Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS Huntsville, AL

February 22, 2012Lawrence County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Feb 22, 2012, 6:08 PM CST for Lawrence County, Alabama. It was in force for 23 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
Feb 22, 2012, 6:08 PM CST (00:08 UTC)
Expired
Feb 22, 2012, 6:31 PM CST
In force
23 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon

County Lawrence County, AL

The radar

The Columbus AFB radar (KGWX), 105 km from the middle of the area, began a volume at 00:09 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, 0.1 hours before the alert went out and 143 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, Birmingham, AL at 00:00Z on 2012-02-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 700 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2012-02-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 351 square meters per square second.1939587897117136156Sfc1 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
700 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
779 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
351 m²/s²
0-3 km storm-relative helicity
462 m²/s²
Significant tornado parameter
2.0
Supercell composite
6.7

Open this sounding in Storm Lab

The text

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

231 
WUUS54 KHUN 230008
SVRHUN
ALC079-230045-
/O.NEW.KHUN.SV.W.0013.120223T0008Z-120223T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HUNTSVILLE AL
608 PM CST WED FEB 22 2012

THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LAWRENCE COUNTY IN NORTHWEST ALABAMA...

* UNTIL 645 PM CST

* AT 605 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  SOUTH OF MT HOPE...AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WREN...
  SPEAKE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR INTERIOR ROOM.

&&

LAT...LON 3431 8751 3447 8751 3449 8711 3430 8711
TIME...MOT...LOC 0008Z 271DEG 34KT 3437 8742

$$
SL
2 follow-up statements
689 
WWUS54 KHUN 230021
SVSHUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
621 PM CST WED FEB 22 2012

ALC079-230045-
/O.CON.KHUN.SV.W.0013.000000T0000Z-120223T0045Z/
LAWRENCE AL-
621 PM CST WED FEB 22 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CST
FOR SOUTHEASTERN LAWRENCE COUNTY...

AT 621 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR WREN...MOVING EAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SPEAKE 
AND BANKHEAD NATIONAL FOREST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3431 8743 3447 8736 3447 8711 3430 8711
TIME...MOT...LOC 0021Z 275DEG 32KT 3436 8723

$$

SL
823 
WWUS54 KHUN 230031
SVSHUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
631 PM CST WED FEB 22 2012

ALC079-230041-
/O.CAN.KHUN.SV.W.0013.000000T0000Z-120223T0045Z/
LAWRENCE AL-
631 PM CST WED FEB 22 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LAWRENCE COUNTY
IS CANCELED...

WEATHER SERVICE DOPPLER RADAR INDICATES THE THUNDERSTORM THAT 
PROMPTED THE WARNING HAS MOVED OUT OF THE COUNTY AND IS NO LONGER 
SEVERE. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELED.

HEAVY RAIN...SMALL HAIL...GUSTY WINDS...AND FREQUENT LIGHTNING ARE
STILL POSSIBLE FROM THIS THUNDERSTORM. STAY INDOORS UNTIL THE STORM
HAS PASSED.

LAT...LON 3431 8743 3447 8736 3447 8711 3430 8711
TIME...MOT...LOC 0031Z 275DEG 32KT 3435 8712

$$

SL

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 22, 6:01 PM CSTSevere Thunderstorm WarningHUNJackson, Madison29 min
Feb 22, 6:31 PM CSTSpecial Weather StatementHUNMadison29 min
Feb 22, 6:37 PM CSTSpecial Weather StatementHUNMorgan38 min
Feb 22, 6:38 PM CSTSpecial Weather StatementHUNJackson37 min
Feb 22, 6:57 PM CSTSpecial Weather StatementHUNCullman48 min
Feb 22, 7:13 PM CSTSpecial Weather StatementHUNDeKalb32 min
Feb 22, 7:22 PM CSTSpecial Weather StatementHUNMarshall38 min
Feb 22, 7:58 PM CSTSpecial Weather StatementHUNEtowah32 min
Feb 22, 8:05 PM CSTSpecial Weather StatementHUNDeKalb25 min
Feb 23, 3:03 AM CSTWind AdvisoryHUNColbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more16 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2012Every severe thunderstorm warning in 2012

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.