Alert archive / Georgia / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 16, NWS Jacksonville, FL

April 28, 1990Tattnall County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 28, 1990, 9:20 PM EDT for Tattnall County, Georgia. It was in force for 25 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 28, 1990, 9:20 PM EDT (01:20 UTC)
Expired: Apr 28, 1990, 9:45 PM EDT
In force: 25 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Tattnall County, GA

The radar

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

What was reported inside it

Time	Report	Where	Remark
Apr 28, 9:30 PM EDT	Hail 0.75	Tattnall, GA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Jacksonville, FL (KAYS), launched 00:00Z, 1.3 hours before the alert went out and 175 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 959 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 209 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.8

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, 3:31 PM EDT, 5 hours 49 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.

Special weather statement, Apr 28, 6:14 PM EDT, 3 hours 6 minutes before

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Special weather statement, Apr 28, 7:05 PM EDT, 2 hours 15 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 8:46 PM EDT	Severe Thunderstorm Warning	JAX	Toombs	59 min
Apr 28, 10:11 PM EDT	Severe Thunderstorm Warning	JAX	Effingham	49 min

Nearby

Severe Thunderstorm Warnings in Georgia, 1990 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.