Alert archive / Georgia / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 313, NWS Jacksonville, FL

July 31, 1998Brantley County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 31, 1998, 7:31 PM EDT for Brantley County, Georgia. It was in force for 49 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
Jul 31, 1998, 7:31 PM EDT (23:31 UTC)
Expired
Jul 31, 1998, 8:20 PM EDT
In force
49 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Brantley County, GA

What was reported inside it

TimeReportWhereRemark
Jul 31, 7:45 PM EDTThunderstorm WindHortense, GALarge trees and power lines were blown down.

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, 11.5 hours before the alert went out and 82 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 1998-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 500 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 1998-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -41 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
500 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
1175 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-41 m²/s²
0-3 km storm-relative helicity
-21 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.5

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 7:48 PM EDTSevere Thunderstorm WarningJAXDuval, Saint Johns47 min
Jul 31, 5:31 PM EDTSevere Thunderstorm WarningJAXAppling44 min
Jul 31, 6:11 PM EDTSevere Thunderstorm WarningJAXWayne64 min
Jul 31, 6:36 PM EDTSevere Thunderstorm WarningJAXAtkinson, Ware49 min
Jul 31, 6:54 PM EDTSevere Thunderstorm WarningJAXPierce51 min

Nearby

Severe Thunderstorm Warnings in Georgia, 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.