Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 158, NWS Mobile, AL

July 30, 2012Covington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jul 30, 2012, 7:40 PM CDT for Covington County, Alabama. It was in force for 51 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 30, 2012, 7:40 PM CDT (00:40 UTC)
Expired
Jul 30, 2012, 8:31 PM CDT
In force
51 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Covington County, AL

What was reported inside it

TimeReportWhereRemark
Jul 30, 7:59 PM CDTHAIL 1Heath, ALNUMEROUS REPORTS OF QUARTER SIZE HAIL IN THE AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.7 hours before the alert went out and 207 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 2012-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 771 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2012-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 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
771 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1852 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

937 
WUUS54 KMOB 310040
SVRMOB
ALC039-310145-
/O.NEW.KMOB.SV.W.0158.120731T0040Z-120731T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
740 PM CDT MON JUL 30 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 845 PM CDT

* AT 737 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF
  BALL SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 9 MILES
  NORTHEAST OF ANDALUSIA...OR 5 MILES SOUTH OF DOZIER...AND MOVING
  SOUTH AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HORN HILL...          SANFORD...            ONYCHA...
  LIBERTYVILLE...       HEATH...              GANTT...
  CAROLINA...           BABBIE...             ANDALUSIA...

LAT...LON 3101 8627 3103 8663 3151 8647 3150 8640
      3145 8640 3149 8636 3150 8633 3149 8627
      3146 8628 3145 8627
TIME...MOT...LOC 0040Z 007DEG 19KT 3140 8638

$$
2 follow-up statements
931 
WWUS54 KMOB 310100
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
800 PM CDT MON JUL 30 2012

ALC039-310145-
/O.CON.KMOB.SV.W.0158.000000T0000Z-120731T0145Z/
COVINGTON AL-
800 PM CDT MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR CENTRAL COVINGTON COUNTY...

AT 755 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
SIZE HAIL WAS LOCATED 4 MILES SOUTHEAST OF ANDALUSIA...OR 2 MILES
NORTHEAST OF LIBERTYVILLE...MOVING SOUTHWEST AT 35 MPH.

NUMEROUS REPORTS OF QUARTER SIZE HAIL REPORTED NEAR THE HEATH COMMUNITY
NORTH OF ANDALUSIA.

LOCATIONS IMPACTED INCLUDE...
  HORN HILL...          SANFORD...            ONYCHA...
  LIBERTYVILLE...       HEATH...              GANTT...
  CAROLINA...           BABBIE...             ANDALUSIA...

LAT...LON 3101 8627 3103 8663 3151 8647 3150 8640
      3145 8640 3149 8636 3150 8633 3149 8627
      3146 8628 3145 8627
TIME...MOT...LOC 0100Z 023DEG 31KT 3123 8646

$$
890 
WWUS54 KMOB 310131
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
831 PM CDT MON JUL 30 2012

ALC039-310140-
/O.CAN.KMOB.SV.W.0158.000000T0000Z-120731T0145Z/
COVINGTON AL-
831 PM CDT MON JUL 30 2012

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

AT 828 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR CENTRAL 
COVINGTON COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...AND THUS THE 
SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3101 8627 3103 8663 3151 8647 3150 8640
      3145 8640 3149 8636 3150 8633 3149 8627
      3146 8628 3145 8627
TIME...MOT...LOC 0130Z 023DEG 31KT 3099 8658

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 8:21 PM CDTSevere Thunderstorm WarningMOBEscambia25 min
Jul 31, 4:33 AM CDTSevere Thunderstorm WarningMOBButler, Crenshaw87 min
Jul 31, 7:24 AM CDTSevere Thunderstorm WarningMOBButler, Wilcox66 min
Jul 31, 7:54 AM CDTSevere Thunderstorm WarningMOBButler, Crenshaw23 min
Jul 31, 8:15 AM CDTSpecial Marine WarningMOB60 min
Jul 31, 8:54 AM CDTAreal Flood AdvisoryMOBWilcox2 hr
Jul 31, 9:14 AM CDTSpecial Marine WarningMOB91 min
Jul 31, 9:32 AM CDTFlash Flood WarningMOBWilcox4 hr
Jul 31, 10:47 AM CDTSpecial Marine WarningMOB58 min
Jul 31, 11:52 AM CDTSpecial Marine WarningMOB83 min
Jul 31, 2:41 PM CDTSpecial Marine WarningMOB94 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.