Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Mobile, AL

March 23, 2012Covington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 23, 2012, 8:47 AM CDT for Covington 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 outline as issued.

The facts

Issued
Mar 23, 2012, 8:47 AM CDT (13:47 UTC)
Expired
Mar 23, 2012, 9:30 AM CDT
In force
43 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Covington County, AL

The radar

The Eglin Afb radar (KEVX), 67 km from the middle of the area, began a volume at 13:49 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 1.8 hours before the alert went out and 206 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, Tallahassee Rgnl, FL at 12:00Z on 2012-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 758 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, Tallahassee Rgnl, FL at 12:00Z on 2012-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 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
758 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
800 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

564 
WUUS54 KMOB 231347
SVRMOB
ALC039-231430-
/O.NEW.KMOB.SV.W.0039.120323T1347Z-120323T1430Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
847 AM CDT FRI MAR 23 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 930 AM CDT

* AT 845 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 9 MILES NORTHWEST OF FLORALA TO 13 MILES WEST OF FLORALA...AND
  MOVING EAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  HORN HILL AROUND 900 AM CDT...
  ONYCHA AROUND 905 AM CDT...
  LOCKHART AROUND 915 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3099 8619 3099 8638 3099 8648 3124 8655
      3131 8619 3100 8618
TIME...MOT...LOC 1347Z 256DEG 22KT 3115 8639 3103 8654

$$
1 follow-up statement
866 
WWUS54 KMOB 231421
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
921 AM CDT FRI MAR 23 2012

ALC039-231430-
/O.CON.KMOB.SV.W.0039.000000T0000Z-120323T1430Z/
COVINGTON AL-
921 AM CDT FRI MAR 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 AM CDT
FOR SOUTHEASTERN COVINGTON COUNTY...

AT 917 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM BEULAH TO STEDMAN...OR ALONG A LINE EXTENDING FROM OPP
TO FLORALA...MOVING EAST AT 25 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  HOWELLS BY 930 AM CDT...

THIS STORM HAS PRODUCED SMALL HAIL AND ESTIMATED WIND GUSTS OF 45 TO 
50 MPH DURING THE PAST 30 MINUTES. 

LAT...LON 3099 8619 3099 8638 3100 8645 3128 8634
      3131 8619 3100 8618
TIME...MOT...LOC 1421Z 256DEG 22KT 3122 8621 3108 8630

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 23, 3:56 AM CDTSevere Thunderstorm WarningMOBConecuh, Monroe49 min
Mar 23, 4:08 AM CDTTornado WarningMOBConecuh, Monroe37 min
Mar 23, 4:37 AM CDTTornado WarningMOBButler, Conecuh16 min
Mar 23, 6:54 AM CDTAreal Flood AdvisoryMOBMobile111 min
Mar 23, 10:01 AM CDTRiver Flood WarningMOBChoctaw, Clarke, Washington6 days
Mar 23, 10:01 AM CDTRiver Flood WarningMOBChoctaw, Clarke, Washington6 days
Mar 23, 10:04 AM CDTSpecial Marine WarningMOB86 min
Mar 23, 10:57 AM CDTSpecial Marine WarningMOB48 min
Mar 23, 1:35 PM CDTSpecial Marine WarningMOB55 min

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.