Alert archive / Florida / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 187, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 30, 1997, 4:42 PM EDT for Clay County, Florida. It was in force for 63 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
- Aug 30, 1997, 4:42 PM EDT (20:42 UTC)
- Expired
- Aug 30, 1997, 5:45 PM EDT
- In force
- 63 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
County Clay County, FL
The radar
The Jacksonville radar (KJAX), 58 km from the middle of the area, began a volume at 20:45 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 |
|---|---|---|---|
| Aug 30, 5:00 PM EDT | Thunderstorm Wind | Orange Park, FL | Windows were blown out of an office building. Cars were damaged. |
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, 8.7 hours before the alert went out and 59 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
- 1374 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1225 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- -3 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 30, 2:48 PM EDT, 1 hour 54 minutes earlier.
Area forecast discussion, Aug 30, 2:48 PM EDT, 1 hour 54 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 245 PM EDT SAT AUG 30 1997 SFC ANALYSIS SHOWING WEAK LO WEST OF SAV MVG SW. TSMS RAPIDLY ERUPTING IN N FL WHERE MOISTURE IS HIGHEST. CAP ALMOST BROKEN AND EXPECT SCT TSRA TO CONTINUE TO ERUPT INTO EARLY EVE. MODELS INDICATE UPPER LVL DIFFLUENCE IN EXTREME NE FL INTO SE GA WHICH WILL ENHANCE STMS LATE THIS AFT AND EARLY EVE. ACTVY SHOULD START TO DIMINISH AFT 00Z. ON SUN...WEAK SFC LbO MOVES INTO NORTH GULF. SYNOPTIC FLOW BECOMES MORE SE LATE IN DAY THRU MON. PRELIM SSI BB 075/088 075/087 08232 JAX BB 074/093 073/090 08232 GNV BB 072/092 072/090 08232 PETERSON
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 3:14 PM EDT | Severe Thunderstorm Warning | JAX | Columbia, Suwannee | 46 min |
| Aug 30, 3:49 PM EDT | Severe Thunderstorm Warning | JAX | Duval | 56 min |
| Aug 30, 4:01 PM EDT | Severe Thunderstorm Warning | JAX | Gilchrist | 59 min |
| Aug 30, 4:54 PM EDT | Severe Thunderstorm Warning | JAX | Duval, Saint Johns | 66 min |
| Aug 30, 5:04 PM EDT | Severe Thunderstorm Warning | JAX | Baker | 56 min |
| Aug 30, 5:12 PM EDT | Tornado Warning | JAX | Duval | 33 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; radar from the NEXRAD Level II archive.