Alert archive / Alabama / Flash Flood Warnings in 2010

Flash Flood Warning 22, NWS Huntsville, AL

May 28, 2010Limestone County, Madison County, Morgan County, Alabama

NWS Huntsville, AL issued this flash flood warning at May 28, 2010, 3:54 PM CDT for Limestone County, Madison County, Morgan County, Alabama. It was in force for 2 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 28, 2010, 3:54 PM CDT (20:54 UTC)
Expired
May 28, 2010, 6:07 PM CDT
In force
2 hr
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Flood severity
None

Counties Limestone County, AL, Madison County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 71 km from the middle of the area, began a volume at 20:54 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 12:00Z, 8.9 hours before the alert went out and 163 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2010-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 909 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2010-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
909 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
951 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
-28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 May 28, 2:49 PM CDT, 1 hour 5 minutes earlier.

Area forecast discussion, May 28, 2:49 PM CDT, 1 hour 5 minutes before
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Hazardous weather outlook, May 28, 1:15 PM CDT, 2 hours 39 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
115 PM CDT FRI MAY 28 2010

ALZ001>010-016-TNZ076-096-097-290300-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
115 PM CDT FRI MAY 28 2010

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

.DAY ONE...TONIGHT...

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON...AS
AN UPPER LEVEL DISTURBANCE TRACKS INTO THE AREA. ANY OF THE STORMS
COULD BECOME STRONG WITH GUSTY WINDS...SMALL HAIL...AND HEAVY
DOWNPOURS. SOME OF THESE HEAVY DOWNPOURS COULD PRODUCE ISOLATED
INSTANCES OF FLASH FLOODING. SOME OF THESE STORMS COULD BECOME
SEVERE...PRODUCING DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

MAINLY AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS WILL BE
POSSIBLE SATURDAY THROUGH THE HOLIDAY WEEKEND AS HEAT AND HUMIDITY
COMBINE WITH A STALLED UPPER LEVEL DISTURBANCE. THUNDERSTORMS DURING
THIS PERIOD COULD BECOME STRONG WITH GUSTY WINDS...SMALL HAIL...AND
HEAVY DOWNPOURS. ISOLATED SEVERE STORMS ARE ALSO POSSIBLE...WITH
DAMAGING WINDS AS THE MAIN THREAT.

ISOLATED TO SCATTERED THUNDERSTORMS WILL REMAIN POSSIBLE THROUGH
MIDWEEK AS A SUMMER LIKE PATTERN CONTROLS THE FORECAST.

.SPOTTER CALL TO ACTION STATEMENT...

FORMAL ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT
PERSONNEL IS NOT ANTICIPATED AT THIS TIME. HOWEVER...SPOTTERS AND
EMERGENCY MANAGEMENT OFFICIALS SHOULD REMAIN ALERT TO THE POTENTIAL
FOR ISOLATED SEVERE STORMS THIS HOLIDAY WEEKEND.

20

In the hours before

Special weather statement, May 28, 2:47 PM CDT, 1 hour 7 minutes before
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Local storm report, May 28, 2:50 PM CDT, 1 hour 4 minutes before
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Special weather statement, May 28, 3:00 PM CDT, 54 minutes before
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Special weather statement, May 28, 3:44 PM CDT, 10 minutes before
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Local storm report, May 28, 3:46 PM CDT, 8 minutes before
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Local storm report, May 28, 3:51 PM CDT, 3 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 1:01 PM CDTSpecial Weather StatementHUNDeKalb44 min
May 28, 1:19 PM CDTSpecial Weather StatementHUNMadison41 min
May 28, 1:28 PM CDTSevere Thunderstorm WarningHUNMadison32 min
May 28, 1:44 PM CDTSevere Thunderstorm WarningHUNMadison31 min
May 28, 1:49 PM CDTSevere Thunderstorm WarningHUNDeKalb26 min
May 28, 2:01 PM CDTSevere Thunderstorm WarningHUNDeKalb, Marshall29 min
May 28, 2:08 PM CDTSpecial Weather StatementHUNCullman37 min
May 28, 2:14 PM CDTSpecial Weather StatementHUNMadison31 min
May 28, 2:29 PM CDTFlash Flood WarningHUNDeKalb99 min
May 28, 2:47 PM CDTSpecial Weather StatementHUNMadison43 min
May 28, 3:07 PM CDTSevere Thunderstorm WarningHUNJackson, Madison, Marshall38 min
May 28, 3:24 PM CDTSevere Thunderstorm WarningHUNMadison, Morgan36 min
May 28, 3:44 PM CDTSpecial Weather StatementHUNMarshall46 min
May 28, 4:02 PM CDTSpecial Weather StatementHUNMorgan58 min
May 28, 4:05 PM CDTSevere Thunderstorm WarningHUNCullman, Morgan25 min
May 28, 4:07 PM CDTSpecial Weather StatementHUNLimestone53 min
May 28, 4:12 PM CDTSevere Thunderstorm WarningHUNMarshall18 min
May 28, 4:27 PM CDTSevere Thunderstorm WarningHUNCullman33 min
May 28, 4:36 PM CDTSpecial Weather StatementHUNLawrence54 min
May 28, 4:40 PM CDTSpecial Weather StatementHUNDeKalb35 min
May 28, 4:48 PM CDTSpecial Weather StatementHUNLawrence42 min
May 28, 5:01 PM CDTSpecial Weather StatementHUNCullman29 min
May 28, 5:24 PM CDTSevere Thunderstorm WarningHUNFranklin, Lawrence38 min
May 28, 5:54 PM CDTSpecial Weather StatementHUNMarshall36 min
May 28, 6:17 PM CDTSpecial Weather StatementHUNLauderdale43 min
May 28, 6:37 PM CDTSevere Thunderstorm WarningHUNLauderdale23 min
May 28, 1:13 PM CDTSpecial Weather StatementHUNFranklin47 min
May 28, 1:24 PM CDTSevere Thunderstorm WarningHUNFranklin36 min
May 28, 1:57 PM CDTFlash Flood WarningHUNFranklin106 min
May 28, 2:19 PM CDTSpecial Weather StatementHUNFranklin26 min
May 28, 3:00 PM CDTSpecial Weather StatementHUNMoore30 min

Nearby

Flash Flood Warnings in Alabama, 2010Every flash flood warning in 2010

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.