A weak low formerly across South Florida slowly progressing towards the NE along with a weak frontal boundary over the region allowed convection to initiate across the region with scattered to numerous showers and thunderstorms. Plentiful low-level moisture in place and light steering flow allowed for training and back-building.
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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 weak low formerly across South Florida slowly progressing towards the NE along with a weak frontal boundary over the region allowed convection to initiate across the region with scattered to numerous showers and thunderstorms. Plentiful low-level moisture in place and light steering flow allowed for training and back-building. Heavy rainfall rates associated with these storms/showers lead to flooding of streets across portions of 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 Aug 26, 9:40 AM EST, 2 hours 20 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 1040 AM EDT Mon Aug 26 2019 .UPDATE... Isolated to scattered showers and thunderstorms have developed along a boundary extending across South Florida this morning from the offshore Atlantic waters into the Gulf waters. Expect the greatest storm coverage to be focused along this boundary over the next several hours, becoming more focused over the east coast metro and Lake Okeechobee region as afternoon heating continues and an Atlantic sea breeze develops. Updated the near-term PoPs and sky coverage based on the latest satellite, radar and observational trends. Otherwise, the forecast remains on track and no significant changes are expected. && .PREV DISCUSSION... /issued 813 AM EDT Mon Aug 26 2019/ AVIATION... Primarily VFR cond. throughout the period outside of afternoon convection today. With light SW synoptic flow, expect the development of both Atlantic and Gulf sea breezes this afternoon. Convection will be favored over the Gulf coast and interior early afternoon and shift over the east coast and Lake Okeechobee region later this afternoon. Expect MVFR CIGS and VIS in and around any storms that form today. TEMPOS for low CIGS/VIS may be needed for east coast sites this afternoon, especially PBI. PREV DISCUSSION... /issued 353 AM EDT Mon Aug 26 2019/ DISCUSSION... The overall pattern is slow to change for the beginning of the week. A weak low, which was over the area this past weekend, is slowly progressing to the northeast. Behind it, there is a weak boundary draped over the region. This boundary should act as a mechanism to allow convection to initiate across South Florida. there is some ridging at 500mb, but it is fairly weak, and should do little to inhibit convection. The GFS, which had been hinting at some drier air trying to move in by the middle of the week, has backed off and keeps PWATS generally over 2 inches through the week. By the middle of the week, a vigorous 500mb trough moves across the northern US, and picks up the sfc low, which is sitting off the Carolina coast by tomorrow. As it does, a high should build over the Gulf of Mexico. Between the low exiting the area and the high building to the west, northwest flow should develop for the middle of the week, which should cause higher chances for convection over southeast Florida, although almost the entire area has likely PoPs for Wednesday. By Thursday, the pattern becomes more neutral at the surface, and at 500mb. This will allow for a lighter steering flow, and the opportunity for sea breeze driven convection. Models seem to be favoring the interior and Gulf coast for Thursday and Friday, although there is a chance of showers and storms across the entire area both days. The weekend is the main concern for the forecast package as we watch the progression of tropical storm Dorian. Given the high uncertainty, the forecast remains close to climo. Keep up to date with the latest forecast as the week progresses. This is a good reminder as we head into peak hurricane season to get your plan and supplies in order. MARINE... Showers and thunderstorms remain possible through the week. A low pressure system that is slowly strengthening off the Carolina coast may bring a northeast swell to the Palm Beach Coast. While seas are generally forecast to run 1 to 3 feet, they may build in the area of the swell to 4 to 5 feet by late tomorrow into Wednesday. The wind today is forecast to be generally out of the southwest, then turn more northwest tomorrow and Wednesday, with the wind over the Atlantic waters turning northeast by Wednesday evening. the remainder of the week will have variable wind, depending on your location. There is a potential for a tropical feature to move into the area next weekend. However, there is a large amount of uncertainty with this system at this time. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 88 77 91 77 / 70 40 50 40 Fort Lauderdale 88 79 91 78 / 60 40 60 40 Miami 88 80 92 78 / 50 30 70 30 Naples 87 80 89 78 / 30 20 30 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && UPDATE...18/Weinman/88/ALM
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 1205 PM EDT Mon Aug 26 2019 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 270415- 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- 1205 PM EDT Mon Aug 26 2019 ...Storms Today May Produce Locally Heavy Rainfall & Gusty Winds... This hazardous weather outlook is for South Florida. .DAY ONE...THIS AFTERNOON AND TONIGHT Thunderstorms: Scattered to numerous thunderstorms will continue across South Florida through the afternoon. The greatest coverage is expected to be across the Lake Okeechobee region and east coast later this afternoon. The main hazards are heavy downpours, gusty winds, and lightning. Flooding: Periods of heavy rainfall are possible with any showers and storms. Some activity may train across some areas more than once, leading to the threat for ponding of water along streets and in low lying areas. This threat will be highest across the urban areas of the east coast metro this afternoon and evening. Waterspouts: Isolated waterspouts are possible across all South Florida waters today. Wind: The strongest thunderstorms will be capable producing wind gusts up to 50 mph, mainly across the Lake Okeechobee region and east coast this afternoon. Temperatures: Warm and humid conditions will lead to heat indices above 100 across much of South Florida today. A few hours of heat indices above 105 are possible for the Gulf Coast. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY Scattered to locally numerous storms are expected each day through the week across South Florida. The highest coverage will generally be along the east coast. The main hazards will be lightning and locally heavy rainfall. A small northeasterly swell may move through the local Atlantic waters mid to late week, bringing an increasing rip current risk. The approach of the New Moon late this week will bring an increase in tidal levels. Tropical Storm Dorian is forecast to move through the Caribbean mid to late week and potentially be in the Bahamas by late week into the holiday weekend. It is still too soon to know what the potential impacts to South Florida may be. Please continue to monitor the progress of Dorian through the week. .SPOTTER INFORMATION STATEMENT... Widespread spotter activation is not anticipated, however individual spotters are encouraged to report high winds and 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.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Picture received via social media of a flooded intersection at 18th Court and Flagler Street in Miami. Water was reportedly more than a foot deep. Nearby automated rain gauges measured 2.5 to almost 3 inches of rain in only an hour.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2019Every state in 2019This day in weather historyWarnings in Florida, August 2019
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: 850768.