Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 206, NWS Mobile, AL

October 18, 2012Choctaw County, Clarke County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Oct 18, 2012, 2:39 AM CDT for Choctaw County, Clarke County, Alabama. It was in force for 51 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
Oct 18, 2012, 2:39 AM CDT (07:39 UTC)
Expired
Oct 18, 2012, 3:30 AM CDT
In force
51 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Choctaw County, AL, Clarke County, AL

The radar

The Mobile radar (KMOB), 149 km from the middle of the area, began a volume at 07:43 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

Birmingham, AL (KBMX), launched 00:00Z, 7.7 hours before the alert went out and 175 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 2012-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1776 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
125 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.

138 
WUUS54 KMOB 180739
SVRMOB
ALC023-025-180830-
/O.NEW.KMOB.SV.W.0206.121018T0739Z-121018T0830Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
239 AM CDT THU OCT 18 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 330 AM CDT

* AT 238 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 8 MILES
  SOUTHEAST OF BUTLER...OR 8 MILES WEST OF PUTNAM...AND MOVING EAST
  AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  THOMASVILLE...        FULTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
MOVE INDOORS IMMEDIATELY! IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

TO REPORT SEVERE WEATHER...CALL (800) 284-9059.

&&

LAT...LON 3212 8819 3208 8805 3206 8807 3207 8810
      3205 8811 3200 8810 3201 8808 3199 8806
      3200 8772 3198 8767 3174 8768 3186 8827
TIME...MOT...LOC 0739Z 291DEG 37KT 3198 8816

$$
1 follow-up statement
309 
WWUS54 KMOB 180813
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
313 AM CDT THU OCT 18 2012

ALC023-180822-
/O.CAN.KMOB.SV.W.0206.000000T0000Z-121018T0830Z/
CHOCTAW AL-
313 AM CDT THU OCT 18 2012

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

AT 310 AM CDT...THE STORM THAT PROMPTED THE WARNING FOR CENTRAL 
CHOCTAW COUNTY HAS MOVED OUT OF THE COUNTY...THUS THE SEVERE 
THUNDERSTORM WARNING HAS BEEN CANCELLED.

ADDITIONAL THUNDERSTORMS ARE CURRENTLY MOVING ACROSS CENTRAL CHOCTAW 
COUNTY...WITH THE PRIMARY THREATS BEING DANGEROUS LIGHTNING AND 
HEAVY DOWNPOURS. 

LAT...LON 3197 8767 3174 8768 3182 8809 3183 8810
      3199 8803 3200 8770
TIME...MOT...LOC 0812Z 283DEG 36KT 3190 8784

$$

ALC025-180830-
/O.CON.KMOB.SV.W.0206.000000T0000Z-121018T0830Z/
CLARKE AL-
313 AM CDT THU OCT 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 AM CDT
FOR NORTHERN CLARKE COUNTY...

AT 310 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 8 MILES WEST OF
THOMASVILLE...OR 7 MILES SOUTHEAST OF HOLTAMVILLE...MOVING EAST AT 40
MPH.

LOCATIONS IMPACTED INCLUDE...
  THOMASVILLE...        FULTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
MOVE INDOORS IMMEDIATELY! IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

TO REPORT SEVERE WEATHER...CALL (800) 284-9059.

&&

LAT...LON 3197 8767 3174 8768 3182 8809 3183 8810
      3199 8803 3200 8770
TIME...MOT...LOC 0812Z 283DEG 36KT 3190 8784

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 18, 1:56 AM CDTSevere Thunderstorm WarningMOBChoctaw49 min
Oct 18, 3:11 AM CDTAreal Flood AdvisoryMOBChoctaw2 hr
Oct 18, 4:59 AM CDTAreal Flood AdvisoryMOBClarke2 hr
Oct 18, 8:23 AM CDTSpecial Marine WarningMOB97 min
Oct 18, 10:19 AM CDTSpecial Marine WarningMOB41 min
Oct 18, 11:01 AM CDTSpecial Marine WarningMOB51 min
Oct 18, 2:28 PM CDTFire Weather WatchMOBButler, Conecuh, Covington, Crenshaw, Escambia15 hr

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.