A weakening front over extreme southern portions of Miami-Dade county generated a few showers and thunderstorms. Enhanced moisture and convergence associated with the boundary and sea breeze interactions allowed for a funnel cloud to form west of Homestead.
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The episode as NWS MFL wrote it up.
A weakening front over extreme southern portions of Miami-Dade county generated a few showers and thunderstorms. Enhanced moisture and convergence associated with the boundary and sea breeze interactions allowed for a funnel cloud to form west of Homestead.
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 26, 2:51 PM EST, 39 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 351 PM EDT Fri May 26 2017 .DISCUSSION... Rest of Today: A weakening front over the extreme southern part of Miami-Dade County is generating a few showers and thunderstorms. Enhanced moisture and convergence associated with this boundary, coupled with Atlantic and Gulf sea breezes currently moving inland, will produce scattered showers and thunderstorms. These will be mainly over interior portions of the far southern part of the peninsula through this evening. Saturday through Tuesday: The front will dissipate late tonight or early Saturday as deep layer high pressure builds in across the region. The high pressure will dominate South Florida's weather pattern Saturday through Tuesday. We can expect a mostly sunny and relatively dry Memorial Day Weekend. The only possible exception would be over the interior during the afternoons, when colliding sea-breezes could produce an isolated thunderstorm or two. Temperatures will be hot with highs ranging from upper 80s along the coast to mid 90s interior, and heat indices will be around 100 degrees. Wednesday through Thursday: The high pressure will gradually weaken and move east of the area by mid-week. This will allow winds to become east-southeasterly, ushering in higher levels of moisture from the tropics. Shower and thunderstorm activity may increase for the middle to latter portion of next week. && .MARINE... Isolated showers and thunderstorms are possible through tonight for Atlantic waters off Miami-Dade County. After that, relatively benign marine conditions will prevail through the middle portion of next week. && .AVIATION... Afternoon sea breeze passage (Atlantic and Gulf) has occurred or is imminent at all TAF sites. A few showers and thunderstorms may develop this afternoon inland from the southeast-most terminals (OPF, MIA, TMB) and may drift back toward the terminals before developing, so VCSH/VCTS was indicated. Otherwise VFR conditions will prevail. Winds will become light and variable between 00Z and 02Z. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 75 92 73 93 / 10 10 0 0 Fort Lauderdale 78 91 78 93 / 20 20 10 10 Miami 78 93 78 93 / 20 20 10 10 Naples 73 89 73 90 / 0 10 0 0 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && DISCUSSION...98/ABH MARINE...98/ABH AVIATION...22/KS
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 357 PM EDT Fri May 26 2017 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 270800- 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- 357 PM EDT Fri May 26 2017 ...ISOLATED TO SCATTERED STORMS POSSIBLE SOUTHERN AREAS THIS AFTERNOON... This hazardous weather outlook is for South Florida. .DAY ONE...THIS AFTERNOON AND TONIGHT Thunderstorms: Isolated to scattered thunderstorms are expected over the southern areas of South Florida through this evening, with the best coverage over the southern interior areas. The primary threats will be lightning. No other hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The weather will remain mostly dry this Memorial Day weekend into early next week. Heat index values are forecast to be near or above 100 degrees for much of South Florida. A typical summer weather pattern of thunderstorms returns to South Florida for the middle to end of next week. The primary hazards from the thunderstorms 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.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Miami FL
1152 AM EDT FRI MAY 26 2017
FLZ173-174-261615-
Far South Miami-Dade County FL-Coastal Miami Dade County FL-
1152 AM EDT FRI MAY 26 2017
...Significant Weather Advisory for the development of funnel clouds
for south central Miami-Dade County Until 1215 PM EDT...
* At 1151 AM EDT...Doppler radar was tracking a shower capable of
producing a funnel cloud along U.S. Highway 1 between Florida
City and the Key Largo Bridge, moving east at 15 mph.
* LOCATIONS IMPACTED INCLUDE...
Everglades National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This activity was also developing in an environment favorable for the
formation of funnel clouds. Stay tuned to NOAA weather radio and
local media for additional updates and possible warnings.
&&
LAT...LON 2523 8052 2536 8050 2537 8036 2532 8036
2530 8039 2529 8039 2529 8040 2527 8040
2528 8041 2526 8042 2526 8043 2525 8043
2526 8044 2524 8043 2525 8044 2525 8046
2523 8048 2524 8048 2520 8050
TIME...MOT...LOC 1551Z 265DEG 12KT 2530 8045
KScharfThe Miami radar (KAMX), 22 km away, was scanning. The volume nearest the first event began at 20:29 UTC.
1 funnel cloud. Local standard time, as filed.
A member of the public reported a brief funnel cloud west of Homestead. 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: 697993.