Alert archive / Florida / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 67, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Jun 20, 1997, 7:53 PM EDT for Glades County, Florida. It was in force for 62 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
- Jun 20, 1997, 7:53 PM EDT (23:53 UTC)
- Expired
- Jun 20, 1997, 8:55 PM EDT
- In force
- 62 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Glades County, FL
The radar
The Melbourne radar (KMLB), 139 km from the middle of the area, began a volume at 23:53 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 |
|---|---|---|---|
| Jun 20, 8:45 PM EDT | Tornado F0 | Ortona, FL | reported by glades county e.m. near muce 10nm w of ortona. |
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, 11.9 hours before the alert went out and 146 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
- 1906 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 799 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -55 m²/s²
- 0-3 km storm-relative helicity
- -62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMIA 202354 RRA SVRMIA FLC043-210055- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 753 PM EDT FRI JUN 20 1997 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 855 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH FLORIDA ...WESTERN GLADES COUNTY AT 750 PM...MIAMI DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS JUST NORTHWEST OF GLADES COUNTY. THESE STORMS WILL MOVE INTO THE COUNTY BY 815 PM. THESE STORMS WILL MOVE SOUTHEAST AT 10 MPH. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH... LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. SEEK SHELTER IN A STRONG BUILDING. STAY dAWAY FROM WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES.
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 9:37 PM EDT | Severe Thunderstorm Warning | MFL | Palm Beach | 88 min |
| Jun 20, 12:11 AM EDT | Severe Thunderstorm Warning | MFL | Broward, Miami-Dade | 64 min |
| Jun 20, 5:04 PM EDT | Severe Thunderstorm Warning | MFL | Miami-Dade | 56 min |
| Jun 20, 5:47 PM EDT | Severe Thunderstorm Warning | MFL | Monroe | 58 min |
| Jun 20, 6:51 PM EDT | Severe Thunderstorm Warning | MFL | Monroe | 59 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.