Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 196, NWS Jacksonville, FL

July 20, 2000Suwannee County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 20, 2000, 3:21 PM EDT for Suwannee County, Florida. It was in force for 39 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: Jul 20, 2000, 3:21 PM EDT (19:21 UTC)
Expired: Jul 20, 2000, 4:00 PM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Suwannee County, FL

What was reported inside it

Time	Report	Where	Remark
Jul 20, 3:35 PM EDT	Tornado F0	Falmouth, FL	Weak FO. Large trees 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.4 hours before the alert went out and 128 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2018 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1446 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS52 KJAX 201921
SVRJAX
FLC121-202000-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
321 PM EDT THU JUL 20 2000

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SUWANNEE COUNTY IN NORTHERN FLORIDA

* UNTIL 400 PM EDT

* AT 321 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES NORTHWEST OF LIVE OAK...MOVING SOUTH AT
  10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LIVE OAK AND NEWBURN BY 335 PM EDT...
  HOUSTON BY 350 PM EDT...
  MCALPIN AND OBRIEN BY 400 PM EDT...

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU AR7E
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

$$
LAT...LON 3043 8297 3041 8317 3011 8314 2996 8280


MOBBS

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 Jul 20, 3:00 PM EDT, 21 minutes earlier.

Area forecast discussion, Jul 20, 3:00 PM EDT, 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
300 PM EDT THU JUL 20 2000

ANOTHER HOT ONE...AS EARLIER ANTICIPATED WITH THE HEAT ADVISORY...WITH
THE TEMPERATURE AT JAX AT 102 AND CLIMBING. HEAT INDICES HAVE BEEN IN
THE 110 TO 115 DEGREE RANGE ALL AFTERNOON. ISOLATED STRONG/SEVERE THUNDERSTORMS
POPPING UP IN THE HEAT OF THE DAY JUST SOUTH OF JAX...ALSO STORMS FIRING
UP IN NORTH FLORIDA FORM GULF COAST SEABREEZE. NOT EXPECTING MUCH COVERAGE
FORM THE STORMS BUT THEY COULD BE SEVERE. HAVE PUT THE POPS AT 20 PCT
IN FLORIDA AND LESS THAN 20 IN GEORGIA. WILL COVER THE THE STORMS IN
NOWCASTS.

SURFACE ANALYSIS SHOWING AREA OF LOW PRESSURE OFF THE SOUTH CAROLINA COAST
WITH WEAK COLD FRONT STRETCHING TO NEAR THE FLORIDA GEORGIA BORDER.
SLIGHTLY DRIER AIR BEHIND FRONT WITH DEWPT TEMPS NOTED IN THE 60S
IN SOUTHEAST GEORGIA (BUT WITH TEMPS STILL NEAR 100 THERE). FORECAST...
WILL NOT MOVE FRONT MUCH FROM ITS POSITION AND WILL WASH IT OUT FRIDAY.
ON FRIDAY MODELS MOVE WEAK 850-700 MB SHORT WAVE INTO THE AREA BY LATE
AFTERNOON WHICH WILL INCREASE THE MOISTURE AND INSTABILITY. HAVE RAISED
POPS AND LOWERED TEMPS. MARINE...WINDS HAVE GRAYS REEF HAVE DECREASED
AND HAVE INCREASED AT THE ST AUGUSTINE PIER. WILL CONTINUE NORTH SOUTH
BREAKUP WITH WINDS GENERALLY SOUTH OR SOUTHWEST NO HIGHER THAN 15 KNOTS.

AMG 73/98/72/95 1334
SSI 76/95/75/93 1334
JAX 76/98/75/96 2324
GNV 76/97/74/95 2424 08

.JAX......
.GA...NONE.
.FL...NONE.

PETERSON

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 2:46 PM EDT	Severe Thunderstorm Warning	JAX	Hamilton	29 min
Jul 20, 3:11 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	49 min
Jul 20, 4:07 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	38 min
Jul 20, 4:12 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Gilchrist	33 min
Jul 20, 4:20 PM EDT	Tornado Warning	JAX	Suwannee	25 min
Jul 20, 4:31 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	29 min
Jul 20, 4:43 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	47 min
Jul 20, 4:54 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Putnam	51 min
Jul 20, 4:58 PM EDT	Severe Thunderstorm Warning	JAX	Columbia	47 min
Jul 20, 5:21 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Bradford	39 min
Jul 20, 5:45 PM EDT	Severe Thunderstorm Warning	JAX	Putnam	30 min
Jul 20, 5:58 PM EDT	Severe Thunderstorm Warning	JAX	Clay	47 min
Jul 20, 6:03 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	27 min

Nearby

Severe Thunderstorm Warnings in Florida, 2000 Every severe thunderstorm warning in 2000

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.