Alert archive / Alabama / Flash Flood Warnings in 2010

Flash Flood Warning 42, NWS Huntsville, AL

July 26, 2010DeKalb County, Alabama

NWS Huntsville, AL issued this flash flood warning at Jul 26, 2010, 4:11 PM CDT for DeKalb County, Alabama. It was in force for 118 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 26, 2010, 4:11 PM CDT (21:11 UTC)
Expired
Jul 26, 2010, 6:09 PM CDT
In force
118 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Flood severity
None

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 58 km from the middle of the area, began a volume at 21:11 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.2 hours before the alert went out and 171 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, Peachtre/Fal Fld, GA at 12:00Z on 2010-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1811 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, Peachtre/Fal Fld, GA at 12:00Z on 2010-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 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
1811 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
938 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
-3 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 Jul 26, 3:37 PM CDT, 34 minutes earlier.

Area forecast discussion, Jul 26, 3:37 PM CDT, 34 minutes before
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Hazardous weather outlook, Jul 26, 11:56 AM CDT, 4 hours 15 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1156 AM CDT MON JUL 26 2010

ALZ001>010-016-TNZ076-096-097-270200-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
1156 AM CDT MON JUL 26 2010

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

.DAY ONE...TODAY AND TONIGHT...

SCATTERED STRONG THUNDERSTORMS WILL DEVELOP TODAY THROUGH THIS
EVENING.  THE PRIMARY THREATS WILL BE SUDDEN FREQUENT LIGHTNING AND
HEAVY RAIN.  LOCALIZED FLASH FLOODING IS POSSIBLE...ESPECIALLY WITH
SLOW MOVING STORMS.  A FEW STORMS WILL BE CAPABLE OF PRODUCING BRIEF
GUSTY WINDS OF 40 MPH OR HIGHER.

OUTSIDE OF THE STORMS...HOT AND HUMID CONDITIONS WILL PREVAIL THIS
AFTERNOON. DAYTIME TEMPERATURES ARE FORECAST TO BE IN THE LOW TO
MID 90S WITH HEAT INDEX READINGS APPROACHING 105 DEGREES.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

ISOLATED TO SCATTERED...MAINLY AFTERNOON AND EVENING...
THUNDERSTORMS CAN BE EXPECTED EACH DAY. PRIMARY THREATS WITH
STRONGER STORMS WILL BE LOCALLY HEAVY RAIN AND BRIEF GUSTY WINDS.

OUTSIDE OF THE STORMS...HOT AND HUMID CONDITIONS WILL PREVAIL
THROUGH THE WEEKEND. BEYOND TUESDAY...DAYTIME TEMPERATURES ARE
FORECAST TO BE IN THE MID TO UPPER 90S WITH HEAT INDEX READINGS
APPROACHING 105 DEGREES.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL IS
POSSIBLE ON AN AS NEEDED BASIS.

KULA

In the hours before

Special weather statement, Jul 26, 2:49 PM CDT, 1 hour 22 minutes before
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Special weather statement, Jul 26, 2:56 PM CDT, 1 hour 15 minutes before
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Special weather statement, Jul 26, 3:07 PM CDT, 1 hour 4 minutes before
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Special weather statement, Jul 26, 3:32 PM CDT, 39 minutes before
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Local storm report, Jul 26, 4:09 PM CDT, 2 minutes before
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Special weather statement, Jul 26, 4:09 PM CDT, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 9:20 PM CDTSpecial Weather StatementHUNCullman40 min
Jul 25, 9:42 PM CDTFlash Flood WarningHUNCullman2 hr
Jul 26, 11:47 AM CDTSpecial Weather StatementHUNJackson43 min
Jul 26, 12:26 PM CDTHeat AdvisoryHUNColbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more6 hr
Jul 26, 12:35 PM CDTSpecial Weather StatementHUNJackson25 min
Jul 26, 1:56 PM CDTSevere Thunderstorm WarningHUNMadison19 min
Jul 26, 2:02 PM CDTSpecial Weather StatementHUNLimestone43 min
Jul 26, 2:13 PM CDTSevere Thunderstorm WarningHUNJackson26 min
Jul 26, 2:37 PM CDTSpecial Weather StatementHUNLimestone, Madison38 min
Jul 26, 2:49 PM CDTSpecial Weather StatementHUNDeKalb26 min
Jul 26, 2:56 PM CDTSpecial Weather StatementHUNMadison34 min
Jul 26, 3:07 PM CDTSpecial Weather StatementHUNDeKalb23 min
Jul 26, 3:14 PM CDTSevere Thunderstorm WarningHUNDeKalb46 min
Jul 26, 3:21 PM CDTSevere Thunderstorm WarningHUNDeKalb39 min
Jul 26, 3:32 PM CDTSpecial Weather StatementHUNJackson28 min
Jul 26, 3:51 PM CDTSevere Thunderstorm WarningHUNJackson, Marshall24 min
Jul 26, 4:09 PM CDTSpecial Weather StatementHUNJackson51 min
Jul 26, 4:16 PM CDTSevere Thunderstorm WarningHUNDeKalb36 min
Jul 26, 4:22 PM CDTSpecial Weather StatementHUNMarshall23 min
Jul 26, 4:46 PM CDTSpecial Weather StatementHUNMarshall44 min
Jul 26, 5:09 PM CDTFlash Flood WarningHUNCullman62 min
Jul 26, 5:33 PM CDTSpecial Weather StatementHUNFranklin27 min
Jul 26, 5:59 PM CDTSpecial Weather StatementHUNColbert46 min
Jul 26, 6:44 PM CDTSevere Thunderstorm WarningHUNFranklin31 min
Jul 26, 12:04 PM CDTSpecial Weather StatementHUNLincoln26 min
Jul 26, 12:15 PM CDTSpecial Weather StatementHUNFranklin30 min
Jul 26, 12:32 PM CDTSpecial Weather StatementHUNLincoln43 min
Jul 26, 1:01 PM CDTSevere Thunderstorm WarningHUNMoore44 min
Jul 26, 1:12 PM CDTFlash Flood WarningHUNMoore78 min
Jul 26, 1:18 PM CDTSpecial Weather StatementHUNLincoln27 min
Jul 26, 1:35 PM CDTSpecial Weather StatementHUNLincoln25 min
Jul 26, 1:36 PM CDTFlash Flood WarningHUNLincoln3 hr
Jul 26, 2:00 PM CDTSpecial Weather StatementHUNLincoln45 min
Jul 26, 6:29 PM CDTSpecial Weather StatementHUNHardin31 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.