Several reports of funnel clouds were reported along the Treasure Coast as the east coast sea breeze developed and moved inland early in the afternoon. A late afternoon collision of the east and west coast sea breezes along with other outflow boundaries led to the development of severe thunderstorms along the Interstate 4 corridor.
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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 MLB wrote it up.
Several reports of funnel clouds were reported along the Treasure Coast as the east coast sea breeze developed and moved inland early in the afternoon. A late afternoon collision of the east and west coast sea breezes along with other outflow boundaries led to the development of severe thunderstorms along the Interstate 4 corridor. These storms produced large hail and downed several trees near Mount Plymouth in Lake County and St. Cloud in Osceola County along with another report of a funnel cloud near Central Winds Park in Sanford.
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 Melbourne, FL wrote its last area forecast discussion before the first event at Jul 17, 8:31 AM EST, 4 hours 34 minutes earlier.
Area Forecast Discussion National Weather Service Melbourne FL 931 AM EDT Mon Jul 17 2017 .UPDATE... Today...Considerable convection was occurring offshore, apparently in association with weak upper trough shown in the RAP analysis. Water vapor showed slight drying aloft back over land, and the GOES 16 total precipitable water product showed some residual drier air over our northern areas and another pocket around Lake Okeechobee. Still, values are higher than recent days, so coverage of afternoon convection is expected to increase. The GFS has been very bullish with convection, but looks too much so as it generated an area of convection between 12 and 15z. The HRRR model was much more subdued but recently has shown an increase in late afternoon convection, especially across the north. Our forecast split the difference and showed a sharp increase in POPs compared to previous days, 40-60%, but not as high as MOS (50-80%). If HRRR trend continues, we may have to shift the orientation of likely POPs a bit. The drier pocket around Okeechobee may decrease coverage over southern coastal sections, while the HRRR is now indicating northern sections will have the greatest coverage. The morning soundings show rather typical lapse rates for mid July, but some drier air aloft should enhance downdrafts in afternoon storms, especially where the strong boundary interactions occur. Storm motion will be slow, mainly to the north, which will result in quick 2 inch downpours, but higher amounts to around 3 inches are possible. && .AVIATION... Increased moisture will produce a higher coverage of storms but recent short range models indicate the main activity holding off until after 18z, and possibly lingering a little after 00z. The greatest chance for strong storms appears to be at the interior terminals and eastward to KDAB and KTIX. && .MARINE... Today-Tonight...Broad Atlantic ridge is producing a southerly wind flow. Present and forecast speeds are 10 knots or less. Scattered morning showers/storms will diminish by early afternoon then additional activity developing over land may affect the coast. The latest indications are that areas from the Cape northward will have the highest chance for strong storms from late afternoon into evening. && .MLB WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. && FORECASTS...Lascody IMPACT WX...Bragaw
Hazardous Weather Outlook National Weather Service Melbourne FL 1120 AM EDT Mon Jul 17 2017 AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141- 144-147-180330- Flagler Beach to Volusia-Brevard County Line 0-20 nm-Volusia- Brevard County Line to Sebastian Inlet 0-20 nm- Sebastian Inlet to Jupiter Inlet 0-20 nm-Flagler Beach to Volusia- Brevard County Line 20-60 nm-Volusia- Brevard County Line to Sebastian Inlet 20-60 nm- Sebastian Inlet to Jupiter Inlet 20-60 nm-Inland Volusia County- Northern Lake County-Orange-Seminole-Southern Brevard County- Osceola-Indian River-Okeechobee-St. Lucie-Martin- Coastal Volusia County-Southern Lake County- Northern Brevard County- 1120 AM EDT Mon Jul 17 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA. .DAY ONE...THIS AFTERNOON AND TONIGHT. .THUNDERSTORM IMPACT... An increasingly moist southerly flow will lead to a higher coverage of lightning storms from mid afternoon through early evening. The east and west coast sea breezes will push inland with an expected collision along and east of the Florida Turnpike. The strongest activity is expected to develop along the I-4 Corridor between 5 PM and 8 PM and move north-northeast toward the Volusia and north Brevard county coasts. A few storms will become strong, containing winds gusts up to 50 mph, frequent lightning strikes, and very heavy rainfall. .FLOOD IMPACT... Local heavy rain up to 3 inches will cause temporary flooding of some roads and low lying areas. The highest threat for heavy rain will be along and north of the I-4 Corridor from late afternoon through early evening. .RIP CURRENT IMPACT... A small east swell will generate a moderate rip current threat along the beaches of east central Florida. Always swim within sight of a lifeguard. .MARINE THUNDERSTORM GUST IMPACT... Scattered to numerous lightning storms are expected to develop this afternoon and early evening as the east and west coast sea breeze boundaries push inland and collide over the east side of the peninsula. A few strong storms are expected over the interior counties that will affect some of the inland lakes. The storms will push back toward the Volusia and north Brevard county coasts toward sunset. Gusty winds of 35 to 40 knots and frequent lightning strikes will be the primary hazards. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. Scattered to numerous lightning storms are expected each afternoon. The primary threats will be dangerous cloud to ground lightning followed by gusty winds. Slow moving storms will also produce very heavy rains resulting in temporary flooding of some roads and poor drainage areas. An east swell will produce a moderate risk of rip currents at the beaches. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. Kelly/Bragaw
The Melbourne radar (KMLB), 125 km away, was scanning. The volume nearest the first event began at 18:06 UTC.
3 funnel cloud, 2 hail. Local standard time, as filed.
Local media relayed a report of a funnel cloud in the vicinity of Interstate 95 and SE Bridge Road near Hobe Sound.
St. Lucie County Emergency Management reported a funnel cloud over the County Fairgrounds.
A public report of quarter sized hail was received from a resident in Mount Plymouth near Chevy Chase Road. The report was relayed by local media.
Local media relayed video via social media of a funnel cloud near Central Winds Park in Winter Springs.
Quarter sized hail was reported near US-192 in St. Cloud via both social media and a storm spotter.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2017Every state in 2017This day in weather historyWarnings in Florida, July 2017
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: 700860, 700861, 700664, 700864, 700662.