Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 12, NWS Jacksonville, FL

April 28, 1990Clay County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 28, 1990, 3:58 PM EDT for Clay County, Florida. It was in force for 47 min.

The area

The counties it named.

The facts

Issued
Apr 28, 1990, 3:58 PM EDT (19:58 UTC)
Expired
Apr 28, 1990, 4:45 PM EDT
In force
47 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Clay County, FL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Jacksonville, FL (KAYS), launched 12:00Z, 8.0 hours before the alert went out and 59 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, Jacksonville, FL at 12:00Z on 1990-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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, Jacksonville, FL at 12:00Z on 1990-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 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
9 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
866 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Special weather statement, Apr 28, 9:58 AM EDT, 6 hours before
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Special weather statement, Apr 28, 12:09 PM EDT, 3 hours 49 minutes before
FLZ007-009-281800-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1210 PM EDT SAT APR 28 1990

AT NOON EDT NATIONAL WEATHER SERVICE RADAR SHOWED THUNDERSTORMS WITH
HEAVY RAIN FROM MAYO FLORIDA NORTHEAST THROUGH LIVE OAK TO JASPER IN
HAMILTON COUNTY.

THIS AREA OF THUNDERSTORMS IS MOVING EAST AT 25 TO 30 MILES AN HOUR.
THESE THUNDERSTORMS WILL PRODUCE STRONG GUSTY WINDS..LOCALLY HEAVY RAIN
DANGEROUS LIGHTNING AND POSSIBLE HAIL AS THEY MOVE THROUGH THE AREA FOR
THE NEXT ONE TO TWO HOURS.

REMEMBER...MORE PEOPLE ARE KILLED BY LIGHTNING IN FLORIDA THAN ANY
OTHER STATE IN THE COUNTRY. WHEN A THUNDERSTORM THREATENS TRY TO GET
INSIDE A HOME OR LARGE BUILDING. IF YOU DO NOT HAVE TIME TO REACH A
SAFE BUILDING OR CAR...AVOID OPEN FIELDS SUCH AS GOLF COURSES...
BASEBALL FIELDS...BEACHES...OR FISHING FROM A SMALL BOAT OR PIERS.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER NEWS MEDIA FOR FURTHER
STATEMENTS CONCERNING THESE THUNDERSTORMS THAT MAY BE NEEDED LATER TODAY
AS THESE THUNDERSTORMS CONTINUE PUSHING THEIR WAY EAST TO THE COAST.
Special weather statement, Apr 28, 2:17 PM EDT, 1 hour 41 minutes before
FLZ007-008-009-281830

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
216 PM EDT SAT APR 28 1990

             ...TORNADO WATCH NUMBER 175  IS IN EFFECT FOR PERSONS
IN ALACHUA...BRADFORD...CLAY...DUVAL...NASSAU...LAFAYETTE...
GILCHRIST...SUWANNEE...HAMILTON...COLUMBIA...UNION...BAKER COUNTIES OF
FLORIDA UNTIL 6PM EDT.

AT 215 PM EDT WEATHER RADAR INDICATED THUNDERSTORMS MOVING INTO NORTHWEST
NASSAU COUNTY...WESTERN DUVAL...TO JUST WEST OF GAINESVILLE.
THE STRONGEST STORMS WERE MOVING THROUGH NORTHWEST NASSAU COUNTY WHERE
STRONG GUSTY WINDS...FREQUENT LIGHTNING...HEAVY RAIN...AND HAIL ARE LIKLEY
THE NEXT HALF HOUR.  THUNDERSTORMS SHOULD BE MOVING THROUGH JACKSONVI5LLE
WITHIN THE HOUR.

STAY TUNED FOR FURTHER STATEMENTS OR WARNINGS.
Special weather statement, Apr 28, 3:31 PM EDT, 27 minutes before
FLZ007-008-009-282030

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
328 PM EDT SAT APR 28 1990

             ...TORNADO WATCH NUMBER 175  IS IN EFFECT FOR PERSONS
IN ALACHUA...BRADFORD...CLAY...DUVAL...NASSAU...LAFAYETTE...
GILCHRIST...SUWANNEE...HAMILTON...COLUMBIA...UNION...BAKER COUNTIES OF
FLORIDA AND THE ADJACENT COASTAL WATERS UNTIL 6PM EDT.

AT 325 PM EDT WEATHER RADAR INDICATED THUNDERSTORMS OCCURRING FROM JUST
SOUTH OF ST SIMONS ISLAND GEORGIA TO JACKSONVILLE AND FURTHER
SOUTHWEST TO CECIL AND GAINESVILLE.  THE STRONGEST STORMS WERE
OCCURRING JUST SOUTH OF CECIL AND NEAR KINGSLEY LAKE IN CLAY COUNTY.
THE STORMS ARE MOVING TO THE NORTHEAST AT 30 MILES AN HOUR AND WILL
LIKELY PRODUCE STRONG GUSTY WINDS...DANGEROUS LIGHTNING...HEAVY RAIN...
AND POSSIBLE HAIL AS THEY MOVE THROUGH THE AREA THE NEXT COUPLE OF HOURS.

SO FAR NO SEVERE WEATHER HAS BEEN REPORTED TO THE WEATHER OFFICE...
HOWEVER PERSONS IN AND CLOSE TO THE WATCH AREA ARE URGED TO STAY TUNED
AND KEEP ABREAST OF THE SITUATION AND BE PREPARED TO ACT QUICKLY
IF A WARNING IS ISSUED.

MARINE INTERSTS OPERATING IN THE COASTAL WATERS FROM AMELIA ISLAND
TO ST AUGUSTINE SHOULD BE ALERT FORz THREATENING WEATHER AND BE PREPARED
TO SEEK SAFE HARBOUR AS THESE THUNDERSTORMS WILL MOVE OFFSHORE THE NEXT
SEVERAL HOURS.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 1:29 PM EDTSevere Thunderstorm WarningJAXBaker46 min
Apr 28, 4:56 PM EDTSevere Thunderstorm WarningJAXPutnam34 min
Apr 28, 7:24 PM EDTSevere Thunderstorm WarningJAXJeff Davis66 min

Nearby

Severe Thunderstorm Warnings in Florida, 1990Every severe thunderstorm warning in 1990

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.