Alert archive / Florida / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 9, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Apr 17, 1991, 7:25 PM EDT for Palm Beach County, Florida. It was in force for 65 min.
The area
The counties it named.
The facts
- Issued
- Apr 17, 1991, 7:25 PM EDT (23:25 UTC)
- Expired
- Apr 17, 1991, 8:30 PM EDT
- In force
- 65 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
County Palm Beach County, FL
The nearest sounding before it
Cape Canaveral, FL (KXMR), launched 12:00Z, 11.4 hours before the alert went out and 203 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
- 516 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 875 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- -12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPBI 172325 SVRPBI FLC099-180030- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING NATIONAL WEATHER SERVICE WEST PALM BEACH FL 725 PM EDT WED APR 17 1991 THE NATIONAL WEATHER SERVICE IN WEST PALM BEACH HAS ISSUED A SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING EFFECTIVE UNTIL 830 PM EDT FOR THE FOLLOWING LOCATIONS... IN SOUTHEAST FLORIDA ...PALM BEACH COUNTY AND FOR BOATERS ON THE WATERS... ...PALM BEACH INLET TO JUPITER INLET AT 7:25 PM NATIONAL WEATHER SERVICE RADAR INDICATED VERY STRONG THUNDERSTORMS WITH VERY HEAVY RAINFALL OVER CENTRAL AND SOUTHWEST PALM BEACH COUNTY. MOVEMENT OF THESE THUNDERSTORMS WERE EAST AT 10 MPH. RESIDENTS AND MARINERS IN PALM BEACH COUNTY AND ADJACENT COASTAL WATERS MAY ENCOUNTER BRIEF HEAVY DOWNPOURS...STRONG GUSTY WINDS...HAIL...AND FREQUENT DANGEROUS LIGHTNING. MARINERS SHOULD BE AWARE OF THESE STORMS AND HEAD FOR SAFE HARBOR. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SdO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. NNNN
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, Apr 17, 1:46 PM EDT, 5 hours 39 minutes before
FLZ017-011-016-012-009-171845- SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE NATIONAL WEATHER SERVICE MELBOURNE FL 145 PM EDT WED APR 17 1991 AT 135 PM SHOWERS AND THUNDERSTORMS WERE SCATTERED OVER MUCH OF EAST CENTRAL FLORIDA. THE STRONGEST STORMS WERE OVER CAPE CANAVERAL EXTENDING JUST OFFSHORE OF COCOA BEACH...NEAR DISNEY WORLD...OVER LAKE COUNTY FROM LEESBURG TO ASTOR PARK NORTH TO LAKE GEORGE...AND ON THE WESTERN FRINGES OF FLAGLER AND VOLUSIA COUNTIES. OTHER STRONG STORMS WERE OVER SOUTHERN OSCEOLA AND SOUTHERN BREVARD COUNTIES. THE STORMS WERE MOVING NORTHEAST AT 15 MPH. SOME OF THESE STORMS CAN PRODUCE VERY HEAVY DOWNPOURS...STRONG GUSTY WINDS...FREQUENT DANGEROUS LIGHTNING...AND POSSIBLE SMALL HAIL. IF THREATENING WEATHER APPROACHES GO TO A PLACE OF SAFETY. BOATERS AND OTHER MARINE INTERESTS SHOULD BE ON THE LOOKOUT FOR THESE STORMS AS THEY MOVE OFFSHORE FROM FLAGLER BEACH TO SEBASTIAN INLET AND SEEK SAFE HARBOR. OVER THE NEXT TWO HOURS THUNDERSTORMS WILL CONTINUE OVER A GOOD PORTION OF EAST CENTRAL FLORIDA AND THE COASTAL WATERS FROM FLAGLER BEACH TO SEBASTIAN INLET. R.SMITH
