Alert archive / Alabama / Flash Flood Warnings in 2009
Flash Flood Warning 18, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at May 2, 2009, 8:07 AM CDT for 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
- May 2, 2009, 8:07 AM CDT (13:07 UTC)
- Expired
- May 2, 2009, 11:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Lauderdale County, AL
The radar
The Columbus AFB radar (KGWX), 128 km from the middle of the area, began a volume at 13:07 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
Birmingham, AL (KBMX), launched 12:00Z, 1.1 hours before the alert went out and 208 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
- 830 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.3
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 May 2, 6:20 AM CDT, 1 hour 47 minutes earlier.
Area forecast discussion, May 2, 6:20 AM CDT, 1 hour 47 minutes before
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</html>Hazardous weather outlook, May 2, 4:00 AM CDT, 4 hours 7 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HUNTSVILLE AL 400 AM CDT SAT MAY 2 2009 ALZ001>010-016-TNZ076-096-097-021800- LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN- MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN- 400 AM CDT SAT MAY 2 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS OF SOUTHERN MIDDLE TENNESSEE. ...A FLASH FLOOD WATCH IS IN EFFECT FROM 7 AM THROUGH LATE TONIGHT... .DAY ONE...TODAY AND TONIGHT... NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP TODAY AND PERSIST INTO THE EVENING HOURS AS A STRONG UPPER LEVEL DISTURBANCE MOVES EASTWARD ACROSS THE OUTLOOK AREA. THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAINFALL IN A SHORT PERIOD OF TIME TRANSLATING INTO POSSIBLE FLASH FLOODING...ESPECIALLY ON ROADWAYS AND IN LOW LYING AREAS. IN ADDITION TO THE FLOODING THREAT...A FEW THUNDERSTORMS MAY APPROACH SEVERE THRESHOLDS WITH THE POTENTIAL FOR STRONG WIND GUSTS APPROACHING 60 MPH. THE THUNDERSTORM THREAT IS EXPECTED TO DIMINISH SOME WITH THE ONSET OF THE OVERNIGHT HOURS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... SHOWERS AND THUNDERSTORMS ARE EXPECTED TO BECOME MORE WIDESPREAD ON SUNDAY AS ANOTHER STRONG UPPER LEVEL DISTURBANCE APPROACHES THE OUTLOOK AREA FROM THE WEST. THE STRONGER STORMS ONCE AGAIN WILL BE CAPABLE OF PRODUCING VERY HEAVY RAINFALL IN A SHORT PERIOD OF TIME RESULTING IN POSSIBLE FLASH FLOODING. IN ADDITION TO THE FLOODING THREAT...SOME STORMS WILL BE CAPABLE OF REACHING SEVERE THRESHOLDS WITH THE POTENTIAL FOR DAMAGING WIND GUSTS AND HAIL. AN ISOLATED TORNADO CAN NOT BE RULED OUT AS WELL. THE THREAT FOR SEVERE WEATHER IS EXPECTED TO LAST FROM SUNDAY AFTERNOON THROUGH EARLY MONDAY BEFORE A WEAK COLD FRONT MOVES EASTWARD ACROSS THE OUTLOOK AREA LATER MONDAY MORNING. THE THUNDERSTORM THREAT IS THEN EXPECTED TO END MONDAY NIGHT. SCATTERED SHOWERS AND THUNDERSTORMS ARE ONCE AGAIN POSSIBLE WEDNESDAY THROUGH FRIDAY AS ANOTHER SERIES OF UPPER LEVEL DISTURBANCES BEGIN TO MOVE EASTWARD ACROSS THE AREA. .SPOTTER CALL TO ACTION STATEMENT... ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL MAY BE REQUESTED LATER TODAY TO ASSIST IN SEVERE WEATHER/FLASH FLOODING OPERATIONS. IN ADDITION...FIRST RESPONSE AGENCIES ARE ENCOURAGED TO MONITOR THE LATEST WEATHER REPORTS AND UPDATES.
In the hours before
Special weather statement, May 2, 7:16 AM CDT, 51 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HUNTSVILLE AL 716 AM CDT SAT MAY 2 2009 TNZ096-097-021315- FRANKLIN-LINCOLN- 716 AM CDT SAT MAY 2 2009 ...SIGNIFICANT WEATHER ALERT FOR FRANKLIN AND LINCOLN COUNTIES UNTIL 815 AM CDT... AT 714 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR COWAN AND WINCHESTER...MOVING EAST AT 35 MPH. WINDS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. * LOCATIONS IN OR NEAR THE PATH INCLUDE... COWAN...WOODS RESERVOIR. ALTO...SHERWOOD. SEWANEE...ST. ANDREWS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY. STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS CONCERNING THIS WEATHER SITUATION.
The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 7:03 PM CDT | Severe Thunderstorm Warning | HUN | Cullman | 29 min |
| May 1, 7:16 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale, Lawrence | 13 min |
| May 1, 7:37 PM CDT | Severe Thunderstorm Warning | HUN | Lawrence, Morgan | 38 min |
| May 1, 8:42 PM CDT | Severe Thunderstorm Warning | HUN | Morgan | 31 min |
| May 1, 9:38 PM CDT | Flash Flood Warning | HUN | Colbert, Cullman, Franklin, Lawrence, Morgan | 3 hr |
| May 1, 10:50 PM CDT | Areal Flood Warning | HUN | Colbert, Lauderdale, Lawrence, Limestone, Morgan | 3 hr |
| May 1, 11:38 PM CDT | Areal Flood Warning | HUN | Jackson, Madison, Marshall, Morgan | 3 hr |
| May 2, 12:38 AM CDT | Flash Flood Watch | HUN | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 10 hr |
| May 2, 9:21 AM CDT | River Flood Warning | HUN | Madison | 70 hr |
| May 2, 9:40 AM CDT | River Flood Warning | HUN | Jackson, Madison, Marshall | 5 days |
| May 2, 10:12 AM CDT | Flood Watch | HUN | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 39 hr |
| May 2, 10:40 AM CDT | Flash Flood Warning | HUN | DeKalb, Jackson | 2 hr |
| May 2, 10:52 AM CDT | River Flood Warning | HUN | Lawrence | 47 hr |
| May 2, 11:22 AM CDT | Areal Flood Warning | HUN | Lauderdale | 4 hr |
| May 2, 2:38 PM CDT | Tornado Warning | HUN | Franklin | 37 min |
| May 2, 3:17 PM CDT | Flash Flood Warning | HUN | Colbert, Franklin, Lauderdale, Lawrence, Limestone, Morgan | 3 hr |
| May 2, 4:48 PM CDT | Tornado Warning | HUN | Madison, Morgan | 27 min |
| May 2, 5:32 PM CDT | Areal Flood Warning | HUN | Madison | 52 min |
| May 2, 6:14 PM CDT | Areal Flood Warning | HUN | Lauderdale | 6 hr |
| May 1, 7:16 PM CDT | Flash Flood Warning | HUN | Franklin, Lincoln, Moore | 3 hr |
Nearby
Flash Flood Warnings in Alabama, 2009Every flash flood 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.