Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 180, NWS Mobile, AL

August 16, 2012Choctaw County, Clarke County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 16, 2012, 12:46 PM CDT for Choctaw County, Clarke County, Alabama. It was in force for 33 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 16, 2012, 12:46 PM CDT (17:46 UTC)
Expired
Aug 16, 2012, 1:19 PM CDT
In force
33 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Choctaw County, AL, Clarke County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 5.8 hours before the alert went out and 181 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 12:00Z on 2012-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 761 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2012-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.193958Sfc1 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
761 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
1023 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

700 
WUUS54 KMOB 161746
SVRMOB
ALC023-025-161845-
/O.NEW.KMOB.SV.W.0180.120816T1746Z-120816T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1246 PM CDT THU AUG 16 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  NORTHWESTERN CLARKE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 145 PM CDT

* AT 1243 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING
  DAMAGING WINDS OVER 60 MPH WAS LOCATED 4 MILES SOUTHWEST OF
  BUTLER...OR 6 MILES NORTHEAST OF NEEDHAM...AND MOVING SOUTHEAST AT
  15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TOXEY...              NEEDHAM...            BUTLER...

LAT...LON 3206 8810 3205 8811 3200 8810 3201 8808
      3199 8806 3199 8799 3197 8795 3173 8813
      3201 8842 3217 8827
TIME...MOT...LOC 1746Z 311DEG 15KT 3204 8826

$$
1 follow-up statement
519 
WWUS54 KMOB 161819
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
119 PM CDT THU AUG 16 2012

ALC023-025-161829-
/O.CAN.KMOB.SV.W.0180.000000T0000Z-120816T1845Z/
CHOCTAW AL-CLARKE AL-
119 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR
NORTHWESTERN CLARKE AND CHOCTAW COUNTIES...

AT 116 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR NORTHWESTERN
CLARKE AND CHOCTAW COUNTIES HAS WEAKENED TO BELOW SEVERE LIMITS...
THUS THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3206 8810 3205 8811 3200 8810 3201 8808
      3199 8806 3199 8799 3197 8795 3173 8813
      3201 8842 3217 8827
TIME...MOT...LOC 1819Z 311DEG 15KT 3195 8814

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 10:09 AM CDTSpecial Marine WarningMOB96 min
Aug 16, 12:59 PM CDTSevere Thunderstorm WarningMOBChoctaw, Washington22 min
Aug 16, 1:36 PM CDTSevere Thunderstorm WarningMOBChoctaw22 min
Aug 16, 2:35 PM CDTSevere Thunderstorm WarningMOBClarke, Monroe30 min
Aug 16, 3:34 PM CDTSevere Thunderstorm WarningMOBWilcox29 min
Aug 16, 4:22 PM CDTSpecial Marine WarningMOB53 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.