A frontal boundary and plenty of tropical moisture provided enough instabillity to produce strong thunderstorms in the afternoon. Some of these storms produced hail in Broward and Palm Beach Counties and a funnel cloud in Collier County.
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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.
A frontal boundary and plenty of tropical moisture provided enough instabillity to produce strong thunderstorms in the afternoon. Some of these storms produced hail in Broward and Palm Beach Counties and a funnel cloud in Collier County.
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 30, 12:54 PM EST, 9 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 154 PM EDT Fri Sep 30 2016 .AVIATION... Both the Gulf Coast and east coast sea breeze have developed and will continue to push inland over the next couple of hours. Showers and thunderstorms may periodically affect all TAF sites through 01/0200Z. Some of these storms could become strong, capable of producing gusty/erratic winds over 30KT, as well as low vis in RA+. Activity will wane overnight, with VFR conds expected to return. && .PREV DISCUSSION... /issued 1026 AM EDT Fri Sep 30 2016/ UPDATE... Water Vapor imagery this morning continued to show a stagnant deep low pressure system cyclonically spinning near the Ohio Valley. A diffuse front ahead of this system was observed sagging southward over the southeast Atlantic coastline, down through central Florida. This feature will help to increase moisture and destabilize the atmosphere over our region, enhancing thunderstorm development this afternoon. The 12Z MFL sounding showed 3400 J/KG, which is plenty of available energy for strong updrafts. The 500 mb temp was -8.9 C, a near record low value for this time of year. PW has also increased from 24-hours ago, rising to 1.96 inches. These factors, along with plenty of diurnal heating, will lead to scattered to numerous thunderstorms early this afternoon across the interior, with more isolated activity along the coasts. Some of these storms could be strong with gusty erratic winds 45-55 mph, small hail, and contain heavy downpours. Due to deep southwest flow, the activity today should generally move to the east. After the loss of a daytime heating, small scale models, such as the HRR and HiResWRF, show convection diminishing over land. Have increased coverage of likely pops over the interior through this evening, otherwise the forecast appeared on track. PREV DISCUSSION... /issued 348 AM EDT Fri Sep 30 2016/ DISCUSSION... SYNOPSIS... An upper-level low over the Ohio River Valley and frontal boundary over northern Florida will continue to promote scattered showers and thunderstorms through the weekend as plenty of tropical moisture remains in place across the region. NEAR TERM /THROUGH 6 PM FRIDAY EVENING/... As of 345 AM EDT...Mainly dry weather has been ongoing across much of South Florida early this morning, outside of some widely scattered showers and thunderstorms over the Gulf waters. This trend is expected to continue through daybreak, with another round of scattered showers and thunderstorms expected later today, with much of the morning continuing to remain dry for most. The flow will continue to be out of the south/southwest, which will help to limit the inland extent of the Atlantic sea breeze and favor a stronger Gulf breeze. By the late morning/early afternoon hours, scattered showers and thunderstorms should develop along the leading edge of the Gulf sea breeze, progressing inland into the afternoon hours. Some storms will also be possible in the east coast metro area as well as the Atlantic sea breeze struggles to push inland. The observed 00z KMFL sounding indicated a 500 hPa temp of -9.4 C, which is near the coldest observed temps at this level for this time of year. Forecast model soundings for this afternoon and evening continue to show 500 hPa temps hovering around -9 C, which would likely yield midlevel lapse rates around -7 C. Therefore, a few strong to perhaps severe storms with gusty winds and small hail will certainly be a possibility today and will highlight this threat in the Hazardous Weather Outlook. With plenty of tropical moisture in place and relatively slow storm motion, locally heavy rainfall will also be a concern, with localized poor drainage flooding possible in urbanized and low lying areas. High temperatures will generally be in the upper 80s across the region today, with a few lower 90s readings possible in the interior. SHORT TERM /6 PM FRIDAY EVENING THROUGH SUNDAY NIGHT/... The upper-level low over the Ohio River valley and lingering frontal boundary across northern Florida will continue to promote an unsettled weather pattern through the weekend across the region. Deep tropical moisture will continue to remain in place and continue to advect into the region ahead of Hurricane Matthew, likely remaining at or above 2.0 inches through the period, above normal for this time of year. Coupled with mesoscale effects like sea breeze and outflow convergence, scattered to locally numerous thunderstorms are expected especially during the afternoon and evening hours. During the night, convection is expected to decrease over land and remain focused over the local waters, with a few showers and storms occasionally impacting portions of the east coast metro area. With the flow gradually transitioning to more of an easterly direction, the greatest coverage should be across the interior and Gulf Coast, although the east coast metro area will see chances for storms during the late morning and early afternoon hours as well. Forecast 500 hPa temps in the -7 to -9 C range could also lead to some locally strong storms during the short term period as well. High temperatures will generally be in the 80s with low temperatures in the 70s. LONG TERM /MONDAY THROUGH THURSDAY/... The long term period continues to remain highly uncertain and dependent upon the evolution, strength, and track of Hurricane Matthew. While there