Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 124, NWS Melbourne, FL

September 4, 2001Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Sep 4, 2001, 7:51 PM EDT for Volusia County, Florida. It was in force for 54 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, 2001, 7:51 PM EDT (23:51 UTC)
Expired: Sep 4, 2001, 8:45 PM EDT
In force: 54 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 116 km from the middle of the area, began a volume at 23:54 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 11.9 hours before the alert went out and 91 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: 2418 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 681 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -4 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.

963 
WUUS52 KMLB 042352
SVRMLB
FLC127-050045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
751 PM EDT TUE SEP 4 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL VOLUSIA COUNTY
  IN EAST CENTRAL FLORIDA

* UNTIL 845 PM EDT.

* AT 751 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER DE LAND...OR ABOUT 2 MILES SOUTH OF DE
  LAND...MOVING NORTH AT 10 MPH.

EXCESSIVE 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 AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY.

DIME SIZED HAIL AND DAMAGING WIND GUSTS OVER 55 MPH ARE ALSO LIKELY. 

$$

LAT...LON 2895 8142 2891 8122 2928 8107 2933 8138

SPRATT

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 Melbourne, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 4, 1:30 PM EDT, 6 hours 21 minutes earlier.

Area forecast discussion, Sep 4, 1:30 PM EDT, 6 hours 21 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
130 PM EDT TUE SEP 4 2001

CURRENT...ACTIVE MARINE CONVECTION WAS INDEED A HARBINGER OF A MORE
ACTIVE DAY TO COME. AS WOULD BE EXPECTED WITH A HIGHER PWAT AIR MASS
...CONVECTION IS FIRING EARLIER AND CLOSER TO THE COAST COMPARED TO
THE PAST 4-5 DAYS. WILL PROBABLY NEED TO KEEP A HEALTHY EVENING POP
INLAND/NORTH...AND PERHAPS EVEN SOME SMALL POPS FOR THE WESTERN
AREAS OF THE COASTAL COUNTIES. SPECIFICS WILL BECOME CLEARER CLOSER
TO ZFP ISSUANCE TIME.

NEXT H48...COULDNT SEE A WHOLE LOT OF DIFFERENCE BETWEEN TOMORROW
AND THURSDAY. DEEP MOISTURE WILL STAY IN PLACE WITH PWATS NEAR 2.0
ENSURING ACTIVE COASTAL SEA BREEZE CONVECTION. WEAK SOUTHERLY SFC
FLOW (MORE LIKE A DRAFT) ALONG WITH ALMOST NON-EXISTENT STEERING WINDS
WILL LEAD TO SLOW STORM MOVEMENT AND LOCALLY HEAVY STORM TOTALS. AS
ACTIVITY WILL SHIFT INLAND BY LATE AFTERNOON AND CONTINUE THRU EARLY
EVENING...WILL HOLD POPS HIGHER THERE 3RD/5TH PDS.

EXTENDED...A LITTLE MORE EASTERLY COMPONENT TO THE LOW LEVEL FLOW
REGIME...ALBEIT LIGHT...IS IN THE OFFING. AVN PROGS LIGHT SYNOPTIC
FLOW TO BECOME SSE THU...SE FRI...AND PERHAPS EVEN ESE SAT. WHILE
THE AVN HAS THROWN PREVIOUS FALSE ALARMS BEFORE (FOOLING ECFL INTO
BELIEVING THE SUBTROP RIDGE NORTHWARD WHEN IT NEVER DID) THIS TIME
IT LOOKS LIKE IT WILL ACTUALLY OCCUR SINCE ITS A FUNCTION OF ERN
CONUS RIDGING BUILDING IN BEHIND THE DEPARTING WRN ATLC TROUGH.

MARINE...ALL REMAINS QUITE WITH BROAD RIDGING CONTINUING THE WEAK WIND
PATTERN. HPC EXTRAPOLATED POSNS FOR ERIN: D5/26.5N 66.5W D6/28.5N
69.0W AND D7/30.0N 73.0W. GIVEN THOSE POINTS TO WORK WITH...IT
COULD VERY WELL BECOME A MARINE CONCERN (ALSO TOO EARLY TO RULE OUT
PUBLIC AT THIS POINT) DOWN THE ROAD. HOWEVER, ANY SWELL GENERATED BY
THE SYSTEM WOULD BE BROKEN UP BY THE BAHAMA CHAIN THROUGH DAY 5 SO
AS OF YET...NO CONCERN FOR THE CURRENT CWF.

PRELIMINARY CCF NUMBERS...
DAB TT 074/090 074/089 075 4535
MCO TT 074/092 074/092 075 5555
MLB TT 075/090 076/089 076 3535      60

.MLB...NONE.

PUBLIC/MARINE...CRISTALDI
AVIATION/FIRE WX...VOLKMER

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; radar from the NEXRAD Level II archive.