Alert archive / Alabama / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 120, NWS Mobile, AL

August 22, 2010Washington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 22, 2010, 2:47 PM CDT for Washington County, Alabama. It was in force for 43 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
Aug 22, 2010, 2:47 PM CDT (19:47 UTC)
Expired
Aug 22, 2010, 3:30 PM CDT
In force
43 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Washington County, AL

The radar

The Mobile radar (KMOB), 81 km from the middle of the area, began a volume at 19:50 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.8 hours before the alert went out and 192 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, Slidell Radar S, LA at 12:00Z on 2010-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2604 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, Slidell Radar S, LA at 12:00Z on 2010-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 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
2604 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
724 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
43 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 2:15 PM CDT, 32 minutes earlier.

Area forecast discussion, Aug 22, 2:15 PM CDT, 32 minutes before
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Hazardous weather outlook, Aug 22, 5:30 AM CDT, 9 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOBILE AL
530 AM CDT SUN AUG 22 2010

ALZ051>064-FLZ001>006-GMZ630-650-655-670-675-MSZ067-075-076-078-
079-231200-
CHOCTAW-WASHINGTON-CLARKE-WILCOX-MONROE-CONECUH-BUTLER-CRENSHAW-
ESCAMBIA-COVINGTON-UPPER MOBILE-UPPER BALDWIN-LOWER MOBILE-
LOWER BALDWIN-INLAND ESCAMBIA-COASTAL ESCAMBIA-INLAND SANTA ROSA-
COASTAL SANTA ROSA-INLAND OKALOOSA-COASTAL OKALOOSA-MOBILE BAY-
COASTAL WATERS FROM PENSACOLA FL TO PASCAGOULA MS OUT 20 NM-
COASTAL WATERS FROM DESTIN TO PENSACOLA FL OUT 20 NM-
WATERS FROM PENSACOLA FL TO PASCAGOULA MS FROM 20 TO 60 NM-
WATERS FROM DESTIN TO PENSACOLA FL FROM 20 TO 60 NM-WAYNE-PERRY-
GREENE-STONE-GEORGE-
530 AM CDT SUN AUG 22 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
MISSISSIPPI...SOUTH CENTRAL AND SOUTHWEST ALABAMA...THE WESTERN
FLORIDA PANHANDLE...AND THE ADJACENT GULF COASTAL WATERS OF ALABAMA
AND NORTHWEST FLORIDA.

.DAY ONE...TODAY AND TONIGHT

SCATTERED TO LOCALLY NUMEROUS THUNDERSTORMS ARE EXPECTED TO DEVELOP
ACROSS THE CENTRAL GULF COAST TODAY. WHILE WIDESPREAD SEVERE
THUNDERSTORMS ARE NOT EXPECTED...A FEW OF THE STORMS COULD BECOME
STRONG TO POSSIBLY SEVERE. STRONG WIND GUSTS WILL BE THE PRIMARY
THREAT ALONG WITH HEAVY RAIN AND FREQUENT LIGHTNING.

HEAT INDEX READINGS WILL RANGE FROM 105 TO 110 TODAY.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

HEAT INDEX READINGS WILL RANGE FROM 105 TO 110 MONDAY.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL FOR SEVERE
WEATHER IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Aug 22, 1:51 PM CDT, 56 minutes before
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Special weather statement, Aug 22, 2:16 PM CDT, 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
216 PM CDT SUN AUG 22 2010

ALZ052-MSZ076-222015-
WASHINGTON-GREENE-
216 PM CDT SUN AUG 22 2010

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT WASHINGTON AND GREENE
COUNTIES...

AT 212 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS FROM 4 MILES WEST OF SUNFLOWER TO 3
MILES NORTHWEST OF FRUITDALE...MOVING SOUTH AT 20 MPH.

THIS LINE OF STORMS WILL AFFECT AREAS IN AND AROUND...
SUNFLOWER...SEABOARD...HAWTHORN...TOINETTE...ESCATAWPA...VINEGAR BEND
AND TOPTON THROUGH 315 PM CDT.

THE PRIMARY THREATS FROM THESE STORMS ARE...FREQUENT LIGHTNING...AND
WIND GUSTS OF 35 TO 45 MPH. WINDS THIS STRONG COULD DOWN SMALL TREE
LIMBS OR BRANCHES AND BLOW AROUND UNSECURED SMALL OBJECTS. SEEK
SHELTER IN A SAFE HOME OR BUILDING UNTIL THESE STORMS HAVE PASSED.

TO REPORT SEVERE WEATHER TO YOUR NATIONAL WEATHER SERVICE...CALL TOLL
FREE AT 1 8 7 7 6 3 3 6 7 7 2.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 1:31 PM CDTSpecial Marine WarningMOB14 min
Aug 22, 2:40 PM CDTAreal Flood AdvisoryMOBCrenshaw110 min
Aug 22, 2:50 PM CDTSpecial Marine WarningMOB40 min
Aug 22, 3:09 PM CDTHeat AdvisoryMOB28 hr
Aug 22, 3:29 PM CDTSpecial Marine WarningMOB61 min
Aug 22, 3:47 PM CDTAreal Flood AdvisoryMOBCovington, Crenshaw118 min
Aug 22, 3:49 PM CDTSevere Thunderstorm WarningMOBMobile41 min
Aug 22, 4:46 PM CDTSpecial Marine WarningMOB44 min
Aug 22, 5:12 PM CDTSpecial Marine WarningMOB36 min
Aug 22, 5:30 PM CDTSevere Thunderstorm WarningMOBBaldwin45 min
Aug 22, 5:37 PM CDTSpecial Marine WarningMOB98 min
Aug 22, 6:08 PM CDTSpecial Marine WarningMOB69 min
Aug 22, 3:56 PM CDTSevere Thunderstorm WarningMOBOkaloosa35 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2010Every severe thunderstorm 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.