Deep and moist southerly wind flow led to an active afternoon of thunderstorms across parts of southeast Florida.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MFL wrote it up.
Deep and moist southerly wind flow led to an active afternoon of thunderstorms across parts of southeast Florida.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Miami, FL wrote its last area forecast discussion before the first event at Sep 11, 12:56 PM EST, 34 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MIAMI FL 156 PM EDT FRI SEP 11 2015 .AVIATION... CONVECTIVE CELLS CURRENTLY DEVELOPING ALONG THE SEA BREEZE BOUNDARIES WITH THE STEERING FLOW VERY WEAK. MOVEMENT WILL BE RATHER CHAOTIC SO THERE IS A SLIM CHANCE ONE CELL COULD MOVE ACROSS A TERMINAL ALONG THE EAST COAST BUT WILL BE VERY BRIEF IF IT DOES OCCUR. SURFACE WIND WILL BE L/V AFT 00Z WITH A STRONGER SOUTH-SOUTHWEST FLOW EARLY SATURDAY DUE TO A COLD FRONT MOVING INTO NORTH FLORIDA. KOB && .PREV DISCUSSION... /ISSUED 1053 AM EDT FRI SEP 11 2015/ UPDATE... A LITTLE PERPLEXED THIS MORNING ON HOW TO HANDLE THE MORNING UPDATES. DO NOT PLAN ON CHANGING MUCH, HOWEVER THE 12Z MFL SOUNDING HAS ME WONDERING. THE 06Z RUN OF THE GFS INITIALIZED ON MORE OF A SOUTHERLY FLOW AND HAD THAT MAINTAINED THROUGH 12Z. THE SOUNDING SHOWS THAT THE STEERING FLOW IS MORE SOUTH-SOUTHWEST ALTHOUGH VERY WEAK AT AROUND 5 MPH. THE MID LEVEL LAPSE RATES ARE A LITTLE MORE IMPRESSIVE THAN THE PAST FEW DAYS, HOWEVER THE 500MB TEMPERATURE REMAINS AT -5.5C WHICH IS STILL A DEGREE WARMER THAN THE AVERAGE FOR THIS DATE. THERE IS ALSO A VERY WEAK CAP AT 700MB BUT SOME TIMES FOR SOUTH FLORIDA THAT SIGNIFICANTLY HINDERS UPDRAFT DEVELOPMENT. SO ALL THINGS CONSIDERED, WILL ADD A FLOODING STATEMENT TO THE HWO ALONG WITH POSSIBLE STRONG WIND GUSTS AND THIS COULD ALSO AFFECT THE INLAND AREAS ALONG THE EAST COAST METRO AREA JUST DUE TO THE FACT THAT IF THE A MORE ROBUST UPDRAFT CAN OVERCOME THE CAP, THERE IS THE POTENTIAL FOR A STRONGER STORM. ALSO, THE NCAPE IS AT .23 WHICH INDICATES MORE SUSTAINABLE STORM STRENGTH VERSUS PULSE TYPE AND WHEN THE SOUNDING IS MODIFIED FOR DIURNAL HEATING THIS AFTERNOON IT JUMPS TO .35 AND THIS INDICATES THE POTENTIAL FOR SUSTAINABLE STORM STRENGHT VERSUS PULSE TYPE ACTIVITY OVER THE PAST FEW DAYS. SO THAT ALONG WITH PWAT AT JUST OVER 2" THERE COULD ALSO BE THE POTENTIAL FOR SOME MINOR STREET FLOODING WITH THE ANTICIPATED SLOW STORM MOTION. KOB PREV DISCUSSION... /ISSUED 736 AM EDT FRI SEP 11 2015/ AVIATION... STEERING FLOW WILL CONTINUE TO BE VERY WEAK BUT MODELS DO SUGGEST A MORE SOUTHERLY FLOW DEVELOPING BY THIS AFTERNOON. SO INITIAL DEVELOPMENT OF CONVECTION TODAY WILL AGAIN BE ALONG SEA BREEZE BOUNDARIES AND DRIFT SLOWLY INLAND WITH LATE AFTERNOON ACTIVITY BEING STEERED INLAND AND AWAY FROM THE TERMINALS. MOSTLY VFR CONDITIONS ARE THEREFORE ANTICIPATED THROUGH THE FORECAST WITH SURFACE WIND BECMG L/V AFT 00Z THIS EVENING. KOB PREV DISCUSSION... /ISSUED 