Alert archive / Alabama / Flash Flood Warnings in 2009

Flash Flood Warning 57, NWS Huntsville, AL

July 13, 20096 counties in Alabama

NWS Huntsville, AL issued this flash flood warning at Jul 13, 2009, 12:46 AM CDT for 6 counties in Alabama. It was in force for 106 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: Jul 13, 2009, 12:46 AM CDT (05:46 UTC)
Expired: Jul 13, 2009, 2:32 AM CDT
In force: 106 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

Counties Cullman County, AL, DeKalb County, AL, Jackson County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 56 km from the middle of the area, began a volume at 05:45 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 00:00Z, 5.8 hours before the alert went out and 150 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 889 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.8

Open this sounding in Storm Lab

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 Jul 13, 12:30 AM CDT, 16 minutes earlier.

Area forecast discussion, Jul 13, 12:30 AM CDT, 16 minutes before

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Hazardous weather outlook, Jul 12, 7:18 PM CDT, 5 hours 28 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
718 PM CDT SUN JUL 12 2009

ALZ001>010-016-TNZ076-096-097-130630-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
718 PM CDT SUN JUL 12 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS
OF SOUTHERN MIDDLE TENNESSEE.

.DAY ONE...TONIGHT...

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE OVER SOUTHERN MIDDLE
TENNESSEE AND NORTHEASTERN ALABAMA THIS EVENING. MOST OF THESE
STORMS WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY
RAINFALL...FREQUENT LIGHTNING...AND GUSTY WINDS TO 40 MPH.

A COOL FRONT WILL MOVE CLOSER TO THE AREA TONIGHT...AS AN UPPER
LEVEL SYSTEM PUSHES IN FROM THE NORTHWEST. THESE FEATURES SHOULD
CAUSE RAPID DEVELOPMENT OF SHOWERS AND THUNDERSTORMS LATE TONIGHT.
THE PRIMARY THREAT WITH THESE STORMS WILL BE GUSTY WINDS...LOCALLY
HEAVY RAINFALL...AND ISOLATED INSTANCES OF FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE INTO MONDAY AS A WEAK
FRONT MOVES ACROSS THE AREA. THE PRIMARY THREAT WILL CONTINUE TO BE
LOCALLY HEAVY RAINFALL...AND THE POTENTIAL FOR LOCALIZED FLASH
FLOODING. HOWEVER...STRONG OR DAMAGING WINDS WILL ALSO BE A THREAT
IN ANY STRONGER THUNDERSTORMS.

SHOWERS AND THUNDERSTORMS THEN RETURN TO THE AREA WEDNESDAY NIGHT
THROUGH FRIDAY AS ANOTHER COLD FRONT MOVES INTO THE REGION.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL IS
POSSIBLE EARLY MONDAY MORNING AND AGAIN MONDAY AFTERNOON.

KDW/SL

In the hours before

Local storm report, Jul 12, 9:52 PM CDT, 2 hours 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
952 PM CDT SUN JUL 12 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0852 PM     TSTM WND DMG     3 E PETERSBURG          35.33N 86.58W
07/12/2009                   LINCOLN            TN   LAW ENFORCEMENT

            911 CENTER REPORTED A TREE DOWN ON PETERSBURG CHESTNUT
            RIDGE RD. TIME ESTIMATED FROM RADAR.

0905 PM     LIGHTNING        11 NNE LYNCHBURG        35.42N 86.26W
07/12/2009                   MOORE              TN   LAW ENFORCEMENT

            TREE DOWN AND ON FIRE ON HWY 41A NEAR THE
            BEDFORD...COFFEE...MOORE COUNTY LINE.

&&

CCROWE

Special weather statement, Jul 12, 11:26 PM CDT, 1 hour 20 minutes before

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Special weather statement, Jul 12, 11:57 PM CDT, 49 minutes before

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Special weather statement, Jul 13, 12:13 AM CDT, 33 minutes before

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Special weather statement, Jul 13, 12:16 AM CDT, 30 minutes before

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Special weather statement, Jul 13, 12:38 AM CDT, 8 minutes before

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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 11:05 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	40 min
Jul 12, 11:26 PM CDT	Flash Flood Warning	HUN	Colbert, Lauderdale, Lawrence, Limestone	3 hr
Jul 12, 11:34 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence	26 min
Jul 13, 12:10 AM CDT	Flash Flood Warning	HUN	Madison, Morgan	3 hr
Jul 13, 12:45 AM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Marshall	30 min
Jul 12, 8:49 PM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lincoln, Moore	41 min

Nearby

Flash Flood Warnings in Alabama, 2009 Every 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.