Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 52, NWS Mobile, AL

April 16, 2011Crenshaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 16, 2011, 12:11 AM CDT for Crenshaw County, Alabama. It was in force for 32 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: Apr 16, 2011, 12:11 AM CDT (05:11 UTC)
Expired: Apr 16, 2011, 12:43 AM CDT
In force: 32 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Crenshaw County, AL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 15, 7:48 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 5.2 hours before the alert went out and 236 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: 406 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1138 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 373 m²/s²
0-3 km storm-relative helicity: 566 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 11.3

Open this sounding in Storm Lab

The text

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

316 
WUUS54 KMOB 160511
SVRMOB
ALC041-160600-
/O.NEW.KMOB.SV.W.0052.110416T0511Z-110416T0600Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1211 AM CDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CRENSHAW COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 100 AM CDT

* AT 1210 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 11 MILES SOUTHEAST OF FORT
  DEPOSIT...OR 13 MILES WEST OF PETREY...AND MOVING EAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LAPINE...HELICON AND BRADLEYTON AROUND 1220 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT SATURDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3187 8618 3179 8645 3181 8645 3185 8644
      3186 8645 3198 8645 3198 8642 3200 8641
      3204 8630 3198 8629 3197 8618 3194 8617
TIME...MOT...LOC 0511Z 250DEG 42KT 3191 8637

$$

1 follow-up statement

736 
WWUS54 KMOB 160543
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1243 AM CDT SAT APR 16 2011

ALC041-160554-
/O.CAN.KMOB.SV.W.0052.000000T0000Z-110416T0600Z/
CRENSHAW AL-
1243 AM CDT SAT APR 16 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CRENSHAW COUNTY IS
CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT SATURDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3187 8618 3179 8645 3181 8645 3185 8644
      3186 8645 3198 8645 3198 8642 3200 8641
      3204 8630 3198 8629 3197 8618 3194 8617
TIME...MOT...LOC 0544Z 250DEG 42KT 3204 8594

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 7:14 PM CDT	Tornado Warning	MOB	Washington	36 min
Apr 15, 7:24 PM CDT	Tornado Warning Emergency	MOB	Mobile, Washington	51 min
Apr 15, 7:36 PM CDT	Severe Thunderstorm Warning	MOB	Wilcox	39 min
Apr 15, 7:39 PM CDT	Tornado Warning	MOB	Clarke, Monroe, Wilcox	29 min
Apr 15, 7:54 PM CDT	Tornado Warning	MOB	Clarke, Monroe, Wilcox	51 min
Apr 15, 8:11 PM CDT	Tornado Warning Emergency	MOB	Washington	49 min
Apr 15, 8:28 PM CDT	Tornado Warning	MOB	Washington	47 min
Apr 15, 8:50 PM CDT	Tornado Warning	MOB	Baldwin, Clarke, Escambia, Mobile, Monroe, Washington	55 min
Apr 15, 9:15 PM CDT	Severe Thunderstorm Warning	MOB	Clarke, Mobile, Washington	45 min
Apr 15, 9:18 PM CDT	Flash Flood Warning	MOB	Washington	117 min
Apr 15, 9:38 PM CDT	Tornado Warning	MOB	Conecuh, Monroe	52 min
Apr 15, 9:41 PM CDT	Tornado Warning	MOB	Clarke, Washington	49 min
Apr 15, 9:59 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Mobile, Monroe, Washington	61 min
Apr 15, 10:05 PM CDT	Tornado Warning	MOB	Baldwin, Clarke, Mobile, Monroe, Washington	55 min
Apr 15, 10:24 PM CDT	Tornado Warning	MOB	Butler, Clarke, Conecuh, Monroe, Wilcox	51 min
Apr 15, 10:32 PM CDT	Tornado Warning	MOB	Baldwin, Mobile	33 min
Apr 15, 10:56 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Conecuh, Escambia, Mobile, Monroe	64 min
Apr 15, 10:59 PM CDT	Tornado Warning	MOB	Baldwin, Conecuh, Escambia, Monroe	61 min
Apr 15, 11:10 PM CDT	Tornado Warning	MOB	Butler, Crenshaw	16 min
Apr 15, 11:33 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Crenshaw	42 min
Apr 15, 11:45 PM CDT	Tornado Warning	MOB	Conecuh, Covington, Escambia	60 min
Apr 16, 12:00 AM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw	60 min
Apr 16, 12:38 AM CDT	Tornado Warning	MOB	Covington	52 min
Apr 16, 1:01 AM CDT	Severe Thunderstorm Warning	MOB	Covington	33 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every 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.