Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 186, NWS Mobile, AL

August 18, 2012Crenshaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 18, 2012, 7:21 PM CDT for Crenshaw County, Alabama. It was in force for 40 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 18, 2012, 7:21 PM CDT (00:21 UTC)
Expired
Aug 18, 2012, 8:01 PM CDT
In force
40 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Crenshaw County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.4 hours before the alert went out and 169 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 2012-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1866 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 00:00Z on 2012-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
1866 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
653 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
53 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

098 
WUUS54 KMOB 190021
SVRMOB
ALC041-190115-
/O.NEW.KMOB.SV.W.0186.120819T0021Z-120819T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
721 PM CDT SAT AUG 18 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CRENSHAW COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 815 PM CDT

* AT 719 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 15 MILES NORTH
  OF ANDALUSIA...OR 5 MILES NORTHWEST OF DOZIER...AND MOVING
  NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RUTLEDGE...           PETREY...             LUVERNE...
  GLENWOOD...           DOZIER...             BRANTLEY...

LAT...LON 3151 8628 3152 8628 3145 8640 3153 8640
      3153 8650 3165 8650 3166 8645 3178 8645
      3206 8632 3204 8629 3197 8629 3196 8618
      3189 8617 3180 8620 3179 8615 3178 8614
      3166 8614 3163 8618 3161 8614
TIME...MOT...LOC 0021Z 216DEG 22KT 3154 8643

$$
1 follow-up statement
716 
WWUS54 KMOB 190101
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
801 PM CDT SAT AUG 18 2012

ALC041-190112-
/O.CAN.KMOB.SV.W.0186.000000T0000Z-120819T0115Z/
CRENSHAW AL-
801 PM CDT SAT AUG 18 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR CRENSHAW
COUNTY...

AT 756 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR CRENSHAW
COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3151 8628 3152 8628 3145 8640 3153 8640
      3153 8650 3165 8650 3166 8645 3178 8645
      3206 8632 3204 8629 3197 8629 3196 8618
      3189 8617 3180 8620 3179 8615 3178 8614
      3166 8614 3163 8618 3161 8614
TIME...MOT...LOC 0102Z 216DEG 22KT 3174 8626

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 10:16 AM CDTSpecial Marine WarningMOB119 min
Aug 19, 11:38 AM CDTSpecial Marine WarningMOB97 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.