Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 7, NWS Mobile, AL

February 1, 2011Okaloosa County, Santa Rosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Feb 1, 2011, 6:08 PM CST for Okaloosa County, Santa Rosa County, Florida. It was in force for 52 min. 4 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 1, 2011, 6:08 PM CST (00:08 UTC)
Expired: Feb 1, 2011, 7:00 PM CST
In force: 52 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 102 km from the middle of the area, began a volume at 00:08 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 1, 6:19 PM CST	TSTM WND DMG	4 Ne Allentown, FL	TREES DOWN COVERING ROAD.
Feb 1, 6:33 PM CST	TSTM WND DMG	2 Sse Milton Near Whiti, FL	TREES DOWN COVERING ROAD.
Feb 1, 6:37 PM CST	TSTM WND DMG	4 E Pace, FL	TREES DOWN COVERING ROAD.
Feb 1, 6:51 PM CST	TSTM WND DMG	3 W Bagdad, FL	LARGE TREE BLOWN DOWN ACROSS HOUSE

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 1, 1:03 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 0.1 hours before the alert went out and 258 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: 64 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 453 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 326 m²/s²
0-3 km storm-relative helicity: 355 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.

519 
WUUS54 KMOB 020008
SVRMOB
FLC091-113-020100-
/O.NEW.KMOB.SV.W.0007.110202T0008Z-110202T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
608 PM CST TUE FEB 1 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITY OF CRESTVIEW...
  SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITIES OF...PACE...MILTON...BAGDAD...

* UNTIL 700 PM CST

* AT 608 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES NORTH OF PACE...OR 14
  MILES NORTH OF AVALON BEACH...AND MOVING EAST AT 75 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CRESTVIEW AROUND 635 PM CST...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 24 AND 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CST TUESDAY EVENING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3059 8640 3055 8701 3056 8701 3054 8714
      3057 8715 3058 8717 3056 8717 3057 8719
      3074 8727 3089 8727 3099 8717 3099 8638
TIME...MOT...LOC 0008Z 267DEG 64KT 3072 8711

$$

1 follow-up statement

983 
WWUS54 KMOB 020038
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
638 PM CST TUE FEB 1 2011

FLC091-113-020100-
/O.CON.KMOB.SV.W.0007.000000T0000Z-110202T0100Z/
OKALOOSA FL-SANTA ROSA FL-
638 PM CST TUE FEB 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CST
FOR EASTERN SANTA ROSA AND OKALOOSA COUNTIES...

AT 638 PM CST...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS OVER 60
MPH.  THIS STORM WAS NEAR CANNON TOWN...OR ABOUT 11 MILES NORTHWEST
OF CRESTVIEW...MOVING EAST AT 50 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PEADEN...CLEAR SPRINGS...BLACKMAN AND ESCAMBIA FARMS AROUND 645 PM
  CST...
  OAK GROVE...CAMPTON AND GARDEN CITY AROUND 650 PM CST...
  LAUREL HILL AND OKALOO AROUND 655 PM CST...
  SVEA AROUND 700 PM CST...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CST TUESDAY EVENING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA. A TORNADO WATCH ALSO
REMAINS IN EFFECT UNTIL 1100 PM CST TUESDAY EVENING FOR SOUTH CENTRAL
ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3055 8714 3078 8701 3090 8692 3098 8683
      3099 8638 3059 8640 3055 8701 3056 8701
TIME...MOT...LOC 0038Z 255DEG 44KT 3087 8670

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 1, 6:38 PM CST	Severe Thunderstorm Warning	MOB	Okaloosa	52 min

Nearby

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.