Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 239, NWS Jacksonville, FL

August 22, 1999Baker County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 22, 1999, 4:58 PM EDT for Baker 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
Aug 22, 1999, 4:58 PM EDT (20:58 UTC)
Expired
Aug 22, 1999, 5:45 PM EDT
In force
47 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Baker County, FL

The radar

The Jacksonville radar (KJAX), 58 km from the middle of the area, began a volume at 20:59 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 9.0 hours before the alert went out and 59 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 1999-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1223 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 1999-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 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
1223 J/kg
Mixed-layer CIN
-103 J/kg
Mixed-layer LCL
1064 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
-6 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
Aug 22, 6:04 PM EDTSevere Thunderstorm WarningJAXBaker36 min
Aug 21, 10:25 PM EDTTornado WarningJAXCamden, Glynn45 min
Aug 21, 11:31 PM EDTSevere Thunderstorm WarningJAXBrantley49 min
Aug 21, 11:50 PM EDTSevere Thunderstorm WarningJAXCharlton50 min
Aug 22, 2:16 PM EDTSevere Thunderstorm WarningJAXCamden34 min
Aug 22, 3:30 PM EDTSevere Thunderstorm WarningJAXClinch35 min
Aug 22, 4:17 PM EDTSevere Thunderstorm WarningJAXWare63 min
Aug 22, 4:31 PM EDTSevere Thunderstorm WarningJAXPierce49 min
Aug 22, 6:11 PM EDTSevere Thunderstorm WarningJAXWayne64 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999Every severe thunderstorm warning in 1999

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; radar from the NEXRAD Level II archive.