Sea breeze driven showers and thunderstorms were prevalent throughout the afternoon and evening hours. One of these storms along a colliding boundary was able to produce a funnel cloud in Miami Dade County.
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The episode as NWS MFL wrote it up.
Sea breeze driven showers and thunderstorms were prevalent throughout the afternoon and evening hours. One of these storms along a colliding boundary was able to produce a funnel cloud in Miami Dade 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 19, 3:36 PM EST, 1 hour 14 minutes earlier.
Area Forecast Discussion
National Weather Service Miami FL
436 PM EDT Tue Sep 19 2017
.DISCUSSION...
Latest visible satellite imagery shows scattered
diurnally driven fair weather cu dominating over most of the
peninsula. Enhanced lift along a weak boundary over Palm Beach
County was creating towering cu and a few showers in the northeast
portion of the CWA. An isolated thunderstorm will be possible
through this evening, but with 500 mb warmer than -6.0 C, not
anticipating any strong convection. Otherwise, rather benign
weather continues across south Florida. Maximum temperatures are
topping off in the upper 80s along the east coast metro region and
lower 90s for the interior. Relatively dry air continues to
advect in behind Hurricane Jose and will do so through the night.
Short range models, including the HRRR and WRF, show shower
activity diminishing overnight, with the loss of diurnal heating.
Wednesday through Sunday: As Hurricane Jose weakens over the next
several days, there will be less of an influence on our area. Mid
range models prog a large high pressure ridge to build over the
eastern CONUS in its wake. Thus, surface high pressure to the
north will maintain easterly flow over the Florida peninsula.
Various surges of moisture from the over Atlantic will help to
generate isolated showers and thunderstorms. Coverage will be
greatest for interior during the afternoons, then transition to
the east coast metro at night. Maximum temperatures will be
around average for this time of year with upper 80s along the
coast and around 90 inland. Through the period, Hurricane Maria is
forecast to move northwest from Puerto Rico, then north of the
Turks and Caicos. Thus, no direct impacts from the Hurricane are
anticipated for our region.
While the track of Maria is expected to remain to our east, continue
to keep a close eye on the forecast over the next several days. In
the meantime, it is always a good idea to review hurricane plans and
to restock any items used during Hurricane Irma as we continue to
remain in the middle of hurricane season.
&&
.MARINE...
Long period swell from distant Hurricane Jose will
keep cautionary conditions over the waters off Palm Beach County
into midweek. Conditions will briefly improve late week as Jose
moves farther from the area and high pressure builds back into
the region with increasing east-northeast flow.
.GULF STREAM HAZARDS...Long period northeasterly swell will bring
seas up to 6 feet off Palm Beach County.
&&
.AVIATION...
Latest radar imagery shows some isolated convection starting
to initiate over the interior near the Lake region and portion
of the northeastern coast. Expect a few isolated showers to
be near or move over the terminal as the afternoon progresses.
Highest chance remains north from FLL into PBI at this time. Can
not ruled out some SHRA near MIA or TMB but possibly later in the
afternoon. Winds will remain light no more than 10 knots. Most of
the convection will move inland into the late afternoon west of
most of the east and west coast terminals. VFR with light winds
prevail overnight into Wednesday.
&&
.BEACH FORECAST...
Long period northeasterly swell from the distant Hurricane Jose
will continue to filter through the local Atlantic waters. A high
risk of rip currents will continue for all the Atlantic beaches
this evening, and likely remain moderate to high into late week.
&&
.PRELIMINARY POINT TEMPS/POPS...
West Palm Beach 76 90 76 89 / 40 30 20 30
Fort Lauderdale 78 91 78 90 / 30 20 20 30
Miami 77 91 77 91 / 20 20 20 30
Naples 75 91 75 91 / 20 30 20 40
&&
.MFL WATCHES/WARNINGS/ADVISORIES...
FL...High Rip Current Risk through Wednesday evening for FLZ168-172-
173.
AM...None.
GM...None.
&&
DISCUSSION...27/JT
MARINE...27/JT
AVIATION...67/MT
BEACH FORECAST...27/JTHazardous Weather Outlook for South Florida National Weather Service Miami FL 1030 AM EDT Tue Sep 19 2017 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 200230- 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- 1030 AM EDT Tue Sep 19 2017 ...HIGH RISK OF RIP CURRENTS ALONG THE EAST COAST BEACHES... ...A FEW AFTERNOON THUNDERSTORMS ACROSS THE REGION TODAY... ...SEAS 6 TO 7 FEET OFF THE COASTAL WATERS OF PALM BEACH COUNTY... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Rip currents: There is a high risk of rip currents along all Atlantic beaches. Thunderstorms: Isolated thunderstorms will be possible across much of South Florida this afternoon. The main threat will be occasional lightning strikes. Waves: Occasional seas of 6 to 7 feet in a long period swell are possible off the coast of Palm Beach County through tonight. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Scattered afternoon showers and thunderstorms are expected to return to South Florida each afternoon through the end of the week. The main threats will be frequent lightning strikes and locally heavy rainfall. Long period swell from distant Hurricane Jose will continue to lead to a moderate to high risk of rip currents along all Atlantic beaches into late week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. For more information...visit the National Weather Service in Miami website at www.weather.gov/miami.
The Miami radar (KAMX), 33 km away, was scanning. The volume nearest the first event began at 21:52 UTC.
1 funnel cloud. Local standard time, as filed.
Multiple reports from the public and photos on social media reported a funnel cloud in northern Miami-Dade County west of US-27.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2017Every state in 2017This day in weather historyWarnings in Florida, September 2017
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: 721513.