Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 144, NWS Jacksonville, FL

June 21, 2001Duval County, Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 21, 2001, 5:43 PM EDT for Duval County, Nassau County, Florida. It was in force for 62 min. 4 reports 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 21, 2001, 5:43 PM EDT (21:43 UTC)
Expired: Jun 21, 2001, 6:45 PM EDT
In force: 62 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

Counties Duval County, FL, Nassau County, FL

What was reported inside it

Time	Report	Where	Remark
Jun 21, 5:45 PM EDT	Hail 1	Yulee, FL
Jun 21, 5:45 PM EDT	Hail 0.88	Arlington, FL
Jun 21, 6:00 PM EDT	Thunderstorm Wind	Jacksonville, FL	Large trees were blown down at the Rally Creek subdivision.
Jun 21, 6:40 PM EDT	Thunderstorm Wind	Ft Caroline Shrs, FL	Large trees were blown down at St. Johns and Ft. Caroline Rd.

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, 9.7 hours before the alert went out and 3 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: 984 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 975 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 21, 1:45 PM EDT, 3 hours 58 minutes earlier.

Area forecast discussion, Jun 21, 1:45 PM EDT, 3 hours 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
145 PM EDT THU JUN 21 2001

CURRENT...WEAK SFC RIDGE OVER THE AREA. 2 RATHER VIGOROUS...BUT
SMALL...SHORT WAVES AFFECTING THE GA CWA WITH SCATTERED STRONG
TSTM. W COAST SEABREEZE ACTIVITY ALSO GOT AN EARLY START. EVIDENCE
OF AN E COAST SEABREEZE JUST SHOWING UP AT SAUF1 AND KSGJ...ALTHO
MOST E COAST SITES STILL REPORTING A LIGHT W WIND.

MODELS...MODELS CONTINUE TO SHOW TROF AXIS APPROACHING THE AREA FROM
THE W DURING THE FCST PD. THIS WILL GRADUALLY INCREASE DYNAMICS...
ESPECIALLY OVER NW PORTION OF AREA ON SAT. THIS WILL ALSO TAP INTO
MORE ABUNDANT GULF MOISTURE.

PUBLIC...SCATTERED CONVECTION WILL CONTINUE IN GA WITH SHORT
WAVES...ALTHO MESO-ETA SHOWS THEM DAMPENING OUT THIS EVENING.
CONVECTIVE PATTERN IN FL WILL BE SIMILAR TO YESTERDAY EVENING...WITH
ACTIVITY FOCUSING OVER INTERIOR AREAS. HOWEVER...WITH A LITTLE MORE
WESTERLY FLOW ALOFT...STORMS WILL AGAIN APPROACH ATLC COASTAL
COUNTIES BEFORE WEAKENING. GRADUAL INCREASE IN POPS INDICATED BY
PREVIOUS FCSTR LOOKS ON TRACK...AND MAV GUIDANCE SEEMS TO HAVE THE
BEST NUMBERS IN MOST LOCALES. TEMPS NEAR CLIMO...WITH SLIGHTLY LOWER
HIGHS ON SAT DUE TO EARLIER CONVECTION INITIATION AND POSSIBLY MORE
CLOUD COVER.

EXTENDED...APPROACHING SFC FRONT STALLS OVER NW GA CWA...THEN
DISSIPATES BY MON...SO CONTINUE WITH CURRENT EXTENDED TREND OVER
MOST ZONES.

MARINE...WILL INCREASE SAT WINDS SLIGHTLY OVER PRESENT PACKAGE AHEAD
OF FRONTAL SYSTEM. OTHERWISE...LITTLE CHANGE.

PRELIM
AMG 69/89/70/86 3536
SSI 72/88/72/86 3546
JAX 71/91/71/89 3546
GNV 70/90/70/87 4536

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

PUBLIC/MARINE...CARROLL
AVIATION/FIRE...SCOTT

In the hours before

Special weather statement, Jun 21, 12:00 PM EDT, 5 hours 43 minutes before

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-212200-

NORTHEAST FLORIDA/SOUTHEAST GEORGIA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1200 PM EDT THU JUN 21 2001

A MOIST AND UNSTABLE AIRMASS IN COMBINATION WITH HEATING AND
SEABREEZES WILL ONCE AGAIN LEAD TO SCATTERED THUNDERSTORMS
LATE THIS AFTERNOON AND EVENING. MOST OF THE COVERAGE OF
THE HEAVIER STORMS WILL BE ACROSS THE INLAND AREAS...GENERALLY
WEST OF INTERSTATE 95. A COUPLE OF STORMS MAY BECOME BRIEFLY
SEVERE WITH DAMAGING WINDS THE MAIN THREAT. ALL STORMS WILL BE
CAPABLE OF FREQUENT DEADLY CLOUD TO GROUND LIGHTNING AND LOCALLY
HEAVY RAIN THAT COULD CAUSE TEMPORARY FLOODING OF SOME LOW
LYING AREAS.

DUE TO THE POSSIBILITY OF SOME SEVERE WEATHER...STORM SPOTTERS SHOULD
BE ON THE ALERT FOR POSSIBLE ACTIVATION LATE THIS AFTERNOON AND
EVENING.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN
JACKSONVILLE WEBSITE ON THE INTERNET AT WWW.SRH.NOAA.GOV/JAX.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:13 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	32 min
Jun 20, 9:56 PM EDT	Severe Thunderstorm Warning	JAX	Baker	34 min
Jun 21, 2:49 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion	56 min
Jun 21, 4:29 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	46 min
Jun 21, 4:53 PM EDT	Severe Thunderstorm Warning	JAX	Duval	52 min
Jun 21, 5:01 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	44 min
Jun 21, 5:13 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	47 min
Jun 21, 10:43 AM EDT	Severe Thunderstorm Warning	JAX	Bacon, Coffee	47 min
Jun 21, 12:57 PM EDT	Severe Thunderstorm Warning	JAX	Brantley	48 min
Jun 21, 4:24 PM EDT	Severe Thunderstorm Warning	JAX	Ware	36 min
Jun 21, 4:38 PM EDT	Severe Thunderstorm Warning	JAX	Charlton	52 min
Jun 21, 5:29 PM EDT	Severe Thunderstorm Warning	JAX	Charlton	46 min
Jun 21, 6:10 PM EDT	Severe Thunderstorm Warning	JAX	Camden	50 min

Nearby

Severe Thunderstorm Warnings in Florida, 2001 Every 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.