Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 18, NWS Mobile, AL

February 18, 2012Escambia County, Santa Rosa County, Florida; Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Feb 18, 2012, 4:59 PM CST for Escambia County, Santa Rosa County, Florida; Baldwin County, Alabama. It was in force for 76 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: Feb 18, 2012, 4:59 PM CST (22:59 UTC)
Expired: Feb 18, 2012, 6:15 PM CST
In force: 76 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

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

The radar

The Mobile radar (KMOB), 83 km from the middle of the area, began a volume at 23:01 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
Feb 18, 5:20 PM CST	TSTM WND DMG	3 Sw Seminole, AL	SEVERAL TREES DOWN WITH SOME STRUCTURAL DAMAGE TO A SHED AND A MOBILE HOME. DAMAGE WAS REPORTED IN THE CC ROAD AREA ON CACTUS COURT...JUST NORTH OF ELBERTA.
Feb 18, 5:40 PM CST	TSTM WND DMG	Lillian, AL	DAMAGE TO A BARN...PUMP HOUSE AND THE BACK PORCH OF A TRAILER

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
Feb 18, 11:49 AM CST	Tornado Watch	SPC	5 hr
Feb 18, 4:48 PM CST	Tornado Watch	SPC	4 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.0 hours before the alert went out and 220 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: 449 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 177 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.

384 
WUUS54 KMOB 182259
SVRMOB
ALC003-FLC033-113-190015-
/O.NEW.KMOB.SV.W.0018.120218T2259Z-120219T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
459 PM CST SAT FEB 18 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ESCAMBIA COUNTY IN NORTHWEST FLORIDA...
  SOUTHERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  SOUTHERN BALDWIN COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 615 PM CST

* AT 458 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 12 MILES SOUTHWEST OF CENTURY TO 5 MILES SOUTHEAST OF FAIRHOPE
  TO 9 MILES EAST OF DAUPHIN ISLAND...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WHITING FIELD...      WALLACE...            SPRINGHILL...
  SKYLINE...            ROEVILLE...           POINT BAKER...
  PEA RIDGE...          MULAT...              GARCON POINT...

THIS INCLUDES INTERSTATE 10 IN FLORIDA BETWEEN MILE MARKERS 1 AND 38.

THIS INCLUDES INTERSTATE 10 IN ALABAMA BETWEEN MILE MARKERS 46 AND
66.

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.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CST SUNDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3022 8804 3027 8794 3024 8787 3028 8777
      3046 8793 3085 8756 3085 8679 3074 8679
      3043 8710 3044 8711 3051 8710 3057 8717
      3047 8715 3038 8726 3033 8726 3039 8712
      3031 8719 3022 8780
TIME...MOT...LOC 2258Z 271DEG 42KT 3079 8749 3045 8781
          3021 8804

$$

JP/MB

1 follow-up statement

047 
WWUS54 KMOB 182343
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
543 PM CST SAT FEB 18 2012

ALC003-FLC033-113-190015-
/O.CON.KMOB.SV.W.0018.000000T0000Z-120219T0015Z/
SANTA ROSA FL-ESCAMBIA FL-BALDWIN AL-
543 PM CST SAT FEB 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CST
FOR SOUTHEASTERN BALDWIN...SOUTHEASTERN ESCAMBIA AND SOUTHERN SANTA
ROSA COUNTIES...

AT 543 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM 17 MILES NORTHEAST OF MILTON TO BELLVIEW TO GULF 
SHORES...MOVING EAST AT 50 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  NAVY POINT...WARD BASIN...EAST MILTON AND SANDERS BEACH BY 550 PM
  CST...
  PINE BLUFF...GARCON POINT AND DICKERSON CITY BY 555 PM CST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT 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.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 3085 8700 3085 8679 3074 8679 3043 8710
      3044 8711 3051 8710 3057 8717 3047 8715
      3038 8726 3033 8726 3039 8712 3031 8719
      3030 8723 3024 8766
TIME...MOT...LOC 2343Z 271DEG 42KT 3084 8682 3047 8722
          3021 8760

$$

JP/MB

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 18, 3:38 AM CST	Wind Advisory	MOB		38 hr
Feb 18, 3:13 PM CST	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	47 min
Feb 18, 3:37 PM CST	Flash Flood Warning	MOB	Escambia	113 min
Feb 18, 4:01 PM CST	Severe Thunderstorm Warning	MOB	Escambia, Okaloosa, Santa Rosa	44 min
Feb 18, 4:38 PM CST	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	52 min
Feb 18, 4:52 PM CST	Flash Flood Warning	MOB	Escambia	113 min
Feb 18, 5:13 PM CST	Flash Flood Warning	MOB	Escambia, Okaloosa, Santa Rosa	2 hr
Feb 18, 5:17 PM CST	Tornado Warning	MOB	Escambia	28 min
Feb 18, 1:56 PM CST	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	49 min
Feb 18, 2:28 PM CST	Flash Flood Warning	MOB	Mobile, Washington	32 days
Feb 18, 3:28 PM CST	Gale Warning	MOB		21 hr
Feb 18, 3:59 PM CST	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	61 min
Feb 18, 4:07 PM CST	Special Marine Warning	MOB		83 min
Feb 18, 4:19 PM CST	Flash Flood Warning	MOB	Baldwin, Mobile	116 min
Feb 18, 4:21 PM CST	Tornado Warning	MOB	Mobile	24 min
Feb 18, 4:25 PM CST	Areal Flood Advisory	MOB	Choctaw, Clarke, Monroe, Washington, Wilcox	2 hr
Feb 18, 4:30 PM CST	Flash Flood Warning	MOB	Mobile, Washington	60 min
Feb 18, 5:27 PM CST	Special Marine Warning	MOB		93 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 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; radar from the NEXRAD Level II archive.