Alert archive / Florida / Tornado Warnings in 2011

Tornado Warning 28, NWS Mobile, AL

April 4, 2011Okaloosa County, Florida

NWS Mobile, AL issued this tornado warning at Apr 4, 2011, 11:01 PM CDT for Okaloosa County, Florida. It was in force for 14 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: Apr 4, 2011, 11:01 PM CDT (04:01 UTC)
Expired: Apr 4, 2011, 11:15 PM CDT
In force: 14 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 64 km from the middle of the area, began a volume at 04:03 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, 11:08 PM CDT	TSTM WND DMG	2 Se Laurel Hill, FL	TWO LARGE TREES BLOWN DOWN, ONE 3 FEET IN DIAMETER, WITH ROOFING SHINGLES DAMAGED TO SINGLE FAMILY RESIDENCE.
Apr 4, 11:13 PM CDT	TSTM WND DMG	8 E Crestview, FL	SKYWARN SPOTTER REPORTS PINE TREE DOWN ACROSS HWY 90...3 MILES WEST OF THE OKALOOSA AND WALTON COUNTY LINE. TIME ESTIMATED FROM RADAR.

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, 4.0 hours before the alert went out and 218 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.

150 
WFUS54 KMOB 050401
TORMOB
FLC091-050430-
/O.NEW.KMOB.TO.W.0028.110405T0401Z-110405T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1101 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITY OF CRESTVIEW...

* UNTIL 1130 PM CDT

* AT 1058 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  CRESTVIEW...OR 14 MILES SOUTHWEST OF LAUREL HILL...MOVING NORTHEAST
  AT 55 MPH.

* THE TORNADO WILL BE NEAR...
  LAUREL HILL AROUND 1110 PM CDT...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 54 AND 67.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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

&&

LAT...LON 3069 8660 3088 8667 3099 8651 3099 8638
      3072 8638
TIME...MOT...LOC 0401Z 246DEG 50KT 3084 8658

$$

2 follow-up statements

448 
WWUS54 KMOB 050406
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1106 PM CDT MON APR 4 2011

FLC091-050430-
/O.CON.KMOB.TO.W.0028.000000T0000Z-110405T0430Z/
OKALOOSA FL-
1106 PM CDT MON APR 4 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT FOR
NORTHEASTERN OKALOOSA COUNTY...

AT 1103 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS NEAR CAMPTON...OR ABOUT 7 MILES NORTH OF CRESTVIEW...
MOVING EAST AT 60 MPH.

THE SAFEST PLACE TO BE DURING A TORNADO IS ON THE LOWEST FLOOR OF A
STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY OR A ROOM SUCH AS
A CLOSET OR BATHROOM. IF POSSIBLE...GET UNDER A WORKBENCH OR OTHER
PIECE OF STURDY FURNITURE. USE BLANKETS OR PILLOWS TO COVER YOUR BODY
AND ALWAYS STAY AWAY FROM WINDOWS.

IF YOU ARE IN MOBILE HOME...EVACUATE IT AND GET ON THE LOWEST FLOOR
OF A NEARBY STURDY BUILDING OR IN AN UNDERGROUND STORM SHELTER. IF NO
SUBSTANTIAL SHELTER IS AVAILABLE AND A TORNADO IS FAST APPROACHING...
SEEK SHELTER IN A CULVERT...OR LIE FLAT IN THE NEAREST DITCH OR OTHER
LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTH CENTRAL ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3069 8660 3087 8655 3099 8649 3099 8638
      3072 8638
TIME...MOT...LOC 0406Z 249DEG 56KT 3087 8648

$$

977 
WWUS54 KMOB 050415
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1115 PM CDT MON APR 4 2011

FLC091-050425-
/O.CAN.KMOB.TO.W.0028.000000T0000Z-110405T0430Z/
OKALOOSA FL-
1115 PM CDT MON APR 4 2011

...THE TORNADO WARNING FOR NORTHEASTERN OKALOOSA COUNTY IS
CANCELLED...

THE PARENT THUNDERSTORM HAS SINCE MOVED EAST OF OKALOOSA COUNTY 
FLORIDA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTH CENTRAL ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3069 8660 3087 8655 3099 8649 3099 8638
      3072 8638
TIME...MOT...LOC 0415Z 249DEG 56KT 3092 8633

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 9:44 PM CDT	Severe Thunderstorm Warning	MOB	Escambia, Okaloosa, Santa Rosa	61 min
Apr 4, 10:46 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	44 min
Apr 4, 11:30 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa	15 min

Nearby

Tornado Warnings in Florida, 2011 Every tornado warning in 2011 Tornadoes 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.