Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 339, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 10, 1998, 3:58 PM EDT for Flagler County, Florida. It was in force for 62 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
- Aug 10, 1998, 3:58 PM EDT (19:58 UTC)
- Expired
- Aug 10, 1998, 5:00 PM EDT
- In force
- 62 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
County Flagler County, FL
The radar
The Jacksonville radar (KJAX), 119 km from the middle of the area, began a volume at 20:01 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 10, 4:08 PM EDT | Thunderstorm Wind | Beverly Beach, FL | Large 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, 8.0 hours before the alert went out and 121 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.
- Mixed-layer CAPE
- 1870 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 567 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Aug 10, 2:23 PM EDT, 1 hour 35 minutes earlier.
Area forecast discussion, Aug 10, 2:23 PM EDT, 1 hour 35 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 223 PM EDT MON AUG 10 1998 88D AND SAT PIX INDICATES DEVELOPING TSTMS OVER MOST ERN SECTION OF NE FL. EXPECT REDEVELOPMENT OVER ENTIRE FORECAST AREA AFTER 500 PM WITH A FEW SEVERE STORMS. WITH WEAK FLOW MOST STORMS WILL PRODUCE RAINFALL AMOUNTS IN THE 1-11/2 INCH RANGE. OTHERWISE EXPECT LITTLE CHANGE IN OVERALL PATTERN... 500H WAVE WILL ROTATE SLOWLY NORTH OF AREA WITH S/W MOVING ACROSS CWA BY END OF PERIOD. AFTERNOON AND EVENING CAPE VALUES BOTH DAYS WILL CLIMB INTO THE 3000 J/KG RANGE. PRELIM SSI BB 073/092 073/092 22525 JAX BB 072/095 072/092 22535 GNV BB 072/093 072/092 22525 JOHNSON
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 2:33 PM EDT | Severe Thunderstorm Warning | JAX | Saint Johns | 62 min |
| Aug 10, 6:58 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Duval | 32 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; radar from the NEXRAD Level II archive.