Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 299, NWS Jacksonville, FL

September 4, 2000Flagler County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 4, 2000, 7:57 PM EDT for Flagler County, Florida. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 4, 2000, 7:57 PM EDT (23:57 UTC)
Expired: Sep 4, 2000, 8:45 PM EDT
In force: 48 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Flagler County, FL

The radar

The Jacksonville radar (KJAX), 119 km from the middle of the area, began a volume at 23:55 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 12.0 hours before the alert went out and 121 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: 815 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 894 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 5 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 Sep 4, 2:50 PM EDT, 5 hours 7 minutes earlier.

Area forecast discussion, Sep 4, 2:50 PM EDT, 5 hours 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
250 PM EDT MON SEP 4 2000

SFC ANALYSIS INDICATES LOW LEVEL TROUGHING EXTENDS FROM THE FL
PANHANDLE TO THE WRN CAROLINAS. LOW TO MID LEVEL SW FLOW DOMINATES E
OF THE TROUGH AXIS OVER THE CWA. RADAR SHOWS CONVECTION FIRING NEAR
THE E COAST SEA BREEZE OVER NE FL AND COASTAL SE GA. GOOD LOW LEVEL
CONVERGENCE INDICATED IN INTERIOR SE GA WHERE NUMEROUS SHOWERS AND
TSRA ARE OCCURRING.

FORECAST...MODELS IN FAIR AGREEMENT WITH FORECAST PD. MID-UPPER
LEVEL TROUGH OVER THE SE STATES EXPECTED TO CONTINUE THROUGH THE PD
BUT ANOTHER POTENT SHORTWAVE COMING IN FROM THE NW MOVES INTO THE
TROUGH BY TUESDAY AFTN. AT THE SAME TIME...THE 5H RIDGE TO THE S
EXPECTED TO BUILD NWD MAINLY ON WED. AS A RESULT...THE TROUGH AND
ASSOCIATED MID LEVEL CIRCULATION RETROGRADES OVER THE NRN GULF OF
MEXICO. ONE OF THE MAIN DIFFERENCES IN MODELS APPEARS ON TUE WHEN
THE AVN DEVELOPS A STRONG SFC LOW OVER SRN SC WHEREAS ETA IS MUCH
WEAKER AND FARTHER S AND NGM SHOWS LITTLE IF ANY LOW CENTER THERE.
WILL CHOSE A WEAKER SOLUTION TO THE AVN WITH A SLOWER PROGRESSION OF
THE FRONTAL BOUNDARY SWD AND MORE IN LINE WITH THE ETA. BY 12Z WED
THINK FRONT WILL BE NEARING THE FL/GA BORDER. MODELS CONSISTENT
BRINGING A STRONG 1032 MB HIGH INTO NEW ENGLAND BY EARLY WED. THUS
WILL SEE WINDS SHIFTING TO MORE S TO SE IN LOW LEVELS THROUGH THE PD
AND PROBABLY A DECREASE IN MID LEVEL MOISTURE ON WED IN N FL. BEST
OMEGA FIELD APPEARS TO BE OVER SE GA AND INLAND N FL DURING THE PD
BUT E SEA BREEZE BOUNDARY MAY PROVIDE NECESSARY LIFT FOR SCT TO
NUMEROUS CONVECTION NEAR THE COAST. NGM GUIDANCE POPS APPEAR
REASONABLE WITH SOME ADJUST UPWARD TOWARD AVN POPS. BLEND OF TEMPS
PREFERRED.

MARINE...WINDS SLY AT 10 KT OVER THE WATERS EXCEPT LITTLE HIGHER
WITH SEA BREEZE INFLUENCE AT THE COAST WITH SAUF1 SE 13 KT NOW.
ETA AND NGM KEEP WINDS BELOW SCEC LEVELS THROUGH TUE NIGHT WITH THE
AVN STRONGER DUE TO DEVELOPING LOW OVER SC. WILL KEEP WINDS SLY
DURING THE PD AND INDICATE WINDS INCREASING DURING THE EXTENDED
PD.

PRELIM CCF
AMG 71/85/71/83 5655
SSI 74/83/74/82 4655
JAX 72/89/73/87 4644
GNV 72/87/71/86 4634 02

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

In the hours before

Local storm report, Sep 4, 5:12 PM EDT, 2 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE, FL
512 PM EDT MON SEP 4 2000

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0407 PM    PALATKA                   FL   .75 INCH HAIL
09/04/00   PUTNAM                         REPORTED BY LAW
                                          ENFORCEMENT AT INTERSECTION
                                          OF HIGHWAYS 100 ANDD 19.
ECZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 8:54 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Putnam	36 min
Sep 4, 4:16 PM EDT	Severe Thunderstorm Warning	JAX	Putnam, Saint Johns	44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.