300 AM EDT FRI SEP 11 2015/ SHORT TERM /TODAY THROUGH SUNDAY/... BENIGN NIGHT ACROSS SOFLA...WITH JUST A FEW SHRA OVER GULF/ATLC WATERS. GENERAL TROUGH OVER ERN CONUS EVIDENT ON IR IMAGERY...WITH AREAS OF CONVECTIVE DEBRIS OVER FL PENINSULA. TDA WILL BE BIT OF TRANSITION DAY AS SUBTROPICAL RIDGE REMAINS DOMINANT...BUT INCREASINGLY SHARP M/ULVL TROUGH OVER GREAT LAKES DIGS INTO TN VLY. STILL EXPECT TSTM INITIATION ALONG SEA BREEZES...MAINLY INTERIOR OF URBAN AREAS...AND MOST LIKELY OVER EVERGLADES THIS AFTERNOON. AS RIDGE WEAKENS...SLIGHTLY MORE COVERAGE IN ACTIVITY EXPECTED TODAY. AS WEEKEND ENSUES...DEEP TROUGH OVER TN/OH VLYS BECOMES EVEN DEEPER AND CLOSES INTO H5 LOPRES. ASSOCIATED SFD CDFNT WILL MOVE THROUGH SERN CONUS AND ENTER NRN FL SATURDAY...THEN STALL ALONG I-4 CORRIDOR ON SUNDAY. BEST LOW-LEVEL CONVERGENCE AND MOISTURE POOLING WILL BE ALONG THIS FEATURE OVER CENTRAL FLORIDA...BUT OVERALL DYNAMICAL SUPPORT FROM DEEP SWLY FLOW AHEAD OF H5 TROUGH/LOPRES COOL TEMPS ALOFT...COMBINED WITH SEA- BREEZE CONVERGENCE SHOULD ALLOW FOR NUMEROUS SHWRS/TSTMS OVER SOUTH FLORIDA BOTH AFTERNOON. ALTHOUGH CONVECTIVE DEBRIS MAY INHIBIT WIDESPREAD STRONG CONVECTION...CANT RULE OUT SOME STRONG WIND GUSTS ACROSS THE REGION DURING THE AFTERNOONS. LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... AFOREMENTIONED UPPER-LEVEL FEATURES WILL DRIFT INTO NEW ENGLAND AND GRADUALLY WEAKEN EARLY NEXT WEEK...AS SUBTROPICAL RIDGE RE- ESTABLISHES OVER FLORIDA. REMNANT SFC BOUNDARY OVER CENTRAL FLORIDA WILL REMAIN...PROVIDING FOCUS FOR AFTERNOON SHOWERS/TSTMS. EASTERLY FLOW DOMINATES...THUS ACTIVITY MONDAY WILL FOCUS OVER INTERIOR AND TOWARD WEST COAST. SUBTLE EASTERLY WAVE MAY ENHANCE MOISTURE/LIFT MID-WEEK...INCREASING RAIN CHANCES AREAWIDE. AVIATION... WINDS WILL BE LIGHT AND VARIABLE OVER TAF SITES THROUGH THE EARLY MORNING HOURS BEFORE BECOMING EASTERLY 5 TO 10 KNOTS LATE THIS MORNING INTO EARLY AFTERNOON HOURS OVER THE EAST COAST TAF SITES. KAPF TAF SITE WILL BECOME WESTERLY LATE THIS MORNING INTO THE AFTERNOON HOURS WITH WIND SPEEDS AROUND 10 KNOTS. THE WEATHER WILL ALSO REMAIN DRY THROUGH LATE THIS MORNING...BEFORE SCATTERED SHOWERS AND THUNDERSTORMS DEVELOP ALONG THE EAST BREEZES AND PUSH INLAND. THEREFORE...VCTS WILL REMAIN IN PLACE BETWEEN 16Z AND 00Z. THE CEILING AND VIS WILL ALSO REMAIN IN THE VFR CONDITIONS IN THE TAF SITES TODAY...AS THE TIMING OF THE SHOWERS AND THUNDERSTORMS IS NOT KNOWN. HOWEVER...WHEN A SHOWER OR THUNDERSTORM DOES PASS OVERHEAD THIS AFTERNOON THE VIS AND CEILING COULD FALL INTO THE MVFR OR VFR CONDITIONS. MARINE... SOUTHERLY WINDS 10 KT OR LESS WILL PREVAIL THIS WEEKEND OUTSIDE OF SCATTERED SHOWERS AND THUNDERSTORMS. NEXT WEEK...EASTERLY WIND WILL DOMINATE. SEAS GENERALLY 3 FEET OR LESS. && .MFL WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. GM...NONE. &&
HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA NATIONAL WEATHER SERVICE MIAMI FL 1113 AM EDT FRI SEP 11 2015 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 120315- LAKE OKEECHOBEE-BISCAYNE BAY- COASTAL WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL OUT 20 NM- COASTAL WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL OUT 20 NM- WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL EXTENDING FROM 20 NM TO 60 NM- WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL EXTENDING FROM 20 NM TO THE TERRITORIAL WATERS OF THE BAHAMAS-GLADES-HENDRY- INLAND PALM BEACH-METRO PALM BEACH-COASTAL COLLIER-INLAND COLLIER- INLAND BROWARD-METRO BROWARD-INLAND MIAMI DADE-METRO MIAMI DADE- MAINLAND MONROE-COASTAL PALM BEACH-COASTAL BROWARD- COASTAL MIAMI DADE-FAR SOUTH MIAMI DADE- COASTAL WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL OUT 20 NM- COASTAL WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE, FL OUT 20 NM- GULF WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL EXTENDING FROM 20 TO 60 NM- 1113 AM EDT FRI SEP 11 2015 ...SCATTERED TO NUMEROUS THUNDERSTORMS THIS AFTERNOON... ...HEAT INDEX VALUES ABOVE 105F INTERIOR... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS: NUMEROUS THUNDERSTORMS ARE EXPECTED THIS AFTERNOON OVER MAINLY INTERIOR SOUTH FLORIDA...WITH SCATTERED ACTIVITY ELSEWHERE. THE PRIMARY THREAT WITH THIS ACTIVITY IS FREQUENT CLOUD TO GROUND LIGHTNING ALONG WITH HEAVY RAINFALL AND GUSTY WINDS. WIND: THE STRONGEST STORMS WILL HAVE THE POTENTIAL TO PRODUCE WIND GUSTS TO NEAR 50 MPH. FLOODING: SLOW MOVING THUNDERSTORMS COULD HAVE THE POTENTIAL TO PRODUCE HEAVY RAINFALL WHICH COULD LEAD TO MINOR URBAN TYPE STREET FLOODING, ESPECIALLY OVER THE WESTERN SUBURBS OF THE EAST COAST METRO AREA. TEMPERATURES: HEAT INDICES OVER MUCH OF SOUTH FLORIDA WILL APPROACH 105 DEGREES TODAY. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH AFTERNOON...WITH ACTIVITY MOST NUMEROUS OVER INTERIOR SOUTH FLORIDA. THE PRIMARY THREAT WITH THIS ACTIVITY WILL BE FREQUENT CLOUD TO GROUND LIGHTNING. GUSTY WINDS ARE POSSIBLE IN THE STRONGEST THUNDERSTORMS...PARTICULARLY THIS WEEKEND. .SPOTTER INFORMATION STATEMENT... WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTERS ARE ENCOURAGED TO REPORT HIGH WIND AND FLOODING TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI. FOR MORE INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN MIAMI WEBSITE AT WWW.WEATHER.GOV/MIAMI.
The Melbourne radar (KMLB), 140 km away, was scanning. The volume nearest the first event began at 18:30 UTC.
1 lightning. Local standard time, as filed.
Lightning struck a garage roof of a home in Jupiter Landings. Palm Beach County Fire Rescue and Florida Power & Light officials responded and found a damaged rafter under the shingles, a charred electrical line and blown circuit.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2015Every state in 2015This day in weather historyWarnings in Florida, September 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 601206.