Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 217, NWS Mobile, AL

September 28, 2011Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 28, 2011, 2:43 PM CDT for Baldwin County, Alabama. It was in force for 25 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, 2:43 PM CDT (19:43 UTC)
Expired
Sep 28, 2011, 3:08 PM CDT
In force
25 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 66 km from the middle of the area, began a volume at 19:45 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, 7.7 hours before the alert went out and 211 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 2011-09-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3518 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 2011-09-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 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
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.

797 
WUUS54 KMOB 281943
SVRMOB
ALC003-282030-
/O.NEW.KMOB.SV.W.0217.110928T1943Z-110928T2030Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 330 PM CDT

* AT 241 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 3 MILES
  NORTH OF LOXLEY...OR 6 MILES SOUTHEAST OF STAPLETON...AND MOVING
  EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LOXLEY...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 43 AND 62.

&&

LAT...LON 3059 8779 3072 8780 3076 8753 3074 8753
      3068 8741 3064 8739 3061 8740 3060 8741
      3058 8741
TIME...MOT...LOC 1943Z 258DEG 12KT 3067 8774

$$
2 follow-up statements
979 
WWUS54 KMOB 282000
SVSMOB

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

ALC003-282030-
/O.CON.KMOB.SV.W.0217.000000T0000Z-110928T2030Z/
BALDWIN AL-
300 PM CDT WED SEP 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR EAST CENTRAL BALDWIN COUNTY...

AT 255 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 ROSINTON...OR NEAR LOXLEY...MOVING EAST AT 10 MPH.

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

LAT...LON 3061 8774 3070 8774 3072 8750 3068 8741
      3064 8739 3061 8740 3060 8741 3058 8741
TIME...MOT...LOC 2000Z 265DEG 11KT 3065 8768

$$
008 
WWUS54 KMOB 282008
SVSMOB

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

ALC003-282018-
/O.CAN.KMOB.SV.W.0217.000000T0000Z-110928T2030Z/
BALDWIN AL-
308 PM CDT WED SEP 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BALDWIN COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS FALLEN BELOW SEVERE LIMITS.

LAT...LON 3061 8774 3070 8774 3072 8750 3068 8741
      3064 8739 3061 8740 3060 8741 3058 8741
TIME...MOT...LOC 2008Z 265DEG 11KT 3065 8765

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 28, 7:27 AM CDTSevere Thunderstorm WarningMOBCovington, Crenshaw48 min
Sep 28, 8:28 AM CDTSpecial Marine WarningMOB62 min
Sep 28, 9:03 AM CDTAreal Flood AdvisoryMOBButler, Conecuh, Covington, Monroe, Wilcox3 hr
Sep 28, 9:20 AM CDTSpecial Marine WarningMOB115 min
Sep 28, 9:29 AM CDTSpecial Marine WarningMOB31 min
Sep 28, 11:13 AM CDTSpecial Marine WarningMOB47 min
Sep 28, 1:35 PM CDTSpecial Marine WarningMOB115 min
Sep 28, 1:48 PM CDTSevere Thunderstorm WarningMOBMobile35 min
Sep 28, 1:56 PM CDTAreal Flood AdvisoryMOBBaldwin, Mobile3 hr
Sep 28, 2:49 PM CDTSevere Thunderstorm WarningMOBBaldwin, Mobile41 min
Sep 28, 3:16 PM CDTAreal Flood WarningMOBMobile2 hr
Sep 28, 3:26 PM CDTSpecial Marine WarningMOB64 min
Sep 28, 3:34 PM CDTAreal Flood AdvisoryMOBBaldwin, Mobile, Washington3 hr
Sep 28, 4:16 PM CDTSpecial Marine WarningMOB59 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.