Alert archive / Florida / Tornado Warnings in 1999
Tornado Warning 21, NWS Jacksonville, FL
NWS Jacksonville, FL issued this tornado warning at Nov 1, 1999, 8:16 PM EST for Hamilton County, Florida. It was in force for 29 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
- Nov 1, 1999, 8:16 PM EST (01:16 UTC)
- Expired
- Nov 1, 1999, 8:45 PM EST
- In force
- 29 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
County Hamilton County, FL
The radar
The Moody AFB radar (KVAX), 44 km from the middle of the area, began a volume at 01:19 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 |
|---|---|---|---|
| Nov 1, 8:50 PM EST | Tornado F0 | Jasper, FL | Tornado was weak, with most of the damage at tree top level. Tornado moved into Echols County, Georgia. |
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 00:00Z, 1.3 hours before the alert went out and 120 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
- 59 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1120 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KJAX 020118 RRA TORJAX FLC047-020145- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE JACKSONVILLE FL 816 PM EST MON NOV 1 1999 THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A * TORNADO WARNING FOR... HAMILTON COUNTY IN NORTHERN FLORIDA * UNTIL 845 PM EST * AT 813 PM EST... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A DEVELOPING TORNADO 4 MILES NORTHWEST OF JASPER... MOVING NORTHEAST AT 30 MPH. * A LOCATION FIN THE PATH OF THIS TORNADO IS... JASPER 820 PM EST BELMONT BY 840 PM EST IF YOU ARE IN THE PATH OF THIS STORM...GO TO A SMALL INTERIOR ROOM AWAY FROM WINDOWS. WELSH/ACS
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 1, 7:31 PM EST | Severe Thunderstorm Warning | JAX | Suwannee | 29 min |
| Nov 1, 7:45 PM EST | Severe Thunderstorm Warning | JAX | Columbia, Hamilton | 45 min |
| Nov 1, 9:31 PM EST | Severe Thunderstorm Warning | JAX | Alachua | 44 min |
Nearby
Tornado Warnings in Florida, 1999Every tornado warning in 1999Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.