Alert archive / Florida / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 34, NWS Melbourne, FL

July 20, 2002Orange County, Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 20, 2002, 4:27 PM EDT for Orange County, Osceola County, Florida. It was in force for 63 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 20, 2002, 4:27 PM EDT (20:27 UTC)
Expired: Jul 20, 2002, 5:30 PM EDT
In force: 63 min
Issued by: NWS Melbourne, FL
Area: Whole counties

Counties Orange County, FL, Osceola County, FL

The radar

The Melbourne radar (KMLB), 60 km from the middle of the area, began a volume at 20:30 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

Tampa Bay, FL (KTBW), launched 12:00Z, 8.5 hours before the alert went out and 132 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: 3682 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 586 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 20 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.

278 
WUUS52 KMLB 202027
SVRMLB
FLC095-097-202130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
427 PM EDT SAT JUL 20 2002

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL ORANGE COUNTY
  NORTHERN OSCEOLA COUNTY
  IN EAST CENTRAL FLORIDA

* UNTIL 530 PM EDT.

* AT 425 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
SEVERE THUNDERSTORMS FROM HOLOPAW TO ALLIGATOR LAKE. THESE STORMS 
WERE DEVELOPING NORTHWESTWARD TOWARDS NARCOOSSEE AND ORANGE COUNTY.

* OTHER STRONG TO SEVERE STORMS WILL DEVELOP FROM NEAR ORLANDO 
INTERNATIONAL AIRPORT TO METRO ORLANDO AND PINE HILLS.

LARGE HAIL...EXCESSIVE LIGHTNING AND DAMAGING WINDS ARE LIKELY. TAKE
COVER IN A STURDY BUILDING UNTIL THE STORM PASSES.

$$

LAT...LON 2808 8112 2818 8096 2854 8121 2841 8142

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 20, 2:22 PM EDT, 2 hours 5 minutes earlier.

Area forecast discussion, Jul 20, 2:22 PM EDT, 2 hours 5 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
222 PM EDT SAT JUL 20 2002

CURRENT WEATHER...SURFACE RIDGE AXIS SITUATED OVER SOUTH FLORIDA.
SURFACE TO 700MB RIDGE PERSISTS OVER FLORIDA/EASTERN GULF OF MEXICO.
ABOVE 700MB WEAK TROUGHING EXTENDS ALONG THE EASTERN SEABOARD DOWN
TO GEORGIA. TAILEND OF A SURFACE FRONT/TROUGH...PARENT LOW LOCATED
OFF NEW ENGLAND STATES...STRETCHES ACROSS NORTH FLORIDA...BIG BEND
AREA AND TOWARD MISSISSIPPI DELTA. WEAK BAND OF VORTICITY AHEAD OF
THE FRONT/TROUGH WAS HELPING TO ENHANCE CONVECTION OVER THE SOUTHERN
FORECAST AREA. RADAR WAS DEPICTING A FEW POP UP SHOWERS OVER THE
INTERIOR AND A PERSISTENT AREA OF SHOWERS OVER EASTERN MARTIN COUNTY.
LASTLY...WATER VAPOR LOOP SHOWS TROUGH MOVING EAST SOUTHEAST ACROSS
THE OHIO/TENNESSEE RIVER VALLEYS.

DISCUSSION...THE WEAK FRONT WILL PUSH ACROSS THE SOUTHEAST STATES
AND INTO THE WESTERN ATLANTIC. THIS WILL KEEP SURFACE RIDGE AXIS
WELL SOUTH OF CENTRAL FLORIDA THROUGH MONDAY. LOW LEVEL MOISTURE
FIELD REMAINS AROUND 1 3/4 TO 2 INCHES OF PRECIPITABLE WATER THROUGH
THE FORECAST CYCLE AND SEA BREEZES JUSTIFY AFTERNOON AND EVENING
STORMS EACH DAY. GFS MAINTAINS TROUGHING OVER THE SOUTHEAST THROUGH
THURSDAY THEN BY NEXT SATURDAY...LIFTS THE FRONT OFF THE MID
ATLANTIC REGION. HIGH PRESSURE RIDGE AXIS SHIFTS TO NORTH FLORIDA BY
SUNDAY BRINGING BACK AN EASTERLY FLOW TO THE AREA.

AS LONG AS THE RIDGE AXIS REMAINS TO OUR SOUTH THE BASIC FORECAST
WILL NOT CHANGE THAT MUCH. AFTERNOON AND EARLY EVENING LIGHTNING
STORMS EACH DAY. AFTERNOON SEA BREEZES WILL HOLD DOWN DOWN DAILY
HIGHS ALONG THE COAST A DEGREE OR TWO...BUT STILL FORECASTING
AROUND 90 DEGREES COASTAL...AND LOW TO MID 90S FOR THE INTERIOR.

COASTAL WATERS FORECAST...SOUTH TO SOUTHWESTERLY FLOW WILL PERSIST.
WINDS MAY INCREASE OVER THE NORTHERN LEG MONDAY AND TUESDAY AS
GRADIENT STRENGTHENS A LITTLE BETWEEN LOW PRESSURE OVER THE
SOUTHEAST STATES AND THE HIGH PRESSURE OVER THE BAHAMAS...FLORIDA
STRAITS AND SOUTH FLORIDA.

DAB TT 075/093 075/093 075 2635
MCO TT 075/093 075/092 075 2535
MLB TT 076/090 076/090 075 2535

.MLB...NONE.

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

In the hours before

Local storm report, Jul 20, 2:59 PM EDT, 1 hour 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
259 PM EDT SAT JUL 20 2002

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

257 PM     TITUSVILLE                FL   1.00 INCH HAIL
07/20/02   BREVARD                        TITUSVILLE POLICE REPORTS
                                          VERY LARGE HAIL OVER THE
                                          SOUTH PART OF TITUSVILLE
                                          ALONG WITH TREE FIRES
                                          STARTED BY LIGHTNING.

Local storm report, Jul 20, 3:27 PM EDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
327 PM EDT SAT JUL 20 2002

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....
305 PM     TITUSVILLE                FL   0.75 INCH HAIL
07/20/02   BREVARD                        A CAPE CANAVERAL EMPLOYEE
                                          REPORTED LARGE HAIL IN
                                          DOWNTOWN TITUSVILLE.
                                          SMALL HAIL WAS REPORTED
                                          IN THE MELBOURNE AREA
                                          EARLIER AT 1:36 PM.

Local storm report, Jul 20, 3:32 PM EDT, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
332 PM EDT SAT JUL 20 2002

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

230 PM     MELBOURNE                 FL   48 MPH WIND GUST
07/20/02   BREVARD                        THE MELBOURNE INTL
                                          AIRPORT REPORTED WIND
                                          GUST.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 2:45 PM EDT	Special Marine Warning	MLB		105 min
Jul 20, 2:45 PM EDT	Special Marine Warning	MLB		105 min
Jul 20, 2:51 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	54 min
Jul 20, 3:50 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	40 min
Jul 20, 4:56 PM EDT	Severe Thunderstorm Warning	MLB	Seminole	34 min
Jul 20, 5:52 PM EDT	Severe Thunderstorm Warning	MLB	Lake	53 min

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.