Alert archive / Florida / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 131, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 20, 2001, 7:38 PM EDT for Alachua County, Florida. It was in force for 37 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
- Jun 20, 2001, 7:38 PM EDT (23:38 UTC)
- Expired
- Jun 20, 2001, 8:15 PM EDT
- In force
- 37 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties
County Alachua County, FL
The radar
The Jacksonville radar (KJAX), 110 km from the middle of the area, began a volume at 23:39 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 |
|---|---|---|---|
| Jun 20, 8:00 PM EDT | Thunderstorm Wind | Gainesville, FL | Numerous reports of large trees and power lines 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
Tampa Bay, FL (KTBW), launched 12:00Z, 11.6 hours before the alert went out and 219 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
- 636 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1062 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 10 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 Jun 20, 2:30 PM EDT, 5 hours 8 minutes earlier.
Area forecast discussion, Jun 20, 2:30 PM EDT, 5 hours 8 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 230 PM EDT WED JUN 20 2001 CURRENTLY...SATELLITE WATER VAPOR IMAGERY SHOWED SHORT WAVE ENERGY LIFTING NORTHEAST ACROSS THE AREA. THIS ENERGY WAS GENERATING THUNDERSTORMS OVER THE ATLANTIC OFF THE FLORIDA/GEORGIA COAST. MSAS ALSO SHOWED HAT GOOD CONVERGENCE WAS GENERATING SOME THUNDERSTORMS ALONG THE EASTERN FLORIDA COAST...WITH THE THUNDERSTORMS BEING MORE NUMEROUS OVER THE CENTRAL AND SOUTHERN FLORIDA COAST. THE GULF SEA BREEZE WAS BEGINNING TO BEGINNING TO MAKE SOME MOVEMENT...WITH SOME SHOWERS BEGINNING TO DEVELOP ALONG THE I-75 CORRIDOR. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO INCREASE ACROSS THE AREA DURING THE NEXT HOUR OR TWO WITH BOTH SEABREEZES BEGINNING TO COME INTO PLAY...SO EXPECT PRETTY MUCH A REPEAT OF TUESDAY. FOR THE REMAINDER OF THE PACKAGE IT SEEMS LIKE MORE OF THE SAME WITH SEABREEZE INTERACTION PRODUCING AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. AFTERNOON HIGH TEMPERATURES WILL RANGE IN THE UPPER 80S AND LOWER 90S...WITH OVERNIGHT LOWS RANGING FROM THE UPPER 60S TO MID 70S. A COLD FRONT WILL APPROACH THE AREA BY LATE WEEK...BUT WILL PROBABLY DISSIPATE ACROSS OR JUST NORTH OF THE AREA. PRELIM AMG 70/92/69/89 4334 SSI 73/88/72/86 3334 JAX 71/90/71/90 3434 GNV 70/92/70/90 3334 33 .JAX... FL...NONE. GA...NONE. BLS
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 7:01 PM EDT | Severe Thunderstorm Warning | JAX | Marion | 44 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2001Every severe thunderstorm warning in 2001
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.