Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 193, NWS Mobile, AL

August 12, 2011Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 12, 2011, 3:56 PM CDT for Mobile County, Alabama. It was in force for 49 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
Aug 12, 2011, 3:56 PM CDT (20:56 UTC)
Expired
Aug 12, 2011, 4:45 PM CDT
In force
49 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Mobile County, AL

The radar

The Mobile radar (KMOB), 40 km from the middle of the area, began a volume at 20:57 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.9 hours before the alert went out and 142 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, Slidell Radar S, LA at 12:00Z on 2011-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4203 joules per kilogram.LCLEL10008507005003002001001 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, Slidell Radar S, LA at 12:00Z on 2011-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 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
4203 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
580 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-42 m²/s²
0-3 km storm-relative helicity
-26 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.8

Open this sounding in Storm Lab

The text

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

868 
WUUS54 KMOB 122056
SVRMOB
ALC097-122145-
/O.NEW.KMOB.SV.W.0193.110812T2056Z-110812T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
356 PM CDT FRI AUG 12 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL MOBILE COUNTY IN SOUTHWEST ALABAMA...  
  THIS INCLUDES BAYOU LA BATRE AND DAUPHIN ISLAND...

* UNTIL 445 PM CDT

* AT 354 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND   
  DAMAGING WINDS NEAR 60 MPH.  THIS STORM WAS LOCATED NEAR 
  BAYOU LA BATRE...MOVING SOUTH AT 10 MPH.

&&

LAT...LON 3022 8831 3023 8832 3027 8813 3029 8813
      3032 8823 3032 8821 3036 8820 3037 8825
      3032 8826 3033 8827 3037 8826 3038 8829
      3036 8832 3043 8832 3043 8809 3037 8810
      3030 8814 3025 8807
TIME...MOT...LOC 2055Z 359DEG 10KT 3035 8820

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 4:35 AM CDTHeat AdvisoryMOB11 hr
Aug 12, 9:31 AM CDTSpecial Marine WarningMOB59 min
Aug 12, 9:46 AM CDTSpecial Marine WarningMOB44 min
Aug 12, 12:23 PM CDTSpecial Marine WarningMOB82 min
Aug 12, 2:59 PM CDTSpecial Marine WarningMOB61 min
Aug 12, 3:49 PM CDTSpecial Marine WarningMOB86 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.