Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 99, NWS Jacksonville, FL

June 27, 1997Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 27, 1997, 7:30 PM EDT for Saint Johns County, Florida. It was in force for 45 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
Jun 27, 1997, 7:30 PM EDT (23:30 UTC)
Expired
Jun 27, 1997, 8:15 PM EDT
In force
45 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Saint Johns County, FL

The nearest sounding before it

Jacksonville, FL (KNIP), launched 12:00Z, 11.5 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 1997-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 695 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 1997-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
695 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
945 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 27, 1:29 PM EDT, 6 hours 1 minute earlier.

Area forecast discussion, Jun 27, 1:29 PM EDT, 6 hours 1 minute before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
125 PM EDT FRI JUN 27 1997

VSBL SATELLITE SHOWING TSMS BREAKING OUT AHEAD OF GULF COAST
SEABREEZE AND VORT LOBE MVG ACROSS ALABAMA ATTM. TRAJECTORY
AND DEVLOPMENT OF STMS WILL BRING THEM INTO CWA THIS AFT/EVE.
SFC OBS INDICATE EAST COAST SEABREEZE UNDERWAY BUT ONLY WEAK
AND THE WEST COAST SEABREEZE WILL BE THE DOMINANT ONE TODAY.
THEREFORE...EXPECTING MOST CONVECTION IN NE FL AND SE GA LATE
THIS AFT INTO EVE AND WILL UP POPS ALONG EAST COAST. ON SAT...A WEAK
BACKDOOR COLD FRONT MAKES IT INTO UPPER SE GA WITH WEAK VORT LOBE
SWINGING THROUGH N PART OF CWA. WILL GO WITH LIKLEY POPS SSI AND JAX.

PRELIM
SSI TT 074/086 073/086 08565
JAX TT 073/091 072/091 08565
GNV TT 071/091 071/091 08454

PETERSON

Nearby

Severe Thunderstorm Warnings in Florida, 1997Every 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; the sounding from the Mesonet's radiosonde archive.