Alert archive / Florida / Tornado Warnings in 1997

Tornado Warning 21, NWS Jacksonville, FL

July 25, 1997Nassau County, Florida

NWS Jacksonville, FL issued this tornado warning at Jul 25, 1997, 1:42 PM EDT for Nassau County, Florida. It was in force for 63 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: Jul 25, 1997, 1:42 PM EDT (17:42 UTC)
Expired: Jul 25, 1997, 2:45 PM EDT
In force: 63 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 17:45 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, 5.7 hours before the alert went out and 14 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: 1524 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: -47 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 251749
TORJAX
FLC089-251845-
 
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
142 PM EDT FRI JUL 25 1997
 
THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  245 PM EDT
FOR PERSONS IN THE FOLLOWING LOCATIONS...
 
IN NORTH FLORIDA
 
   ...NASSAU COUNTY
 
AND THE ADJOINING COASTAL WATERS.
 
 
AT 143 PM NATIONAL WEATHER SERVICE INDICATES A POSSIBLE TORNADO NEAR
FERNANDINA BEACH. THE STORM IS MOVING TO THE SOUTHWEST AT 10 MPH AND
WILL MOVE INTO THE ATLANTIC.
 
AT 143 PM A POSSIBLE TORNADO WAS REPORTED AT THE FERNANDINA AIRPORT.
 
DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO.  CARS ARE EASILY
TOSSED AROUND BY TORNADO WINDS.  IF YOU ARE CAUGHT IN THE PATH OF
A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING.  IF NO
STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT.
 
 
JOHNSON
&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 1:03 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	57 min
Jul 25, 2:40 PM EDT	Tornado Warning	JAX	Duval	50 min
Jul 25, 5:19 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval	41 min
Jul 25, 6:49 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	41 min

Nearby

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