Alert archive / Alabama / Special Weather Statements in 2011

Special Weather Statement, NWS Huntsville, AL

August 11, 2011Cullman County, Alabama

NWS Huntsville, AL issued this special weather statement at Aug 11, 2011, 6:31 PM CDT for Cullman County, Alabama. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 11, 2011, 6:31 PM CDT (23:31 UTC)
Expired: Aug 11, 2011, 7:00 PM CDT
In force: 29 min
Issued by: NWS Huntsville, AL

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 84 km from the middle of the area, began a volume at 23:34 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, 11.5 hours before the alert went out and 83 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: 1979 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 749 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 11, 6:10 PM CDT, 21 minutes earlier.

Area forecast discussion, Aug 11, 6:10 PM CDT, 21 minutes before

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Hazardous weather outlook, Aug 11, 12:45 PM CDT, 5 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1245 PM CDT THU AUG 11 2011

ALZ001>010-016-TNZ076-096-097-121000-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
1245 PM CDT THU AUG 11 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA THIS AFTERNOON AND
EVENING...WITH STRONG WIND GUSTS AS THE PRIMARY THREAT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

A FEW THUNDERSTORMS ARE POSSIBLE ON FRIDAY...MAINLY DURING THE
AFTERNOON AND EVENING. HOWEVER...THUNDERSTORM CHANCES WILL INCREASE
ON SATURDAY AND SATURDAY NIGHT AS A COLD FRONT MOVES INTO THE REGION.
THE STRONGEST THUNDERSTORMS DURING THIS PERIOD MAY BE CAPABLE OF
PRODUCING DAMAGING WIND GUSTS...HAIL...AND FREQUENT LIGHTNING. DUE TO
THE POSSIBILITY FOR LOCALLY HEAVY RAINFALL AMOUNTS...THE CHANCE FOR
LOCALIZED FLASH FLOODING WILL INCREASE LATE SATURDAY AHEAD OF THE
FRONTAL PASSAGE.

A FEW THUNDERSTORMS WILL BE POSSIBLE ACROSS THE AREA AGAIN ON
WEDNESDAY.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL
IS NOT ANTICIPATED AT THIS TIME.

KDW

In the hours before

Local storm report, Aug 11, 5:26 PM CDT, 1 hour 5 minutes before

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Local storm report, Aug 11, 5:26 PM CDT, 1 hour 5 minutes before

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Local storm report, Aug 11, 5:26 PM CDT, 1 hour 5 minutes before

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Special weather statement, Aug 11, 5:50 PM CDT, 41 minutes before

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Special weather statement, Aug 11, 6:11 PM CDT, 20 minutes before

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Special weather statement, Aug 11, 6:31 PM CDT, 0 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
Aug 11, 4:37 PM CDT	Special Weather Statement	HUN	Lauderdale	23 min
Aug 11, 4:49 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence	26 min
Aug 11, 5:08 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lawrence	37 min
Aug 11, 5:31 PM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lawrence	29 min
Aug 11, 5:50 PM CDT	Special Weather Statement	HUN	Franklin	25 min
Aug 11, 5:56 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence	13 min
Aug 11, 6:11 PM CDT	Special Weather Statement	HUN	Franklin	49 min
Aug 11, 6:43 PM CDT	Special Weather Statement	HUN	Franklin	47 min
Aug 11, 6:57 PM CDT	Special Weather Statement	HUN	Cullman	33 min

Nearby

Special Weather Statements in Alabama, 2011 Every special weather statement 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.