Alert archive / Florida / Flash Flood Warnings in 1998

Flash Flood Warning 9, NWS Tallahassee, FL

September 29, 1998Walton County, Florida

NWS Tallahassee, FL issued this flash flood warning at Sep 29, 1998, 12:47 AM CDT for Walton County, Florida. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 29, 1998, 12:47 AM CDT (05:47 UTC)
Expired
Sep 29, 1998, 12:40 PM CDT
In force
12 hr
Issued by
NWS Tallahassee, FL
Area
Whole counties

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 25 km from the middle of the area, began a volume at 05:49 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 nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 5.8 hours before the alert went out and 181 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 1998-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 855 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 00:00Z on 1998-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 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
855 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
836 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTLH 290549
FFWTLH
FLC131-291740-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
147 AM EDT TUE SEP 29 1998

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLOOD WARNING FOR...
  WALTON COUNTY IN NORTHWESTERN FLORIDA

* UNTIL 1240 PM CDT (140 PM EDT)

DOPPLER RADAR INDICATES EXTREMELY HEAVY RAINFALL IN BANDS FROM
GEORGES WILL CONTINUE TO AFFECT WALTON COUNTY THROUGH TUESDAY.
DOPPLER RADAR RAINFALL ESTIMATES INDICATE OVER 15 INCHES OF RAIN
HAS FALLEN ACROSS THE WESTERN HALF OF WALTON COUNTY. ADDITIONAL
RAINFALL AMOUNTS OF 5 TO 10 INCHES ARE POSSIBLE THROUGH TUESDAY.

LOW-LYING ROADWAYS AND FLOOD PRONE AREAS WILL CONTINUE TO BE
AFFECTED BY FLOOD WATERS THE NEXT FEW DAYS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED
QUICKLY.  IT ONLY TAKES A FOOT OR TWO OF FLOWING WATER TO SWEEP MOST
CARS AWAY.  REMEMBER...MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.

VOLKMER

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 28, 7:55 PM CDTTornado WarningTAEWalton15 min
Sep 28, 8:30 PM CDTTornado WarningTAEWalton15 min
Sep 29, 6:52 AM CDTTornado WarningTAEHolmes, Washington63 min
Sep 29, 7:51 AM CDTFlash Flood WarningTAEBay, Holmes, Washington6 hr
Sep 29, 8:07 AM CDTTornado WarningTAEBay48 min
Sep 29, 8:24 AM CDTTornado WarningTAEWashington31 min
Sep 29, 8:49 AM CDTTornado WarningTAEHolmes46 min
Sep 29, 9:13 AM CDTSevere Thunderstorm WarningTAEBay77 min
Sep 29, 9:49 AM CDTTornado WarningTAEGulf61 min
Sep 29, 10:13 AM CDTSevere Thunderstorm WarningTAECalhoun, Jackson77 min
Sep 29, 2:35 PM CDTTornado WarningTAEGulf35 min
Sep 29, 2:57 PM CDTFlash Flood WarningTAEGadsden, Leon, Liberty4 hr
Sep 29, 2:57 PM CDTFlash Flood WarningTAEFranklin, Wakulla4 hr
Sep 29, 4:14 PM CDTSevere Thunderstorm WarningTAELeon, Wakulla76 min
Sep 29, 4:14 PM CDTSevere Thunderstorm WarningTAEGadsden76 min
Sep 29, 5:30 PM CDTSevere Thunderstorm WarningTAELeon, Wakulla60 min

Nearby

Flash Flood Warnings in Florida, 1998Every flash flood 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; radar from the NEXRAD Level II archive.