Alert archive / Florida / Severe Thunderstorm Watches in 1998

Severe Thunderstorm Watch 521

June 5, 19988 counties in Alabama; 10 counties in Florida; Jackson County, Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Jun 5, 1998, 11:15 PM CDT for 8 counties in Alabama; 10 counties in Florida; Jackson County, Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 5, 1998, 11:15 PM CDT (04:15 UTC)
Expired
Jun 6, 1998, 4:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Baldwin 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, Jackson County, MS

The radar

The Mobile radar (KMOB), 98 km from the middle of the area, began a volume at 04:18 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 5, 11:41 PM CDTSevere Thunderstorm WarningMOBMobile79 min
Jun 5, 11:56 PM CDTSevere Thunderstorm WarningLIXJackson49 min
Jun 6, 12:22 AM CDTSevere Thunderstorm WarningMOBBaldwin68 min
Jun 6, 12:36 AM CDTSevere Thunderstorm WarningMOBEscambia69 min
Jun 6, 12:36 AM CDTSevere Thunderstorm WarningMOBConecuh69 min
Jun 6, 12:56 AM CDTSevere Thunderstorm WarningMOBSanta Rosa94 min
Jun 6, 1:02 AM CDTSevere Thunderstorm WarningMOBMobile43 min
Jun 6, 1:11 AM CDTSevere Thunderstorm WarningMOBButler, Covington, Crenshaw94 min
Jun 6, 1:26 AM CDTSevere Thunderstorm WarningMOBOkaloosa94 min
Jun 6, 1:58 AM CDTSevere Thunderstorm WarningTAEWalton57 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.3 hours before the alert went out and 246 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 00:00Z on 1998-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2997 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, Slidell Radar S, LA at 00:00Z on 1998-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.19395878Sfc1 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
2997 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1030 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.6

Open this sounding in Storm Lab

The text

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

597 
WWUS9 KMKC 060341
SEL1  
MKC WW 060341
ALZ000-FLZ000-060900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 521
STORM PREDICTION CENTER NORMAN OK
1041 PM CDT FRI JUN 5 1998

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHERN ALABAMA                            
   THE FLORIDA PANHANDLE                            
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1115 PM UNTIL
400 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
EITHER SIDE OF A LINE FROM 25 MILES WEST NORTHWEST OF MOBILE
ALABAMA TO 30 MILES SOUTH OF MARIANNA FLORIDA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 519...

DISCUSSION...INTENSE LINE WITH BOW ECHO STRUCTURE EXPECTED TO
CONTINUE MOVING/DEVELOPING EAST SOUTHEASTARD ALONG OUTFLOW BOUNDARY
FROM EARLIER BOW ECHO ACTIVITY.  SEVERE WINDS LIKELY WITH BOW
FEATURES AND ISOLATED LARGE HAIL ALSO POSSIBLE.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 27050.


...JOHNS

314,0883 311,0850 293,0851 295,0884

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 5, 7:30 PM CDTSevere Thunderstorm WatchSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 34 more6 hr

Nearby

Severe Thunderstorm Watches in Florida, 1998Severe Thunderstorm Watches in Alabama, 1998Severe Thunderstorm Watches in Mississippi, 1998Every severe thunderstorm 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; radar from the NEXRAD Level II archive.