Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 70, NWS Mobile, AL

May 30, 2012Covington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at May 30, 2012, 2:23 AM CDT for Covington County, Alabama. It was in force for 37 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, 2:23 AM CDT (07:23 UTC)
Expired
May 30, 2012, 3:00 AM CDT
In force
37 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Covington County, AL

The radar

The Eglin Afb radar (KEVX), 64 km from the middle of the area, began a volume at 07:22 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 7.4 hours before the alert went out and 200 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, Tallahassee Rgnl, FL at 00:00Z on 2012-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 919 joules per kilogram.LCLEL10008507005003002001001 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, Tallahassee Rgnl, FL at 00:00Z on 2012-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
919 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1477 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
94 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.

454 
WUUS54 KMOB 300723
SVRMOB
ALC039-300800-
/O.NEW.KMOB.SV.W.0070.120530T0723Z-120530T0800Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 300 AM CDT

* AT 220 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 7 MILES
  NORTHEAST OF FLORALA...OR 8 MILES SOUTH OF ONYCHA...AND MOVING
  SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RURAL SOUTHEASTERN COVINGTON COUNTY

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.

&&

LAT...LON 3099 8619 3099 8629 3110 8641 3122 8623
      3119 8619 3100 8618
TIME...MOT...LOC 0723Z 316DEG 17KT 3110 8626

$$
2 follow-up statements
511 
WWUS54 KMOB 300742
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
242 AM CDT WED MAY 30 2012

ALC039-300800-
/O.CON.KMOB.SV.W.0070.000000T0000Z-120530T0800Z/
COVINGTON AL-
242 AM CDT WED MAY 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR SOUTHEASTERN COVINGTON COUNTY...

AT 240 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 4 MILES
NORTHEAST OF FLORALA...OR 5 MILES NORTHEAST OF LOCKHART...MOVING
SOUTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  RURAL SOUTHEASTERN COVINGTON COUNTY

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.

&&

LAT...LON 3118 8619 3100 8618 3099 8619 3099 8629
      3108 8639
TIME...MOT...LOC 0742Z 310DEG 14KT 3105 8628

$$
644 
WWUS54 KMOB 300803
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
303 AM CDT WED MAY 30 2012

ALC039-300812-
/O.EXP.KMOB.SV.W.0070.000000T0000Z-120530T0800Z/
COVINGTON AL-
303 AM CDT WED MAY 30 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE FOR
SOUTHEASTERN COVINGTON COUNTY...

AT 258 AM CDT...THE STORM THAT PROMPTED THE WARNING FOR SOUTHEASTERN 
COVINGTON COUNTY IS BEGINNING TO MOVE OUT OF THE COUNTY...THUS THE 
SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE.

SMALL HAIL AND STRONG WINDS OF 40 TO 50 MPH ARE STILL POSSIBLE IN 
EXTREME SOUTHEAST COVINGTON COUNTY THROUGH 315 AM. 

LAT...LON 3118 8619 3100 8618 3099 8619 3099 8629
      3108 8639
TIME...MOT...LOC 0742Z 310DEG 14KT 3105 8628

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 9:32 PM CDTSpecial Marine WarningMOB88 min
May 30, 2:12 PM CDTSpecial Marine WarningMOB93 min
May 30, 2:54 PM CDTSevere Thunderstorm WarningMOBMobile66 min
May 30, 3:00 PM CDTSevere Thunderstorm WarningMOBBaldwin60 min
May 30, 3:19 PM CDTSevere Thunderstorm WarningMOBBaldwin, Mobile56 min
May 30, 4:03 PM CDTSevere Thunderstorm WarningMOBMobile57 min
May 30, 4:12 PM CDTSevere Thunderstorm WarningMOBClarke37 min
May 30, 4:16 PM CDTSevere Thunderstorm WarningMOBMobile59 min
May 30, 4:21 PM CDTSevere Thunderstorm WarningMOBMobile54 min
May 30, 5:06 PM CDTSevere Thunderstorm WarningMOBConecuh, Monroe54 min
May 30, 5:14 PM CDTSevere Thunderstorm WarningMOBChoctaw24 min
May 30, 5:38 PM CDTSevere Thunderstorm WarningMOBClarke67 min
May 30, 5:52 PM CDTSevere Thunderstorm WarningMOBMonroe29 min
May 30, 6:20 PM CDTSevere Thunderstorm WarningMOBCovington, Escambia32 min
May 30, 6:47 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.