Surface high pressure over the southern tip of South FL prompted light low-level westerly flow across the region while a mid-upper level low pressure area moved westward across the FL Straits. This allowed for plenty of moisture to plague the area.
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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.
Surface high pressure over the southern tip of South FL prompted light low-level westerly flow across the region while a mid-upper level low pressure area moved westward across the FL Straits. This allowed for plenty of moisture to plague the area. Heavy rainfall and rounds of repeated showers and thunderstorms produced flooding across sections 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 Jul 27, 12:36 PM EST, 1 hour 24 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 136 PM EDT Tue Jul 27 2021 .AVIATION(18Z TAFS)... Scattered showers and storms this afternoon along the sea breeze convection. Brief MVFR ceilings/vis are possible near and in any afternoon thunderstorms with brief heavy rain and gusty winds. Light and variable winds overnight. && .PREV DISCUSSION... (Issued 1253 PM EDT Tue Jul 27 2021) AVIATION(18Z TAFS)... Scattered showers and storms this afternoon along the sea breeze convection. Brief MVFR ceilings/vis are possible near and in any afternoon thunderstorms with brief heavy rain and gusty winds. TEMPOs may need to be added with amendments for restrictions. Light and variable winds overnight. Light winds before seabreezes develop tomorrow with another round of showers and storms tomorrow afternoon. PREV DISCUSSION... (Issued 947 AM EDT Tue Jul 27 2021) UPDATE... Morning showers and storms have remained mainly over the local waters this morning with only a few isolated showers brushing along the coast. Moisture remains across the area with scattered showers and thunderstorms this afternoon. Very light wind profile in the 12Z MFL sounding will cause for slow storm motion once again today. Storms will mainly develop along sea breeze and outflow boundaries this afternoon and evening. A few strong storms cannot be ruled out today with frequent to excessive lightning activity, torrential rainfall combined with slow storm motion which could lead to urban flooding, and gusty winds. High temperatures today will be in the low 90s today with heat index values near 100 or low 100s. PREV DISCUSSION... (Issued 358 AM EDT Tue Jul 27 2021) Warm, wet pattern continues across South Florida this week... SHORT TERM (Today through Wednesday)... The warm, wet pattern continues as South Florida sits on the western periphery of surface high pressure centered over the Atlantic. The surface low pressure that had been off the northeast Florida coast has moved into Georgia. Light wind flow will allow boundaries to be the main drivers of convective focus, particularly any sea or lake breezes that form and advance inland. A boundary lifting across the area from the south could help act as another focus for convective initiation today as well. Temperatures aloft are still fairly warm with 500 mb temps of -6 to -4 deg C. Diurnal heating should provide plentiful amounts of surface-based instability with high temperatures today reaching into the lower to mid 90s today. Factoring in the humidity and light winds, apparent temperatures will reach into the lower 100s across much of the area. Some strong storms cannot be ruled out today with frequent to excessive lightning activity, torrential rainfall which could lead to urban flooding, and strong wind gusts. Precipitable water values continue to linger in the 2.25 to 2.50 inch range across South Florida today. To the southeast of the area, a tropical upper tropospheric trough (TUTT) is moving into the southern Bahamas and eastern Cuba. Ahead of the TUTT is an area of subsidence and relatively drier air which could help limit convection overnight, particularly over southeastern portions of the area. As the TUTT approaches, shower and storm chances will increase on Wednesday. The arrival of the TUTT will allow for a differential boundary between the relatively drier air and the incoming moisture that could serve as a focus for storms from southeast to northwest as it overspreads the region. Some storms could be strong again on Wednesday. LONG TERM (Thursday through Monday)... As the TUTT departs on Thursday, convection will start trending towards a more normal diurnal pattern. The deep-layered ridge of high pressure will attempt to build aloft again but another TUTT (or even an upper level low) emerges over the Bahamas on Saturday and pushes westward into the area to close out the extended forecast period on Monday. Obviously, the exact characteristics and timing of these features will have impacts to the forecast, particularly the periods of more active weather and the lulls in convection. MARINE... Light wind and the lack of any major surface low pressure in the region should keep seas 2 feet or less outside of locally higher waves due to showers and thunderstorms through most of the week. Passing upper level disturbances could bring thunderstorms to the waters outside of the normal diurnal/nocturnal pattern. Mariners should monitor the latest forecast and remain aware of current conditions. && .PRELIMINARY POINT TEMPS/POPS... Miami 78 92 78 92 / 30 50 20 60 West Kendall 77 93 77 93 / 30 50 20 50 Opa-Locka 78 93 77 92 / 30 50 20 60 Homestead 77 91 77 91 / 20 40 20 50 Fort Lauderdale 78 92 78 91 / 30 50 20 60 N Ft Lauderdale 78 92 78 90 / 40 50 20 60 Pembroke Pines 77 92 77 91 / 30 50 20 60 West Palm Beach 76 92 77 92 / 40 50 20 60 Boca Raton 78 92 78 92 / 40 50 20 50 Naples 78 91 78 91 / 30 40 20 50 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && Update/Aviation...Kelly Today through Wednesday and Marine...99 Wednesday Night through Monday...RAG 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 940 AM EDT Tue Jul 27 2021 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 280145- 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- 940 AM EDT Tue Jul 27 2021 ...Scattered to Numerous Thunderstorms Today... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Thunderstorms: Scattered to numerous showers and thunderstorms are possible, mainly this afternoon. Frequent lightning, heavy downpours, and gusty winds will be the primary hazards with the strongest thunderstorms. Waterspouts: Isolated waterspouts are possible over the local South Florida waters. Flooding: Localized flooding is possible due to slow moving heavy downpours from thunderstorms over low-lying and poor drainage areas. Wind: A few storms could become strong producing wind gusts up to 45 mph. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Scattered to numerous showers and thunderstorms are possible. Frequent lightning, heavy downpours, and gusty winds will be the primary hazards with the strongest thunderstorms. .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.
A member of the public reported via social media street flooding, with water covering all lanes except the center turn late on W 12 Avenue between 60th and 68th Streets in Hialeah.
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, July 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: 970697.