Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 193, NWS Mobile, AL

September 4, 20125 counties in Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 4, 2012, 5:56 PM CDT for 5 counties in Alabama. It was in force for 64 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, 5:56 PM CDT (22:56 UTC)
Expired: Sep 4, 2012, 7:00 PM CDT
In force: 64 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Choctaw County, AL, Clarke County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL

The radar

The Mobile radar (KMOB), 146 km from the middle of the area, began a volume at 22:58 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

Birmingham, AL (KBMX), launched 12:00Z, 10.9 hours before the alert went out and 173 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: 1659 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 531 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 26 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.

458 
WUUS54 KMOB 042256
SVRMOB
ALC023-025-099-129-131-050000-
/O.NEW.KMOB.SV.W.0193.120904T2256Z-120905T0000Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MONROE COUNTY IN SOUTH CENTRAL ALABAMA...
  SOUTHWESTERN WILCOX COUNTY IN SOUTH CENTRAL ALABAMA...
  SOUTHERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  CLARKE COUNTY IN SOUTHWEST ALABAMA...
  NORTHERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 700 PM CDT

* AT 553 PM CDT...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  DAMAGING WINDS OVER 60 MPH WERE LOCATED ALONG A LINE EXTENDING FROM
  7 MILES SOUTHWEST OF BUTLER TO 12 MILES NORTHEAST OF THOMASVILLE...
  AND MOVING SOUTH AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TOXEY...              SILAS...              NEEDHAM...
  GILBERTOWN...         YELLOW BLUFF...       PINE HILL...
  WHATLEY...            THOMASVILLE...        JACKSON...

LAT...LON 3208 8805 3206 8807 3205 8811 3201 8811
      3199 8806 3200 8768 3201 8763 3207 8762
      3206 8744 3149 8747 3152 8841 3209 8839
TIME...MOT...LOC 2256Z 002DEG 21KT 3199 8829 3197 8755

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 6:52 AM CDT	Areal Flood Advisory	MOB	Butler, Crenshaw	3 hr
Sep 4, 7:20 AM CDT	Areal Flood Advisory	MOB	Covington	3 hr
Sep 4, 7:30 AM CDT	Flash Flood Warning	MOB	Butler, Crenshaw	6 hr
Sep 4, 8:12 AM CDT	Flash Flood Watch	MOB	Butler, Clarke, Conecuh, Covington, Crenshaw, Escambia and 2 more	25 hr
Sep 4, 8:26 AM CDT	Flash Flood Warning	MOB	Butler, Covington, Crenshaw	6 hr
Sep 4, 9:10 AM CDT	Flash Flood Warning	MOB	Wilcox	6 hr
Sep 4, 10:13 AM CDT	Areal Flood Advisory	MOB	Clarke, Conecuh, Monroe	3 hr
Sep 4, 11:40 AM CDT	Flash Flood Warning	MOB	Butler, Conecuh, Monroe	3 hr
Sep 4, 1:33 PM CDT	Areal Flood Warning	MOB	Butler, Crenshaw	3 hr
Sep 4, 2:14 PM CDT	Areal Flood Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Monroe, Wilcox	2 hr
Sep 4, 3:34 PM CDT	Flash Flood Warning	MOB	Baldwin, Clarke, Conecuh, Escambia, Monroe	6 hr
Sep 4, 3:44 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Escambia	61 min
Sep 4, 4:26 PM CDT	Areal Flood Warning	MOB	Conecuh, Monroe	8 hr
Sep 4, 4:44 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	61 min
Sep 4, 4:59 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Escambia	61 min
Sep 4, 5:51 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	54 min
Sep 4, 6:37 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	30 min
Sep 4, 6:49 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Choctaw, Clarke, Escambia, Mobile, Monroe and 2 more	34 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every 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.