Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 196, NWS Jacksonville, FL

July 20, 2001Hamilton County, Suwannee County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 20, 2001, 6:23 PM EDT for Hamilton County, Suwannee County, Florida. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jul 20, 2001, 6:23 PM EDT (22:23 UTC)
Expired: Jul 20, 2001, 7:15 PM EDT
In force: 52 min
Issued by: NWS Jacksonville, FL
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Hamilton County, FL, Suwannee County, FL

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.4 hours before the alert went out and 124 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: 938 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1105 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 26 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 202224
SVRJAX

FLC047-121-202315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
623 PM EDT FRI JUL 20 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 715 PM EDT

* AT 623 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS 3 MILES EAST
  OF CROSSROADS...OR ABOUT 7 MILES WEST OF JASPER...MOVING SOUTH AT
  20 MPH.

* SOME LOCATIONS NEAR THE PATH OF THE STORM THROUGH 715 PM EDT...
  SUWANNEE RIVER STATE PARK AND CROSSROADS...
  SUWANNEE SPRINGS...
  LIVE OAK AND NEWBURN...
  HOUSTON...
  WELLBORN...

HAIL...INTENSE LIGHTNING AND STRONG DAMAGING WINDS ARE LIKELY WITH 
THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THE STORM 
PASSES. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND 
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS 
THEY MAY BE WASHED OUT.

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT...OR YOU CAN CALL THE NATIONAL
WEATHER SERVICE DIRECTLY AT 904-741-4370 TO REPORT SEVERE WEATHER.

LAT...LON 3054 8297 3052 8319 3012 8317 2995 8280
          3033 8280

$$

CARROLL

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, 3:45 PM EDT, 2 hours 38 minutes earlier.

Area forecast discussion, Jul 20, 3:45 PM EDT, 2 hours 38 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
345 PM EDT FRI JUL 20 2001

HAVE GONE WITH THE ETA/MESO-ETA MODELS WHICH BRINGS COLD FRONT INTO
SE GA TONIGHT...NORTH FLORIDA SATURDAY AM...AND STALLS IT ACROSS
CENTRAL FLORIDA 00Z SUNDAY. COLD FRONT UNUSUALLY STRONG FOR THIS
TIME OF YEAR...THEN AGAIN WE HAD ONE ONLY A WEEK AGO. THE AVN AND ETA
AGREE ON WHERE STALLING IT...BUT THE AVN MOVES FRONT MUCH SLOWER
AND DEVELOPES STRONGER WAVE ALONG IT. WILL NOT GO WITH THIS AND HAVE
LEANED TOWARDS THE ETA. GOING WITH THE FASTER SOLUTION REQUIRES
THE CWF TO BE BROKEN UP...HAVE SEPERATED THE GA AND FL WATERS AND
BRING WINDS AROUND TO NE 10 TO 15 KNOTS (MESO-ETA) IN GA WATERS.
DEPENDING ON EXACT STRENGHT OF WAVE AND FRONT MAY NEED TO BUMP WINDS
UP OR EVEN DOWN. HOWEVER...THE BIG EMPHASIS WILL BE ON THE COVERAGE
OF THE STORMS WITH THE APPROACH OF THE FRONT. WILL RAISE POPS
TONIGHT AND INTO SATURDAY. HIGHEST POPS SATURDAY WILL BE ACROSS
NORTH CENTRAL FL (80 PCT). LATER SHIFTS SHOULD MONITOR FOR POSSIBLE
FLOOD WATCH. DECIDED TO HOLD BACK ON IT FOR NOW...DUE TO THE
UNCERTAINTY OF EXACT PLACE FRONT STALLS. ALSO...THE GROUNDS ARE NOT
TOO SATURATED AND CAN TAKE MORE RAIN. HAVE LOWERED POPS SLIGHTLY IN
OUR NW CWA SATURDAY NIGHT AND SUNDAY...WENT 50 TO 60 PCT EVERYWHERE
ELSE.

PRELIM

AMG 72/86/72/86 7534
SSI 73/84/72/85 7745
JAX 73/84/72/86 7755
GNV 74/84/72/85 7856 08

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

EIGHT

In the hours before

Local storm report, Jul 20, 6:04 PM EDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE, FL
604 PM EDT FRI JUL 20 2001

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

0530 PM    ALACHUA                   FL   WIND DAMAGE
07/20/01   ALACHUA                        EMERGENCY MANAGEMENT
                                          REPORTED TREES DOWN.

ARS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 4:04 PM EDT	Severe Thunderstorm Warning	JAX	Baker	26 min
Jul 20, 4:39 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Columbia, Gilchrist	51 min
Jul 20, 4:39 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	51 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; the sounding from the Mesonet's radiosonde archive.