Alert archive / Florida / Tornado Watches in 1998

Tornado Watch 841

September 27, 19989 counties in Alabama; 10 counties in Florida; 6 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Sep 27, 1998, 1:30 PM CDT for 9 counties in Alabama; 10 counties in Florida; 6 counties in Mississippi. It was in force for 12 hr.

The area

The outline as issued.

The facts

Issued
Sep 27, 1998, 1:30 PM CDT (18:30 UTC)
Expired
Sep 28, 1998, 1:00 AM CDT
In force
12 hr
Issued by
the Storm Prediction Center
All 25 counties

Baldwin County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Geneva County, AL, Houston County, AL, Mobile County, AL, Washington County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS

Warnings issued inside it

4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Sep 27, 5:52 PM CDTTornado WarningMOBBaldwin53 min
Sep 27, 8:26 PM CDTTornado WarningMOBEscambia, Santa Rosa49 min
Sep 27, 9:43 PM CDTFlash Flood WarningMOBEscambia, Santa Rosa3 hr
Sep 27, 11:51 PM CDTFlash Flood WarningMOBEscambia69 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.5 hours before the alert went out and 217 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, Slidell Radar S, LA at 12:00Z on 1998-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Slidell Radar S, LA at 12:00Z on 1998-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
955 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
79 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.

492 
WWUS9 KMKC 271749
SEL1  
MKC WW 271749
FLZ000-ALZ000-MSZ000-280600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 841
STORM PREDICTION CENTER NORMAN OK
149 PM EDT SUN SEP 27 1998

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   FLORIDA PANHANDLE                            
   SOUTHERN ALABAMA                            
   SOUTHEAST MISSISSIPPI                        
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 230 PM UNTIL
200 AM EDT.

TORNADOES...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES EITHER SIDE OF
A LINE FROM 20 MILES NORTH NORTHWEST OF GULFPORT MISSISSIPPI TO 25
MILES SOUTH SOUTHEAST OF MARIANNA FLORIDA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.


DISCUSSION...BANDS OF THUNDERSTORMS MOVING ONSHORE AHEAD OF
HURRICANE GEORGES.  VAD WIND PROFILES INDICATE FAVORABLE LOW LEVEL
SHEAR FOR BRIEF SUPERCELLS/TORNADOS.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION VECTOR 11050.


...HALES

313,0890 312,0845 293,0850 294,0891

Nearby

Tornado Watches in Florida, 1998Tornado Watches in Alabama, 1998Tornado Watches in Mississippi, 1998Every tornado watch 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.