Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 169, NWS Jacksonville, FL

June 30, 2001Hamilton County, Florida; Echols County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 30, 2001, 7:36 PM EDT for Hamilton County, Florida; Echols County, Georgia. It was in force for 54 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 30, 2001, 7:36 PM EDT (23:36 UTC)
Expired: Jun 30, 2001, 8:30 PM EDT
In force: 54 min
Issued by: NWS Jacksonville, FL
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Hamilton County, FL, Echols County, GA

What was reported inside it

Time	Report	Where	Remark
Jun 30, 8:00 PM EDT	Thunderstorm Wind	Needmore, GA	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, 11.6 hours before the alert went out and 117 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: 2043 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: -1 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 30, 2:25 PM EDT, 5 hours 11 minutes earlier.

Area forecast discussion, Jun 30, 2:25 PM EDT, 5 hours 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
225 PM EDT SAT JUN 30 2001

CURRENTLY...HIGH PRES RIDGE WAS N OF THE FA WITH A WEAK 1016 MB LOW
PRES CENTER APPROX 60NM S OF PNS. ATLC SEA BREEZE KICKING OFF
SHOWERS AND THUNDERSTORMS OVER THE COASTAL COUNTIES WITH AFTN
HEATING HELPING TO INITIATE STORMS INLAND. FAIRLY UNIFORM CU
DEVELOPMENT OTHERWISE OVER INLAND COUNTIES AND EXPECT FURTHER
HEATING/ATLC SEA BREEZE TO IGNITE CONVECTION REMAINDER OF AFTN.
SHORT TERM AFFECT OF COMPLEX OF SHOWERS AND STORMS OVER THE FL
PANHANDLE WILL BE CANOPY OF CIRRUS SPREADING OVER THE WERN COUNTIES.

FORECAST...IT APPEARS THE ETA IS DOING A FAIRLY GOOD JOB WITH
CONVECTION OVER THE REGION AT THIS TIME SO WILL FOLLOW CLOSELY TO IT
WITH THIS PACKAGE. MODELS ARE SIMILAR DRIFTING THE SFC RIDGE LOCATED
TO OUR N INTO N FL BY MON AS A FAIRLY STRONG COLD FRONT MOVES OVER
THE MID ATLC STATES MON MORNING. SOMEWHAT DRIER AIR IS EXPECTED OVER
THE FORECAST PD PRIMARILY OVER THE SRN HALF OF THE CWA SO LOOKS LIKE
RAIN CHANCES ARE DECREASING THERE. ALOFT...5H RIDGE WILL BEGIN TO
BUILD OVER THE AREA AND THEN DRIFT SWD LATE MON. EXPECT SEA BREEZES
TO BE MAIN PLAYERS NEXT 2 DAYS TO DEVELOP CONVECTION DUE TO LIGHT
BOUNDARY LAYER WINDS BUT LOOKS AS THOUGH ATLC SEA BREEZE WILL BE THE
DOMINATE ONE. STEERING WINDS WILL ALSO SLACKEN AND SHIFT SLOWLY SW
SUN AND MON GIVING COASTAL COUNTIES PRETTY SIMILAR POPS TO INLAND
AREAS. GUIDANCE TEMPS AND POPS ARE CLOSE AND LOOK REASONABLE
ALTHOUGH FWC POPS MAY BE SLIGHTLY TOO DRY OVER INLAND AREAS.

MARINE...SE TO S WINDS AOB 15 KT TO CONTINUE THROUGH SUN THEN
SHIFTING SW OVER THE NRN WATERS MON AS RIDGE SINKS SWD. NEW AVN RUN
INDICATES COLD FRONT TO DROP S TO NEAR SAV ON TUE...WHICH IS IN
AGREEMENT WITH THE 00Z MRF AND THE NEW UKMET RUN. MODELS THEN TEND
WASH OUT THE FRONT THEREAFTER. WILL MAKE A FEW MINOR CHANGES TO THE
EXTENDED MARINE.

EXTENDED...BROAD TROUGHING REMAINS OVER THE ERN U.S. DURING MOST OF
THE EXTENDED PD. AVN AND MRF BRING A STRONG 5H LOW OVER SERN CANADA
TOWARD MID WEEK WHICH WILL DEEPEN E COAST TROUGH AND BRING PERHAPS
A BETTER CHANCE OF SHOWERS AND THUNDERSTORMS OVER THE FA BY FRI.
OVERALL NOT EXPECTING MUCH CHANGE TO THE CURRENT EXTEND FORECAST.

PRELIM
AMG 72/89/71/91 3524
SSI 75/87/75/88 2323
JAX 72/90/72/90 2423
GNV 71/90/71/91 3423 02

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

ARS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 6:30 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	45 min
Jun 30, 7:02 PM EDT	Severe Thunderstorm Warning	JAX	Columbia	28 min
Jun 30, 7:19 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	41 min
Jun 30, 4:24 PM EDT	Severe Thunderstorm Warning	JAX	Appling	51 min
Jun 30, 4:30 PM EDT	Severe Thunderstorm Warning	JAX	Bacon	45 min
Jun 30, 5:18 PM EDT	Severe Thunderstorm Warning	JAX	Coffee	42 min

Nearby

Severe Thunderstorm Warnings in Florida, 2001 Severe Thunderstorm Warnings in Georgia, 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.