Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 218, NWS Mobile, AL

September 28, 2011Baldwin County, Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 28, 2011, 2:49 PM CDT for Baldwin County, Mobile County, Alabama. It was in force for 41 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: Sep 28, 2011, 2:49 PM CDT (19:49 UTC)
Expired: Sep 28, 2011, 3:30 PM CDT
In force: 41 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Baldwin County, AL, Mobile County, AL

The radar

The Mobile radar (KMOB), 25 km from the middle of the area, began a volume at 19:50 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, 7.8 hours before the alert went out and 154 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: 3518 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 461 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

193 
WUUS54 KMOB 281949
SVRMOB
ALC003-097-282030-
/O.NEW.KMOB.SV.W.0218.110928T1949Z-110928T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
249 PM CDT WED SEP 28 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  SOUTHERN MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 330 PM CDT

* AT 245 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM SAINT ELMO TO DIXON CORNER TO NEAR CODEN...AND MOVING EAST AT 
  20 MPH. THIS STORM CONTAINS A DEVELOPING LOW LEVEL CIRCULATION AND 
  IS BEING MONITORED CLOSELY.

* LOCATIONS IMPACTED INCLUDE...
  CODEN...              TILLMANS CORNER...    THEODORE...
  I10 AND I65...        MOBILE...             BELLE FONTAINE...
  BAYOU LA BATRE...     POINT CLEAR...        FAIRHOPE...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 5 AND 30.

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 1 AND 6.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
ALTHOUGH NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3032 8816 3031 8819 3034 8821 3035 8820
      3036 8822 3056 8838 3077 8803 3063 8791
      3066 8794 3068 8801 3063 8805 3053 8807
      3051 8809 3037 8810 3030 8814
TIME...MOT...LOC 1947Z 291DEG 18KT 3052 8822 3048 8825
          3044 8822 3041 8825 3036 8837

$$

3 follow-up statements

864 
WWUS54 KMOB 281955
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
255 PM CDT WED SEP 28 2011

ALC003-282004-
/O.CAN.KMOB.SV.W.0218.000000T0000Z-110928T2030Z/
BALDWIN AL-
255 PM CDT WED SEP 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME WEST CENTRAL BALDWIN
COUNTY IS CANCELLED...

LAT...LON 3032 8816 3031 8819 3034 8821 3035 8820
      3036 8822 3051 8834 3052 8821 3053 8808
      3052 8808 3051 8809 3037 8810 3030 8814
TIME...MOT...LOC 1954Z 291DEG 18KT 3051 8818 3047 8821
          3043 8818 3040 8821 3035 8833

$$

ALC097-282030-
/O.CON.KMOB.SV.W.0218.000000T0000Z-110928T2030Z/
MOBILE AL-
255 PM CDT WED SEP 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR SOUTH CENTRAL MOBILE COUNTY...

AT 250 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM IRVINGTON TO DIXON CORNER TO CODEN...MOVING EAST AT 
20 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
NELSON...LAURENDINE...FOWL RIVER...DELCHAMPS...SOUTH ORCHARD...BELLE
FONTAINE...BAYLEYS CORNER...SMITHPORT...SUNNY COVE...MON LOUIS...
ALABAMA PORT...HERON BAY AND FAUSTINAS

LAT...LON 3032 8816 3031 8819 3034 8821 3035 8820
      3036 8822 3051 8834 3052 8821 3053 8808
      3052 8808 3051 8809 3037 8810 3030 8814
TIME...MOT...LOC 1954Z 291DEG 18KT 3051 8818 3047 8821
          3043 8818 3040 8821 3035 8833

$$

623 
WWUS54 KMOB 282019
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
319 PM CDT WED SEP 28 2011

ALC097-282030-
/O.CON.KMOB.SV.W.0218.000000T0000Z-110928T2030Z/
MOBILE AL-
319 PM CDT WED SEP 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR SOUTH CENTRAL MOBILE COUNTY...

AT 318 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 8 MILES 
SOUTHEAST OF THEODORE TO 7 MILES NORTHEAST OF DAUPHIN ISLAND TO 
DAUPHIN ISLAND...MOVING EAST AT 20 MPH.

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

LAT...LON 3032 8816 3031 8819 3034 8821 3035 8820
      3039 8817 3043 8820 3048 8820 3048 8809
      3037 8810 3030 8814
TIME...MOT...LOC 2019Z 291DEG 16KT 3045 8809 3041 8812
          3036 8812 3033 8813 3030 8817

$$

060 
WWUS54 KMOB 282029
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
329 PM CDT WED SEP 28 2011

ALC097-282039-
/O.EXP.KMOB.SV.W.0218.000000T0000Z-110928T2030Z/
MOBILE AL-
329 PM CDT WED SEP 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MOBILE COUNTY
WILL EXPIRE AT 330 PM CDT...

THE THUNDERSTORM HAS MOVED INTO THE COASTAL WATERS AND HAS SINCE 
FALLEN BELOW SEVERE LIMITS.

LAT...LON 3032 8816 3031 8819 3034 8821 3035 8820
      3039 8817 3043 8820 3048 8820 3048 8809
      3037 8810 3030 8814
TIME...MOT...LOC 2029Z 291DEG 16KT 3043 8804 3039 8807
          3034 8807 3031 8808 3028 8812

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 7:27 AM CDT	Severe Thunderstorm Warning	MOB	Covington, Crenshaw	48 min
Sep 28, 8:28 AM CDT	Special Marine Warning	MOB		62 min
Sep 28, 9:03 AM CDT	Areal Flood Advisory	MOB	Butler, Conecuh, Covington, Monroe, Wilcox	3 hr
Sep 28, 9:20 AM CDT	Special Marine Warning	MOB		115 min
Sep 28, 9:29 AM CDT	Special Marine Warning	MOB		31 min
Sep 28, 11:13 AM CDT	Special Marine Warning	MOB		47 min
Sep 28, 1:35 PM CDT	Special Marine Warning	MOB		115 min
Sep 28, 1:48 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	35 min
Sep 28, 1:56 PM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	3 hr
Sep 28, 2:43 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	25 min
Sep 28, 3:16 PM CDT	Areal Flood Warning	MOB	Mobile	2 hr
Sep 28, 3:26 PM CDT	Special Marine Warning	MOB		64 min
Sep 28, 3:34 PM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile, Washington	3 hr
Sep 28, 4:16 PM CDT	Special Marine Warning	MOB		59 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.