Special weather statement, Apr 17, 1:49 PM EDT, 5 hours 36 minutes before
FLZ006>017-020-171900- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DAYTONA BEACH FL 145 PM EDT WED APR 17 1991 ...THIS IS A SPECIAL WEATHER STATEMENT FOR FLAGLER AND VOLUSIA COUNTIES AND THEIR ADJACENT COASTAL WATERS... NUMEROUS STRONG THUNDERSTORMS CAPABLE OF PRODUCING STRONG GUSTY WINDS... ...FREQUENT DANGEROUS LIGHTNING STRIKES...POSSIBLY SMALL HAIL...AND VERY HEAVY RAINFALL CONTINUE MOVING SLOWLY EAST ACROSS NORTHEAST FLORIDA. THE THUNDERSTORMS HAD MADE THEIR WAY INTO THE WESTERN AREAS OF FLAGLER AND VOLUSIA COUNTIES AND CAN BE EXPECTED TO REMAIN STRONG AS THEY MAKE THEIR WAY TO THE COASTAL AREAS. WINDS GUSTS IN EXCESS OF 30 MILES AND HOUR ARE LIKELY TO ACCOMPANY THESE THUNDERTORMS AS WELL AS NUMEROUS LIGHTNING STRIKES. RESIDENTS AND MARINERS ARE ADVISED TO BE PREPARED FOR THE APPROACH OF THESE THUNDERSTORMS AND BE PREPARED TO SEEK SAFE SHELTER IMMEDIATELY...KEEPING IN MIND LIGHTNING SAFETY TIPS. RADAR INDICATED NUMEROUS THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDING FROM SOUTHEAST GEORGIA DOWN THE ST JOHNS RIVER TO AROUND DELAND. THE THUNDERSTORMS THEN BECAME WIDELY SCATTERD FROM AROUND ORLANDO SOUTHWARD TO THE PEACE RIVER. A SOLID AREA OF THUNDERSTORMS WAS ALSO ALONG THE EAST CENTRAL FLORIDA COAST FROM TITUSVILLE TO VERO BEACH. THUNDERSTORM MOVEMENT WAS EAST AT 10 TO 15 MPH.
Special weather statement, Apr 17, 2:12 PM EDT, 5 hours 13 minutes before
FLZ017-011-016-012-009-171915- SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE NATIONAL WEATHER SERVICE MELBOURNE FL 211 PM EDT WED APR 17 1991 AT 210 PM A STRONG THUNDERSTORM WAS OVER ORANGE COUNTY JUST SOUTHWEST OF ORLANDO INTERNATIONAL AIRPORT. ONE HALF INCH HAIL HAS BEEN REPORTED SOUTH OF THE METROPOLITAN ORLANDO AREA WITH THIS STORM. THE STORM WAS MOVING NORTHEAST AT 15 MPH AND WILL MOVE THROUGH THE ORLANDO AREA WITHIN THE NEXT HOUR. ST2RONG WIND GUSTS...LARGE HAIL...AND FREQUENT DANGEROUS LIGHTNING CAN BE EXPECTED WITH THIS STORM. PERSONS IN ORANGE COUNTY FROM JUST EAST OF DISNEY THROUGH THE ORLANDO AREA SHOULD TAKE SAFE SHELTER AS THIS STORM MOVES THROUGH. R.SMITH
Special weather statement, Apr 17, 2:52 PM EDT, 4 hours 33 minutes before
FLZ017-011-016-012-009-172000- SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE NATIONAL WEATHER SERVICE MELBOURNE FL 251 PM EDT WED APR 17 1991 AT 240 PM SHOWERS AND THUNDERSTORMS CONTINUED OVER PARTS OF EAST CENTRAL FLORIDA. THE STRONGEST STORMS WERE OVER ORANGE COUNTY FROM NEA TO WINTER GARDEN EAST TO METROPOLITAN ORLANDO...OVER INDIAN RIVER COUNTY WEST OF FELLSMERE...AND OFFSHORE OUT 10 MILES FROM COCOA BEACH. WATER SPOUTS HAVE BEEN REPORTRD WITH THE STORM OFFSHORE OF COCOA...AND ONE HALF INCH HAIL WAS REPORTED SOUTH OF ORLANDO. WINDS ALSO GUSTED TO 53 MPH AT 222 PM AT THE ORLANDO INTERNATIONAL AIRPORT. OTHER STORMS WERE EXTENDED FROM BITHLO TO TITUSVILLE AND ANOTHER WAS NEAR MASCOTTE. STORMS WERE ALSO OVER WESTERN VOLUSIA AND MUCH OF FLAGLER COUNTY. THE