Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 25, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Mar 9, 1998, 4:21 AM EST for Collier County, Florida. It was in force for 34 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 9, 1998, 4:21 AM EST (09:21 UTC)
- Expired
- Mar 9, 1998, 4:55 AM EST
- In force
- 34 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Collier County, FL
The radar
The Miami radar (KAMX), 111 km from the middle of the area, began a volume at 09:22 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 9, 1:00 AM EST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Miami, FL (KMFL), launched 00:00Z, 9.4 hours before the alert went out and 113 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
- 1605 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 557 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 7.3
The text
As transmitted, in the capitals the NWS used until 2016.
518 WUUS1 KMIA 090923 RRA SVRMIA FLC021-090955- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 421 AM EST MON MAR 9 1998 THE NATIONAL WEATHER SERVICE IN MIAMI FL HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 455 AM EST FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWESTERN FLORIDA ...EASTERN COLLIER COUNTY AT 419 AM EST... DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS OVER EASTERN COLLIER COUNTY FROM JUST EAST OF SUNNILAND TO EVERGLADES CITY MOVING EAST AT 40 MPH. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER... SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. REMAIN ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS.
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 2:41 AM EST | Severe Thunderstorm Warning | MFL | Collier | 59 min |
| Mar 9, 3:22 AM EST | Severe Thunderstorm Warning | MFL | Collier, Glades, Hendry | 63 min |
| Mar 9, 4:09 AM EST | Severe Thunderstorm Warning | MFL | Palm Beach | 31 min |
| Mar 9, 4:41 AM EST | Severe Thunderstorm Warning | MFL | Palm Beach | 64 min |
| Mar 9, 5:33 AM EST | Tornado Warning | MFL | Broward | 32 min |
| Mar 9, 5:54 AM EST | Tornado Warning | MFL | Miami-Dade | 21 min |
| Mar 9, 6:06 AM EST | Tornado Warning | MFL | Broward | 29 min |
| Mar 9, 6:18 AM EST | Severe Thunderstorm Warning | MFL | Miami-Dade | 62 min |
| Mar 9, 7:43 AM EST | Severe Thunderstorm Warning | MFL | Miami-Dade | 47 min |
| Mar 9, 8:09 AM EST | Severe Thunderstorm Warning | MFL | Monroe | 91 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.