Increase tropical moisture from southerly flow combined with sea breeze interactions allowed showers and thunderstorms to develop over interior portions of South Florida. One of these thunderstorms produced a funnel cloud.
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The episode as NWS MFL wrote it up.
Increase tropical moisture from southerly flow combined with sea breeze interactions allowed showers and thunderstorms to develop over interior portions of South Florida. One of these thunderstorms produced a funnel cloud.
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 May 30, 6:35 AM EST, 3 hours 20 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Miami FL 735 AM EDT Tue May 30 2017 .UPDATE... As of 735 AM EDT...Quick update to the forecast early this morning to account for scattered showers developing over parts of the east coast metro and local Atlantic waters, and updated PoPs to chance in these areas. These showers are developing in an increasingly moist southeasterly low-level flow, typical of a diurnal summertime pattern, and also aided by a weak land breeze noticed especially in portions of Broward and Palm Beach counties. These showers will generally be brief as they move ashore during the morning hours, but some areas may see some brief heavy rain with the heaviest showers. As the Atlantic sea breeze kicks in later this morning into the early afternoon, these showers will dissipate and give way to scattered showers/storms focused mainly over the interior. && .AVIATION... VFR flying conditions will generally prevail through the TAF period ending 12z Wednesday. A moist prevailing southeast low- level flow will allow for some showers to develop this morning and impact the east coast sites, where VCSH was indicated until 17z. After 17z, scattered showers/storms are expected to develop and generally remain west of the east coast sites, with VCSH indicated at KAPF beginning at 18z, and VCTS at 22z. Light and variable winds will become southeast around 10 knots by the late morning at the east coast sites, except southwesterly at KAPF as local sea breeze effects take over. && .PREV DISCUSSION... /issued 358 AM EDT Tue May 30 2017/ DISCUSSION... Short Term (Today-Wednesday): High temperatures will once again be in the 90s across South Florida. A more prominent SE flow will bring more moisture and higher chances of afternoon showers and thunderstorms across the interior where the Atlantic and Gulf sea breezes will collide. Moisture will continue to rise Wednesday with a better chance of activity. Long Term (Thursday-Tuesday): Upper level ridge continues to slowly move east into the Atlantic along with the surface high. South Florida will see a more southeasterly flow and even more moisture. Latest Models show Precipitable water values rising to around 1.9 inches by he end of the work week. With more low-level moisture combined with sea breeze and outflow boundary interactions, potential for showers and thunderstorms will also increase as well as coverage. Rain chances during the afternoon and evening hours will be mainly concentrated in the interior and Lake Okeechobee regions. During the morning hours showers and storms will be concentrated over the waters. Temperatures in the long term temps will be near normal around 90 degrees. Temps will not be as high as they will be regulated with precipitation and a more brisk sea breeze not allowing them to reach the mid to upper 90s like the past few days. MARINE... A light to moderate SE wind 10 to 15 knots, with occasional gusts will persist through the end of the week. Seas will be generally 2 to 4 feet. Chances for scattered showers and thunderstorms will increase tomorrow through late week. FIRE WEATHER... Moisture will increase today with a more persistent a light southeast wind. This will bring moisture into the interior and allow relative humidity values to stay above critical values, this will continue through the rest of the week. There is a chance of showers and thunderstorms in the interior and Lake Okeechobee region today. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 91 78 89 77 / 30 10 20 20 Fort Lauderdale 90 80 89 79 / 30 10 20 20 Miami 91 80 89 79 / 30 10 20 20 Naples 92 76 92 75 / 30 20 40 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && UPDATE...92/IRL DISCUSSION...33/Kelly MARINE...33/Kelly AVIATION...92/IRL FIRE WEATHER...33/Kelly
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 905 AM EDT Tue May 30 2017 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 311200- 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- 905 AM EDT Tue May 30 2017 ...THUNDERSTORMS POSSIBLE MAINLY INTERIOR AND GULF COAST TODAY... ...HEAT INDICES NEAR 100 DEGREES FOR MUCH OF INTERIOR... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Thunderstorms: Scattered thunderstorms are possible across South Florida, but best chances are for the Gulf coast and interior areas this afternoon and early evening. The primary threats will be frequent cloud to ground lightning and brief heavy rainfall. Temperatures: Heat indices will be near 100 degrees, or slightly warmer, in the interior region of South Florida late this morning and through the afternoon. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Thunderstorms are possible mainly over interior sections Wednesday. There is a chance of thunderstorms for all areas Thursday through Saturday, mainly during the afternoon. The primary threat with this activity will be lightning and locally heavy rainfall. No other Hazardous weather is expected at this time. .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), 71 km away, was scanning. The volume nearest the first event began at 14:55 UTC.
1 funnel cloud. Local standard time, as filed.
A member of forest service reported a brief funnel cloud just south of I-75 in Broward County. The funnel never extended to the ground.
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, May 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: 698000.