Alert archive / Florida / Tornado Warnings in 1990

Tornado Warning 3, NWS Jacksonville, FL

April 22, 1990Saint Johns County, Florida

NWS Jacksonville, FL issued this tornado warning at Apr 22, 1990, 7:20 PM EDT for Saint Johns County, Florida. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
Apr 22, 1990, 7:20 PM EDT (23:20 UTC)
Expired
Apr 22, 1990, 8:00 PM EDT
In force
40 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Saint Johns 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, 11.3 hours before the alert went out and 71 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 1990-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 16 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 1990-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
16 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1185 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
60 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.

000 
TTAA00 KJAX 222321
TORJAX
FLC109-230000-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
720 PM EDT SUN APR 22 1990
 
THE NATIONAL WEATHER SERVICE IN JACKSONVILLE FL   HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  800 PM EDT
 
 
IN NORTHEAST FLORIDA
 
   ...ST JOHNS COUNTY
 
AND ADJACENT COASTAL WATERS OF NORTHEAST FLORIDA
 
 
AT 720 PM EDT WEATHER RADAR INDICTED A POSSIBLE TORNADO IN NORTH ST
JOHNS COUNTY MOVING SOUTH AT 25 MILES AN HOUR.
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITaH YOUR HANDS.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 22, 6:28 PM EDTSevere Thunderstorm WarningJAXDuval62 min
Apr 22, 6:45 PM EDTTornado WarningJAXDuval45 min

Nearby

Tornado Warnings in Florida, 1990Every tornado warning in 1990Tornadoes 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.