Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 101, NWS Tallahassee, FL

July 9, 1997Wakulla County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 9, 1997, 4:51 PM EDT for Wakulla County, Florida. It was in force for 69 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: Jul 9, 1997, 4:51 PM EDT (20:51 UTC)
Expired: Jul 9, 1997, 6:00 PM EDT
In force: 69 min
Issued by: NWS Tallahassee, FL
Area: Whole counties

County Wakulla County, FL

The radar

The Tallahassee radar (KTLH), 28 km from the middle of the area, began a volume at 20:50 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.

What was reported inside it

Time	Report	Where	Remark
Jul 9, 5:55 PM EDT	Thunderstorm Wind	Spring Creek, FL

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.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.9 hours before the alert went out and 29 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: 1547 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTLH 092048 RRA
SVRTLH
FLC129-FLZ505-092200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE TSTM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
451 PM EDT (351 PM CDT) WED JUL 9 1997
 
THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A
SEVERE TSTM AND SPECIAL MARINE WARNING EFFECTIVE UNTIL  600 PM EDT (500 
 FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH FLORIDA
 
   ...EASTERN WAKULLA COUNTY
 
  AND FOR MARINE INTERESTS ON THE GULF COASTAL WATERS FROM THE
 
   ...ST. MARKS  TO  AUCILLA RIVER
 
AT 4:45 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
DEVELOPING SEVERE THUNDERSTORM OVER EASTERN WAKULLA COUNTY ABOUT 3 MILES
WEST OF NEWPORT AND ST. MARKS...MOVING TO THE SOUTH AT 5 MPH. THIS STORM
WILL LIKELY PRODUCE DAMAGING WIND GUSTS AND DIME SIZED HAIL OVER THE
EASTERN PART OF WAKULLA COUNTY...MAINLY ALONG HIGHWAY 98 AND EAST OF ST.
MARKS.
 
THIS STORM WILL MOVE OUT OVER THE APALACHEE BAY AND MAY PRODUCE WIND
GUSTS IN EXCESS OF 35 KNOTS BETWEEN ST. MARKS AND THE AUCILLA RIVER.
MARINERS SHOULD SEEK SAFE HARBOR IMMEDIATELY UNTIL THE STORM PASSES.
 
 
SEVERE THUNDERSTORMS PRODUCE WINDS OF 58 MPH OR HIGHER... LARGE
HAIL... DANGEROUS LIGHTNING AND VERY HEAV&Y RAIN.  IF YOU ARE IN THE
PATH OF THIS STORM... GO TO A SAFE PLACE IMMEDIATELY.

Nearby

Severe Thunderstorm Warnings in Florida, 1997 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.