STORMS WERE MOVING NORTHEAST AT 15 MPH. VERY HEAVY DOWNPOURS...STRONG GUSTY WINDS...HAIL...AND FREQUENT DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE STORMS. PERSONS SHOULD BE READY TO TAKE SAFE SHELTER IF THREATENING WEATHER APPROACHES. OVER THE NEXT TWO HOURS THUNDERSTORMS WILL CONTINUE OVER PARTS OF EAST CENTRAL FLORIDA...WITH THE STRONGEST ACTIVITY MOVING THROUGH ORANGE COUNTY... SOUTHERN BREVARD COUNTY...OFFSHpORE OF COCOA BEACH AND NEAR FLAGLER BEACH.. R.SMITH
Special weather statement, Apr 17, 3:46 PM EDT, 3 hours 39 minutes before
FLZ017-011-016-012-009-172045- SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE NATIONAL WEATHER SERVICE MELBOURNE FL 345 PM EDT WED APR 17 1991 ...SEVERE THUNDERSTORM WARNING FOR NORTHERN BREVARD COUNTY UNTIL 415 AND A SPECIAL MARINE WARNING FROM CAPE CANAVERAL TO VERO BEACH UNTIL 500 PM... AT 240 PM SEVERE THUNDERSTORMS WERE MOVING OVER NORTHERN BREVARD COUNTY TOWARD CAPE CANAVERAL AND COCOA. OTHER STRONG THUNDERSTORMS WERE OVER WESTERN INDIAN RIVER COUNTY...AND ANOTHER AREA EXTENDED FROM NEAR APOPKA TO DISNEY TO LAKELAND. A STRONG THUNDERSTORM WAS ALSO 10 MILES OFFSHORE COCOA BEACH AND ANOTHER OFFSHORE FROM SEBASTIAN. PERSONS SHOULD BE PREPARED TO SEEK SAFE SHELTER SHOULD THREATENING WEATHER APPROACH. ANY OF THESE STORMS CAN PRODUCE VERY HEAVY DOWNPOURS...STRONG GUSTY WINDS...HAIL...AND FREQUENT DANGEROUS LIGHTNING. BOATERS SHOULD BE AWARE OF THESE STORMS AND HEAD FOR SAFE HARBOR IF POSSIBLE. R.SMITH
Special weather statement, Apr 17, 4:45 PM EDT, 2 hours 40 minutes before
FLZ017-011-016-012-009-172145- SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE NATIONAL WEATHER SERVICE MELBOURNE FL 444 PM EDT WED APR 17 1991 ...SPECIAL MARINE WARNING FROM CAPE CANAVERAL TO VERO BEACH UNTIL 5PM... AT 430 PM STRONG THUNDERSTORMS WERE SCATTERED OVER EAST CENTRAL FLORIDA FROM COCOA TO CAPE CANAVERAL EXTENDING OFFSHORE 30 TO 50 MILES FROM THE CAPE TO ST AUGUSTINE. OTHER STORMS WERE FROM SANFORD TO ORLANDO AND KISSIMMEE SOUTHWEST TO LAKELAND. ANOTHER STORM WAS NEAR FELLSMERE IN INDIAN RIVER COUNTY. THE STORMS WERE MOVING NORTHEAST AT 15 MPH. SOME OF THESE STORMS CAN PRODUCE VERY HEAVY DOWNPOURS...STRONG WINDS...SMALL HAIL AND DANGEROUS LIGHTNING. DURING THE NEXT TWO HOURS THE STORMS WILL CONTINUE TO MOVE NORTHEAST AND BE FROM ST CLOUD TO BITHLO TO CAPE CANAVERAL. ANOTHER STORM WILL MOVE ACROSS INDIAN RIVER COUNTY TOWARD SEBASTIAN. STORMS WILL ALSO CONTINUE OFFSHORE FROM THE CAPE NORTH TO ST AUGUSTINE OUT 30 TO 50 MILES. BOATERS SHOULD SEEK SAFE HARBOR AS THESE STORMS MOVE OVER THE COASTAL WATERS FROM NORTH OF COCOA BEACH TO WELL OFFSHORE ST AUGUSTINE. R.SMITH
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 3:17 PM EDT | Severe Thunderstorm Warning | MLB | Brevard | 58 min |
| Apr 17, 5:26 PM EDT | Severe Thunderstorm Warning | MLB | Martin, Saint Lucie | 2 hr |
Nearby
Severe Thunderstorm Warnings in Florida, 1991Every severe thunderstorm warning in 1991
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.