Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 389, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 30, 1998, 8:43 AM EDT for Alachua County, Florida. It was in force for 32 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
- Sep 30, 1998, 8:43 AM EDT (12:43 UTC)
- Expired
- Sep 30, 1998, 9:15 AM EDT
- In force
- 32 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
County Alachua County, FL
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 30, 5:00 AM EDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 0.7 hours before the alert went out and 111 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
- 2 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 1382 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
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 Sep 30, 7:56 AM EDT, 47 minutes earlier.
Area forecast discussion, Sep 30, 7:56 AM EDT, 47 minutes before
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Special weather statement, Sep 30, 5:30 AM EDT, 3 hours 13 minutes before
AMZ435-450-452-454-470-472-474- FLZ020>025-030>033-035>038-040- GAZ132>136-149>154-162>166-301130- NORTHEAST FLORIDA AND SOUTHEAST GEORGIA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE JACKSONVILLE FL 530 AM EDT WED SEP 30 1998 ...A TORNADO WATCH IS IN EFFECT FOR SOUTHEAST GEORGIA... NORTHEAST FLORIDA AND THE COASTAL WATERS UNTIL 1000 AM EDT... ...A FLOOD WATCH IS IN EFFECT THROUGH TODAY FOR NORTHEAST FLORIDA... ...A FLASH FLOOD WATCH IS IN EFFECT THROUGH TODAY FOR ALL OF SOUTHEAST GEORGIA... THE REMAINS OF GEORGES CONTINUES TO MOVE SLOWLY EASTWARD ACROSS SOUTH GEORGIA. THE STRONG LOW LEVEL FLOW HAS INCREASED THE POTENTIAL FOR SEVERE THUNDERSTORMS AND TORNADOES ACROSS SOUTHEAST GEORGIA... NORTHEAST FLORIDA...INCLUDING THE COASTAL WATERS. PERSONS IN THE WATCH AREA ARE URGED TO MONITOR THE WEATHER AND TO TAKE ACTION IF WARNINGS ARE ISSUED. STORM SPOTTERS SHOULD ACTIVATE IN THE WATCH AREA THROUGH 1000 AM. FOR ADDITIONAL INFORMATION VISIT THE NATIONAL WEATHER SERVICE WEB SITE ON THE INTERNET AT HTTP://WWW.NWSJAX.NOAA.GOV (LOWER CASE LETTERS) JOHNSON
Special weather statement, Sep 30, 5:30 AM EDT, 3 hours 13 minutes before
AMZ435-450-452-454-470-472-474- FLZ020>025-030>033-035>038-040- GAZ132>136-149>154-162>166-301130- NORTHEAST FLORIDA AND SOUTHEAST GEORGIA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE JACKSONVILLE FL 530 AM EDT WED SEP 30 1998 ...A TORNADO WATCH IS IN EFFECT FOR SOUTHEAST GEORGIA... NORTHEAST FLORIDA AND THE COASTAL WATERS UNTIL 1000 AM EDT... ...A FLOOD WATCH IS IN EFFECT THROUGH TODAY FOR NORTHEAST FLORIDA... ...A FLASH FLOOD WATCH IS IN EFFECT THROUGH TODAY FOR ALL OF SOUTHEAST GEORGIA... THE REMAINS OF GEORGES CONTINUES TO MOVE SLOWLY EASTWARD ACROSS SOUTH GEORGIA. THE STRONG LOW LEVEL FLOW HAS INCREASED THE POTENTIAL FOR SEVERE THUNDERSTORMS AND TORNADOES ACROSS SOUTHEAST GEORGIA... NORTHEAST FLORIDA...INCLUDING THE COASTAL WATERS. PERSONS IN THE WATCH AREA ARE URGED TO MONITOR THE WEATHER AND TO TAKE ACTION IF WARNINGS ARE ISSUED. STORM SPOTTERS SHOULD ACTIVATE IN THE WATCH AREA THROUGH 1000 AM. FOR ADDITIONAL INFORMATION VISIT THE NATIONAL WEATHER SERVICE WEB SITE ON THE INTERNET AT HTTP://WWW.NWSJAX.NOAA.GOV (LOWER CASE LETTERS) JOHNSON
Special weather statement, Sep 30, 7:39 AM EDT, 1 hour 4 minutes before
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</html>Special weather statement, Sep 30, 7:39 AM EDT, 1 hour 4 minutes before
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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 |
|---|---|---|---|---|
| Sep 30, 12:52 AM EDT | Tornado Warning | JAX | Suwannee | 63 min |
| Sep 30, 12:57 AM EDT | Tornado Warning | JAX | Hamilton | 63 min |
| Sep 30, 1:53 AM EDT | Tornado Warning | JAX | Suwannee | 77 min |
| Sep 30, 3:09 AM EDT | Tornado Warning | JAX | Suwannee | 81 min |
| Sep 30, 3:37 AM EDT | Flash Flood Warning | JAX | Hamilton, Suwannee | 6 hr |
| Sep 30, 4:10 AM EDT | Tornado Warning | JAX | Columbia, Hamilton | 75 min |
| Sep 30, 5:17 AM EDT | Tornado Warning | JAX | Suwannee | 63 min |
| Sep 30, 5:23 AM EDT | Tornado Warning | JAX | Columbia, Hamilton | 77 min |
| Sep 30, 6:59 AM EDT | Tornado Warning | JAX | Columbia, Gilchrist, Suwannee | 76 min |
| Sep 30, 9:53 AM EDT | Severe Thunderstorm Warning | JAX | Hamilton, Suwannee | 52 min |
| Sep 30, 12:16 PM EDT | Flash Flood Warning | JAX | Suwannee | 6 hr |
| Sep 30, 1:37 PM EDT | Severe Thunderstorm Warning | JAX | Alachua | 63 min |
| Sep 30, 1:39 PM EDT | Tornado Warning | JAX | Alachua | 66 min |
| Sep 30, 2:14 PM EDT | Tornado Warning | JAX | Bradford | 46 min |
| Sep 29, 8:15 PM EDT | Tornado Warning | JAX | Appling, Bacon | 45 min |
| Sep 29, 11:17 PM EDT | Flash Flood Warning | JAX | Atkinson, Bacon, Coffee, Jeff Davis, Ware | 9 hr |
| Sep 29, 11:17 PM EDT | Flash Flood Warning | JAX | Appling, Pierce | 9 hr |
| Sep 29, 11:17 PM EDT | Flash Flood Warning | JAX | Charlton | 9 hr |
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.