Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 35, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Mar 20, 1998, 6:07 PM EST for Monroe County, Florida. It was in force for 78 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Mar 20, 1998, 6:07 PM EST (23:07 UTC)
- Expired
- Mar 20, 1998, 7:25 PM EST
- In force
- 78 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 23:07 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.
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 11.1 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
- 254 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 655 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
716 WUUS1 KMIA 202308 RRA SVRMIA AMZ654-674-675-FLC087-210025- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 607 PM EST FRI MAR 20 1998 THE NATIONAL WEATHER SERVICE IN MIAMI FL HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 725 PM EST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHERN FLORIDA ...MONROE LOWER KEYS INCLUDING ADJACENT COASTAL WATERS AT 605 PM EST... DOPPLER RADAR INDICATED AN AREA OF SEVERE THUNDERSTORMS LOCATED NEAR THE MARQUESAS KEYS. THE STORMS ARE MOVING EAST AT 25 MPH AND WILL AFFECT THE LOWER KEYS INCLUDING KEY WEST DURING THE NEXT HOUR. 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. DPB
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.
In the hours before
Special weather statement, Mar 20, 1:40 PM EST, 4 hours 27 minutes before
FLZ063-066>068-202345- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 140 PM EST FRI MAR 20 1998 A FLOOD WATCH CONTINUE IN EFFECT THIS AFTERNOON FOR GLADES.. HENDRY... AND PALM BEACH COUNTIES. AS OF 120 PM DOPPLER RADAR INDICATED ONLY LIGHT SHOWERS OVER PARTS OF GLADES COUNTY. HOWEVER... A AREA OF SHOWERS AND THUNDERSTORMS HAS FORMED IN THE EASTERN GULF OF MEXICO WEST OF COLLIER COUNTY AND WAS MOVING EAST NORTHEAST TOWARD THE COAST. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO SPREAD SOUTH AND EAST ACROSS THE WATCH AREA THE REMAINDER OF THE AFTERNOON. ONE TO THREE INCHES OF RAINFALL ARE POSSIBLE AND THIS COULD PRODUCE SOME FLOODING OF MAINLY LOW-LYING EASILY FLOODED AREAS. RESIDENTS SHOULD KEEP IN TOUCH WITH LATER STATEMENTS AND/OR POSSIBLE WARNINGS.
Special weather statement, Mar 20, 3:32 PM EST, 2 hours 35 minutes before
AMZ610-650-656-670-676-FLZ063-066>070-202330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 332 PM EST FRI MAR 20 1998 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 7 PM EST... A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL 7 PM FOR GLADES.. HENDRY.. COLLIER.. AND PALM BEACH COUNTIES. NO SEVERE WEATHER WAS OCCURRING AS OF 320 PM. HOWEVER STRONG THUNDERSTORMS HAD DEVELOPED ACROSS THE AREA JUST NORTH OF LAKE OKEECHOBEE AND ALSO OVER THE SOUTHEAST GULF OF MEXICO FROM JUST OFF THE COAST OF COLLIER COUNTY TO WEST OF THE DRY TORTUGAS. THESE THUNDERSTORMS ARE EXPECTED TO AFFECT THE AREA FROM ABOUT 4 PM ONWARD THROUGH SUNSET. STRONG DAMAGING WIND GUSTS AS WELL AS SOME HAIL IS STILL POSSIBLE IN THIS AREA AS THESE THUNDERSTORMS MOVE THROUGH. IN ADDITION... WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WERE DEVELOPING OVER MOST OF SOUTH FLORIDA AND OFFSHORE THE DADE COUNTY AND UPPER KEYS COAST. PERSONS IN THE WATCH AREA AND ALSO THE REMAINDER OF SOUTH FLORIDA SHOULD KEEP A CLOSE EYE ON THE WEATHER DURING THE REMAINDER OF THE AFTERNOON AND EARLY EVENING HOURS.
Special weather statement, Mar 20, 3:32 PM EST, 2 hours 35 minutes before
AMZ610-650-656-670-676-FLZ063-066>070-202330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 332 PM EST FRI MAR 20 1998 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 7 PM EST... A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL 7 PM FOR GLADES.. HENDRY.. COLLIER.. AND PALM BEACH COUNTIES. NO SEVERE WEATHER WAS OCCURRING AS OF 320 PM. HOWEVER STRONG THUNDERSTORMS HAD DEVELOPED ACROSS THE AREA JUST NORTH OF LAKE OKEECHOBEE AND ALSO OVER THE SOUTHEAST GULF OF MEXICO FROM JUST OFF THE COAST OF COLLIER COUNTY TO WEST OF THE DRY TORTUGAS. THESE THUNDERSTORMS ARE EXPECTED TO AFFECT THE AREA FROM ABOUT 4 PM ONWARD THROUGH SUNSET. STRONG DAMAGING WIND GUSTS AS WELL AS SOME HAIL IS STILL POSSIBLE IN THIS AREA AS THESE THUNDERSTORMS MOVE THROUGH. IN ADDITION... WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WERE DEVELOPING OVER MOST OF SOUTH FLORIDA AND OFFSHORE THE DADE COUNTY AND UPPER KEYS COAST. PERSONS IN THE WATCH AREA AND ALSO THE REMAINDER OF SOUTH FLORIDA SHOULD KEEP A CLOSE EYE ON THE WEATHER DURING THE REMAINDER OF THE AFTERNOON AND EARLY EVENING HOURS.
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 10:39 PM EST | Severe Thunderstorm Warning | MFL | Collier | 61 min |
| Mar 19, 11:53 PM EST | Severe Thunderstorm Warning | MFL | Broward | 62 min |
| Mar 20, 12:25 AM EST | Severe Thunderstorm Warning | MFL | Miami-Dade | 60 min |
| Mar 20, 12:49 AM EST | Severe Thunderstorm Warning | MFL | Miami-Dade | 61 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.