Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 40, NWS Mobile, AL

April 4, 2011Baldwin County, Covington County, Escambia County, Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Apr 4, 2011, 9:44 PM CDT for Baldwin County, Covington County, Escambia County, Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 61 min. 6 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: Apr 4, 2011, 9:44 PM CDT (02:44 UTC)
Expired: Apr 4, 2011, 10:45 PM CDT
In force: 61 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Baldwin County, AL, Covington County, AL, Escambia County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 85 km from the middle of the area, began a volume at 02:45 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 4, 10:15 PM CDT	TSTM WND DMG	Muscogee, FL	ESCAMBIA COUNTY 911 REPORTED TREES AND POWER LINES DOWN NEAR JACKS BAYOU AND MUSCOGEE ROAD. ONE TREE IS REPORTED ON FIRE.
Apr 4, 10:17 PM CDT	HAIL 0.75	Chumuckla, FL	SANTA ROSA FIRE DEPT REPORTED DIME SIZE HAIL IN CHUMUCKLA.
Apr 4, 10:26 PM CDT	TSTM WND DMG	1 Wsw Pace, FL	SANTA ROSA FIRE DEPT REPORTS A TREE DOWN ON A MOBILE HOME ON DIAMOND STREET IN PACE. EIGHT PEOPLE ARE BEING EVACUATED FROM THE HOME.
Apr 4, 10:40 PM CDT	TSTM WND GST 53	Pensacola Regional A/P, FL	PENSACOLA REGIONAL AIRPORT REPORTED AT 53 MPH WIND GUST.
Apr 4, 10:47 PM CDT	TSTM WND DMG	2 Nne Brent, FL	TREE DOWN AT HILBURN ROAD AND CREIGHTON ROAD.
Apr 4, 10:47 PM CDT	TSTM WND GST 55	2 Nne Brent, FL	55 MPH WIND GUST NEAR HILBURN ROAD AND CREIGHTON ROAD.

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 4, 5:28 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.7 hours before the alert went out and 241 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: 1916 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 521 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

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

759 
WUUS54 KMOB 050244
SVRMOB
ALC003-039-053-FLC033-091-113-050345-
/O.NEW.KMOB.SV.W.0040.110405T0244Z-110405T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
ISSUED BY NATIONAL WEATHER SERVICE NEW ORLEANS LA
944 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ESCAMBIA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITY OF PENSACOLA...
  OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITIES OF...FORT WALTON BEACH...DESTIN...
  CRESTVIEW...
  SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITY OF NAVARRE...
  SOUTHERN COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...
  SOUTHEASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...
  THIS INCLUDES THE CITY OF BREWTON...
  SOUTHERN BALDWIN COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 1045 PM CDT

* AT 940 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS.  THESE STORMS WERE LOCATED ALONG A
  LINE EXTENDING FROM WAHL TO GASQUE...OR ALONG A LINE EXTENDING FROM
  11 MILES SOUTHWEST OF BREWTON TO 17 MILES EAST OF DAUPHIN ISLAND...
  AND MOVING EAST AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  OAK...KEEGO...ELBERTA...GULF SHORES...JAY...MIFLIN...MOLINO...EAST
  BREWTON...SEMINOLE...CHUMUCKLA...ROMAR BEACH...DIXONVILLE...
  BEULAH...CANTONMENT...COTTAGE HILL...ROCK HILL...ORANGE BEACH...
  PERDIDO BEACH...LILLIAN...GONZALEZ...BERRYDALE...ROBERTS...
  ENSLEY...MCLELLAN...BELLVIEW...JOHNSONS BEACH...ALLENTOWN...PACE...
  MYRTLE GROVE...FERRY PASS...PARKER SPRINGS...WEST PENSACOLA...
  BRENT...MILTON NEAR WHITING FIELD...BROWNSVILLE...GOULDING...
  WARRINGTON...PENSACOLA REGIONAL A/P...MUNSON...PENSACOLA NAVAL
  BASE...MILTON...DIXIE...EAST PENSACOLA HEIGHTS...BRADLEY...
  BAGDAD...GULF BREEZE...HAROLD...GOOD HOPE...FALCO...ESCAMBIA
  FARMS...ORIOLE BEACH...WING...BLACKMAN...CANNON TOWN...PEADEN...
  BAKER...GALLIVER...RED OAK...HOLT...MILLIGAN...LAUREL HILL...
  WATKINS BRIDGE...SVEA...CRESTVIEW AIRPORT...LOCKHART...FLORALA...
  STEDMAN...DORCAS...DEERLAND...WRIGHT...MARY ESTHER...HOWELLS...
  OCEAN CITY...VALPARAISO...POSTIL...NICEVILLE AND EGLIN AFB

