Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 192, NWS Mobile, AL

September 4, 2012Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 4, 2012, 5:51 PM CDT for Baldwin County, Alabama. It was in force for 54 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, 5:51 PM CDT (22:51 UTC)
Expired
Sep 4, 2012, 6:45 PM CDT
In force
54 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 22:53 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, 10.9 hours before the alert went out and 198 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.

572 
WUUS54 KMOB 042251
SVRMOB
ALC003-042345-
/O.NEW.KMOB.SV.W.0192.120904T2251Z-120904T2345Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 645 PM CDT

* AT 548 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED 4 MILES EAST OF BAY MINETTE...OR 7
  MILES SOUTHEAST OF I65 AND AL 287...AND MOVING SOUTH AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  STAPLETON...          SILVERHILL...         ROBERTSDALE...
  LOXLEY...             BAY MINETTE...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 38 AND 53.

LAT...LON 3052 8790 3095 8784 3093 8761 3087 8763
      3084 8762 3083 8760 3049 8761
TIME...MOT...LOC 2251Z 004DEG 19KT 3086 8771

$$
1 follow-up statement
018 
WWUS54 KMOB 042318
SVSMOB

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

ALC003-042345-
/O.CON.KMOB.SV.W.0192.000000T0000Z-120904T2345Z/
BALDWIN AL-
618 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR CENTRAL BALDWIN COUNTY...

AT 613 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
WINDS OVER 60 MPH WAS LOCATED 9 MILES NORTH OF LOXLEY...OR 4 MILES
EAST OF STAPLETON...MOVING SOUTH AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  STAPLETON...          SILVERHILL...         ROBERTSDALE...
  LOXLEY...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 38 AND 53.

LAT...LON 3052 8790 3087 8784 3087 8763 3084 8762
      3083 8760 3049 8761
TIME...MOT...LOC 2318Z 004DEG 19KT 3072 8772

$$

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, 5:56 PM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke, Monroe, Washington, Wilcox64 min
Sep 4, 6:37 PM CDTSevere Thunderstorm WarningMOBBaldwin30 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.