continues to remain significant uncertainty on potential impacts for land areas, confidence continues to increase that marine conditions will deteriorate and become hazardous early next week, possibly continuing through most of the week. Regardless, scattered showers and thunderstorms will certainly be possible through the long term period, with the eventual track of Matthew ultimately determining the areal coverage of convective activity. It will likely be breezy at times as well during the long term period, especially along the east coast. High temperatures will generally be in the mid to upper 80s with low temperatures in the 70s. While there remains a great deal of uncertainty on potential impacts of Hurricane Matthew for South Florida, now is the time to review hurricane preparedness plans and to make sure your hurricane supplies are fully stocked. Interests in South Florida should continue to remain well informed on the forecast regarding Hurricane Matthew with the latest information from the National Hurricane Center and National Weather Service Miami. MARINE... Scattered showers and thunderstorms will be possible through the weekend, especially over the local Atlantic waters as the flow gradually shifts to an easterly direction. As Hurricane Matthew tracks closer to the region early next week, hazardous marine conditions will be possible, with conditions expected to deteriorate early next week and continuing through much of the week. Hazardous seas and gusty winds will be possible, with the magnitude ultimately dependent on the evolution, strength, and track of Matthew. Marine interests should continue to remain well informed on the latest forecasts from the National Hurricane Center and National Weather Service Miami. BEACH FORECAST... Rip current risk is expected to remain low today for all South Florida beaches. Rip current risk along Atlantic beaches may increase late this weekend as Hurricane Matthew moves closer to the region. Increased rip current risk will likely continue through much of next week for Atlantic beaches along with other possible hazardous conditions such as significant waves and beach erosion. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 77 89 78 89 / 40 50 30 50 Fort Lauderdale 78 89 78 88 / 40 50 40 50 Miami 77 90 78 90 / 30 50 30 50 Naples 75 91 75 90 / 30 60 30 60 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && DISCUSSION...92/IRL MARINE...92/IRL AVIATION...27/JT UPDATE...27/JT
HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA NATIONAL WEATHER SERVICE MIAMI FL 429 AM EDT FRI SEP 30 2016 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 302100- 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 FROM 20 TO 60 NM- WATERS FROM DEERFIELD BEACH TO OCEAN REEF FL FROM 20 TO 60 NM EXCLUDING THE TERRITORIAL WATERS OF 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- WATERS FROM CHOKOLOSKEE TO BONITA BEACH FL FROM 20 TO 60 NM- 429 AM EDT FRI SEP 30 2016 ...NUMEROUS SHOWERS AND THUNDERSTORMS THIS AFTERNOON.. ...A FEW STRONG THUNDERSTORMS POSSIBLE... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS: ISOLATED THUNDERSTORMS OVER THE LOCAL GULF WATERS MAY BRUSH PORTIONS OF THE COLLIER AND MAINLAND MONROE COUNTIES COASTS THROUGH THE MORNING HOURS. SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED TO DEVELOP LATE THIS MORNING AND THROUGH THE AFTERNOON HOURS. THE PRIMARY THREATS WILL BE FREQUENT LIGHTNING, HAIL, GUSTY WINDS, AND LOCALIZED URBAN FLOODING. HAIL: SMALL HAIL IS POSSIBLE TODAY WITH THE STRONGEST STORMS. WINDS: GUSTY WINDS OF 40 TO 50 MPH WILL BE POSSIBLE WITH MANY STORMS TODAY. WIND GUSTS IN EXCESS OF 60 MPH WILL BE POSSIBLE WITH THE STRONGEST STORMS. FLOODING: URBAN FLOODING IS POSSIBLE OVER ALL OF THE METRO AREAS OF SOUTH FLORIDA, ESPECIALLY IN LOW LYING AND POOR DRAINAGE AREAS. WATERSPOUTS: WATERSPOUTS ARE POSSIBLE OVER ALL SOUTH FLORIDA WATERS TODAY. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE RISK OF RIP CURRENTS ALONG THE ATLANTIC COAST MAY INCREASE LATE THIS WEEKEND AS ONSHORE FLOW INCREASES. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY, ESPECIALLY DURING THE AFTERNOONS AND EVENINGS. THE NATIONAL HURRICANE CENTER CONTINUES TO MONITOR THE PROGRESS OF HURRICANE MATTHEW, CURRENTLY MOVING THROUGH THE CARIBBEAN. WHILE THERE REMAINS A GREAT DEAL OF UNCERTAINTY ON POTENTIAL IMPACTS OF HURRICANE MATTHEW FOR SOUTH FLORIDA, ESPECIALLY TO THE MAINLAND, MARINE CONDITIONS FOR THE ATLANTIC WATERS ARE EXPECTED TO DETERIORATE EARLY NEXT WEEK. HAZARDOUS CONDITIONS MAY LINGER THROUGH MUCH OF THE WEEK. THE ADVERSE MARINE CONDITIONS MAY ALSO BRING THE CONCERN FOR BEACH EROSION AND COASTAL FLOODING. THESE CONDITIONS WILL GREATLY DEPEND ON THE TRACK, STRENGTH, AND TIMING OF THE SYSTEM. NOW IS THE TIME TO REVIEW HURRICANE PREPAREDNESS PLANS AND TO MAKE SURE YOUR HURRICANE SUPPLIES ARE FULLY STOCKED. INTERESTS IN SOUTH FLORIDA SHOULD CONTINUE TO REMAIN WELL INFORMED ON THE FORECAST REGARDING HURRICANE MATTHEW WITH THE LATEST INFORMATION FROM THE NATIONAL HURRICANE CENTER AND NATIONAL WEATHER SERVICE MIAMI. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION: WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTERS ARE ENCOURAGED TO REPORT HIGH WIND 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 Miami radar (KAMX), 42 km away, was scanning. The volume nearest the first event began at 18:05 UTC.
2 hail, 1 funnel cloud. Local standard time, as filed.
A member of the media reported quarter size hail on I-75 in Miramar. There were also multiple reports of pea size hail in surrounding areas.
Naples Airport observer reported a funnel cloud 4-5 miles northeast of the airport. The funnel cloud lasted from 213 PM EDT until 221 PM EDT and never touched the ground.
A trained spotter called to report nickel size hail falling in Jupiter Farms.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2016Every state in 2016This day in weather historyWarnings in Florida, September 2016
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: 655783, 655785, 655784.