A frontal boundary stalled over Central Florida brought a warm and very moist airmass over South Florida, which combined with ample lift from mid-level troughing to develop widespread slow-moving showers and thunderstorms over the area during the afternoon and evening.
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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 frontal boundary stalled over Central Florida brought a warm and very moist airmass over South Florida, which combined with ample lift from mid-level troughing to develop widespread slow-moving showers and thunderstorms over the area during the afternoon and evening.
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 Sep 10, 6:51 PM EST, 5 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 751 PM EDT Tue Sep 10 2024 ...New UPDATE, AVIATION... .UPDATE... Issued at 737 PM EDT Tue Sep 10 2024 Scattered to numerous showers and thunderstorms continue across a good portion of the area this evening, however, these storms will gradually diminish across most areas as the evening progresses due to loss of diurnal heating. The exception to this will be over the local waters as well as the east coast, where additional shower and thunderstorm activity may possible during the overnight hours. With abundant moisture still in place, showers and storms that move onshore overnight across the east coast may contain heavy downpours and could bring the possibility of localized flooding. Low temperatures tonight will generally range from the mid 70s across the Lake Okeechobee region to the upper 70s along the east and west coast. && .SHORT TERM... (Rest of today through Wednesday) Issued at 138 PM EDT Tue Sep 10 2024 It's a rinse and repeat forecast through the short term as abundant low-level moisture and coastal convergence continue to produce numerous showers and thunderstorms across the area today and tomorrow afternoons. A frontal boundary remains stalled over central Florida, helping pool anomalous moisture over the region as evidenced by MLF's 12Z sounding which showed PWATs of 2.33 inches, well above the 90th percentile for this time of year. The sounding also showed light sfc-3km southerly flow and ample instability (SBCAPE >4000 J/kg), along with light WNW flow aloft. Given this setup, the main concern for today remains heavy rainfall which could lead to localized flooding for portions of South Florida. Some isolated activity already developed along the southeast coast this morning, dumping 1-2 inches across portions of the Broward-Palm Beach metro. Activity this afternoon will initiate further west over inland metro and interior portions of South Florida, with LPMM and other ensemble guidance hinting at some spots over the interior getting 3-6" of rain. Outside of any storms, it will be another relatively hot and humid day with peak heat indices approaching or even exceeding 105 degrees in spots. The pattern will remain pretty much unchanged on Wednesday as the front is forecast to remain stalled over central Florida. && .LONG TERM... (Wednesday night through next Monday) Issued at 250 PM EDT Tue Sep 10 2024 Mid-level ridging will remain over the Gulf of Mexico through the remainder of the work week, thus lifting Francine into the southeastern CONUS. With Francine's circulation and northeasterly progression inland, this will lift Florida's stationary boundary further northward later this week. With the abundant moisture moving northward, this will allow for slightly drier air to enter the region and a break from the above normal PWATs and moisture, though still plentiful moisture available. By late this week, the PWATs will decrease slightly, but ensembles still forecast values near 2.0". For the latter half of the week, PoPs will be 50-70% with the best chances for rain and thunderstorms in the northern & interior portions of South FL. Moving into the weekend and beyond, there is uncertainty for the weekend and beyond, due to the potential development of a low pressure system off the southeastern CONUS coast. At this moment, due to the extent of forecast, timing and location varies among the ensembles. The low's development may have an impact on our region's moisture and PoPs, but for now, the PoPs are forecast near seasonal at 40-60% with the primary forcing mechanism being sea breezes. There is no relief in sight for the warm temperatures this mid- September. This week will wrap up and move into the weekend with highs remaining in the low 90s and heat indices in the 105-110 range. More heat advisories may be needed in the future, but it will be dependent on the storm and cloud coverage. && .AVIATION... (00Z TAFS) Issued at 737 PM EDT Tue Sep 10 2024 Some light to moderate rain continues this evening across a good portion of the east coast terminals. While this round of showers will gradually diminsh as the evening progresses, additional shower activity may develop near the east coast terminals overnight. Light winds overnight will increase out of the SE Wednesday afternoon as the sea breeze pushes inland. Another round of storms will develop near the east coast terminals in the afternoon. At KAPF, winds will increase out of the SW Wednesday afternoon. && .MARINE... Issued at 138 PM EDT Tue Sep 10 2024 Light southeasterly winds will continue across most of the local waters through the middle portion of the week. Seas across the Atlantic waters will remain at 3 feet or less while seas across the Gulf waters remain at 2 feet or less. Scattered to numerous showers and thunderstorms will be possible each day. Winds and seas could be locally higher in and around showers and storms. Elevated seas and swell associated with Tropical Storm