Alert archive / Florida / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 1, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Jan 4, 1987, 11:17 AM EST for Collier County, Florida. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Jan 4, 1987, 11:17 AM EST (16:17 UTC)
- Expired
- Jan 4, 1987, 12:15 PM EST
- In force
- 58 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Collier County, FL
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Key West, FL (KEYW), launched 12:00Z, 4.3 hours before the alert went out and 174 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
- 484 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 721 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMIA 041617 SVRMIA FLC021-041715- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING NATIONAL WEATHER SERVICE MIAMI FL 1117 AM EST SUN JAN 4 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING EFFECTIVE UNTIL 1215 PM EST FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHWEST FLORIDA...WESTERN COLLIER ...THIS WARNING ALSO INCLUDES THE ADJACENT COASTAL WATERS FOR THE COUNTY JUST MENTIONED A STRONG LINE OF THUNDERSTORMS FROM NEAR NAPLES SOUTHWEST INTO THE GULF OF MEXICO IS MOVING EAST 25 KTS. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER.. SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE IMMEDIATELY..AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR SEVERE WEATHER REPORTS TO THE LOCAL NATIONAL WEATHER SERVICE OFFICE.
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, Jan 4, 9:51 AM EST, 1 hour 26 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 945 AM EST SUN JAN 4 1987 ...A TORNADO WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL AND SOUTH FLORIDA THROUGH 3PM EST THIS AFTERNOON... AT 945 AM...AN AREA OF RAIN WITH A FEW THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL EXTENDED FROM NEAR LAKE WALES SOUTHWEST TO NEAR THE FORT MYERS METROPOLITAN AREA TO JUST WEST OF THE DRY TORTUGAS. THE HEAVIEST THUNDERSTORMS WERE JUST SOUTHWEST OF FORT MYERS. ANOTHER AREA OF RAIN WITH ISOLATED THUNDERSTORMS PRODUCING VERY HEAVY RAIN EXTENDED FROM JUST EAST OF DADE...BROWARD AND THE UPPER KEYS TO OVER THE WESTERN BAHAMA ISLANDS AND SOUTH TO THE NORTHERN COAST OF CUBA. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR.
Special weather statement, Jan 4, 10:45 AM EST, 32 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 1045 AM EST SUN JAN 4 1987 ...A TORNADO WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL AND SOUTH FLORIDA THROUGH 3PM EST THIS AFTERNOON... AT 1045 AM...A LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDED FROM JUST NORTHEAST OF FORT MYERS TO OVER THE GULF NEAR THE DRY TORTUGAS. THE HEAVIEST THUNDERSTORMS WERE APPROACHING THE NAPLES AREA. THIS LINE IS PART OF A LARGER RAIN AREA THAT ACROSS THE PENINSULA MAINLY NORTH OF VERO BEACH TO CAPE ROMANO LINE. THE LINE WAS MOVING SOUTHEAST AT NEAR 30 MILES AN HOUR. LARGE PATCHES OF RAIN WITH SEVERAL EMBEDDED THUNDERSTORMS CONTINUED OVER THE ATLANTIC BETWEEN THE SOUTHEAST FLORIDA COAST AND ANDROS ISLAND. THE RAIN AREA EXTENDED SOUTH TO CAY SAL. ISOLATED SHOWERS WERE ALSO LOCATED OVER EXTREME WESTERN DADE COUNTY AND OVER THE BERRY ISLANDS OF THE BAHAMAS. THE THUNDERSTORMS WERE MOVING NORTHEAST 30 MILES AN HOUR.
Nearby
Severe Thunderstorm Warnings in Florida, 1987Every severe thunderstorm warning in 1987
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.