Derecho & Tornadoes - May 3, 2009


Event Summary for Central Alabama

A derecho moved across Central Alabama on Sunday afternoon. A derecho is a widespread and long-lived straight line wind storm associated with a fast moving squall line. A derecho can produce a long-lived gust front which causes straight line wind damage with winds over 58 mph. The derecho on Sunday produced damage in several counties from the Mississippi state line to the Georgia state line.

In addition to the derecho, a few supercell thunderstorms developed just ahead of the squall line. Supercell storms are persistently rotating thunderstorms that produce all types of severe weather. A few tornadoes developed within these supercells.

Our thoughts will be with all those whose lives were impacted by these storms.

 

Location/Clickable Detailed Summary Link
Damage Rating/Estimated Maximum Wind Speeds
Injuries/Fatalities
Damage Path Length/Width
Starting Point/Time
Ending Point/Time
EF-1
90-95 mph
None
0.05 miles
50 yards
32.5614/-87.5510
132 pm
32.5614/-87.5510
132 pm
EF-0
75-85 mph
None
2.61 miles
200 yards
33.4372/-86.6758
154 pm
33.4510/-86.6338
157 pm
EF-1
90-100 mph
None
1.43 miles
300 yards
33.4913/-86.5707
203 pm
33.4992/-86.5477
205 pm
EF-1
90 mph
None
1.00 miles
100 yards
33.5415/-86.4590
215 pm
33.5458/-86.4430
216 pm
EF-1
90-100 mph
None
16.58 miles
800 yards
33.5215/-86.4101
227 pm
33.6651/-86.1795
247 pm

 

Derecho Event

Preliminary Local Storm Reports
Public Information Statement

 

Severe Thunderstorm Watch 233 was in effect from 1135 am CDT until 500 pm CDT.


Severe Weather Episode Data

 

surface analysis
Surface Analysis
May 3rd 7 am
500 mb analysis
500 mb Chart
May 3rd 7 am
day2
Day 2 Severe Weather Outlook
Issued May 2nd
day2
Day 2 Probabilistic Outlook
Issued May 2nd
5/3
Day 1 Severe Weather Outlook
Issued May 3rd
5/3
Day 1 ProbabilisticOutlook
Issued May 3rd
5/3
Severe Weather Reports
May 3rd
5/3
12z BMX Raob
Courtesy of University of Wyoming
5/3
00z BMX Raob
Courtesy of University of Wyoming

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