Alert archive / Florida / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 74, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Jul 7, 1997, 7:55 PM EDT for Volusia County, Florida. It was in force for 35 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
- Jul 7, 1997, 7:55 PM EDT (23:55 UTC)
- Expired
- Jul 7, 1997, 8:30 PM EDT
- In force
- 35 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
County Volusia County, FL
The radar
The Melbourne radar (KMLB), 116 km from the middle of the area, began a volume at 23:58 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 |
|---|---|---|---|
| Jul 7, 8:20 PM EDT | Thunderstorm Wind | Deltona, FL | Thunderstorm winds blew down trees and power lines in Deltona. |
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
Jacksonville, FL (KJAX), launched 12:00Z, 11.9 hours before the alert went out and 168 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.
- Mixed-layer CAPE
- 1228 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 730 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
509 WUUS01 KMLB 072357 RRA SVRMLB FLC127-080030- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MELBOURNE FL 755 PM EDT MON JUL 7 1997 THE NATIONAL WEATHER SERVICE IN MELBOURNE FL HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 830 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN EAST CENTRAL FLORIDA ...SOUTHERN VOLUSIA COUNTY AT 754 PM DOPPLER RADAR INDICATED A SEVERE STORM 5 MILES NORTHEAST OF DELTONA. THE STORM IS MOVING SOUTH AT 20 MPH AND WILL AFFECT AREAS NEAR DELTONA...OSTEEN AND LAKE MONROE. 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.
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 7, 2:44 PM EDT, 5 hours 11 minutes earlier.
Area forecast discussion, Jul 7, 2:44 PM EDT, 5 hours 11 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 242 PM EDT MON JUL 7 1997 A FEW CELLS STARTING TO DEVELOP ALONG SEABREEZE IN SRN COUNTIES CURRENTLY...ALSO STORMS MOVING ACROSS N FL. STORMS SHOULD INCREASE OVER INTERIOR AND NRN SECTIONS THROUGH THE LATE AFTERNOON/EARLY EVE HOURS AS BOUNDARIES COLLIDE. DRIER AIR SETTING IN FROM SOUTH THROUGH TUESDAY AND LOW/MID LEVEL RIDGE AXIS WILL CONTINUE ACROSS C FL AND LIMIT POP COVERAGE ON TUES. LOWEST POPS WILL BE IN SRN E COAST COUNTIES TUES WITH DRIER AIR AND EARLIER E COAST SEABREEZE ONSET AND A LITTLE HIGHER OVER NRN AND INTERIOR SECTIONS. FWC/FAN TEMPS AND POPS ON OK AGREEMENT BUT PREFER THE SLIGHTLY DRIER FAN POPS WHERE THEY DIFFER. GLITTO
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 6:53 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 62 min |
| Jul 7, 7:50 PM EDT | Severe Thunderstorm Warning | MLB | Seminole | 40 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1997Every 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.