A stationary surface boundary over South Florida with influence from a deep mid and upper level trough over the eastern United States led to diurnal showers and thunderstorms which produced heavy rainfall on the 8th and 9th of September.
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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 stationary surface boundary over South Florida with influence from a deep mid and upper level trough over the eastern United States led to diurnal showers and thunderstorms which produced heavy rainfall on the 8th and 9th of September.
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 8, 11:48 AM EST, 2 hours 22 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Miami FL 1248 PM EDT Mon Sep 8 2025 ...New UPDATE, AVIATION... .KEY MESSAGES... Updated at 1215 PM EDT Mon Sep 8 2025 - Heavy rainfall in a short period of time could result in localized flooding. - Excessive cloud to ground lightning is possible with storms, When Thunder Roars Go Indoors. && .UPDATE... Issued at 1215 PM EDT Mon Sep 8 2025 Analysis early this afternoon reveals an atmosphere that remains conducive for pockets of heavy rainfall and isolated localized flooding. ACARS and mesoanalysis observational data depict a saturated vertical profile with a classic Skinny CAPE orientation, PWAT values close to the 90th percentile for the date, slow mid and upper level wind vectors, and light southerly to southwesterly 850mb flow. In addition, all three major components for thunderstorm development will be met today which are: 1) Moisture, 2) Instability, and 3) Lift. Moisture continues to stream northwards from the Gulf and Caribbean via light southerly flow, Instability will continue to increase as diurnal heating continues to allow for us to heat up. Lift will be generated by sea-breeze circulations and outflow boundaries as they collide and interact with each other. While widespread rainfall accumulations of less than 1 inch are forecast, locations directly underneath slow moving thunderstorms could pick up several inches of rainfall in a short period of time. Rainfall rates of 3-5 inches an hour may result in localized bulls-eyes of higher precipitation, which may cause street/urban flooding if it occurs over vulnerable poor- drainage urban areas. Mesoscale models have been pretty fickle lately, depicting different solutions from run to run. Rather than focusing on potential convective evolution, I'll just focus on the two main pressing hazards which are: 1) heavy rainfall/localized flooding and 2) cloud to ground lightning. && .SHORT TERM... (Today through Tuesday) Issued at 334 AM EDT Mon Sep 8 2025 Model and synoptic analyses depict a deep mid/upper lvl trough descending upon the US east coast, while a sfc stationary boundary remains stretched across the central Gulf and central Fl. An attendant low meanders around the eastern Gulf waters. Meanwhile, the northern half of the peninsula remains at the base of the trough, which may contribute a little better dynamic support for stronger thunderstorms this afternoon. In general, the synoptic setup will be very similar to the previous days as abundant moisture remains trapped across SoFlo, with PWATs from MFL upper air and model soundings remaining in the 2.2-2.5" range. NBM and ensembles keep high-end POPs in place for the short term, mainly in the 75 to 85 percent range each afternoon. Also, pressure gradients remain very weak, with light S/SW flow prevailing across the area. Sea breeze boundaries should again be the focal points for deeper convection. High-res solutions show max rainfall in the 1-2" in general, but with potential for locally isolated 3" or higher. WPC is keeping all of SoFlo under a marginal risk of excessive rainfall (level 1 of 4), mainly for this afternoon, along with potential for isolated risk of flash flooding. Slow-moving or stationary thunderstorms over urban areas may produce the ideal conditions for significant flooding in urban metro areas. Some storms may become strong (isolated severe cells possible), with main hazards being gusty winds, lightning strikes and heavy rain. Similar to yesterday, the expected widespread cloud cover in the afternoon hours should not preclude daytime heating during the morning hours. Therefore, max temps should again reach the upper 80s over northern areas, and low-mid 90s elsewhere before shower and thunderstorm activity intensifies. The overall weather pattern continues on Tuesday, with the aforementioned stationary front still lingering across C FL keeping abundant moisture in place. Max POPs also remain in the 75-85% range, and a repeat of daytime heating/sea breeze and outflow boundary interactions. && .LONG TERM... (Tuesday night through Sunday) Issued at 334 AM EDT Mon Sep 8 2025 The rather soggy/moist weather pattern continues through much of the week as model guidance keep a lingering front around C FL through at least Thursday, then very slowly pushing it southward through the weekend. The above normal moisture will linger over SoFlo, with ensembles still showing potential for a low developing around the northern portions of the peninsula later in the week. Uncertainty remains high regarding the details of this feature and its potential impacts. The overall wet pattern should continue through the end of the work week. The risk of flooding will likely peak in the Wed-Thu timeframe as the boundary slides into the southern tip of the peninsula. Then beginning on Fri, drier air finally begins to filter from the north and POPs slowly decrease. But enough remnant moisture should remain in place for at least high-end scattered coverage through Sunday. Maybe the first true change in the ongoing weather pattern will be a likely drop in temperatures for the weekend with the arrival of a drier/slightly cooler air mass behind the FROPA. Not much cooler, but afternoon max temps will likely be in the mid-upper 80s by Saturday. && .AVIATION... (18Z TAFS) Issued at 1215 PM EDT Mon Sep 8 2025 Light west-southwesterly flow continues at the time of 18z TAF issuance, however sea-breeze circulations should veer winds onshore along both coasts shortly with SHRA/TSRA developing between 18-20z and overspreading the region. TEMPOs have been added to better time out potential terminals impacts (erratic wind shifts, sub MVFR cigs and vis). L/V winds will prevail after sunset. && .MARINE... Issued at 334 AM EDT Mon Sep 8 2025 A light to moderate south-southwesterly wind continues today across most of the local waters, becoming generally light and variable by mid week. Scattered to numerous showers and thunderstorms will be possible each day through the forecast period with rough seas and gusty winds briefly accompanying thunderstorms. && .PRELIMINARY POINT TEMPS/POPS... Miami 77 90 78 91 / 70 70 40 60 West Kendall 76 90 76 91 / 60 70 30 60 Opa-Locka 77 91 77 92 / 70 70 40 60 Homestead 76 89 76 90 / 60 60 30 50 Fort Lauderdale 76 90 77 91 / 70 70 50 60 N Ft Lauderdale 77 91 78 92 / 70 80 50 70 Pembroke Pines 77 92 77 93 / 70 70 40 60 West Palm Beach 76 90 76 91 / 70 80 60 70 Boca Raton 75 91 76 92 / 70 80 50 70 Naples 77 89 77 90 / 70 80 50 70 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && SHORT TERM...17 LONG TERM....17 AVIATION...Hadi
The national radar mosaic for the moment the first event began.
6 flood. Local standard time, as filed.
Trained spotter reports minor street flooding in Brownsville on NW 36th Street between Northwest 37th Ave and Northwest 22nd Ave. Spotter mentioned that water was across both lanes in low spots.
Member of the public shared footage of significant street flooding occurring on Sheridan Street East of US1 in Hollywood. Water up halfway to car tires.
Off duty NWS employee shared photos of parking lot flooding occurring after heavy rainfall occurred.
Broadcast media shared video of street flooding occurring in Delray Beach at the intersection of Atlantic Avenue and Jog Road.
Marco Island Police Department shared several photos of significant street flooding near the Rose Marina in north-eastern Marco Island. Water appears to be above tire level in the photographs with water over the curbs.
Broadcast media shared social media video of significant street flooding ongoing in Marco Island. Road still passable in the far center lane although water is approaching halfway up car tires.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2025Every state in 2025This day in weather historyWarnings in Florida, September 2025
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: 1295442, 1295445, 1295443, 1295444, 1295446, 1295447.