Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 27, NWS Mobile, AL

March 1, 2012Covington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 1, 2012, 11:56 AM CST for Covington County, Alabama. It was in force for 19 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
Mar 1, 2012, 11:56 AM CST (17:56 UTC)
Expired
Mar 1, 2012, 12:15 PM CST
In force
19 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Covington County, AL

The radar

The Eglin Afb radar (KEVX), 69 km from the middle of the area, began a volume at 17:58 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 12:00Z, 5.9 hours before the alert went out and 202 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 12:00Z on 2012-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 240 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, Tallahassee Rgnl, FL at 12:00Z on 2012-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 170 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
240 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
499 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
170 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

285 
WUUS54 KMOB 011756
SVRMOB
ALC039-011815-
/O.NEW.KMOB.SV.W.0027.120301T1756Z-120301T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1156 AM CST THU MAR 1 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 1215 PM CST

* AT 1153 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES NORTHEAST OF FLORALA...
  OR 7 MILES SOUTH OF ONYCHA...AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BLUE SPRINGS...       GREEN BAY...

&&

LAT...LON 3106 8619 3108 8637 3122 8631 3122 8619
      3111 8618
TIME...MOT...LOC 1756Z 281DEG 33KT 3112 8621

$$
2 follow-up statements
010 
WWUS54 KMOB 011808
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1208 PM CST THU MAR 1 2012

ALC039-011815-
/O.CON.KMOB.SV.W.0027.000000T0000Z-120301T1815Z/
COVINGTON AL-
1208 PM CST THU MAR 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM CST
FOR SOUTHEASTERN COVINGTON COUNTY...

AT 1202 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 11 MILES SOUTHEAST OF 
OPP...MOVING EAST AT 40 MPH.

THE STORM WILL EXIT THE COUNTY BY 1215 PM CST.

LAT...LON 3106 8619 3107 8628 3114 8628 3122 8619
      3111 8618
TIME...MOT...LOC 1808Z 262DEG 34KT 3114 8611

$$
277 
WWUS54 KMOB 011811
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1211 PM CST THU MAR 1 2012

ALC039-011821-
/O.EXP.KMOB.SV.W.0027.000000T0000Z-120301T1815Z/
COVINGTON AL-
1211 PM CST THU MAR 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN COVINGTON COUNTY 
WILL BE ALLOWED TO EXPIRE AT 1215 PM CST...

THE SEVERE THUNDERSTORM HAS SINCE MOVED EAST OF THE COUNTY.

LAT...LON 3106 8619 3107 8628 3114 8628 3122 8619
      3111 8618
TIME...MOT...LOC 1811Z 180DEG 0KT 3113 8618

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 1, 9:08 AM CSTAreal Flood AdvisoryMOBBaldwin, Clarke, Monroe, Washington112 min
Mar 1, 9:51 AM CSTSevere Thunderstorm WarningMOBConecuh, Escambia54 min
Mar 1, 11:38 AM CSTSevere Thunderstorm WarningMOBButler, Conecuh, Monroe22 min
Mar 1, 3:50 PM CSTDense Fog AdvisoryMOB15 hr
Mar 1, 3:55 PM CSTMarine Dense Fog AdvisoryMOB20 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.