Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 33, NWS Mobile, AL

March 27, 2011Covington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 27, 2011, 3:10 PM CDT for Covington County, Alabama. It was in force for 50 min. 7 reports 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
Mar 27, 2011, 3:10 PM CDT (20:10 UTC)
Expired
Mar 27, 2011, 4:00 PM CDT
In force
50 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Covington County, AL

The radar

The Eglin Afb radar (KEVX), 92 km from the middle of the area, began a volume at 20:10 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.

What was reported inside it

TimeReportWhereRemark
Mar 27, 3:16 PM CDTHAIL 1Andalusia, ALLARGE HAIL REPORT BY SPOTTER.
Mar 27, 3:16 PM CDTHAIL 1.75Carolina, ALREPORTED IN THE COMMUNITY BY STORM SPOTTER.
Mar 27, 3:20 PM CDTHAIL 1Carolina, ALDIME TO QUARTER SIZE HAIL REPORTED.
Mar 27, 3:30 PM CDTHAIL 1.752 N Andalusia, ALGOLF BALL SIZE HAIL REPORTED BY SPOTTER. DAMAGE TO AUTOMOBILE WINDOWS TO CAR/HOME IN THE HORN HILL COMMUNITY.
Mar 27, 3:30 PM CDTHAIL 1.753 Nw Onycha, ALGOLF BALL SIZE HAIL REPORTED BY SPOTTER. DAMAGE TO AUTOMEOBILE WINDOWS TO CAR/HOME IN THE HORN HILL COMMUNITY.
Mar 27, 3:34 PM CDTHAIL 1.75Onycha, ALLARGE HAIL REPORT BY EMA.
Mar 27, 3:43 PM CDTHAIL 1.75Estothel, ALREPORTED BY SPOTTER NEAR HWY 52...ESTOTHEL COMMUNITY.

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 12:00Z, 8.2 hours before the alert went out and 219 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 12:00Z on 2011-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 395 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 12:00Z on 2011-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.1939587897117Sfc1 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
395 J/kg
Mixed-layer CIN
-120 J/kg
Mixed-layer LCL
452 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The text

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

346 
WUUS54 KMOB 272010
SVRMOB
ALC039-272100-
/O.NEW.KMOB.SV.W.0033.110327T2010Z-110327T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
310 PM CDT SUN MAR 27 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...
  THIS INCLUDES THE CITIES OF...OPP...ANDALUSIA...

* UNTIL 400 PM CDT

* AT 304 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 13 MILES WEST OF ANDALUSIA...OR NEAR BROOKLYN...
  AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CAROLINA AROUND 320 PM CDT...
  LIBERTYVILLE AND ANDALUSIA AROUND 325 PM CDT...
  SANFORD AROUND 335 PM CDT...
  HORN HILL AND BABBIE AROUND 340 PM CDT...
  ONYCHA AND OPP AROUND 345 PM CDT...

&&

LAT...LON 3116 8670 3134 8670 3136 8619 3112 8618
TIME...MOT...LOC 2011Z 271DEG 31KT 3125 8662

$$
1 follow-up statement
127 
WWUS54 KMOB 272027
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
327 PM CDT SUN MAR 27 2011

ALC039-272100-
/O.CON.KMOB.SV.W.0033.000000T0000Z-110327T2100Z/
COVINGTON AL-
327 PM CDT SUN MAR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR CENTRAL COVINGTON COUNTY...

AT 322 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE 
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS 
NEAR LIBERTYVILLE...OR ABOUT NEAR ANDALUSIA...MOVING EAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WIGGINS AROUND 330 PM CDT...
  HORN HILL...BLUE SPRINGS AND BABBIE AROUND 335 PM CDT...BEULAH     
  AND OPP AROUND 340 PM CDT...
  ESTOTHEL AND COUNTY LINE AROUND 345 PM CDT...

HAIL UP TO QUARTER SIZE HAS BEEN REPORTED IN THE CAROLINA COMMUNITY  
WITH THIS STORM. SEEK SHELTER INSIDE A STURDY STRUCTURE AND STAY 
AWAY FROM WINDOWS.

LAT...LON 3116 8654 3134 8653 3134 8619 3113 8618
TIME...MOT...LOC 2025Z 272DEG 37KT 3125 8642

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 27, 12:51 PM CDTSevere Thunderstorm WarningMOBCrenshaw24 min
Mar 27, 2:41 PM CDTSevere Thunderstorm WarningMOBCovington4 min
Mar 27, 4:46 PM CDTSevere Thunderstorm WarningMOBCovington29 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011Every severe thunderstorm warning in 2011

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; radar from the NEXRAD Level II archive.