Prevailing light, east-southeasterly flow allowed for both the Gulf and Atlantic sea breeze to progress inland through peak heating hours. Drier air aloft centered over the Bahamas worked in concert with steepening low-level lapses to produce sufficient accent for showers and thunderstorms to develop within the saturated airmass.
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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.
Prevailing light, east-southeasterly flow allowed for both the Gulf and Atlantic sea breeze to progress inland through peak heating hours. Drier air aloft centered over the Bahamas worked in concert with steepening low-level lapses to produce sufficient accent for showers and thunderstorms to develop within the saturated airmass. Collisions between the sea breeze boundaries and additional outflow boundaries resulted in a few stronger storms that produced a funnel cloud over Palm Beach.
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 14, 9:16 AM EST, 2 hours 29 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 1016 AM EDT Fri Aug 14 2020 .Update... Isolated to scattered quick-moving showers are developing over the Broward/Palm Beach waters. Most of this convection is dissipating as it approaches the Atlantic metro region, owing to a decrease in the low-level convergent flow upon reaching land. With the exception of a stray isolated shower, the Atlantic metro should stay dry, as easterly flow advects a swath of drier air over the region. The 12Z MFL sounding indicates very little change in the synoptic pattern over the previous 24 hours. Weak easterly flow is present throughout most of the tropospheric column (up to 350 hPa) as well as a modest moisture profile, indicated by PWI of 1.95 ins. Expect storms to form along the Atlantic sea-breeze this afternoon across the interior, as the easterly flow pushes the sea-breeze inland. As convective cold pools propagate westward and congeal, multicell structures may develop. Isolated wind gusts of 40-50 mph are possible across the western interior region, as a broad region of roughly 1000 J/kg DCAPE encompasses most of this area. Other hazards include frequent lightning and localized heavy rainfall. Based on the aforementioned analysis and reasoning, PoPs have been increased along the western interior to account for an uptick in confidence. && .Prev Discussion... /issued 727 AM EDT Fri Aug 14 2020/ Aviation (12Z TAFs)... VFR conditions should prevail across most of the east coast TAF sites. Brief MVFR/IFR conditions may be experienced along the Atlantic coastline in association with quick-moving, pulse-type showers. This activity should gradually shift towards the interior by late AM/early PM and wane over the east coast, as the Atlantic sea-breeze moves inland. Convective coverage may increase near KAPF and west coast sites later this afternoon, however TEMPOs not necessary at this time. Winds predominately ESE except at KAPF, where Gulf Coast sea-breeze may cause SW wind shift. Prev Discussion... /issued 358 AM EDT Fri Aug 14 2020/ .Hot summer day with showers and storms possible again today... Short Term (Today through Saturday)... Another warm summer day with light east-southeasterly flow due to surface high pressure centered over the Atlantic. Aloft a trough over the southeastern United States will amplify into the Gulf of Mexico as a surface low and an associated trough moves from the Mid-Atlantic states into the Atlantic. A high aloft easing into the Bahamas could help to bring some drier air towards the area which could allow for slightly lower rain chances today. Sea breezes are expected to develop again with the Atlantic sea breeze favored by the easterly flow pattern. The Gulf sea breeze will be slightly restrained but should be able to advance inland to around the State Road 29 corridor. Therefore the highest PoPs today will remain over inland portions of Southwest Florida, though with a slightly earlier timing compared to normal as the sea breeze collisions should be earlier as well. Convection should diminish over the peninsula in the evening, once again shifting over the waters overnight. The pattern repeats similarly for Saturday though it will be worth watching if a drier pocket of air moves into the region in case rain chances may need to be adjusted lower. Temperatures will reach into the 90s both days with some heat index values reaching into the mid 100s over inland portions of Southwest Florida. Overnight lows will also remain warm, particularly along the Atlantic coast. Long Term (Sunday through Thursday)... For Sunday and Monday, models depict an amplifying trough across the SE CONUS, which begins to erode the western periphery of the Atlantic ridge. This setup will begin shifting overall winds across SoFlo to a more southerly, or even southwesterly flow at times. Thus, moisture advection from the Caribbean will increase, and together with daytime heating, will support afternoon scattered to numerous showers and thunderstorms. The flow will push best POPs into the interior/northern portions of the CWA, especially around the Lake region. By the middle of the work week, long range model solutions suggest another trough building over the Gulf region, further extending the streaming moisture from the south through the rest of the long term. POPs will be adjusted to around 60 percent for each afternoon, with aerial coverage becoming wide spread Wed/Thu. The increasing showers and storms will bring flooding potential, especially with multiple rounds of downpours over the same location. The hot temperatures continue with afternoon maxs in the low to mid 90s, along with heat indices reaching triple digits over much of SoFlo. Marine... High pressure situated across the western Atlantic waters will maintain light easterly to southeasterly surface flow and generally favorable marine conditions into the weekend. Isolated to scattered showers and storms can be expected across the Atlantic waters during the overnight and morning hours, transitioning to the Gulf waters during the late afternoon and early evening hours. The wind pattern will begin to shift Sunday with a southerly flow developing and then becoming southwesterly early next week. Sea breezes will still cause an onshore flow to develop most late morning and afternoons near the coasts. && .Preliminary Point Temps/PoPs... West Palm Beach 91 77 92 77 / 20 10 40 10 Fort Lauderdale 90 80 91 79 / 20 10 40 10 Miami 91 79 92 78 / 20 10 40 10 Naples 92 76 93 76 / 20 20 50 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && Update...09/Bhatti Aviation...09/Bhatti Marine...02/RAG Short Term...02/RAG Long Term...17/AR
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 1032 AM EDT Fri Aug 14 2020 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 150200- 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- 1032 AM EDT Fri Aug 14 2020 ...A FEW STRONG STORMS POSSIBLE TODAY OVER THE WESTERN INTERIOR... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Thunderstorms: Isolated to scattered thunderstorms are forecast midday into the early evening hours, with a focus across the interior and western portions of South Florida. Frequent lightning, strong wind gusts, and brief heavy downpours are the primary expected hazards. Waterspouts: Isolated waterspouts are possible across all local waters. Wind: Isolated thunderstorm wind gusts of 40 to 50 mph are possible, especially across the interior and western portions of South Florida during the afternoon hours. Flooding: Brief heavy downpours with showers and storms could lead to isolated flooding across vulnerable low-lying metro areas that have received heavy rainfall over the past several days, particularly across metro Collier County. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Scattered thunderstorms are forecast each afternoon into the early evening hours, with a focus across the interior and western portions of South Florida. Locally strong wind gusts, lightning, and localized flooding across urban and poorly drained areas from heavy rainfall are possible. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. For more information...visit the National Weather Service in Miami website at www.weather.gov/miami. SRB
The Miami radar (KAMX), 132 km away, was scanning. The volume nearest the first event began at 16:47 UTC.
1 funnel cloud. Local standard time, as filed.
Video received via social media of a funnel cloud in rural western Palm Beach County, roughly 9 miles NW of Lion Country Safari. Location is approximate based on radar data. No reports of damage received.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2020Every state in 2020This day in weather historyWarnings in Florida, August 2020
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: 911962.