Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 195, NWS Mobile, AL

September 4, 2012Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 4, 2012, 6:37 PM CDT for Baldwin County, Alabama. It was in force for 30 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 4, 2012, 6:37 PM CDT (23:37 UTC)
Expired
Sep 4, 2012, 7:07 PM CDT
In force
30 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 57 km from the middle of the area, began a volume at 23:37 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, 11.6 hours before the alert went out and 182 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 2012-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1547 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 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
1547 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
675 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
-0.2
Supercell composite
-1.5

Open this sounding in Storm Lab

The text

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

227 
WUUS54 KMOB 042337
SVRMOB
ALC003-050030-
/O.NEW.KMOB.SV.W.0195.120904T2337Z-120905T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
637 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 730 PM CDT

* AT 632 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED NEAR LOXLEY...OR 5 MILES NORTH OF
  SILVERHILL...AND MOVING SOUTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GULF SHORES...        SUMMERDALE...         SILVERHILL...
  ROBERTSDALE...        MAGNOLIA SPRINGS...   LOXLEY...
  FOLEY...              ELBERTA...            BON SECOUR...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 39 AND 53.

LAT...LON 3022 8789 3024 8789 3026 8782 3026 8780
      3028 8777 3030 8777 3039 8788 3073 8786
      3072 8761 3026 8758 3022 8780 3022 8788
TIME...MOT...LOC 2337Z 359DEG 25KT 3058 8773

$$
1 follow-up statement
415 
WWUS54 KMOB 050007
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
707 PM CDT TUE SEP 4 2012

ALC003-050018-
/O.CAN.KMOB.SV.W.0195.000000T0000Z-120905T0030Z/
BALDWIN AL-
707 PM CDT TUE SEP 4 2012

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

AT 705 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR SOUTHERN
BALDWIN COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3022 8789 3024 8789 3026 8782 3026 8780
      3028 8777 3030 8777 3039 8788 3073 8786
      3072 8761 3026 8758 3022 8780 3022 8788
TIME...MOT...LOC 0008Z 359DEG 25KT 3036 8773

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 6:52 AM CDTAreal Flood AdvisoryMOBButler, Crenshaw3 hr
Sep 4, 7:20 AM CDTAreal Flood AdvisoryMOBCovington3 hr
Sep 4, 7:30 AM CDTFlash Flood WarningMOBButler, Crenshaw6 hr
Sep 4, 8:12 AM CDTFlash Flood WatchMOBButler, Clarke, Conecuh, Covington, Crenshaw, Escambia and 2 more25 hr
Sep 4, 8:26 AM CDTFlash Flood WarningMOBButler, Covington, Crenshaw6 hr
Sep 4, 9:10 AM CDTFlash Flood WarningMOBWilcox6 hr
Sep 4, 10:13 AM CDTAreal Flood AdvisoryMOBClarke, Conecuh, Monroe3 hr
Sep 4, 11:40 AM CDTFlash Flood WarningMOBButler, Conecuh, Monroe3 hr
Sep 4, 1:33 PM CDTAreal Flood WarningMOBButler, Crenshaw3 hr
Sep 4, 2:14 PM CDTAreal Flood WarningMOBButler, Conecuh, Covington, Crenshaw, Monroe, Wilcox2 hr
Sep 4, 3:34 PM CDTFlash Flood WarningMOBBaldwin, Clarke, Conecuh, Escambia, Monroe6 hr
Sep 4, 3:44 PM CDTSevere Thunderstorm WarningMOBBaldwin, Escambia61 min
Sep 4, 4:26 PM CDTAreal Flood WarningMOBConecuh, Monroe8 hr
Sep 4, 4:44 PM CDTSevere Thunderstorm WarningMOBBaldwin61 min
Sep 4, 4:59 PM CDTSevere Thunderstorm WarningMOBBaldwin, Escambia61 min
Sep 4, 5:51 PM CDTSevere Thunderstorm WarningMOBBaldwin54 min
Sep 4, 5:56 PM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke, Monroe, Washington, Wilcox64 min
Sep 4, 6:49 PM CDTSevere Thunderstorm WarningMOBBaldwin, Choctaw, Clarke, Escambia, Mobile, Monroe and 2 more34 min

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.