Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 239, NWS Jacksonville, FL

June 29, 1998Duval County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 29, 1998, 5:50 PM EDT for Duval County, Florida. It was in force for 65 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
Jun 29, 1998, 5:50 PM EDT (21:50 UTC)
Expired
Jun 29, 1998, 6:55 PM EDT
In force
65 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Duval County, FL

What was reported inside it

TimeReportWhereRemark
Jun 29, 6:10 PM EDTThunderstorm WindJacksonville, FLLarge tree and power lines were blown down in Western sections of the county.

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, 9.8 hours before the alert went out and 19 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 1998-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 770 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 1998-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
770 J/kg
Mixed-layer CIN
-181 J/kg
Mixed-layer LCL
1790 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
74 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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 8:09 PM EDTSevere Thunderstorm WarningJAXHamilton61 min
Jun 29, 3:55 PM EDTSevere Thunderstorm WarningJAXMarion35 min
Jun 29, 4:37 PM EDTSevere Thunderstorm WarningJAXAlachua, Bradford, Union78 min
Jun 29, 5:18 PM EDTSevere Thunderstorm WarningJAXNassau62 min
Jun 29, 5:46 PM EDTSevere Thunderstorm WarningJAXPutnam64 min
Jun 29, 5:58 PM EDTSevere Thunderstorm WarningJAXBaker62 min
Jun 29, 7:04 PM EDTSevere Thunderstorm WarningJAXColumbia61 min
Jun 29, 2:55 PM EDTSevere Thunderstorm WarningJAXWayne65 min
Jun 29, 3:24 PM EDTSevere Thunderstorm WarningJAXPierce61 min
Jun 29, 4:49 PM EDTSevere Thunderstorm WarningJAXCamden, Glynn81 min

Nearby

Severe Thunderstorm Warnings in Florida, 1998Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.