Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 174, NWS Mobile, AL

August 10, 2012Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 10, 2012, 4:29 PM CDT for Baldwin County, Alabama. It was in force for 32 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 10, 2012, 4:29 PM CDT (21:29 UTC)
Expired
Aug 10, 2012, 5:01 PM CDT
In force
32 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 68 km from the middle of the area, began a volume at 21:32 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, 9.5 hours before the alert went out and 206 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 2012-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3400 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, Slidell Radar S, LA at 12:00Z on 2012-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
3400 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
530 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
96 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.

902 
WUUS54 KMOB 102129
SVRMOB
ALC003-102215-
/O.NEW.KMOB.SV.W.0174.120810T2129Z-120810T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
429 PM CDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BALDWIN COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 515 PM CDT

* AT 422 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 19 MILES NORTH
  OF BAY MINETTE...OR 10 MILES EAST OF CALVERT...AND MOVING EAST AT
  10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RURAL NORTHWESTERN BALDWIN COUNTY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. PREPARE FOR DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3105 8792 3116 8794 3115 8790 3116 8789
      3115 8787 3117 8788 3116 8788 3117 8786
      3121 8787 3121 8785 3124 8785 3122 8784
      3125 8783 3127 8769 3124 8762 3104 8762
TIME...MOT...LOC 2129Z 264DEG 7KT 3115 8783

$$
1 follow-up statement
170 
WWUS54 KMOB 102201
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
501 PM CDT FRI AUG 10 2012

ALC003-102211-
/O.CAN.KMOB.SV.W.0174.000000T0000Z-120810T2215Z/
BALDWIN AL-
501 PM CDT FRI AUG 10 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR
NORTHWESTERN BALDWIN COUNTY...

AT 500 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR NORTHWESTERN
BALDWIN COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3105 8792 3116 8794 3115 8790 3116 8789
      3115 8787 3117 8788 3116 8788 3117 8786
      3121 8787 3121 8785 3124 8785 3122 8784
      3125 8783 3127 8769 3124 8762 3104 8762
TIME...MOT...LOC 2201Z 264DEG 7KT 3116 8776

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 11:56 AM CDTSpecial Marine WarningMOB64 min
Aug 10, 12:12 PM CDTSpecial Marine WarningMOB63 min
Aug 10, 1:14 PM CDTSpecial Marine WarningMOB91 min
Aug 10, 2:02 PM CDTSpecial Marine WarningMOB43 min
Aug 10, 3:31 PM CDTSevere Thunderstorm WarningMOBMobile25 min
Aug 10, 5:15 PM CDTAreal Flood AdvisoryMOBBaldwin2 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.