A sea breeze weather pattern across South Florida, where showers and thunderstorms developed along sea breeze and boundary collisions. Thunderstorms developed across the western east coast metro in the afternoon where a boundary collision allowed a funnel cloud to form over western Broward 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 sea breeze weather pattern across South Florida, where showers and thunderstorms developed along sea breeze and boundary collisions. Thunderstorms developed across the western east coast metro in the afternoon where a boundary collision allowed a funnel cloud to form over western Broward 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, 12:29 PM EST, 1 hour 31 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 129 PM EDT Wed Sep 19 2018 .AVIATION... VFR conditions to prevail through the forecast period. East coast sea breeze 9-12 knots already has pushed through the SE Florida sites with isolated/scattered SHRA/TSRA mainly beyond 5 NM inland. VCSH included at east coast sites to account for this activity as most numerous TSRA over the interior peninsula through 00z. KAPF Gulf 8-10 knot seabreeze will move inland by 18z with SHRA/TSRA staying far enough inland to not mention in TAF. Dry with light wind aft 02z then NE 7-10 kts after 15z Thu. && .PREV DISCUSSION... /issued 1152 AM EDT Wed Sep 19 2018/ UPDATE... Morning sounding data and analyses of water vapor and precipitable water data show that South Florida currently sits under a pocket of relatively drier air associated with mid level ridge extending west to east across the area. To the north is an area of higher moisture over Central Florida associated with a trough just to the north, and to the south is deeper moisture over the Straits of Florida along a weak and nearly stationary low-level trough. Short-term model guidance suggests that the trough across Central/North Florida will nudge southward this afternoon, potentially leading to a slight moisture increase across South Florida as the day progresses. Overall wind flow is light across the area with weak southerly flow already overtaken by East coast sea breeze late this morning, with the Gulf sea breezes to follow shortly after Noon. Short-range/high-resolution models indicate a slightly more convectively-active East coast seabreeze this afternoon with a slow N-NE storm motion. Current depiction of PoPs for this afternoon generally follow this pattern of highest rain chances from Palm Beach County south into interior Broward and Miami-Dade counties and will not make changes at this time. Last few hourly runs of the HRRR model suggest a higher chance of precip over parts of the MIA/FLL area compared to forecast PoPs, so will monitor these trends closely. Hi-res guidance conversely shows little in the way of precip around and west of Lake Okeechobee as well as over interior Collier County where forecast PoPs are in the 30-40% range this afternoon. Will not make any changes in these areas despite this guidance, as general pattern supports at least a few showers/thunderstorms developing along the advancing Gulf sea breeze. Low PoPs along the Gulf coast is generally supported by model guidance and trends. Weak mid-level lapse rates and lack of strong forcing suggests that storms today will be primarily below advisory levels. Temperatures and wind also look on track for this afternoon. PREV DISCUSSION... /issued 746 AM EDT Wed Sep 19 2018/ AVIATION... With more of a southeast flow today, both the Gulf and Atlantic sea breezes should be able to form today. This should push most of whatever convective activity forms, to the interior. This should limit the impact at the TAF sites. Current Hi-res models are showing limited activity today as well, so have removed TS from the TAFs and left VCSH for now. Otherwise, VFR conditions should prevail through the day. PREV DISCUSSION... /issued 300 AM EDT Wed Sep 19 2018/ DISCUSSION... TODAY AND TONIGHT... Mid to upper ridging will remain prominent from the eastern Gulf of Mexico into the western Atlantic, as upstream troughing dips into northern Florida and offshore of the Carolinas. At the surface, a somewhat diffuse frontal zone will meander about the lower gulf coast states as western Atlantic ridging continues to dominate our weather locally. Moisture channel imagery, streamline analysis, and the GOES total precipitable water product all indicate that drier air is filtering into southeast Florida, while deeper moisture pools to our north ahead of the aforementioned frontal zone. The combination of warm temperatures aloft and subsidence from the deep layer ridge suggests a general suppression of shower and thunderstorm coverage for today, and this is consistent with output from the convection allowing mesoscale models, which show only scattered sea breeze driven convection over mainly interior and west coast areas for this afternoon. Expect showers and storms to end this evening over land areas, while perhaps lingering a bit longer over the Gulf waters. High temperatures have been running a bit over the blended model guidance, particularly across interior and western portions of the area, and will go with a persistence forecast for temperatures, with maximums in the lower to mid 90s for the west, and upper 80s to lower 90s elsewhere. THURSDAY AND FRIDAY... Ridging aloft will begin to break down on Thursday, as offshore troughing evolves into a closed low over the Bahamas Thursday night. The low will slowly trek westward across South Florida on Friday, bringing an increase in moisture and upper level winds. This, combined with cooling 500 mb temperatures to around -10 Celsius, suggests more widespread showers and thunderstorms on Friday, with a few stronger storms possible. Temperatures should be near, to perhaps slightly below, normal with more cloud cover and greater thunderstorm coverage on Friday. SATURDAY THROUGH TUESDAY... The upper low will be off to our west by Saturday afternoon, however a few residual perturbations will pass through, and deep moisture should remain in place through at least Sunday. Drier air will filter in thereafter, with lesser shower and thunderstorm coverage expected by early next week. Look for Temperatures to remain near seasonal normals. MARINE... Prevailing east to southeast winds will continue for the Atlantic and Gulf waters, with wave heights averaging 3 feet or less. Scattered showers and thunderstorms will occur across the Atlantic and Gulf waters mainly during the overnight and early morning hours, before shifting primarily to the Gulf waters during the afternoon. Winds and waves could be locally higher in and around any shower or thunderstorm. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 77 89 77 88 / 20 20 30 50 Fort Lauderdale 79 90 79 88 / 20 20 30 50 Miami 78 90 78 87 / 20 30 30 50 Naples 77 93 75 90 / 20 50 30 60 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && AVIATION...59/Molleda
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 1024 AM EDT Wed Sep 19 2018 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- 1024 AM EDT Wed Sep 19 2018 ...SCATTERED AFTERNOON STORMS OVER THE INTERIOR AND GULF COAST... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Thunderstorms: Thunderstorms are possible today over much of South Florida, with the best chances over the interior. The primary threats are lightning. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Scattered mainly afternoon thunderstorms are forecast each day, especially over the western interior. The primary threats are lightning, heavy rain, and gusty winds. .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), 59 km away, was scanning. The volume nearest the first event began at 18:57 UTC.
1 funnel cloud. Local standard time, as filed.
Multiple members of the broadcast media reported a funnel cloud near Markham Park area around 3PM EDT associated with an area of showers and thunderstorms.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2018Every state in 2018This day in weather historyWarnings in Florida, September 2018
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: 786820.