Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 85, NWS Jacksonville, FL

April 9, 1998Columbia County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 9, 1998, 6:33 AM EDT for Columbia County, Florida. It was in force for 47 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: Apr 9, 1998, 6:33 AM EDT (10:33 UTC)
Expired: Apr 9, 1998, 7:20 AM EDT
In force: 47 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Columbia County, FL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 2:30 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 10.6 hours before the alert went out and 94 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: 14 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 512 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 313 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Apr 9, 2:30 AM EDT, 4 hours 3 minutes earlier.

Area forecast discussion, Apr 9, 2:30 AM EDT, 4 hours 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
230 AM EDT THU APR 9 1998

LITTLE BUSY THIS AM... TORNADO WATCH PRETTY WELL SPELLS OUT THE PRBLM
THIS AM! FNTL SYS LOOKS TO MAKE IT`S WAY <INTO THE AREA DRG THE AFTN HR.

JAX VAD WND HAS 50 KT JET JUST OFF SFC THIS AM W/ STORM TRACKING NE.

PRELIM

SSI TU 080/054 069/047 07610
JAX TU 083/053 071/045 07610
GNV TU 083/053 072/046 07610

K. KUYPER

In the hours before

Special weather statement, Apr 9, 4:29 AM EDT, 2 hours 4 minutes before

AMZ435-450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-091330-

SOUTHEAST GEORGIA AND NORTHEAST FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
429 AM EDT THU APR 9 1998

A TORNADO WATCH IS IN EFFECT UNTIL 700 AM FOR THE FOLLOWING
COUNTIES...

IN SOUTHEAST GEORGIA... ECHOLS...CLINCH... ATKINSON... COFFEE...
JEFF DAVIS... APPLING... BACON... WARE... CHARLTON... PIERCE...
BRANTLEY... WAYNE... CAMDEN... AND GLYNN.

IN NORTHEAST FLORIDA... HAMILTON... SUWANNEE... COLUMBIA...
BAKER... UNION... BRADFORD... BAKER... NASSAU... DUVAL... CLAY...
AND ST. JOHNS.

A STRONG COLD FRONT WILL MOVE SOUTHEAST THIS MORNING... ACROSS
SOUTHEAST GEORGIA AND NORTHEAST FLORIDA. AHEAD OF THE FRONT THE
ATMOSPHERE IS CAPABLE OF PRODUCING SEVERE THUNDERSTORMS AND
TORNADOES.

AT 430 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
STRONGEST STORMS WERE LOCATED MAINLY NORTHWEST OF US-84 IN
SOUTHEAST GEORGIA. INDIVIDUAL STORMS WERE MOVING NORTHEAST AT
AROUND 50 MPH.

FOR MARINE INTEREST...SMALL CRAFT ADVISORY IS IN EFFECT TODAY FOR
THE COASTAL WATERS.

SKYWARN STORM SPOTTERS LOCATED IN THE WATCH AREA SHOULD ACTIVATE.

STAY TUNED TO NOAA WEATHER RADIO... YOUR LOCAL RADIO OR TELEVISION
STATIONS... YOUR CABLE TELEVISION OUTLET FOR ADDITIONAL STATEMENTS
OR WARNINGS.

JOHNSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 4:38 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton	62 min
Apr 9, 6:17 AM EDT	Severe Thunderstorm Warning	JAX	Suwannee	63 min
Apr 9, 7:33 AM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	77 min
Apr 9, 8:06 AM EDT	Tornado Warning	JAX	Duval	64 min
Apr 9, 2:57 AM EDT	Severe Thunderstorm Warning	JAX	Appling	63 min
Apr 9, 3:45 AM EDT	Severe Thunderstorm Warning	JAX	Jeff Davis	60 min
Apr 9, 3:53 AM EDT	Tornado Warning	JAX	Jeff Davis	47 min
Apr 9, 4:48 AM EDT	Tornado Warning	JAX	Jeff Davis	47 min
Apr 9, 5:04 AM EDT	Severe Thunderstorm Warning	JAX	Clinch, Echols	61 min
Apr 9, 5:21 AM EDT	Severe Thunderstorm Warning	JAX	Coffee	49 min
Apr 9, 5:59 AM EDT	Tornado Warning	JAX	Appling	66 min

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.