Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 85, NWS Mobile, AL

May 30, 2012Choctaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at May 30, 2012, 7:15 PM CDT for Choctaw County, Alabama. It was in force for 60 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
May 30, 2012, 7:15 PM CDT (00:15 UTC)
Expired
May 30, 2012, 8:15 PM CDT
In force
60 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Choctaw County, AL

The radar

The Mobile radar (KMOB), 156 km from the middle of the area, began a volume at 00:19 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, 0.3 hours before the alert went out and 187 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 2012-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 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 2012-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.1939Sfc1 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
22 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
2709 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
30 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.

268 
WUUS54 KMOB 310015
SVRMOB
ALC023-310115-
/O.NEW.KMOB.SV.W.0085.120531T0015Z-120531T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
715 PM CDT WED MAY 30 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 815 PM CDT

* AT 714 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 7 MILES
  SOUTHWEST OF BUTLER...OR 4 MILES NORTHEAST OF NEEDHAM...AND MOVING
  NORTH AT 5 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3218 8837 3215 8807 3191 8822 3197 8842
TIME...MOT...LOC 0015Z 199DEG 3KT 3202 8829

$$
2 follow-up statements
400 
WWUS54 KMOB 310030
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
730 PM CDT WED MAY 30 2012

ALC023-310115-
/O.CON.KMOB.SV.W.0085.000000T0000Z-120531T0115Z/
CHOCTAW AL-
730 PM CDT WED MAY 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR CENTRAL CHOCTAW COUNTY...

AT 728 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 9 MILES
SOUTHWEST OF BUTLER...OR 3 MILES EAST OF NEEDHAM...MOVING EAST AT 10
MPH.

LOCATIONS IMPACTED INCLUDE...
  NEEDHAM...            BUTLER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3218 8837 3215 8807 3191 8822 3197 8842
TIME...MOT...LOC 0030Z 255DEG 11KT 3198 8827

$$
785 
WWUS54 KMOB 310106
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
806 PM CDT WED MAY 30 2012

ALC023-310116-
/O.EXP.KMOB.SV.W.0085.000000T0000Z-120531T0115Z/
CHOCTAW AL-
806 PM CDT WED MAY 30 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE FOR
CENTRAL CHOCTAW COUNTY...

AT 805 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR CENTRAL
CHOCTAW COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE
THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE AT 815 PM CDT.

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

LAT...LON 3218 8837 3215 8807 3191 8822 3197 8842
TIME...MOT...LOC 0106Z 255DEG 11KT 3201 8814

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 3:02 PM CDTSevere Thunderstorm WarningMOBButler58 min
May 31, 4:40 PM CDTSevere Thunderstorm WarningMOBWashington50 min
May 31, 5:05 PM CDTSevere Thunderstorm WarningMOBClarke, Washington40 min
May 31, 5:59 PM CDTSevere Thunderstorm WarningMOBChoctaw46 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; radar from the NEXRAD Level II archive.