Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 182, NWS Mobile, AL

August 16, 2012Choctaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 16, 2012, 1:36 PM CDT for Choctaw County, Alabama. It was in force for 22 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, 1:36 PM CDT (18:36 UTC)
Expired
Aug 16, 2012, 1:58 PM CDT
In force
22 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Choctaw County, AL

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.6 hours before the alert went out and 188 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, Jackson, MS at 12:00Z on 2012-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2430 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, Jackson, MS at 12:00Z on 2012-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -49 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
2430 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
902 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-49 m²/s²
0-3 km storm-relative helicity
-58 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.

921 
WUUS54 KMOB 161836
SVRMOB
ALC023-161915-
/O.NEW.KMOB.SV.W.0182.120816T1836Z-120816T1915Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 215 PM CDT

* AT 135 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED 14 MILES SOUTH OF BUTLER...OR NEAR
  TOXEY...AND MOVING EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TOXEY...              NEEDHAM...            GILBERTOWN...

LAT...LON 3200 8807 3196 8807 3196 8810 3195 8812
      3192 8809 3193 8807 3192 8807 3190 8813
      3187 8813 3182 8818 3178 8816 3181 8841
      3199 8840 3201 8808
TIME...MOT...LOC 1837Z 273DEG 19KT 3190 8829

$$
1 follow-up statement
616 
WWUS54 KMOB 161858
SVSMOB

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

ALC023-161908-
/O.CAN.KMOB.SV.W.0182.000000T0000Z-120816T1915Z/
CHOCTAW AL-
158 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR SOUTHERN
CHOCTAW COUNTY...

AT 154 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR SOUTHERN
CHOCTAW COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3200 8807 3196 8807 3196 8810 3195 8812
      3192 8809 3193 8807 3192 8807 3190 8813
      3187 8813 3182 8818 3178 8816 3181 8841
      3199 8840 3201 8808
TIME...MOT...LOC 1858Z 273DEG 19KT 3189 8816

$$

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, 12:46 PM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke33 min
Aug 16, 12:59 PM CDTSevere Thunderstorm WarningMOBChoctaw, Washington22 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.