Alert archive / Florida / Tornado Warnings in 1997

Tornado Warning 23, NWS Jacksonville, FL

August 11, 1997Saint Johns County, Florida

NWS Jacksonville, FL issued this tornado warning at Aug 11, 1997, 2:26 PM EDT for Saint Johns County, Florida. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 11, 1997, 2:26 PM EDT (18:26 UTC)
Expired
Aug 11, 1997, 3:15 PM EDT
In force
49 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 70 km from the middle of the area, began a volume at 18:25 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 6.4 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 1997-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1435 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 1997-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.1939Sfc1 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
1435 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
581 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
18 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 111829 RRA
TORJAX
FLC109-FLZ501-111915-
 
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
226 PM EDT MON AUG 11 1997
 
THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A
TORNADO AND SPECIAL MARINE WARNING EFFECTIVE UNTIL  315 PM EDT
FOR PERSONS IN THE FOLLOWING LOCATIONS...
 
IN NORTH FLORIDA
 
   ...SOUTHEASTERN ST. JOHNS COUNTY
 
IN NORTHEAST FLORIDA
      ...FOR BOATERS ON THE COASTAL WATERS FROM
 
 
   ...ST AUGUSTINE  TO  MARINELAND
 
AT 225 PM EDT THE U.S. COAST GUARD REPORTED A WATER SPOUT A HALF MILE
OFFSHORE CRESCENT BEACH MOVING SOUTHWEST. DOPPLER RADAR INDICATED
THE STORM CAUSING THIS SPOUT WAS BEGINNING TO MOVE ONSHORE TO
THE NORTH OF MARINELAND AND WILL AFFECT AREAS IN SOUTHEAST ST JOHNS
COUNTY EAST OF U.S HIGHWAY 1. CONDITIONS ARE FAVORABLE FOR OTHER WATER
SPOUTS TO FORM OFFSHORE AND MOVE WEST.
 
 
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINF&ORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
 
PP

Nearby

Tornado Warnings in Florida, 1997Every tornado warning in 1997Tornadoes in 1997

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.