Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 181, NWS Mobile, AL

August 16, 2012Wayne County, Mississippi; Choctaw County, Washington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 16, 2012, 12:59 PM CDT for Wayne County, Mississippi; Choctaw County, Washington 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, 12:59 PM CDT (17:59 UTC)
Expired
Aug 16, 2012, 1:21 PM CDT
In force
22 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Choctaw County, AL, Washington County, AL, Wayne County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.0 hours before the alert went out and 189 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.

599 
WUUS54 KMOB 161759
SVRMOB
ALC023-129-MSC153-161900-
/O.NEW.KMOB.SV.W.0181.120816T1759Z-120816T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1259 PM CDT THU AUG 16 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN WAYNE COUNTY IN SOUTHEAST MISSISSIPPI...
  SOUTHWESTERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  NORTHWESTERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 200 PM CDT

* AT 1257 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING
  DAMAGING WINDS OVER 60 MPH WAS LOCATED 11 MILES NORTHEAST OF
  WAYNESBORO...OR 10 MILES WEST OF SILAS...AND MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SILAS...              MILLRY...

LAT...LON 3184 8816 3181 8818 3176 8815 3175 8814
      3176 8811 3174 8809 3166 8808 3165 8809
      3162 8808 3157 8809 3169 8861 3187 8858
TIME...MOT...LOC 1759Z 280DEG 14KT 3177 8849

$$
1 follow-up statement
142 
WWUS54 KMOB 161821
SVSMOB

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

ALC023-129-MSC153-161831-
/O.CAN.KMOB.SV.W.0181.000000T0000Z-120816T1900Z/
CHOCTAW AL-WASHINGTON AL-WAYNE MS-
121 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR
NORTHEASTERN WAYNE...NORTHWESTERN WASHINGTON AND SOUTHWESTERN CHOCTAW
COUNTIES...

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

LAT...LON 3184 8816 3181 8818 3176 8815 3175 8814
      3176 8811 3174 8809 3166 8808 3165 8809
      3162 8808 3157 8809 3169 8861 3187 8858
TIME...MOT...LOC 1821Z 280DEG 14KT 3176 8839

$$

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, 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, 2012Severe Thunderstorm Warnings in Mississippi, 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.