Alert archive / Florida / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 15, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Aug 11, 1990, 8:06 PM EDT for Glades County, Florida. It was in force for 54 min.
The area
The counties it named.
The facts
- Issued
- Aug 11, 1990, 8:06 PM EDT (00:06 UTC)
- Expired
- Aug 11, 1990, 9:00 PM EDT
- In force
- 54 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Glades 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
Tampa Bay, FL (KTBW), launched 00:00Z, 0.1 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- NaN m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMIA 120007 SVRMIA FLC043-120100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 806 PM EDT SAT AUG 11 1990 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTH FLORIDA ...CENTRAL GLADES COUNTY AT 800 PM RADAR INDICATED A SEVERE THUNDERSTORM IN BETWEEN CALUSA AND PALMDALE IN GLADES COUNTY. THE STORM WAS MOVING SLOWLY SOUTH. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY LIGHTNING ARE ALL POSSIBLE IN A SEVERE THUNDERSTORM. SEEK SHELTER IN A STRONG BUILDING. STAY AWAY FROM WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES. A MOBILE HOME IS NOT A SAFE REFUGE FROM A SEVERE THUNDERSTORM...MOVE TO A MORE SUBSTANTIAL BUILDING. IF THREATENING WEATHER IS SIGHTED...TAKE SHELTER...THEN ASK A LAW ENFORCEMENT AGENCY TO RELAY YOUR SEVERE WEATHER REPORT 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, Aug 11, 3:51 PM EDT, 4 hours 15 minutes before
FLZ020-020-020-112200- SPECIAL WEATHER AND MARINE STATEMENT NATIONAL WEATHER SERVICE WEST PALM BEACH FL 353 PM EDT SAT AUG 11 1990 RADAR SHOWED CLUSTERS OF THUNDESTORMS OVER EASTERN PALM BEACH...MARTIN AND ST LUCIE COUNTIES. THESE THUNDERSTORMS HAD PERSISTED FOR THE PAST COUPLE OF HOURS AND NOW HAD INTENSIFIED OVER THE LAKE WORTH AREA AND WEST OF PALM BEACH GARDENS. MOVEMENT HAD BEEN SLOW AND GENERALLY TOWARD THE COAST. THESE THUNDERSTORMS WOULD PRODUCE VERY HEAVY RAINS IN A VERY SHORT TIME CAUSING FLOODING IN LOW PLACES AND ON SOME ROADWAYS. FREQUENT LIGHTNING STRIKES WERE LIKELY. THUNDERSTORMS MAY DEVELOP OVER AREAS OF PALM BEACH...MARTIN AND ST LUCIE COUNTIES THAT HAVE NOT HAD RAIN YET THIS AFTERNOON. RESIDENTS AND BOATERS SHOULD BE ALERT FOR THESE STRONG THUNDERSTORMS. NNNN
Special weather statement, Aug 11, 3:57 PM EDT, 4 hours 9 minutes before
FLZ020-020-020-112200- SPECIAL WEATHER AND MARINE STATEMENT NATIONAL WEATHER SERVICE WEST PALM BEACH FL 353 PM EDT SAT AUG 11 1990 RADAR SHOWED CLUSTERS OF THUNDESTORMS OVER EASTERN PALM BEACH...MARTIN AND ST LUCIE COUNTIES. THESE THUNDERSTORMS HAD PERSISTED FOR THE PAST COUPLE OF HOURS AND NOW HAD INTENSIFIED OVER THE LAKE WORTH AREA AND WEST OF PALM BEACH GARDENS. MOVEMENT HAD BEEN SLOW AND GENERALLY TOWARD THE COAST. THESE THUNDERSTORMS WOULD PRODUCE VERY HEAVY RAINS IN A VERY SHORT TIME CAUSING FLOODING IN LOW PLACES AND ON SOME ROADWAYS. FREQUENT LIGHTNING STRIKES WERE LIKELY. THUNDERSTORMS MAY DEVELOP OVER AREAS OF PALM BEACH...MARTIN AND ST LUCIE COUNTIES THAT HAVE NOT HAD RAIN YET THIS AFTERNOON. RESIDENTS AND BOATERS SHOULD BE ALERT FOR THESE STRONG THUNDERSTORMS. NNNN
Special weather statement, Aug 11, 4:03 PM EDT, 4 hours 3 minutes before
FLZ022-112100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 358 PM EDT SAT AUG 11 1990 ...THUNDERSTORMS INTENSIFYING IN BROWARD AND DADE COUNTIES... AT 350 PM EDT SATELLITE AND RADAR SHOWED THAT THUNDERSTORMS WERE BEGINNING TO DEVELOP RAPIDLY IN DADE AND BROWARD COUNTIES. THE STORMS EXTENDED FROM NEAR HOMESTEAD NORTHWARD TO NEAR MIAMI LAKES AND ACROSS BROWARD COUNTY TO NEAR TAMARAC. THESE THUNDERSTORMS ARE MOVING SLOWLY NORTHEASTWARD TOWARD THE COAST. THE STORMS WILL CONTINUE TO PRODUCE FREQUENT LIGHTNING...STRONG GUSTY WINDS AND POSSIBLY SOME SMALL HAIL UNTIL ABOUT 500 PM. PERSONS ENGAGED IN ANY OUTSIDE ACTIVITY SHOULD SEEK PROTECTION INSIDE UNTIL THE THREAT FROM THESE STORMS HAS ENDED.
