Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 348, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 14, 1998, 3:28 PM EDT for Columbia 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 14, 1998, 3:28 PM EDT (19:28 UTC)
- Expired
- Aug 14, 1998, 4:15 PM EDT
- In force
- 47 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
County Columbia County, FL
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 7.5 hours before the alert went out and 94 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
- 745 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 971 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 96 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 14, 2:50 PM EDT, 38 minutes earlier.
Area forecast discussion, Aug 14, 2:50 PM EDT, 38 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 250 PM EDT FRI AUG 14 1998 CURRENTLY...SURFACE ANALYSIS SHOWING STATIONARY FRONT IN CENTRAL GEORGIA WITH RIDGE ACROSS THE CENTRAL PENINSULA. EAST COAST SEABREEZE WAS FORMING WITH WEST COAST SEABREEZE BEGINNING TO PENETRATE INLAND AND SETTING OFF NUMEROUS SHOWERS AND THUNDERSTORMS FROM MARION COUNTY TO THE SUWANNEE RIVER. FORECAST...EXPECT AREA OF CONVERGENCE TO DEVELOP LATE THIS AFT/EARLY EVE IN NE FL AND SE GA...PROBABLY NEAR EAST COAST. THIS WILL BE THE FOCUS FOR CONVECTION WITH HEAVY RAIN AND FREQUENT LIGHTNING THE MAIN THREATS BUT ISOLATED PULSE SEVERE STORMS POSSIBLE. MOST STORMS SHOULD BE OVER BY AROUND 00Z BUT A CHANCE OF LINGERING STORMS NEAR EAST COAST TIL AROUND 03Z. ON SAT...FRONT IN GA LIFTS NORTH AS HIGH PRESSURE BEGINS TO BUILD INTO THE AREA WITH SLIGHTLY DRIER AIR. PREFER WETTER FAN GUIDANCE FIRST PERIOD...THEN A COMPROMISE BETWEEN DRIER FWC AND FAN FOR SATURDAY. PRELIM CCF SSI BB 076/090 077/089 08443 JAX BB 073/094 075/094 08443 GNV BB 072/093 073/093 08342 PETERSON
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:00 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia | 65 min |
| Aug 14, 4:01 PM EDT | Severe Thunderstorm Warning | JAX | Flagler, Saint Johns | 64 min |
| Aug 14, 5:23 PM EDT | Severe Thunderstorm Warning | JAX | Duval | 32 min |
| Aug 14, 5:49 PM EDT | Severe Thunderstorm Warning | JAX | Nassau | 61 min |
| Aug 14, 5:57 PM EDT | Severe Thunderstorm Warning | JAX | Duval | 63 min |
| Aug 14, 5:30 PM EDT | Tornado Warning | JAX | Charlton | 50 min |
| Aug 14, 6:48 PM EDT | Tornado Warning | JAX | Camden | 62 min |
| Aug 14, 7:10 PM EDT | Severe Thunderstorm Warning | JAX | Glynn | 60 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; the sounding from the Mesonet's radiosonde archive.