Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 67, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Jul 4, 1998, 4:58 PM EDT for Monroe County, Florida. It was in force for 47 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 4, 1998, 4:58 PM EDT (20:58 UTC)
- Expired
- Jul 4, 1998, 5:45 PM EDT
- In force
- 47 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Monroe County, FL
The radar
The Miami radar (KAMX), 51 km from the middle of the area, began a volume at 20:57 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 4, 5:20 PM EDT | Thunderstorm Wind 65 | Marathon, FL | ASOS at Marathon Airport recorded 50 knots at 1620 EDT. The C-MAN at Sombrero Key recorded 59 knots. A storm spotter estimated wind gusts of 65 knots. Signs and trees were downed throughout the Marathon area. Several boats were swamped. Five people were knocke |
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
Miami, FL (KMFL), launched 12:00Z, 9.0 hours before the alert went out and 69 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
- 1054 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1476 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 56 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 042058 RRA SVRMIA FLC087-042145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 458 PM EDT SAT JUL 4 1998 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MONROE MIDDLE KEYS IN SOUTHERN FLORIDA MONROE LOWER KEYS IN SOUTHERN FLORIDA * UNTIL 545 PM EDT * AT 455 PM A SEVERE THUNDERSTORM WAS INDICATED OVER FLORIDA BAY 10 MILES NORTH OF MARATHON IN THE MIDDLE KEYS. THE STORM IS MOVING SOUTH AT 15 TO 20 MPH. DAMAGING WIND GUSTS IN EXCESS OF 60 MPH AND LARGE HAIL ARE LIKELY WITH THIS STORM. TAKE COVER IMMEDIATELY!! * SOME LOCATIONS AFFECTED INCLUDE MARATHON TO DUCK KEY BETWEEN 505 AND 510 PM AND BAHIA HONDA KEY BY 515 PM. 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 AWAY FROM WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES. IF YOU ARE CAUGHT OUTSIDE...SEEK REFUGE FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN... AND DEADLY LIGHTNING ARE ALL POSSIBLE IN A SEVERE THUNDERSTORM. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 3:00 PM EDT | Severe Thunderstorm Warning | MFL | Collier | 65 min |
| Jul 4, 3:18 PM EDT | Severe Thunderstorm Warning | MFL | Miami-Dade | 57 min |
| Jul 4, 6:18 PM EDT | Severe Thunderstorm Warning | MFL | Miami-Dade | 47 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1998Every severe thunderstorm warning in 1998
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.