Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 187, NWS Mobile, AL

July 31, 2011Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jul 31, 2011, 5:19 PM CDT for Baldwin County, Alabama. It was in force for 26 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: Jul 31, 2011, 5:19 PM CDT (22:19 UTC)
Expired: Jul 31, 2011, 5:45 PM CDT
In force: 26 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 51 km from the middle of the area, began a volume at 22:22 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.3 hours before the alert went out and 184 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2762 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 736 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 6 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.

809 
WUUS54 KMOB 312219
SVRMOB
ALC003-312245-
/O.NEW.KMOB.SV.W.0187.110731T2219Z-110731T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
519 PM CDT SUN JUL 31 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL BALDWIN COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 545 PM CDT

* AT 518 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  NORTHWEST OF FOLEY...OR NEAR MAGNOLIA SPRINGS...AND MOVING
  NORTHEAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO      
  SUMMERDALE AND SILVERHILL.

&&

LAT...LON 3039 8783 3040 8782 3040 8784 3045 8790
      3058 8776 3049 8759 3034 8775
TIME...MOT...LOC 2220Z 221DEG 5KT 3046 8775

$$

2 follow-up statements

170 
WWUS54 KMOB 312231
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
531 PM CDT SUN JUL 31 2011

ALC003-312245-
/O.CON.KMOB.SV.W.0187.000000T0000Z-110731T2245Z/
BALDWIN AL-
531 PM CDT SUN JUL 31 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR SOUTH CENTRAL BALDWIN COUNTY...

AT 527 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR SUMMERDALE...OR NEAR FOLEY...MOVING EAST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

LAT...LON 3039 8783 3040 8782 3040 8784 3041 8785
      3055 8770 3049 8759 3034 8775
TIME...MOT...LOC 2232Z 275DEG 6KT 3044 8771

$$

017 
WWUS54 KMOB 312244
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
544 PM CDT SUN JUL 31 2011

ALC003-312254-
/O.EXP.KMOB.SV.W.0187.000000T0000Z-110731T2245Z/
BALDWIN AL-
544 PM CDT SUN JUL 31 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BALDWIN COUNTY
WILL EXPIRE AT 545 PM CDT...

THE STORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS. 

LAT...LON 3039 8783 3040 8782 3040 8784 3041 8785
      3055 8770 3049 8759 3034 8775
TIME...MOT...LOC 2244Z 275DEG 6KT 3044 8769

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 4:33 PM CDT	Special Marine Warning	MOB		42 min
Jul 31, 4:42 PM CDT	Areal Flood Advisory	MOB	Mobile	63 min
Jul 31, 5:47 PM CDT	Special Marine Warning	MOB		43 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every 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.