Alert archive / Florida / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 30, NWS Melbourne, FL

July 18, 2002Martin County, Saint Lucie County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 18, 2002, 3:40 PM EDT for Martin County, Saint Lucie County, Florida. It was in force for 35 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: Jul 18, 2002, 3:40 PM EDT (19:40 UTC)
Expired: Jul 18, 2002, 4:15 PM EDT
In force: 35 min
Issued by: NWS Melbourne, FL
Area: Whole counties

Counties Martin County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 101 km from the middle of the area, began a volume at 19:42 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

Miami, FL (KMFL), launched 12:00Z, 7.7 hours before the alert went out and 157 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: 2542 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 21 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.

136 
WUUS52 KMLB 181940
SVRMLB
FLC085-111-182015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
339 PM EDT THU JUL 18 2002

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MARTIN COUNTY IN FLORIDA.
  SOUTHERN ST. LUCIE COUNTY IN FLORIDA.

* UNTIL 415 PM EDT.

* AT 339 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS...OVER
  NORTHERN MARTIN COUNTY...MOVING SOUTHWEST AT 25 MPH.

* AT 339 PM EDT...EMERGENCY MANAGEMENT OFFICIALS ALSO REPORTED A     
  FUNNEL CLOUD IN PORT ST LUCIE.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  INDIANTOWN.

SEVERE THUNDERSTORMS CONTAIN WIND GUSTS OF 60 MPH OR HIGHER...AND
HAIL THE SIZE OF DIMES OR LARGER. MOVE TO A PLACE OF SAFETY.

$$

LAT...LON 2722 8031 2729 8050 2716 8058 2696 8046

25

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 Jul 18, 2:08 PM EDT, 1 hour 32 minutes earlier.

Area forecast discussion, Jul 18, 2:08 PM EDT, 1 hour 32 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
949 AM EDT THU JUL 18 2002

.CURRENTLY/TONIGHT...SEA BREEZE WAS PUSHING INLAND WITH FEW CELLS
STARTING TO FORM AROUND I-95.  CU FIELD IS BEST DEVELOPED OVER
THE SOUTHERN THIRD OF THE AREA BUT EXPECT BOUNDARIES WILL PROPAGATE
SCATTERED STORMS TO CENTRAL/NORTHERN INTERIOR SECTIONS THIS EVENING
AS WELL.

.DISCUSSION...PATTERN THROUGH THE MIDDLE OF NEXT WEEK LOOKS RATHER
TYPICAL WITH MID/UPPER RIDGE AXIS SITUATED JUST TO OUR NORTH AND
TUTT AXIS TO OUR SOUTH.  SURFACE RIDGE AXIS STILL PROGGED TO BUILD
ACROSS THE SOUTHERN PENINSULA THE NEXT FEW DAYS AND THEN TO THE
CENTRAL PENINSULA EARLY NEXT WEEK.

WHILE THERE MAY BE MINOR DAY TO DAY SUBTLE FEATURES THAT AFFECT THE
AREA...EXPECT THAT OVERALL PATTERN WILL FAVOR SLIGHTLY BELOW AVERAGE
COVERAGE OF AFTERNOON/EVENING POPS...WITH GREATEST CHANCES BEING OVER
THE INTERIOR.

BY WED/THU...MRF SHOWS MIGRATION NORTHWARD OF MID/UPPER RIDGE WITH
POSSIBLE INFLUENCE OF TUTT CELL AND ENHANCED MOISTURE/INSTABILITY.
WAY TO FAR OUT TO BE CONFIDENT ON THIS THOUGH.

FWC POP NUMBERS STILL LOOK TOO HIGH ESPECIALLY ALONG THE COAST SO
WILL STAY CLOSE TO MET/MAV NUMBERS AND CURRENT FORECAST.

MARINE...WITH SURFACE RIDGE STARTING TO BUILD ACROSS THE PENINSULA
FRIDAY...WINDS SHOULD INCREASE OVER THE NORTHERN LEG.  THEN AS
RIDGE STARTS TO NUDGE NORTHWARD 10 KNOT FORECAST LOOKS GOOD. LITTLE
CHANGE TO CURRENT FORECAST EXPECTED.

PRELIMINARY CCF...
DAB BB 075/093 075/093 074 1323
MCO BB 075/094 075/093 074 3414
MLB BB 075/092 075/091 074 1313

.MLB...NONE.

PUBLIC/MARINE...LASCODY
AVIATION/FIRE WX...WIMMER

Nearby

Severe Thunderstorm Warnings in Florida, 2002 Every severe thunderstorm warning in 2002

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.