Alert archive / Florida / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 61, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at May 31, 1997, 4:16 PM EDT for Nassau County, Florida. It was in force for 44 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
- May 31, 1997, 4:16 PM EDT (20:16 UTC)
- Expired
- May 31, 1997, 5:00 PM EDT
- In force
- 44 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
County Nassau County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 31, 4:30 PM EDT | Thunderstorm Wind | Yulee, 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, 8.3 hours before the alert went out and 14 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
- 357 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 587 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 35 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 May 31, 2:31 PM EDT, 1 hour 45 minutes earlier.
Area forecast discussion, May 31, 2:31 PM EDT, 1 hour 45 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 230 PM EDT SAT MAY 31 1997 CONVECTION FIRING UP ALONG GULF AND WEST COAST SEABREEZES AND MOVING INLAND ACROSS N FL ATTM. EAST COAST SEABREEZE BEGINNING TO MOVE IN WITH TSM ACVYT ACROSS FLAGER CO. AS AFTERNOON WEARS ON...EXPECT WEST COAST SEABREEZE TO BE STRONGER AND PUSH CONVECTION INTO NE FL AND SE GA. WILL THEREFORE RAISE POPS INTO GOOD CHC CAT THIS EVE. ON SUN UPPER LOW OVER SE LA CONTINUES TO AMPLIFY AS IT MOVES NW ALABAMA 12Z SUN AND THEN JUST MEANDERS AFTER THAT. COLD FRONT WILL MOVE INTO N FL SUN EVE. SHOULD BE MOIST AND UNSTABLE ENOUGH (PLUS WITH COLD AIR ALOFT) TO SUPPORT TSM ACTVTY. SOME MAY BE SEVERE AS MENTIONED lIN SWODY1. PRELIM SSI TE 081/069 080/069 082 08575 JAX TE 068/085 067/084 066 08575 GNV TE 086/067 084/068 087 08575 PETERSON
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 5:00 PM EDT | Severe Thunderstorm Warning | JAX | Nassau | 30 min |
| May 31, 5:07 PM EDT | Severe Thunderstorm Warning | JAX | Camden | 53 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1997Every severe thunderstorm warning in 1997
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.