S. continued to slide eastward as an associated frontal boundary at the surface approached the FL panhandle.
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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 mid-level trough over the Great Lakes region of the U.S. continued to slide eastward as an associated frontal boundary at the surface approached the FL panhandle. With deep southerly to southwesterly flow in place, rich moisture continued to advect into South Florida. This allowed for scattered to numerous showers and thunderstorms to develop across interior sections before pushing towards the east coast. Storm organization was multi-cellular with numerous outflow boundaries emanating from the sea breeze boundary collisions. Several days of heavy rainfall led to already saturated soils. Multiple reports of flooding were received across South Florida.
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 22, 6:48 AM EST, 12 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Miami FL 748 AM EDT Wed Sep 22 2021 .AVIATION(12Z TAFS)... Isolated and storms should continue to develop over South Floria this morning and become more numerous in coverage by this afternoon. There VCSH for most TAF sites this morning, except KMIA and KOPF where storms are over the east coastal areas currently. VCTS for all TAF sites after 15Z today. Tempo groups will more likely be needed for the TAF sites in the update package this morning or by the 18Z TAF sites for the afternoon hours. VFR conditions but could fall down into MVFR or even IFR conditions with the showers and thunderstorms. && .PREV DISCUSSION... (Issued 219 AM EDT Wed Sep 22 2021) SHORT TERM... Today through Thursday A mid-level trough over the Great Lakes region of the United States continues to slide eastward today as an associated frontal boundary at the surface approaches the Florida Panhandle. A plume of deep tropical moisture will remain established across South Florida as we remain to the south of this boundary as precipitable water values remain upwards of 2.0 inches with a saturated vertical profile. Prevailing flow will shift to a more southwesterly direction during the day today in response to the influence of the approaching frontal boundary, which will act to focus the greatest coverage of showers and thunderstorms across the interior and east coast metro areas on Wednesday. Shower and thunderstorm activity will be greatest during the afternoon hours as ample insolation and differential heating will set the stage for updraft development and growth. Storm organization will be multi-cellular in nature with new development occurring along propagating outflow boundaries and sea- breeze collisions. With prevailing southwesterly flow and the development of a pinned sea-breeze boundary along the east coast metro areas, enhanced convergence may lead to the development of slow-moving shower and thunderstorm activity. Repeated rounds of heavy rainfall over already saturated soils may result in localized flooding today. With the loss of diurnal heating after sunset, shower and thunderstorm activity should slowly diminish over land during the evening hours before increasing offshore overnight. A wet and stormy Thursday is expected as the frontal boundary continues to push southwards across the Florida peninsula. Southwesterly flow will prevail during the day allowing for the greatest coverage of shower and thunderstorm activity to be located across the interior and the east coast metro areas. As a moist airmass continues to remain in place ahead of the boundary, localized flooding concerns continue, especially in locations that have received repeated rounds of abundant rainfall over the last several days. LONG TERM (Thursday Night through Tuesday)... As all eyes focus on the first autumn cold front of the season, the pattern across south Florida will be mostly unchanged. Diurnally driven convection will continue through much of the up coming weekend. Globals show the frontal boundary stalling along or perhaps just south of the I-4 corridor through the weekend as the front becomes passive. With a relatively stagnant lower level flow, sea/gulf breeze activity will initiate each afternoon. The upper level synoptics become somewhat more interesting going into the start of the new workweek. Globals indicate our upper level flow will begin to shift to a drier northwesterly flow as a H5 upper level trough begins to amplify just a bit just downstream over the western Atlantic. This may help bring the aforementioned front back to life somewhat and bring it closer to the region. Spatial and temporal differences exist so the specifics are still a bit murky, however, with most guidance really drying the upper levels, started a slight downward trend in POPs/QPF toward the end of the period with the best rainfall potential residing along and south of Alligator Alley. AVIATION(06Z TAFS)... A few showers may briefly impact the east coast terminals early this morning. Light wind is expected throughout the period, although a westerly component will develop at APF during the afternoon hours. Convection should increase during the mid to late morning hours and push ashore. Greatest coverage of showers and thunderstorms will be over the eastern half of the peninsula. Sub-VFR conditons will be possible around convection. MARINE... As a frontal boundary approaches the region, winds will veer out of the south and southwest through late week. Outside of any shower or thunderstorm, overall marine conditons will remain benign. Scattered to numerous showers and thunderstorms are possible over the area waters throughout the rest of the week into the weekend. Waterspouts and locally higher winds and seas are also possible in showers and thunderstorms. && .PRELIMINARY POINT TEMPS/POPS... Miami 76 91 77 90 / 40 70 40 70 West Kendall 75 92 75 91 / 40 70 30 70 Opa-Locka 76 92 76 91 / 40 70 40 70 Homestead 74 90 74 89 / 30 60 40 70 Fort Lauderdale 76 90 77 89 / 50 70 40 70 N Ft Lauderdale 75 90 77 89 / 50 70 40 70 Pembroke Pines 75 90 75 89 / 50 70 40 70 West Palm Beach 74 90 75 89 / 50 70 50 70 Boca Raton 75 90 76 88 / 50 70 40 70 Naples 75 90 76 89 / 30 60 30 60 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && Update/Aviation...BNB Today through Thursday and Marine...Hadi Thursday Night through Tuesday...Frye Visit us at weather.gov/miami Follow us on Facebook and Twitter at: www.facebook.com/nwsmiami www.twitter.com/nwsmiami
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 334 AM EDT Wed Sep 22 2021 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 230145- 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- 334 AM EDT Wed Sep 22 2021 ...Localized Flooding Possible Today... ...Patchy Fog Possible Western Interior Areas... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Thunderstorms: Scattered thunderstorms are expected across South Florida today. Heavy rainfall, lightning, and gusty winds are the primary hazards. Flooding: Localized flooding of urban and/or poorly drained areas is possible due to heavy rainfall and slow storm motion. Waterspouts: A few waterspouts are possible over the local South Florida waters. Visibility: Patchy dense fog is possible over western interior areas through sunrise this morning. Localized visibility reductions to less than a mile or less may occur. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Scattered to locally numerous showers and thunderstorms are expected each day, primarily during the afternoon hours. Lightning and heavy rainfall causing localized flooding are the primary hazards. .SPOTTER INFORMATION STATEMENT... Widespread spotter activation is not anticipated, however individual spotters are encouraged to report high wind, hail 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.
Broadcast media relayed a video via social media that showed flooding with water covering Harding Avenue in Surfside from a heavy thunderstorm. Rainfall measurements in the area were around 1 inch which fell in less than an hour.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2021Every state in 2021This day in weather historyWarnings in Florida, September 2021
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: 984804.