Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 30, NWS Mobile, AL

March 13, 2012Butler County, Conecuh County, Covington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 13, 2012, 4:34 PM CDT for Butler County, Conecuh County, Covington County, Alabama. It was in force for 26 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 13, 2012, 4:34 PM CDT (21:34 UTC)
Expired: Mar 13, 2012, 5:00 PM CDT
In force: 26 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Butler County, AL, Conecuh County, AL, Covington County, AL

What was reported inside it

Time	Report	Where	Remark
Mar 13, 5:06 PM CDT	HAIL 0.5	South, AL	DIME SIZED HAIL REPORTED NEAR SOUTH IN COVINGTON COUNTY
Mar 13, 5:06 PM CDT	HAIL 0.88	Mckenzie, AL	NICKEL SIZE HAIL REPORTED BY PUBLIC NEAR MCKENZIE. REPORTED THROUGH WSFA TV.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.6 hours before the alert went out and 190 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: 984 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 470 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

074 
WUUS54 KMOB 132134
SVRMOB
ALC013-035-039-132200-
/O.NEW.KMOB.SV.W.0030.120313T2134Z-120313T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
434 PM CDT TUE MAR 13 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL BUTLER COUNTY IN SOUTH CENTRAL ALABAMA...
  EAST CENTRAL CONECUH COUNTY IN SOUTH CENTRAL ALABAMA...
  NORTHWESTERN COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 500 PM CDT

* AT 430 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 11
  MILES EAST OF EVERGREEN...OR NEAR SHREVE...AND MOVING EAST AT 15
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  MCKENZIE...           SHREVE...             RED LEVEL...
  GANTT...

&&

LAT...LON 3137 8648 3135 8680 3152 8684 3159 8650
      3157 8649 3157 8650 3152 8649
TIME...MOT...LOC 2135Z 261DEG 15KT 3145 8671

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 13, 2:20 AM CDT	Marine Dense Fog Advisory	MOB		9 hr
Mar 13, 2:29 AM CDT	Dense Fog Advisory	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more	7 hr
Mar 13, 1:38 PM CDT	Areal Flood Advisory	MOB	Baldwin	52 min
Mar 13, 3:46 PM CDT	Marine Dense Fog Advisory	MOB		19 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.