Francine may reach the Gulf waters late this week. && .BEACHES... Issued at 138 PM EDT Tue Sep 10 2024 Light easterly flow will result in a moderate threat of rip currents along Palm Beach county beaches through the end of the week. Increasing swell associated with distant Tropical Storm Francine may result in increasing rip current risks for the Gulf beaches later this week. && .PRELIMINARY POINT TEMPS/POPS... Miami 78 91 80 91 / 60 70 50 50 West Kendall 77 91 77 92 / 50 60 40 50 Opa-Locka 78 92 79 92 / 60 70 50 50 Homestead 78 91 79 91 / 50 60 40 40 Fort Lauderdale 78 89 79 90 / 60 70 60 50 N Ft Lauderdale 78 90 79 91 / 60 80 60 50 Pembroke Pines 78 93 80 93 / 60 80 50 50 West Palm Beach 77 91 78 91 / 70 80 60 50 Boca Raton 78 91 79 92 / 70 70 60 50 Naples 78 91 79 91 / 30 60 30 50 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && SHORT TERM...ATV LONG TERM....JS AVIATION/UPDATE...CWC
Hazardous Weather Outlook National Weather Service Miami FL 352 PM EDT Tue Sep 10 2024 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 112000- 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 County-Metro Palm Beach County- Coastal Collier County-Inland Collier County-Inland Broward County- Metro Broward County-Inland Miami-Dade County- Metropolitan Miami Dade-Mainland Monroe-Coastal Palm Beach County- Coastal Broward County-Coastal Miami Dade County-Far South Miami- Dade County- 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- 352 PM EDT Tue Sep 10 2024 ...Numerous Showers and Thunderstorms This Afternoon... ...Moderate Risk of Rip Currents Palm Beaches... This Hazardous Weather Outlook is for Atlantic coastal waters, southeast Florida, southern Florida, southwest Florida, and Gulf of Mexico. .DAY ONE...This afternoon and tonight. Thunderstorms: Numerous showers and thunderstorms are expected this afternoon and early evening across South Florida. These storms will be capable of producing heavy rainfall, frequent lightning, and gusty winds. Flooding: With slow moving storms containing heavy downpours, there will be the potential for localized flooding mainly over low-lying and poor drainage areas, particularly portions of the east coast metro. Rip Currents: There is a moderate risk for rip currents along the Palm Beaches today. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered to numerous thunderstorms will be possible each day through the period. Some storms could become strong with threats of gusty winds, frequent lightning, and heavy downpours. Multiple rounds of heavy downpours could create the potential for localized flooding, especially across the metro areas along the east and west coast through the middle portions of the work week. The risk for rip currents will remain elevated mainly for the Palm Beaches through most of the week. Peak heat index values will remain elevated and may reach advisory level criteria at times throughout the upcoming week. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report high wind, hail, and flooding to the National Weather Service forecast office in Miami.
Special Weather Statement
National Weather Service Miami FL
240 PM EDT Tue Sep 10 2024
FLZ067-068-168-101915-
Coastal Palm Beach County FL-Inland Palm Beach County FL-
Metro Palm Beach County FL-
240 PM EDT Tue Sep 10 2024
...A strong thunderstorm will impact portions of southeastern Palm
Beach County through 315 PM EDT...
At 240 PM EDT, National Weather Service meteorologists were tracking
a strong thunderstorm over Hamptons At Boca Raton, or near Boca
Raton, moving northeast at 15 mph.
HAZARD...Wind gusts of 45 to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Boca Raton, Boynton Beach, Delray Beach, Highland Beach, Ocean Ridge,
Mission Bay, Hamptons At Boca Raton, Village Of Golf, Kings Point,
Dunes Road, Whisper Walk, Boca Del Mar, Loxahatchee NWR, Gulf Stream,
Briny Breezes, Fau South Campus, Boca West, South County Regional
Park, Morikami Park, and Villages Of Oriole.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.
Funnel clouds occasionally touch down and produce tornadoes or
waterspouts. Move indoors and stay away from windows.
&&
LAT...LON 2648 8005 2643 8006 2643 8007 2642 8006
2635 8007 2635 8028 2654 8027 2654 8005
2653 8005 2653 8006 2652 8005
TIME...MOT...LOC 1840Z 220DEG 14KT 2637 8019
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
HadiSpecial Weather Statement
National Weather Service Miami FL
317 PM EDT Tue Sep 10 2024
FLZ067-102000-
Inland Palm Beach County FL-
317 PM EDT Tue Sep 10 2024
...A strong thunderstorm will impact portions of southwestern Palm
Beach County through 400 PM EDT...
At 317 PM EDT, National Weather Service meteorologists were tracking
a strong thunderstorm 10 miles east of Okeelanta, or 11 miles
southeast of Belle Glade, moving southwest at 10 mph.
HAZARD...Wind gusts of 45 to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Holey Land Wildlife Refuge and Loxahatchee NWR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.
&&
LAT...LON 2665 8059 2654 8042 2635 8050 2636 8072
2648 8086
TIME...MOT...LOC 1917Z 040DEG 10KT 2655 8055
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
HadiThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Social media posts contained pictures and videos of street flooding with 6 inches of standing water near Collins Avenue and Northeast 23rd Street in Miami Beach after rounds of showers and thunderstorms moved through the area. Rainfall estimates in the area were 3 to 4 inches in a 3 hour timeframe.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2024Every state in 2024This day in weather historyWarnings in Florida, September 2024
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: 1215685.