Alert archive / Florida / Tornado Warnings in 1998

Tornado Warning 55, NWS Jacksonville, FL

September 30, 1998Columbia County, Hamilton County, Florida

NWS Jacksonville, FL issued this tornado warning at Sep 30, 1998, 5:23 AM EDT for Columbia County, Hamilton County, Florida. It was in force for 77 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: Sep 30, 1998, 5:23 AM EDT (09:23 UTC)
Expired: Sep 30, 1998, 6:40 AM EDT
In force: 77 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

Counties Columbia County, FL, Hamilton 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
Sep 30, 5:00 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 9.4 hours before the alert went out and 105 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: 397 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAX 300923 RRA
TORJAX
FLC023-047-301040-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
523 AM EDT WED SEP 30 1998

* TORNADO WARNING FOR...
  EASTERN HAMILTON COUNTY IN NORTHERN FLORIDA
  COLUMBIA COUNTY IN NORTHERN FLORIDA

* UNTIL 640 AM EDT

* AT 519 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO NEAR THE INTERSTATE INTERCHANGE OF I-10 AND I-75 MOVING
  NORTH AT 15 MPH.

* THIS TORNADO IS EXPECTED TO REMAIN OVER RURAL AREAS.

GO TO A SMALL INTERIOR ROOM... ON THE LOWEST FLOOR.

STAY TUNED TO NOAA WEATHER RADIO...RADIO OR TELEVISION FOR THE
LATEST UPDATES CONCERNING THIS DEVELOPING WEATHER SITUATION.

KUYPER

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Sep 30, 3:40 AM EDT, 1 hour 43 minutes earlier.

Area forecast discussion, Sep 30, 3:40 AM EDT, 1 hour 43 minutes before

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
250 AM EDT WED SEP 30 1998

THE REMNANTS OF GEORGES...GETTING MORE EXTRATROPICAL WITH TIME...
WILL MOVE FROM EXTREME SW GA TO JUST WEST OF TLH AT 12Z...TO JUST
WEST OF JAX BY 00Z. WSR 88D SHOWING BANDS OF SHOWERS AND THUNDERSTORMS
MOVING IN FROM THE GULF ACROSS N FL AND INTO SE GA AND EXPECT THIS
ACTVTY TO MOVE INTO NE FL DURING REMAINDER OF PRE-DAWN HOURS.
BIGGEST THREAT WILL BE FLOODING FROM TRAIN ECHOES...ESP IN N FL INTO
SE GA WHERE 5 INCHES HAS ALREADY BEEN REPORTED IN BAXLEY WITH ANOTHER
2 INCHES LIKLEY. DRIER AIR ENTRAINING BEHIND SYSTEM PLUS STRONG VERTICAL
SHEAR FAVORS THREAT OF TORNADOES NEXT FEW HOURS. AS PER COORD WITH MIA
THE FLOOD WATCH WILL BE CONTINUED AND EXTENDED EAST. WOULD FAVOR THE
SAME FOR SE GA. EXPECT BULK OF PCP THIS AM...TAPERING OFF THIS AFTERNOON.

PRELIM CCF
SSI TB 086/074 086/072 08644
JAX TB 087/073 088/071 08644
GNV TB 0H87/074 088/070 08744

PETERSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 12:52 AM EDT	Tornado Warning	JAX	Suwannee	63 min
Sep 30, 12:57 AM EDT	Tornado Warning	JAX	Hamilton	63 min
Sep 30, 1:53 AM EDT	Tornado Warning	JAX	Suwannee	77 min
Sep 30, 3:09 AM EDT	Tornado Warning	JAX	Suwannee	81 min
Sep 30, 3:37 AM EDT	Flash Flood Warning	JAX	Hamilton, Suwannee	6 hr
Sep 30, 4:10 AM EDT	Tornado Warning	JAX	Columbia, Hamilton	75 min
Sep 30, 5:17 AM EDT	Tornado Warning	JAX	Suwannee	63 min
Sep 30, 6:59 AM EDT	Tornado Warning	JAX	Columbia, Gilchrist, Suwannee	76 min
Sep 30, 8:43 AM EDT	Severe Thunderstorm Warning	JAX	Alachua	32 min
Sep 30, 9:53 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	52 min
Sep 30, 12:16 PM EDT	Flash Flood Warning	JAX	Suwannee	6 hr
Sep 30, 1:37 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	63 min
Sep 30, 1:39 PM EDT	Tornado Warning	JAX	Alachua	66 min
Sep 30, 2:14 PM EDT	Tornado Warning	JAX	Bradford	46 min

Nearby

Tornado Warnings in Florida, 1998 Every tornado warning in 1998 Tornadoes 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.