Alert archive / Florida / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 42, NWS Mobile, AL
NWS Mobile, AL issued this severe thunderstorm warning at Apr 4, 2011, 11:30 PM CDT for Okaloosa County, Florida. It was in force for 15 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2011, 11:30 PM CDT (04:30 UTC)
- Expired
- Apr 4, 2011, 11:45 PM CDT
- In force
- 15 min
- Issued by
- NWS Mobile, AL
- Area
- Storm-based polygon
County Okaloosa County, FL
The radar
The Eglin Afb radar (KEVX), 57 km from the middle of the area, began a volume at 04:33 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.
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, 4.5 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
654
WUUS54 KMOB 050430
SVRMOB
FLC091-050445-
/O.NEW.KMOB.SV.W.0042.110405T0430Z-110405T0445Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1130 PM CDT MON APR 4 2011
THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...
THIS INCLUDES THE CITIES OF...LAKE LORRAINE...WRIGHT...
VALPARAISO...OCEAN CITY...NICEVILLE...MARY ESTHER...FORT WALTON
BEACH...EGLIN AFB...DESTIN...
* UNTIL 1145 PM CDT
* AT 1128 PM CDT...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 10 MILES WEST OF DE FUNIAK SPRINGS TO 7 MILES SOUTHEAST OF
FORT WALTON BEACH...AND MOVING SOUTHEAST AT 40 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
VILLA TASSO AROUND 1135 PM CDT...
OTHERWISE EXTREME SOUTHEASTERN PORTION OF OKALOOSA COUNTY
THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 58 AND 67.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTH CENTRAL ALABAMA AND NORTHWEST FLORIDA.
&&
LAT...LON 3040 8673 3043 8672 3097 8639 3047 8638
3046 8639 3048 8641 3048 8643 3049 8645
3046 8653 3043 8655 3043 8658 3040 8651
3042 8645 3042 8640 3039 8638
TIME...MOT...LOC 0429Z 304DEG 30KT 3075 8627 3031 8657
$$1 follow-up statement
997
WWUS54 KMOB 050442
SVSMOB
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1142 PM CDT MON APR 4 2011
FLC091-050451-
/O.EXP.KMOB.SV.W.0042.000000T0000Z-110405T0445Z/
OKALOOSA FL-
1142 PM CDT MON APR 4 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OKALOOSA COUNTY
WILL EXPIRE AT 1145 PM CDT...
THE LINE OF SEVERE THUNDERSTORMS WILL EXIT EXTREME SOUTHEASTERN
OKALOOSA COUNTY BY 1145 PM CDT.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTH CENTRAL ALABAMA AND NORTHWEST FLORIDA. ONCE THE
THUNDERSTORM LINE PASSES...THE TORNADO WATCH WILL BE CANCELED.
LAT...LON 3040 8673 3043 8672 3097 8639 3047 8638
3046 8639 3048 8641 3048 8643 3049 8645
3046 8653 3043 8655 3043 8658 3040 8651
3042 8645 3042 8640 3039 8638
TIME...MOT...LOC 0441Z 286DEG 30KT 3070 8620 3026 8650
$$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, 11:01 PM CDT | Tornado Warning | MOB | Okaloosa | 14 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.