Alert archive / Florida / Tornado Warnings in 1998

Tornado Warning 13, NWS Jacksonville, FL

May 4, 1998Hamilton County, Florida

NWS Jacksonville, FL issued this tornado warning at May 4, 1998, 5:05 PM EDT for Hamilton County, Florida. It was in force for 50 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
May 4, 1998, 5:05 PM EDT (21:05 UTC)
Expired
May 4, 1998, 5:55 PM EDT
In force
50 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Hamilton County, FL

What was reported inside it

TimeReportWhereRemark
May 4, 5:15 PM EDTHail 0.75Jasper, 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

Jacksonville, FL (KJAX), launched 12:00Z, 9.1 hours before the alert went out and 120 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 1998-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1091 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 1998-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.193958Sfc1 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
1091 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
904 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAX 042105 RRA
TORJAX
FLC047-042155-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
505 PM EDT MON MAY 4 1998

* TORNADO WARNING FOR...
  SOUTHWESTERN AND SOUTH CENTRAL HAMILTON COUNTY IN NORTHERN FLORIDA

* UNTIL 555 PM EDT


* AT 503 PM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO BETWEEN THE SUWANNEE RIVER STATE PARK AND
  WESTLAKE AND MOVING SOUTHEAST AT 30 MPH.

  NO CITIES ARE IN THE PROJECTED PATH OF THIS TORNADO.

IF YOU ARE IN A MULTIPLE STORY BUILDING...GO TO A SMALL INTERIOR ROOM
AWAY FROM WINDOWS.

IF YOU ARE CAUGHT OUTSIDE...SEEK SAFETY IN A NEARBY STURDY
BUILDING. AS A LAST RESORT... SEEK REFUGE IN A CULVERT...
DITCH OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. BEWARE
THE THREAT OF RISING WATER.

KUYPER/MOHLIN

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 12:45 PM EDTSevere Thunderstorm WarningJAXPutnam35 min
May 4, 12:50 PM EDTSevere Thunderstorm WarningJAXFlagler, Saint Johns50 min
May 4, 12:53 PM EDTSevere Thunderstorm WarningJAXMarion47 min
May 4, 4:31 PM EDTSevere Thunderstorm WarningJAXHamilton64 min

Nearby

Tornado Warnings in Florida, 1998Every tornado warning in 1998Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.