Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 258, NWS Mobile, AL

August 19, 2000Okaloosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Aug 19, 2000, 6:12 PM CDT for Okaloosa County, Florida. It was in force for 33 min. No storm report in the archive falls 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.

The facts

Issued
Aug 19, 2000, 6:12 PM CDT (23:12 UTC)
Expired
Aug 19, 2000, 6:45 PM CDT
In force
33 min
Issued by
NWS Mobile, AL
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Okaloosa County, FL

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.2 hours before the alert went out and 205 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2000-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1194 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2000-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1194 J/kg
Mixed-layer CIN
-133 J/kg
Mixed-layer LCL
1282 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
83 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.

000 
WUUS54 KMOB 192317 COR
SVRMOB
FLC091-192345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED MOVEMENT...
NATIONAL WEATHER SERVICE MOBILE AL
612 PM CDT SAT AUG 19 2000

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 645 PM CDT

* AT 612 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM OVER SOUTHEAST OKALOOSA COUNTY...ABOUT 3     
  MILES NORTHEAST OF NICEVILLE.  THE STORM WAS MOVING SOUTHEAST AT 7 
  MPH.

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. THUEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MOBILE.

LAT...LON 3071 8639 3056 8654 3041 8639 3056 8639

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 3:05 PM CDT, 3 hours 7 minutes earlier.

Area forecast discussion, Aug 19, 3:05 PM CDT, 3 hours 7 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOBILE AL
305 PM CDT SAT AUG 19 2000

FAIRLY STRAIGHTFORWARD FORECAST AFTER LATE AFTERNOON/EARLY EVENING
CONVECTION FIRING ALONG SURFACE FRONT SUBSIDES.  MODELS SIMILAR IN
IN LARGE SCALE FEATURES AS UPPER HIGH REMAIN ANCHORED OVER THE SOUTH
CENTRAL PLAINS.  AVN MODEL BRINGING FRONT FURTHEST TO THE SOUTH AND
OFF THE COAST LATE TONIGHT.  NOT MUCH CHANGE IN DEWPOINTS NOTED
BEHIND FRONT.

WILL LEAVE SCATTERED POPS (30%) ACROSS THE FL COASTAL COUNTIES THIS
EVENING TO COVER ON GOING STORMS TO NORTH.  WIDELY SCATTERED COASTAL
ALABAMA COUNTIES.  NO PRECIP EXPECTED SHORTLY AFTER SUNSET WITH
MOSTLY CLEAR/PARTLY CLOUDY SKIES.  PARTLY CLOUDY AGAIN ON SUNDAY
WITH ONLY 20 PERCENT NEAR EXITING FRONT...COASTAL COUNTIES.
ISOLATED AFTERNOON THUNDERSTORMS INLAND WITH DIURNAL HEATING AND
MODERATE SURFACE DEWPOINTS.

TEMPERATURE GUIDANCE SIMILAR NEXT FOUR PERIODS AND WILL NOT DEVIATE
MUCH FROM THE GIVEN NUMBERS.  WILL GO SLIGHTLY WARMER OVERNIGHT DUE
TO SLOW MOVEMENT OF SURFACE FRONT.

MARINE/FIRE WEATHER...MODERATE W WINDS WILL PREVAIL AHEAD OF FRONT
PUSHING S THROUGH AL.  WINDS WILL BECOME MORE NLY LATE TONIGHT
AFTER FROPA.  THEN BECOMING SWLY SUN AFTERNOON AS SEABREEZE BECOMES
BETTER ESTABLISHED...AND MORE SLY ON MON.  NO SIGNIFICANT WX.
DESPITE FRONTAL PASSAGE TONIGHT...DEWPOINTS WILL REMAIN IN THE 65 TO
70 DEGREE RANGE THROUGH SUN AFTERNOON.  THIS SHOULD KEEP THE LOWER
RH VALUES ABOVE 40 PERCENT THROUGH THE PERIOD.

/22

PRELIMINARY NUMBERS...
MOB BB 072/095 072/094 073 2222-
PNS BB 076/096 076/092 074 2232-
DTS BB 078/095 077/091 074 2232-
GZH BB 072/094 072/091 0:71 22010
2R0 BB 071/094 071/094 071 22010
61A BB 072/093 072/091 071 22010

.MOB...
AL...NONE.
FL...NONE.
MS...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 4:24 PM CDTSevere Thunderstorm WarningMOBEscambia, Santa Rosa51 min
Aug 19, 6:44 PM CDTSevere Thunderstorm WarningMOBOkaloosa31 min

Nearby

Severe Thunderstorm Warnings in Florida, 2000Every 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; the sounding from the Mesonet's radiosonde archive.