Alert archive / Alabama / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 439, NWS Birmingham, AL
NWS Birmingham, AL issued this severe thunderstorm warning at Oct 9, 2009, 7:19 PM CDT for Autauga County, Alabama. It was in force for 26 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
- Oct 9, 2009, 7:19 PM CDT (00:19 UTC)
- Expired
- Oct 9, 2009, 7:45 PM CDT
- In force
- 26 min
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
County Autauga County, AL
The radar
The Birmingham radar (KBMX), 72 km from the middle of the area, began a volume at 00:19 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 |
|---|---|---|---|
| Oct 9, 5:53 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.3 hours before the alert went out and 220 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
- 1365 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 886 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.3
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 Birmingham, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 9, 6:30 PM CDT, 49 minutes earlier.
Area forecast discussion, Oct 9, 6:30 PM CDT, 49 minutes before
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</html>Hazardous weather outlook, Oct 9, 12:00 PM CDT, 7 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BIRMINGHAM AL 1200 PM CDT FRI OCT 9 2009 ALZ011>015-017>050-101700- MARION-LAMAR-FAYETTE-WINSTON-WALKER-BLOUNT-ETOWAH-CALHOUN- CHEROKEE-CLEBURNE-PICKENS-TUSCALOOSA-JEFFERSON-SHELBY-ST. CLAIR- TALLADEGA-CLAY-RANDOLPH-SUMTER-GREENE-HALE-PERRY-BIBB-CHILTON- COOSA-TALLAPOOSA-CHAMBERS-MARENGO-DALLAS-AUTAUGA-LOWNDES-ELMORE- MONTGOMERY-MACON-BULLOCK-LEE-RUSSELL-PIKE-BARBOUR- 1200 PM CDT FRI OCT 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY THE NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM. .DAY ONE...THIS AFTERNOON AND TONIGHT. A STRONG COLD FRONT WILL BRING A THREAT OF STRONG TO SEVERE THUNDERSTORMS TO CENTRAL ALABAMA LATER THIS AFTERNOON...THROUGH THE EVENING...AND POTENTIALLY INTO THE OVERNIGHT TIME PERIOD. THE THREAT SHOULD ENTER THE NORTHWESTERN COUNTIES BY 2 PM...WITH STORMS CAPABLE OF STRONG DAMAGING WINDS...SMALL HAIL...AND ISOLATED TORNADOES. THERE WILL ALSO BE A THREAT FOR LOCALIZED FLASH FLOODING. AS THE CONVECTIVE LINE PUSHES FURTHER EAST THROUGH THE AFTERNOON...COUNTIES MAINLY ALONG AND WEST OF THE INTERSTATE 65 CORRIDOR WILL BE AFFECTED AFTER 4 PM. THE MAIN THREATS WILL CONTINUE TO BE STRONG DAMAGING WINDS AND SMALL HAIL. AFTER 8PM THE THREAT WILL BEGIN TO SHIFT EASTWARD...MAINLY ALONG AND EAST OF THE INTERSTATE 65 CORRIDOR. SOME STRONG TO POSSIBLY SEVERE WINDS WILL REMAIN THE THREAT THROUGH THE REMAINDER OF THE EVENING AND PERHAPS INTO THE OVERNIGHT TIME PERIOD. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THUNDERSTORM CHANCES WILL REMAIN ON SATURDAY INTO SUNDAY...ALTHOUGH THEY ARE NOT EXPECTED TO BE AS STRONG AS FRIDAY NIGHT. THE MAIN THREATS WILL BE GUSTY WINDS...LOCALLY HEAVY RAINFALL AND LIGHTNING. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT WILL BE NECESSARY THIS AFTERNOON AND THIS EVENING...POSSIBLY INTO THE OVERNIGHT. 17/KLAWS
In the hours before
Local storm report, Oct 9, 6:17 PM CDT, 1 hour 2 minutes before
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</html>Local storm report, Oct 9, 6:22 PM CDT, 57 minutes before
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</html>Local storm report, Oct 9, 6:23 PM CDT, 56 minutes before
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</html>Local storm report, Oct 9, 6:25 PM CDT, 54 minutes before
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</html>Local storm report, Oct 9, 6:26 PM CDT, 53 minutes before
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</html>Local storm report, Oct 9, 6:31 PM CDT, 48 minutes before
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</html>Nearby
Severe Thunderstorm Warnings in Alabama, 2009Every severe thunderstorm warning in 2009
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.