Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 1, NWS Jacksonville, FL

January 7, 1998Putnam County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jan 7, 1998, 10:42 PM EST for Putnam County, Florida. It was in force for 68 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: Jan 7, 1998, 10:42 PM EST (03:42 UTC)
Expired: Jan 7, 1998, 11:50 PM EST
In force: 68 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Putnam County, FL

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 3.7 hours before the alert went out and 99 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: 652 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 736 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 290 m²/s²
0-3 km storm-relative helicity: 367 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 11.5

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 Jan 7, 8:15 PM EST, 2 hours 27 minutes earlier.

Area forecast discussion, Jan 7, 8:15 PM EST, 2 hours 27 minutes before

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In the hours before

Special weather statement, Jan 7, 10:20 PM EST, 22 minutes before

AMZ435-450-452-454-470-472-474-
FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-080800-

SOUTHEAST GEORGIA AND NORTHEAST FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1020 PM EST WED JAN 7 1998

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR ALL OF SOUTHEAST
GEORGIA UNTIL 3 AM EST...

A LINE OF SHOWERS AND THUNDERSTORMS WILL MOVE IN FROM THE GULF
OVERNIGHT. DUE TO THE STRONG WINDS JUST ABOVE GROUND LEVEL AND
AN UNSTABLE AIRMASS A FEW OF THE STORMS MAY BE ACCOMPANIED BY
DAMAGING WIND GUSTS.

ALL INTERESTS SHOULD MONITOR LOCAL RADIO...TELEVISION AND NOAA
WEATHER RADIO FOR FURTHER STATEMENTS ON THIS DEVELOPING SITUATION.

SPOTTERS SHOULD REMAIN ALERT FOR POSSIBLE ACTIVATION.

PETERSON

Special weather statement, Jan 7, 10:20 PM EST, 22 minutes before

AMZ435-450-452-454-470-472-474-
FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-080800-

SOUTHEAST GEORGIA AND NORTHEAST FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1020 PM EST WED JAN 7 1998

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR ALL OF SOUTHEAST
GEORGIA UNTIL 3 AM EST...

A LINE OF SHOWERS AND THUNDERSTORMS WILL MOVE IN FROM THE GULF
OVERNIGHT. DUE TO THE STRONG WINDS JUST ABOVE GROUND LEVEL AND
AN UNSTABLE AIRMASS A FEW OF THE STORMS MAY BE ACCOMPANIED BY
DAMAGING WIND GUSTS.

ALL INTERESTS SHOULD MONITOR LOCAL RADIO...TELEVISION AND NOAA
WEATHER RADIO FOR FURTHER STATEMENTS ON THIS DEVELOPING SITUATION.

SPOTTERS SHOULD REMAIN ALERT FOR POSSIBLE ACTIVATION.

PETERSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 8, 4:09 AM EST	Severe Thunderstorm Warning	JAX	Marion	56 min
Jan 8, 8:46 AM EST	Flash Flood Warning	JAX	Marion	6 hr
Jan 8, 3:02 PM EST	Flash Flood Warning	JAX	Marion	6 hr

Nearby

Severe Thunderstorm Warnings in Florida, 1998 Every severe thunderstorm warning in 1998

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.