Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 53, NWS Mobile, AL

April 16, 2011Covington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 16, 2011, 1:01 AM CDT for Covington County, Alabama. It was in force for 33 min. 1 report 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: Apr 16, 2011, 1:01 AM CDT (06:01 UTC)
Expired: Apr 16, 2011, 1:34 AM CDT
In force: 33 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Covington County, AL

The radar

The Eglin Afb radar (KEVX), 76 km from the middle of the area, began a volume at 06:05 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.

What was reported inside it

Time	Report	Where	Remark
Apr 16, 1:20 AM CDT	HAIL 0.88	4 E Opp, AL	NICKEL SIZED HAIL REPORTED 4 MILES EAST OF OPP...BY HAM OPERATOR.

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

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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 6.0 hours before the alert went out and 211 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1577 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 78 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.

215 
WUUS54 KMOB 160601
SVRMOB
ALC039-160645-
/O.NEW.KMOB.SV.W.0053.110416T0601Z-110416T0645Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 145 AM CDT

* AT 100 AM 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 7 MILES
  SOUTHEAST OF ANDALUSIA...OR NEAR LIBERTYVILLE...AND MOVING EAST AT
  50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HORN
  HILL AND ONYCHA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT FOR THE WARNED 
AREA. 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.

&&

LAT...LON 3108 8619 3108 8663 3126 8656 3129 8618
      3117 8618
TIME...MOT...LOC 0601Z 257DEG 41KT 3122 8642

$$

1 follow-up statement

214 
WWUS54 KMOB 160634
SVSMOB

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

ALC039-160644-
/O.CAN.KMOB.SV.W.0053.000000T0000Z-110416T0645Z/
COVINGTON AL-
134 AM CDT SAT APR 16 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN COVINGTON COUNTY IS
CANCELLED...

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

LAT...LON 3108 8619 3108 8663 3126 8656 3129 8618
      3117 8618
TIME...MOT...LOC 0634Z 257DEG 41KT 3130 8599

$$

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, 12:11 AM CDT	Severe Thunderstorm Warning	MOB	Crenshaw	32 min
Apr 16, 12:38 AM CDT	Tornado Warning	MOB	Covington	52 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.