mb Chart

850 mb at 00Z April 28th

850mb Chart

925 mb at 00Z April 28th

925mb Chart

Surface Chart 00z April 28th

Surface Analysis

 

7 AM April 28th

250mb Chart at 12Z April 28th

250mb Chart

300mb Chart at 12Z April 28th

300mb Chart

500mb Chart at 12Z April 28th

500mb Chart

700mb Chart at 12Z April 28th

700mb Chart

850 mb at 12Z April 28th

850mb Chart

925 mb at 12Z April 28th

925mb Chart

Surface Chart 12z April 28th

Surface Analysis

 

7 PM April 28th

250mb Chart at 00Z April 29th

250mb Chart

300mb Chart at 00Z April 29th

300mb Chart

500mb Chart at 00Z April 29th

500mb Chart

700mb Chart at 00Z April 29th

700mb Chart

850 mb at 00Z April 29th

850mb Chart

925 mb at 00Z April 29th

925mb Chart

Surface Chart 00z April 29th

Surface Analysis

 

7 AM April 29th

250mb Chart at 12Z April 29th

250mb Chart

300mb Chart at 12Z April 29th

300mb Chart

500mb Chart at 12Z April 29th

500mb Chart

700mb Chart at 12Z April 29th

700mb Chart

850 mb at 12Z April 29th

850mb Chart

925 mb at 12Z April 29th

925mb Chart

Surface Chart 12z April 29th

Surface Analysis

 

Upper Air Soundings

Soundings

BMX Sounding 04/28 00z

Soundings

BMX Sounding 04/28 12z

Soundings

BMX Sounding 04/28 18z

Soundings

BMX Sounding 04/29 00z

Soundings

FFC Sounding 04/29 00z

Soundings

JAN Sounding 04/28 00z

Soundings

JAN Sounding 04/28 12z

Soundings

JAN Sounding 04/28 18z

Soundings

LIX Sounding 04/28 00z

Soundings

LIX Sounding 04/28 12z

Soundings

Redstone Arsenal Sounding 04/28 12z

 

Alabama Rainfall Plot

Rainfall Plot

April 27-28

Rainfall Plot

April 28-29

Rainfall Plot

April 29-30

Severe Weather Outlooks

SPC Day 4-8 Outlook

Day4-8 Outlook

Issued April 22nd

Day 4-8 Outlook

Issued April 23rd

Day 4-8 Outlook

Issued April 24th

Day 4-8 Outlook

Issued 25th

Day 4-8 Outlook

Issued April 26th

 

Day 3 and Day 2 Outlooks

Day 3 Outlook

Day3 Outlook Issued April 26

Day 3 Probabilistic

Day3 Probabilistic Issued April 26

Day 2 Outlook

Day2 Outlook Issued April 27

Day 2 Probabilistic

Day2 Probabilistic Issued April 27

Day 2 Outlook Update

Day2 Outlook Update Issued April 27

Day 2 Outlook Probabilistic Update

Day2 Outlook Probabilistic Update Issued April 27

 

Day 1 Outlooks

Day 1 Outlook

Day 1 Outlook Issued 1 AM

Day 1 Outlook

Day 1 Tornado Issued 1 AM

Day 1

Day 1 Wind Issued 1 AM

Day 1 Outlook

Day 1 Hail Issued 1 AM

Day 1 Outlook

Day 1 Outlook Issued 8 AM

Day 1 Outlook

Day 1 Tornado Issued 8 AM

Day 1 Outlook

Day 1 Wind Issued 8 AM

Day 1 Outlook

Day 1 Hail Issued 8 AM

Day 1 Outlook

Day 1 Outlook Issued Noon

Day 1 Outlook

Day 1 Tornado Issued Noon

Day 1 Outlook

Day 1 Wind Issued Noon

Day 1 Outlook

Day 1 Hail Issued Noon

Day 1 Outlook

Day 1 Outlook Issued 2 PM

Day 1 Outlook

Day 1 Tornado Issued 2 PM

Day 1 Outlook

Day 1 Wind Issued 2 PM

Day 1 Outlook

Day 1 Hail Issued 2 PM

Day 1 Outlook

Day 1 Outlook Issued 7 PM

Day 1 Outlook

Day 1 Tornado Issued 7 PM

Day 1 Outlook

Day 1 Wind Issued 7 PM

Day 1 Outlook

Day 1 Hail Issued 7 PM

 

Storm Reports

Storm Reports

April 26th Storm Reports

Storm Reports

April 27th Storm Reports

Storm Reports

April 28th Storm Reports

Storm Reports

April 29th Storm Reports

 

 

 

 


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