A mid to upper level trough of low pressure in the vicinity of South Florida along with deep tropical moisture lead to the development of showers and thunderstorms over the area. One of these storms produced a funnel cloud as it moved over the communities near Lake Okeechobee.
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The episode as NWS MFL wrote it up.
A mid to upper level trough of low pressure in the vicinity of South Florida along with deep tropical moisture lead to the development of showers and thunderstorms over the area. One of these storms produced a funnel cloud as it moved over the communities near Lake Okeechobee.
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 Aug 10, 10:42 AM EST, 3 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 1142 AM EDT Thu Aug 10 2017 .UPDATE... Active weather pattern this morning as a trough of low pressure edges westward over the South Florida peninsula. The morning MFL sounding indicated an impressive 2.05" of PWAT, with even higher values offshore, as seen on satellite derived PWAT. CAPE is long and skinny, which is indicative of a tropical atmosphere. The high moisture content may lead to an additional flooding concern, as heavy rain already led to areas of ponding of water and minor east coast metro street flooding earlier today. As this system continues its journey westward over the peninsula this afternoon, showers and thunderstorms with heavy rain remain likely, especially over the interior and Gulf coast. && .PREV DISCUSSION... /issued 826 AM EDT Thu Aug 10 2017/ AVIATION... A wet start to the day along the east coast TAF sites with heavier showers beginning to move slowly westward over the region. A lightning strike or two can not be ruled out over the next several hours, but low vis due to RA+ will likely be of higher concern. BKN/OVC bases with these clouds will range from around 1000-2000 ft agl. Showers and storms will likely continue through the day with a light south southeast wind aft 10/1500Z. PREV DISCUSSION... /issued 351 AM EDT Thu Aug 10 2017/ .HEAVY RAINFALL IS POSSIBLE TODAY INTO TONIGHT OVER SOUTH FLORIDA... DISCUSSION... A mid to upper level trough of low pressure extending from the Bahamas southwest into the Florida Keys will continue to move to the west northwest through South Florida today into tonight. This will allow for deeper tropical moisture to work into South Florida through tonight and increase the coverage of showers and thunderstorms over the area. The showers and thunderstorms will start to affect the east coast metro areas of South Florida this morning spreading into interior and west coast areas this afternoon. The early morning satellite images are also showing the PWAT values increasing to around 2 inches over the east coast metro areas. The PWAT values continue to increase to around 2.2 inches by this afternoon over all of South Florida, as the mid to upper level trough moves through the area. This will lead to heavy rainfall conditions over South Florida, and heavy rainfall wording will be added to the forecast for today into this evening. High pressure will then build back into South Florida for Friday into this weekend. This will allow for the sea breezes to develop and move inland each day. Therefore, the best coverage will be over the interior areas, but the metro areas will still see scattered showers and a few thunderstorms through the weekend. EXTENDED FORECAST... The disturbance north of the Leeward Islands is forecast by the long range models to move to the west northwest to northwest and should be east of the Bahamas early next week. NHC is giving this disturbance a 20 percent chance of development through early this weekend, and a 40 percent chance of development late this weekend into early next week. At this time, the long range models are also showing a front pushing into the Southeastern United States from the north for early next week. This in turn will allow for the disturbance to move more north northeast early next week and should keep the disturbance away from South Florida. The winds will also be more southerly early next week over South Florida focusing the showers and thunderstorms over the Lake Okeechobee region. However, all areas of South Florida will still see the typical summer time shower and thunderstorm activity. MARINE... The winds will be southerly at 10 knots or less today through Friday, before decreasing to around 5 knots or less from the easterly direction this weekend. This will keep the seas at 2 feet or less in both the Atlantic and Gulf water of South Florida through this weekend. FIRE WEATHER... The relative humidity will continue to remain well above the critical level over South Florida today into this weekend. The dispersion index today and Friday will be in the poor range, due to the light winds over the area. BEACH FORECAST... The threat of rip currents will also be lower today along the east coast beaches, as the winds will be more from the southerly direction with lower speeds compared to early this week. Therefore, there is a moderate risk of rip currents along the east coast beaches of South Florida for today. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 89 78 91 78 / 70 40 50 20 Fort Lauderdale 89 80 91 80 / 70 40 40 20 Miami 90 79 92 79 / 60 40 40 20 Naples 91 77 92 77 / 70 30 40 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && UPDATE...27/JT DISCUSSION...54/BNB MARINE...54/BNB AVIATION...27/JT BEACH FORECAST...54/BNB FIRE WEATHER...54/BNB
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 424 AM EDT Thu Aug 10 2017 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 102030- 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- 424 AM EDT Thu Aug 10 2017 ...THUNDERSTORMS TODAY COULD PRODUCE HEAVY RAINFALL... ...MODERATE RISK OF RIP CURRENTS ALONG ATLANTIC BEACHES... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Rip currents: There is a moderate risk of rip currents on Atlantic beaches today. Thunderstorms: Atlantic thunderstorms this morning will become more widespread as the day goes on. Heavy rainfall will be the primary threat. Flooding: Heavy rainfall possible from thunderstorms today could create minor flooding of low-lying and poorly drained areas. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY From Friday through Wednesday, thunderstorms will be possible, particularly during the afternoon and evening hours. The primary threat will be lightning. .SPOTTER INFORMATION STATEMENT... Widespread spotter activation is not anticipated, however individual spotters are encouraged to report flooding to the National Weather Service forecast office in Miami. For more information...visit the National Weather Service in Miami website at www.weather.gov/miami. RAG
The Miami radar (KAMX), 132 km away, was scanning. The volume nearest the first event began at 15:46 UTC.
1 funnel cloud. Local standard time, as filed.
A trained spotter reported a funnel cloud a few miles south of Pahokee. Time estimated from radar.
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, August 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: 718490.