Special weather statement, Aug 11, 5:11 PM EDT, 2 hours 55 minutes before
FLZ022-112315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 509 PM EDT SAT AUG 11 1990 ...THUNDERSTORMS CONTINUE IN BROWARD COUNTY... AT 503 PM RADAR INDICATED THE STRONGEST THUNDERSTORM IN BROWARD COUNTY WAS WEST OF CORAL SPRINGS. MOST OF THE REST OF EASTERN BROWARD COUNTY WAS RECEIVING RAIN FROM EARLIER THUNDERSTORMS. AS OF 500 PM THE THUNDERSTORM WARNING FOR WESTERN BROWARD COUNTY HAD EXPIRED. FOR THE NEXT COUPLE OF HOURS THE THUNDERSTORMS IN BROWARD COUNTY SHOULD BE DECREASING. HOWEVER PEOPLE SHOULD STILL CONTINUE TO AVOID OUTSIDE ACTIVITIES UNTIL THE THREAT FROM THESE THUNDERSTORMS HAS ENDED.
Special weather statement, Aug 11, 5:45 PM EDT, 2 hours 21 minutes before
FLZ015>023-112235- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 545 PM EDT SAT AUG 11 1990 AT 534 PM RADAR INDICATED CLUSTERS OF STRONG THUNDERSTORMS WITH VERY HEAVY RAIN BLANKETING THE SOUTHERN PENINSULA SOUTH OF A VERO BEACH/FORT MYERS LINE. ABOUT THE ONLY AREA THAT THE THUNDERSTORMS WERE NOT AFFECTING WAS THE LOWER SOUTHEAST COAST OF DADE COUNTY WHERE ONLY LIGHT RAIN WAS OCCURRING. RESIDENTS AND OTHER CONCERNED INTERESTS IN THE AFFECTED AREAS SHOULD BE ALERT FOR THESE THUNDERSTORMS AS THEY WILL BE ACCOMPANIED BY FREQUENT DANGEROUS LIGHTNING STRIKES...STRONG GUSTY WINDS...AND SHARPLY REDUCE VISIBILITIES IN PERIODS OF VERY HEAVY RAIN AND CAUSE POOLING OF WATER ON LOY LYING POOR DRAINAGEROADWAYS DURING THE NEXT HOUR OR SO. ELSEWHERE SHOWERS AND THUNDERSTORMS WERE SCATTERED OVER THE LOWER FLORIDA KEYS ...AND OVER THE ATLANTIC THROUGHOUT THE NORTHERN AND WESTERN BAHAMA ISLANDS. THUNDERSTORM MOVEMENT W?AS NORTHEAST 5 MILES AN HOUR. < THE MAXIMUM PRECIPITATION TOP WAS 51 THOUSAND FEET OVER THE EVERGLADES OF WESTERN DADE COUNTY.
Special weather statement, Aug 11, 7:42 PM EDT, 24 minutes before
FLZ015>023-120035- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 740 PM EDT SAT AUG 11 1990 AT 732 PM RADAR INDICATED STRONG THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE SOUTH CENTRAL SECTIONS OF THE PENINSULA...MAINLY GLADES AND HENDRY COUNTIES. RESIDENTS OF GLADES AND HENDRY COUNTIES SHOULD BE ALERT FOR THESE THUNDERSTORMS AS THEY WILL BE ACCOMPANIED BY FREQUENT DANGEROUS LIGHTNING STRIKES...STRONG GUSTY WINDS...AND REDUCED VISIBILITIES IN PERIODS OF VERY HEAVY RAIN. ELSEWHERE OVER THE PENINSULA...PATCHES OF RAIN...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED SOUTH OF A VERO BEACH/CAPE ROMANO LINE...SOUTH TO THE KEYS AND EAST TO THE NORTHERN AND WESTERN BAHAMAS. MOVEMENT WAS EAST 10 MILES AN HOUR. THE MAXIMUM PRECIPITATION TOP WAS 48 THOUSAND FEET ALONG THE GLADES/HENDRY COUNTY LINE NEAR LABELLE
Nearby
Severe Thunderstorm Warnings in Florida, 1990Every severe thunderstorm warning in 1990
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.