Alert archive / Alabama / Flash Flood Warnings in 2011
Flash Flood Warning 58, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at Sep 4, 2011, 7:55 PM CDT for Colbert County, Lauderdale County, Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 4, 2011, 7:55 PM CDT (00:55 UTC)
- Expired
- Sep 4, 2011, 11:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Colbert County, AL, Lauderdale County, AL
The radar
The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 00:57 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 nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 0.9 hours before the alert went out and 180 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
- 502 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 593 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood 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 flash flood warning went out at Sep 4, 5:46 PM CDT, 2 hours 9 minutes earlier.
Area forecast discussion, Sep 4, 5:46 PM CDT, 2 hours 9 minutes before
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</html>Hazardous weather outlook, Sep 4, 2:55 PM CDT, 5 hours before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HUNTSVILLE AL 255 PM CDT SUN SEP 4 2011 ALZ001>010-016-TNZ076-096-097-051000- LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN- MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN- 255 PM CDT SUN SEP 4 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS OF SOUTHERN MIDDLE TENNESSEE. .DAY ONE...TONIGHT... AFTER AN INITIAL ROUND OF LIGHTER RAIN...SHOWERS AND THUNDERSTORMS WILL INCREASE IN INTENSITY THIS EVENING HOURS. HIGH RAINFALL RATES EXPECTED WITH THE STRONGER STORMS MAY QUICKLY PRODUCE LOCALIZED FLOODING. THEREFORE...A FLASH FLOOD WATCH IS IN EFFECT FOR THE ENTIRE TENNESSEE VALLEY STARTING THIS EVENING. PLEASE CONSULT THE FLASH FLOOD WATCH FOR ADDITIONAL DETAILS. WHILE AN ISOLATED TORNADO CANNOT BE RULED OUT AS RAIN BANDS MOVE ACROSS THE TENNESSEE VALLEY THIS EVENING...THE MAIN THREAT FOR THE AREA WILL REMAIN IN THE FLASH FLOODING POTENTIAL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE REGION INTO THE MIDDLE OF THE WEEK AS TROPICAL STORM LEE TRACKS ACROSS THE SOUTHEAST. HAZARDOUS WEATHER COULD PERSIST INTO EARLY WEDNESDAY. CONTINUED HEAVY RAINFALL WILL PROVIDE THE POTENTIAL FOR SIGNIFICANT FLOODING AND FLASH FLOODING ACROSS THE TENNESSEE VALLEY. WIDESPREAD RAINFALL TOTALS THROUGH TUESDAY ARE EXPECTED TO BE FOUR TO SEVEN INCHES AND LOCALLY HIGHER AMOUNTS WILL BE POSSIBLE. THE FLASH FLOOD WATCH WILL REMAIN IN EFFECT UNTIL EARLY TUESDAY MORNING. AS HEAVY RAINFALL RUNS OFF INTO AREA STREAMS AND RIVERS...RIVER FLOODING WILL BECOME A POSSIBILITY AS EARLY AS MONDAY...WITH IMPACTS POTENTIALLY LINGERING THROUGH THE END OF THE WEEK. .SPOTTER CALL TO ACTION STATEMENT... ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL MAY BE POSSIBLE THIS AFTERNOON THROUGH TUESDAY. CCC/JLL
The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 10:23 PM CDT | Flash Flood Warning | HUN | Colbert, Lauderdale | 10 hr |
| Sep 5, 1:28 AM CDT | Flash Flood Warning | HUN | Colbert, Franklin, Lauderdale | 7 hr |
| Sep 5, 8:30 AM CDT | Flash Flood Warning | HUN | Colbert, Franklin, Lauderdale | 6 hr |
| Sep 5, 9:45 AM CDT | Flash Flood Warning | HUN | Cullman, DeKalb, Jackson, Marshall | 15 hr |
| Sep 5, 10:33 AM CDT | River Flood Watch | HUN | Madison | 8 hr |
| Sep 5, 10:34 AM CDT | River Flood Watch | HUN | Jackson, Madison, Marshall | 10 hr |
| Sep 5, 10:34 AM CDT | River Flood Watch | HUN | Lawrence | 8 hr |
| Sep 5, 2:27 PM CDT | Areal Flood Warning | HUN | Colbert, Franklin, Lauderdale | 10 hr |
Nearby
Flash Flood Warnings in Alabama, 2011Every flash flood warning in 2011
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.