Alert archive / Alabama / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 33, NWS Huntsville, AL
NWS Huntsville, AL issued this severe thunderstorm warning at Apr 11, 2007, 5:07 PM CDT for DeKalb County, Alabama. It was in force for 18 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 11, 2007, 5:07 PM CDT (22:07 UTC)
- Expired
- Apr 11, 2007, 5:25 PM CDT
- In force
- 18 min
- Issued by
- NWS Huntsville, AL
- Area
- Counties, with a storm outline in the text
County DeKalb County, AL
The radar
The Northeast Alabama radar (KHTX), 58 km from the middle of the area, began a volume at 22:08 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 11, 1:42 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 10.1 hours before the alert went out and 168 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 501 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 342 m²/s²
- 0-3 km storm-relative helicity
- 389 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Huntsville, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 11, 3:25 PM CDT, 1 hour 42 minutes earlier.
Area forecast discussion, Apr 11, 3:25 PM CDT, 1 hour 42 minutes before
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</html>Hazardous weather outlook, Apr 11, 12:15 PM CDT, 4 hours 52 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HUNTSVILLE AL 1215 PM CDT WED APR 11 2007 ALZ001>010-016-TNZ076-096-097-121100- LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN- MARSHALL-JACKSON-DE KALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN- 1215 PM CDT WED APR 11 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS OF SOUTHERN MIDDLE TENNESSEE. .DAY ONE...THIS AFTERNOON AND TONIGHT... A LINE OF SHOWERS AND THUNDERSTORMS OVER NORTHERN MISSISSIPPI WILL MOVE ACROSS THE TENNESSEE VALLEY THIS AFTERNOON. SOME OF THOSE STORMS COULD BECOME STRONG TO SEVERE. THE MAIN RISKS FROM STORMS THAT BECOME SEVERE INCLUDE WIND GUSTS TO 60 MPH AND NICKEL SIZED HAIL. THE LINE OF THUNDERSTORMS SHOULD REACH FAR NORTHWEST ALABAMA BY 1230 PM...THE MUSCLE SHOALS AREA BETWEEN 1 TO 2 PM...THE I-65 CORRIDOR AROUND 3 PM...AND THE NORTHEAST AREAS AROUND 5 PM. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY... A STRONGER STORM SYSTEM WILL BRING ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS TO THE AREA FROM FRIDAY NIGHT INTO SATURDAY. SOME OF THESE STORMS MAY BECOME STRONG TO SEVERE. .SPOTTER CALL TO ACTION STATEMENT... ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL IS POSSIBLE BUT UNLIKELY AT THIS TIME. RSB
In the hours before
Special weather statement, Apr 11, 2:12 PM CDT, 2 hours 55 minutes before
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</html>Special weather statement, Apr 11, 2:48 PM CDT, 2 hours 19 minutes before
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</html>Special weather statement, Apr 11, 3:27 PM CDT, 1 hour 40 minutes before
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</html>Special weather statement, Apr 11, 4:24 PM CDT, 43 minutes before
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</html>Special weather statement, Apr 11, 4:48 PM CDT, 19 minutes before
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</html>The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 2:26 PM CDT | Severe Thunderstorm Warning | HUN | Lawrence | 34 min |
| Apr 11, 3:40 PM CDT | Severe Thunderstorm Warning | HUN | Jackson, Madison, Marshall | 35 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 2007Every severe thunderstorm warning in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.