Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 254, NWS Mobile, AL

August 18, 2000Okaloosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Aug 18, 2000, 5:43 PM CDT for Okaloosa County, Florida. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Aug 18, 2000, 5:43 PM CDT (22:43 UTC)
Expired: Aug 18, 2000, 6:30 PM CDT
In force: 47 min
Issued by: NWS Mobile, AL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Okaloosa County, FL

What was reported inside it

Time	Report	Where	Remark
Aug 18, 5:45 PM CDT	Hail 0.88	Dorcas, FL	A thunderstorm produced nickle sized hail near the community.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Eglin AFB/Valpar, FL (KVPS), launched 12:00Z, 10.7 hours before the alert went out and 34 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: 1794 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1253 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

651 
WUUS54 KMOB 182244
SVRMOB
FLC091-182330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
543 PM CDT FRI AUG 18 2000

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OKALOOSA COUNTY IN NORTHWEST FLORIDA

* UNTIL 630 PM CDT

* AT 543 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM OVER EXTREME EAST CENTRAL OKALOOSA           
  COUNTY...ABOUT 11 MILES NORTHEAST OF CRESTVIEW...MOVING SOUTHWEST AT   
  10 MPH.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE 
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE 
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MOBILE.

LAT...LON 3091 8638 3094 8648 3061 8664 3054 8639

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 4:22 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa	38 min
Aug 18, 4:55 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa	35 min
Aug 18, 5:12 PM CDT	Tornado Warning	MOB	Okaloosa	33 min
Aug 18, 5:48 PM CDT	Severe Thunderstorm Warning	MOB	Santa Rosa	42 min

Nearby

Severe Thunderstorm Warnings in Florida, 2000 Every severe thunderstorm warning in 2000

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.