Alert archive / Florida / Tornado Warnings in 1993

Tornado Warning 4, NWS Jacksonville, FL

March 13, 1993Duval County, Nassau County, Florida

NWS Jacksonville, FL issued this tornado warning at Mar 13, 1993, 1:24 AM EST for Duval County, Nassau County, Florida. It was in force for 36 min.

The area

The counties it named.

The facts

Issued: Mar 13, 1993, 1:24 AM EST (06:24 UTC)
Expired: Mar 13, 1993, 2:00 AM EST
In force: 36 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

Counties Duval County, FL, Nassau County, FL

The nearest sounding before it

Jacksonville, FL (KAYS), launched 00:00Z, 6.4 hours before the alert went out and 3 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: 232 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 827 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 350 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAX 130623
TORJAX
FLC031-089-130700-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
124
 AM EST SAT MAR 13 1993
 
THE NATIONAL WEATHER SERVICE IN JACKSONVILLE FL   HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  200 AM EST
S...
 
IN NORTHEAST FLORIDA
 
   ...NORTHERN DUVAL COUNTY...NASSAU COUNTY
 
AND ADJACENT COASTAL WATERS OF NORTHEAST FLORIDA
 
 
AT 120 AM EST...DUVAL COUNTY SHERRIFS OFFICE HAS REPORTED POSSIBLE
TORNADOS IN NORTHERN DUVAL COUNTY AT 1ST STREET AND PEARL...ON PERCY
ROAD...STATE ROAD 241 NORTH AND NORTHWEST 19TH STREET.
 
VERY STRONG WINDS HAVE BEEN REPORTED AT THE INTERNATIONAL AIRPORT IN
EXCESS OF 40 MILES AN HOUR.
 
THESE TORNADO PRODUCING THUNDERSTORMS ARE NOW MOVING INTO NASSAU COUNTY
TO THE NORTHEAST AT 40 MILES AN HOUR.
 
 
 
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOOR POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.
 
 
 
&

What forecasters said that day

The local office's own words before this tornado 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, Mar 12, 10:17 PM EST, 3 hours 7 minutes before

FLZ008-007-009-012-GAZ013-015-130615-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1009 PM EST FRI MAR 12 1993

....A TORNADO WATCH IN EFFECT FOR THE FOLLOWING COUNTIES OF NORTHEAST
FLORIDA AND SOUTHEAST GEORGIA AND THE ADJACENT COASTAL WATERS UNTIL 4AM
SATURDAY MORNING...COLUMBIA...GILCHRIST...NASSAU...BAKER...HAMILTON..
UNION...BRADFORD...DUVAL...LAFAYETTE...SUWANNEE...CAMDEN GA...CHARLTON
GA...

...A TORNADO WATCH IS IN EFFECT FOR THE FOLLOWING COUNTIES OF NORTHEAST
FLORIDA AND THE ADJACENT COASTAL WATERS  UNTIL 7AM SATURDAY MORNING...
ALACHUA...CLAY...LEVY...MARION...PUTNAM...AND ST JOHNS...

AT 10 PM EST...THUNDERSTORMS IN THE NORTHERN GULF OF MEXICO WILL BE
MOVING ONSHORE THE WEST COAST OF FLORIDA LATE TONIGHT AND THROUGHOUT
MOST OF SATURDAY MORNING. SOME OF THESE THUNDERSTORMS MAY BECOME
SEVERE WITH STRONG GUSTY WINDS...FREQUENT LIGHTNING...HEAVY RAINFALL AND
HAIL. TORNADOS ARE ALWAYS POSSIBLE WHEN SEVERE THUNDERSTORMS DEVELOP
AT THIS TIME OF YEAR.

THE THUNDERSTORMS ARE MOVING EAST NORTHEAST AT 40 MILES AN HOUR.

RESIDENTS IN THE WATCH AREA SHOULD BE PREPARED IF SEVERE WEATHER IMPACTS
YOUR AREA IN THE NEXT 8 HOURS. MARINE INTERESTS SHOULD STAY IN PORT
TONIGHT AS WINDS WILL BE GUSTY AND SEAS WILL BE ROUGH.

STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER STATEMENTS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 13, 12:29 AM EST	Tornado Warning	JAX	Alachua, Bradford, Union	61 min

Nearby

Tornado Warnings in Florida, 1993 Every tornado warning in 1993 Tornadoes in 1993

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.