Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 98, NWS Melbourne, FL

August 13, 1997Orange County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 13, 1997, 6:23 PM EDT for Orange County, Seminole County, Florida. It was in force for 32 min. 3 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: Aug 13, 1997, 6:23 PM EDT (22:23 UTC)
Expired: Aug 13, 1997, 6:55 PM EDT
In force: 32 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 22:26 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

Time	Report	Where	Remark
Aug 13, 6:30 PM EDT	Thunderstorm Wind	Apopka, FL	Several large trees were blown down in Wekiwa Springs State Park.
Aug 13, 6:30 PM EDT	Hail 0.75	Lake Mary, FL
Aug 13, 6:35 PM EDT	Thunderstorm Wind	Altamonte Spgs, FL	Several large trees were blown down near Altamonte Springs.

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

Tampa Bay, FL (KTBW), launched 12:00Z, 10.4 hours before the alert went out and 150 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: 2820 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 714 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 7 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 
TTAA00 KMLB 132223 RRA
SVRMLB
FLC095-117-132255-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
623 PM EDT WED AUG 13 1997

THE NATIONAL WEATHER SERVICE IN MELBOURNE FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 655 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN EAST CENTRAL FLORIDA

   ...SEMINOLE COUNTY
   ...ORANGE COUNTY
 
AT 620 PM...DOPPLER RADAR IN MELBOURNE INDICATED A SEVERE STORM
NEAR ALTAMONTE SSPRINGS JUST EAST OF I-4. THE STORM WAS MOVING SOUTH
AND WILL REACH AREAS BETWEEN MAITLAND AND WINTER PARK BETWEEN 630
AND 645 PM. EARLIER STORMS IN VOLUSIA COUNTY PRODUCED ONE INCH HAIL
AND WIND DAMAGE.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 58
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF A STRONG BUILDING. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

Nearby

Severe Thunderstorm Warnings in Florida, 1997 Every severe thunderstorm warning in 1997

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.