Showers and storms that developed along the seabreezes during the late morning hours across South Florida brought numerous boundary collisions into the early afternoon. One of these collisions lead to the development of a funnel cloud over southwestern Miami-Dade County.
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The episode as NWS MFL wrote it up.
Showers and storms that developed along the seabreezes during the late morning hours across South Florida brought numerous boundary collisions into the early afternoon. One of these collisions lead to the development of a funnel cloud over southwestern 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 Apr 4, 8:57 AM EST, 3 hours 23 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 957 AM EDT Wed Apr 4 2018 .UPDATE... Generally quiet conditions expected today. Atlantic sea breeze already appears to be developing along the coast, and as it moves inland, isolated showers are possible along the boundary. Otherwise, mainly dry conditions with south and southwest wind and mostly sunny skies are expected. && .PREV DISCUSSION... /issued 819 AM EDT Wed Apr 4 2018/ AVIATION... SE wind in take hold at speeds of around 10 KT by late this morning and early afternoon, then diminish to nearly calm after sunset as a weak cold front sags into the region. Aside from a few periods of low CIGs this morning on the east coast, conditions should remain VFR. A few showers are possible this afternoon on the east coast, mainly over Miami-Dade County where VCSH remains in grids. PREV DISCUSSION... /issued 318 AM EDT Wed Apr 4 2018/ DISCUSSION... High pressure is forecast to weaken as a cold front approaches South Florida. The front is associated with a low pressure system that is forecast to move from the Great Lakes region this morning, to the northeast, remaining north of New England. This will allow for the wind to turn from southeast this morning to a more south to southwest direction this afternoon, with speeds of 5 to 10 miles per hour. The sea breeze is forecast to develop along both coasts, but the Gulf coast sea breeze should be the more dominate, allowing for the possibility of showers in the eastern half of South Florida this afternoon. There may even be enough instability this evening for a thunderstorm off the Palm Beach County coast. The front will move through the area by Thursday morning, turning the wind to the north at 8 to 12 miles per hour. The front is forecast to stall in the northern Florida Straits and then dissipate. This will allow for showers, and perhaps a few thunderstorms, for the region Thursday afternoon. High pressure then sets up again for the weekend, with an easterly wind developing by Friday, and turning more southeast to south by Saturday. Another frontal system attempts to move through the area over for Sunday, but only the tail end of the frontal boundary looks to have a chance to affect the region. This boundary keeps some instability in the region for a chance showers, and a slight chance for thunderstorms on Sunday. By Monday, yet another system move close enough to possibly affect our weather in South Florida. Models are in better agreement with this system, although not great agreement. Both the GFS and the ECMWF have a 500mb trough over the Great Lakes region. The big difference is a low pressure system that the GFS wants to develop over the North Carolina coast by 00z Tuesday. The ECMWF is slower to develop the low, and has it over Central Florida at 00z Tuesday. The GFS deepens the low fairly quickly, and moves it to the northeast, sitting off the New England coast by 18z Tuesday. It has a cold front extending southwest, over Central Florida, and into the Gulf of Mexico. It has high pressure pushing the front completely through South Florida by 12z Wednesday. This may bring showers and thunderstorms to South Florida as it traverses the area. The ECMWF has the low much further to the south and less of a cold front associate with it. Even so, it also has the front moving through South Florida by 12z Wednesday, bringing the possibility of showers and thunderstorms as it does. Given both scenarios end up having similar effects on South Florida, have a chance of showers and slight chance of thunderstorms for the region for Tuesday through Wednesday morning. With the active weather, and even with fronts making there way across the area, models are indicating a warm up through the beginning of next week, with high temperatures in the 80s through the weekend, and possibly into the 90s for portions of the interior for Monday. Low temperatures are looking to be fairly similar each night, with the interior and Gulf coast dipping into the 60s, and the Atlantic metro area remaining in the 70s for lows. MARINE... An active weather pattern calls for periodic showers and possibly a few thunderstorms for the South Florida waters, especially for the Atlantic. A series of cold fronts will move into the area through the middle of next week. Even so, seas are forecast to run 1 to 3 feet in the Atlantic and up to 2 feet in the Gulf. With a north wind over the Atlantic waters at times, seas may briefly build to 5 to 6 feet in the Gulf Stream through the beginning of next week. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 85 69 80 69 / 10 20 40 30 Fort Lauderdale 84 72 82 71 / 20 20 50 40 Miami 86 72 83 71 / 20 10 60 40 Naples 84 70 85 66 / 0 10 30 10 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && UPDATE...23/SK DISCUSSION...13 MARINE...13 AVIATION...23/SK
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 406 AM EDT Wed Apr 4 2018 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 042300- 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- 406 AM EDT Wed Apr 4 2018 ...Slight Chance of Evening Thunderstorms Atlantic Waters... ...Patchy Fog Interior and Gulf Coast Late Tonight... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Thunderstorms: There is a slight chance of thunderstorms over the Atlantic waters mainly off the Palm Beach County coast this evening. Gusty winds and locally rough seas are possible in and near any thunderstorms. Visibility: Patchy fog is expected late tonight over interior and Gulf coast areas, potentially reducing visibility to less than a mile in spots. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY There is a slight chance of thunderstorms Thursday over the Everglades, East coast metro areas and adjacent Atlantic and Biscayne Bay waters. The slight chance of thunderstorms continues this weekend and extends over all of southern Florida and the adjacent waters. The risk of rip currents is expected to increase along the Atlantic beaches late Friday and be elevated through the upcoming weekend. .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. Molleda
The Miami radar (KAMX), 4 km away, was scanning. The volume nearest the first event began at 17:19 UTC.
1 funnel cloud. Local standard time, as filed.
A report of a funnel cloud was relayed to an off duty NWS meteorologist at 120 PM EDT. Photo shows it extending at least halfway to the ground.
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, April 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: 750493.