Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 21, NWS Melbourne, FL

May 27, 1997Orange County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 27, 1997, 7:07 PM EDT for Orange County, Florida. It was in force for 63 min. 1 report 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: May 27, 1997, 7:07 PM EDT (23:07 UTC)
Expired: May 27, 1997, 8:10 PM EDT
In force: 63 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Orange County, FL

The radar

The Melbourne radar (KMLB), 79 km from the middle of the area, began a volume at 23:10 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
May 27, 7:30 PM EDT	Hail 1.75	Orlando, FL	Golf ball size hail was reported in Orlando.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 27, 5:30 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 11.1 hours before the alert went out and 139 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: 1099 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: -3 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

618 
WUUS01 KMLB 272307 RRA
SVRMLB
FLC095-280010-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
707 PM EDT TUE MAY 27 1997

THE NATIONAL WEATHER SERVICE IN MELBOURNE FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 810 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN EAST CENTRAL FLORIDA

   ...ORANGE COUNTY
 
AT 705 PM EDT...A SEVERE THUNDERSTORMS WAS DETECTED IN THE VICINITY
OF DOWNTOWN ORLANDO MOVING SLOWLY SOUTHEAST.
 
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
DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

SHARP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 5:37 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	63 min
May 27, 6:07 PM EDT	Severe Thunderstorm Warning	MLB	Seminole	58 min

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.