Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 152, NWS Mobile, AL

May 4, 1998Okaloosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at May 4, 1998, 3:02 AM CDT for Okaloosa County, Florida. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 4, 1998, 3:02 AM CDT (08:02 UTC)
Expired
May 4, 1998, 4:00 AM CDT
In force
58 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Okaloosa County, FL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 4, 12:00 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 8.0 hours before the alert went out and 221 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 00:00Z on 1998-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 57 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 1998-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 137 square meters per square second.193958Sfc1 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
57 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
2063 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
137 m²/s²
0-3 km storm-relative helicity
208 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 
TTAA00 KMOB 040802 RRA
SVRMOB
FLC091-040900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
302 AM CDT MON MAY 4 1998

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 400 AM CDT

* AT 259 AM CDT... A SEVERE THUNDERSTORM WAS LOCATED 4 MILES NORTH OF
  VALPARAISO... AS INDICATED BY DOPPLER RADAR... MOVING EAST 35 MPH.

* THE SEVERE THUNDERSTORM WILL PASS NEAR VALPARISO BY 305 AM CDT.

THIS IS AN EXTENSION OF THE SEVERE THUNDERSTORM WARNING PREVIOUSLY IN
EFFECT FOR OKALOOSA COUNTY.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...D4EADLY 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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 3, 8:17 PM CDTSevere Thunderstorm WarningMOBEscambia73 min
May 3, 9:10 PM CDTTornado WarningMOBEscambia65 min
May 3, 9:48 PM CDTTornado WarningMOBSanta Rosa72 min
May 4, 1:08 AM CDTSevere Thunderstorm WarningMOBSanta Rosa52 min
May 4, 2:02 AM CDTSevere Thunderstorm WarningMOBOkaloosa58 min

Nearby

Severe Thunderstorm Warnings in Florida, 1998Every severe thunderstorm warning in 1998

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.