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3023 8784 3029 8776 3032 8778 3116 8721
      3115 8618 3099 8619 3098 8638 3046 8638
      3046 8642 3049 8645 3044 8658 3042 8657
      3041 8652 3043 8646 3039 8638 3040 8674
TIME...MOT...LOC 0244Z 278DEG 49KT 3102 8718 3028 8776

$$

1 follow-up statement

520 
WWUS54 KMOB 050339
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1039 PM CDT MON APR 4 2011

ALC003-039-053-FLC033-091-113-050345-
/O.CON.KMOB.SV.W.0040.000000T0000Z-110405T0345Z/
ESCAMBIA AL-COVINGTON AL-BALDWIN AL-OKALOOSA FL-ESCAMBIA FL-
SANTA ROSA FL-
1039 PM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR SANTA ROSA...SOUTHEASTERN ESCAMBIA...OKALOOSA...EXTREME
SOUTHEASTERN BALDWIN...SOUTHERN COVINGTON AND SOUTHEASTERN ESCAMBIA
COUNTIES...

AT 1034 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT ON RADAR A LINE OF SEVERE THUNDERSTORMS.  THESE STORMS WERE
ALONG A LINE EXTENDING FROM DIXIE TO HAROLD TO WARRINGTON...OR ALONG
A LINE EXTENDING FROM 19 MILES SOUTHWEST OF ANDALUSIA TO 8 MILES EAST
OF MILTON TO WARRINGTON...MOVING EAST AT 55 MPH.

THESE STORMS PRODUCED DIME SIZED HAIL WHILE MOVING OVER CHUMUCKLA 
FLORIDA.

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS
RESULTING IN SERIOUS INJURY OR PROPERTY DAMAGE. PEOPLE OUTSIDE SHOULD
MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING AWAY FROM
WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE LOWEST
FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY OR A
ROOM SUCH AS A CLOSET OR BATHROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3031 8749 3058 8735 3069 8715 3116 8694
      3115 8618 3099 8619 3098 8638 3046 8638
      3046 8642 3049 8645 3044 8658 3042 8657
      3041 8652 3043 8646 3039 8638 3040 8674
TIME...MOT...LOC 0338Z 278DEG 49KT 3112 8666 3066 8686
          3038 8723

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 7:05 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	55 min
Apr 4, 7:08 PM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	67 min
Apr 4, 7:30 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Mobile, Washington, Wilcox	60 min
Apr 4, 7:38 PM CDT	Tornado Warning	MOB	Washington	56 min
Apr 4, 7:54 PM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	53 min
Apr 4, 8:21 PM CDT	Tornado Warning	MOB	Clarke, Monroe, Washington	39 min
Apr 4, 8:30 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Butler, Clarke, Conecuh, Escambia, Mobile and 3 more	60 min
Apr 4, 9:41 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia	64 min
Apr 4, 9:47 PM CDT	Special Marine Warning	MOB		88 min
Apr 4, 10:46 PM CDT	Severe Thunderstorm Warning	MOB	Covington	44 min
Apr 4, 11:36 PM CDT	Special Marine Warning	MOB		84 min
Apr 5, 5:09 AM CDT	Fire Weather Watch	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia, Monroe and 1 more	25 hr
Apr 4, 11:01 PM CDT	Tornado Warning	MOB	Okaloosa	14 min
Apr 4, 11:30 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa	15 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Severe Thunderstorm Warnings in Florida, 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.