Alert archive / Florida / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 6, NWS Melbourne, FL

April 4, 2002Orange County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 4, 2002, 5:35 PM EST for Orange County, Seminole County, Florida. It was in force for 40 min. 2 reports 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
Apr 4, 2002, 5:35 PM EST (22:35 UTC)
Expired
Apr 4, 2002, 6:15 PM EST
In force
40 min
Issued by
NWS Melbourne, FL
Area
Whole counties

Counties Orange County, FL, Seminole County, FL

The radar

The Melbourne radar (KMLB), 83 km from the middle of the area, began a volume at 22:35 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.

What was reported inside it

TimeReportWhereRemark
Apr 4, 5:57 PM ESTHail 0.75Longwood, FL
Apr 4, 6:14 PM ESTHail 0.75Winter Spgs, FL

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

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.6 hours before the alert went out and 78 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-pSkew-T log-p diagram, Cape Canaveral, FL at 12:00Z on 2002-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 113 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 12:00Z on 2002-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
113 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
909 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
29 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 KMLB 042235
SVRMLB
FLC095-117-042315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
534 PM EST THU APR 4 2002

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ORANGE COUNTY
  SOUTH SEMINOLE COUNTY
  IN EAST CENTRAL FLORIDA

* UNTIL 615 PM EST.

* AT 533 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER WEKIWA SPRINGS STATE PARK...OR ABOUT 4
  MILES SOUTHEAST OF MOUNT PLYMOUTH...MOVING SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR WEKIVA SPRINGS...FOREST CITY AT 540 PM EST
  NEAR LONGWOOD...ALTAMONTE SPRINGS AT 545 PM EST
  NEAR FERN PARK...MAITLAND AT 550 PM EST
  NEAR CASSELBERRY AT 555 PM EST
  
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MILES AN
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. IF
THE STORM APPROACHES YOU...MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR.

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE STORM. IF YOU ARE IN ITS
PATH...PUT YOUR CAR IN A GARAGE AND MOVE TO A STURDY BUILDING AWAY
FROM WINDOWS.

$$

LAT...LON 2885 8149 2869 8159 2841 8111 2862 8097

JP

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 Apr 4, 2:30 PM EST, 3 hours 5 minutes earlier.

Area forecast discussion, Apr 4, 2:30 PM EST, 3 hours 5 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
230 PM EST THU APR 4 2002

TODAY/TONIGHT...1032 MB HIGH PRESSURE CENTER BUILDS SOUTH FROM
MIDWEST WITH PGRAD INCREASING OVER PENINSULA BETWEEN THIS HIGH AND
ATLANTIC LOW...WITH WEAK TRAILING FRONT/WIND SHIFT REACHING ACROSS
SOCEN PENINSULA WITH DEW POINT BOUNDARY BACK ACROSS NRN PENINSULA.
FRONT WILL CONTINUE TO DIMINISH AS IT DRIFTS SOUTH TODAY. NORTHWEST
WINDS EARLY IN THE DAY WILL BECOME N TO NE AS SURGE HIGHER WITH HIGH
BUILDING IN...WILL LEAVE BREEZY MENTION FOR ALL LOCATIONS. AS DRIER
AND MORE STABLE ARE FILTERS IN...PRECIP IS NOT EXPECTED TODAY WITH
THE ONLY POSSIBLE EXCEPTION OF THE FAR SOUTH CWA...BUT PROSPECTS TOO
LOW TO WARRANT A ZONE MENTION. SKIES SHOULD AVERAGE PARTLY CLOUDY
BUT WILL HAVE TO KEEP AN EYE ON EXTENT OF MARINE STRATOCU BY LATER
TODAY WITH FLOW VEERING TO MORE NELY COMPONENT. SEVERAL DEGREES
COOLER TODAY THAN ON THURS FOR ALL AREAS THEN ONSHORE COMPONENT NEAR
THE COAST TONIGHT SHOULD HOLD MINS UP SEVERAL DEGREES WARMER THAN
THE INTERIOR. MESOETA STILL INDICATING ENOUGH LOW LEVEL MOISTURE AND
ONSHORE FLOW OVERNIGHT INTO SAT TO KEEP A LOW POP MENTION IN FOR
SOUTHERN COASTAL SECTIONS.

SAT-MON...SURFACE HIGH CENTER DRIFTS EAST AND MOVES OFF THE MID
ATLANTIC COAST SUNDAY. HEIGHTS RISE AS H5 RIDGE CRESTS OVER THE
PENINSULA SUNDAY INTO MON. WINDS WILL VEER FROM NE TO ELY SAT INTO
SUNDAY AND SELY MON. PGRAD REMAINS TIGHT ENOUGH THAT WINDY OR BREEZY
MENTION WILL BE CONTINUED FOR ALL ZONES OVER THE WEEKEND. MAY STILL
BE BREEZY NEAR THE COAST MONDAY BUT PGRAD WILL BEGIN TO SLACKEN A
BIT BY THEN. A FEW COASTAL SHOWERS WILL MOVE ONSHORE FLOW DURING THE
OVERNIGHT AND MORNING HOURS. ONSHORE FLOW WILL KEEP TEMPS MODERATED
BUT GETTING A LITTLE WARMER EACH DAY.

TUE-THU...CONTINUATION OF WEAKENING PGRAD AND SE-S FLOW DURING THE
MID WEEK. PWAT VALUES CREEPING BACK UP AND MAY HAVE A FEW AFTERNOON
SHOWERS/STORMS MID WEEK OVER THE INTERIOR SECTIONS.

MARINE...NW WINDS 10-15KT AND SEAS 2-3 FT AT BUOY 41009 EARLY THIS
MORNING. NWW3 00Z OUTPUT NOT RAISING SEAS TO 7FT AT THIS LOCATION
UNTIL SATURDAY BUT AS WINDS PICK UP TODAY SEAS IN THE GULF STREAM
SHOULD REACH THIS THRESHOLD. PLAN TO RAISE SCA FOR THE GULF STREAM
WATERS WITH MORNING PACKAGE ISSUANCE AND MAY BE NEEDED FOR ALL OF
THE EC FL WATERS BY TONIGHT OR EARLY SATURDAY. WINDS AND SEAS WILL
REMAIN HIGH ENOUGH TO CONTINUE ADVISORIES OVER THE WEEKEND AND MAY
LINGER INTO MONDAY.

PRELIMINARY CCF...
DAB BB 074/058 073/060 075 0112
MCO BB 079/056 077/055 079 000-
MLB BB 077/062 075/063 077 1222

.MLB...SCA GULF STREAM WATERS FLAGLER BEACH TO JUPITER INLET.

PUBLIC/MARINE...GLITTO
AVIATION/FIRE WX...GITTINGER

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 4, 6:19 PM ESTSevere Thunderstorm WarningMLBOrange, Seminole56 min

Nearby

Severe Thunderstorm Warnings in Florida, 2002Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.