Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 25, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Feb 17, 1998, 1:18 AM EST for Duval County, Nassau County, Florida. It was in force for 47 min. 2 reports 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
- Feb 17, 1998, 1:18 AM EST (06:18 UTC)
- Expired
- Feb 17, 1998, 2:05 AM EST
- In force
- 47 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
Counties Duval County, FL, Nassau County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 17, 1:50 AM EST | Thunderstorm Wind | Nassauville, FL | Large trees and power lines were blown down. |
| Feb 17, 2:00 AM EST | Hail 0.75 | Jacksonville, FL |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Feb 16, 11:30 PM EST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Jacksonville, FL (KJAX), launched 00:00Z, 6.3 hours before the alert went out and 3 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
- 21 J/kg
- Mixed-layer CIN
- -263 J/kg
- Mixed-layer LCL
- 859 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 244 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Feb 16, 2:55 PM EST, 10 hours 23 minutes earlier.
Area forecast discussion, Feb 16, 2:55 PM EST, 10 hours 23 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 255 PM EST MON FEB 16 1998 DISORGANIZED COMPLEX OF SFC LOWS BCM MR ORGANIZED VCNTY SRN LA TNGT THEN RPDLY LIFTS NWE TO THE TN VALLEY TUE MRNG. WARM FNT HAS MOVED TO THE N OF THE AREA WITH FA NOW UNDER WARM SECTOR. ASSOCD COLD FNT TO MOVE OVR FA LTR TNGT WITH PSBL PREFNTL SQUALL TRACKING EWD OVR AREA IN ADVANCE OF ACTUAL FNTL PASSAGE. LTST SATL LOOP INDICATING TOPS COOLING ATTM IN NRN GLFMEX JUST S OF MS/LA. U/L DIFFLUENCE CONTS ITS HOLD OVR FA AND AREA COMES UNDER FAVORABLE QUAD OF U/L JTSTRM WNDS FOR EHNANCED UVV WITH MAJORITY OF FA UNDER MDT RISK. U/L PATTERN DEAMPLIFIES LATE TUE AS CUTOFF LO NOW OVR THE SRN PLAINS LIFTS NE AND FLO OVR SRN TIER STATES BCMG ZONAL. PRELIM SSI WB 058/065 053/073 03851 JAX WB 060/071 052/072 03850 GNV WB 060/075 051/073 03850 . MOBBS
In the hours before
Special weather statement, Feb 17, 12:10 AM EST, 1 hour 8 minutes before
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</html>Special weather statement, Feb 17, 12:10 AM EST, 1 hour 8 minutes before
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</html>Special weather statement, Feb 17, 12:53 AM EST, 25 minutes before
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
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</p>
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</html>The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 16, 7:47 PM EST | Tornado Warning | JAX | Alachua | 43 min |
| Feb 16, 8:06 PM EST | Severe Thunderstorm Warning | JAX | Union | 29 min |
| Feb 16, 8:18 PM EST | Severe Thunderstorm Warning | JAX | Baker | 42 min |
| Feb 16, 8:31 PM EST | Severe Thunderstorm Warning | JAX | Nassau | 44 min |
| Feb 16, 8:55 PM EST | Severe Thunderstorm Warning | JAX | Suwannee | 45 min |
| Feb 16, 9:23 PM EST | Severe Thunderstorm Warning | JAX | Columbia, Hamilton | 42 min |
| Feb 16, 10:57 PM EST | Severe Thunderstorm Warning | JAX | Columbia, Hamilton, Suwannee | 48 min |
| Feb 16, 11:32 PM EST | Severe Thunderstorm Warning | JAX | Baker | 48 min |
| Feb 16, 11:52 PM EST | Severe Thunderstorm Warning | JAX | Nassau | 48 min |
| Feb 17, 12:38 AM EST | Severe Thunderstorm Warning | JAX | Columbia, Gilchrist, Suwannee | 32 min |
| Feb 17, 12:54 AM EST | Severe Thunderstorm Warning | JAX | Baker, Union | 31 min |
| Feb 17, 8:16 AM EST | Flash Flood Warning | JAX | Columbia, Hamilton, Suwannee | 6 hr |
| Feb 17, 8:16 AM EST | Flash Flood Warning | JAX | Baker, Duval, Nassau | 6 hr |
| Feb 17, 8:16 AM EST | Flash Flood Warning | JAX | Union | 6 hr |
| Feb 17, 8:16 AM EST | Flash Flood Warning | JAX | Clay | 6 hr |
| Feb 17, 2:25 PM EST | Flash Flood Warning | JAX | Alachua, Columbia, Gilchrist, Hamilton, Suwannee, Union | 6 hr |
| Feb 17, 2:25 PM EST | Flash Flood Warning | JAX | Bradford, Clay, Flagler, Putnam, Saint Johns | 6 hr |
| Feb 17, 2:25 PM EST | Flash Flood Warning | JAX | Baker, Duval, Nassau | 6 hr |
| Feb 17, 4:15 PM EST | Flash Flood Warning | JAX | Baker, Clay, Duval, Nassau, Saint Johns | 6 hr |
| Feb 17, 4:15 PM EST | Flash Flood Warning | JAX | Columbia, Gilchrist, Hamilton, Suwannee | 6 hr |
| Feb 17, 4:15 PM EST | Flash Flood Warning | JAX | Alachua, Bradford, Putnam, Union | 6 hr |
| Feb 17, 4:15 PM EST | Flash Flood Warning | JAX | Flagler | 6 hr |
| Feb 16, 9:06 PM EST | Severe Thunderstorm Warning | JAX | Camden, Glynn | 44 min |
| Feb 16, 11:13 PM EST | Severe Thunderstorm Warning | JAX | Clinch, Echols | 32 min |
| Feb 17, 12:12 AM EST | Tornado Warning | JAX | Camden, Charlton | 33 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.