Prevailing WSW flow brought an early start to rainfall across NE Florida with heavy rainfall and frequent lightning strikes.
Every event with a place to put it. Tap one for its entry below.
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 JAX wrote it up.
Prevailing WSW flow brought an early start to rainfall across NE Florida with heavy rainfall and frequent lightning strikes.
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 Jacksonville, FL wrote its last area forecast discussion before the first event at Aug 18, 7:23 AM EST, 4 hours 3 minutes earlier.
Area Forecast Discussion National Weather Service Jacksonville FL 823 AM EDT Fri Aug 18 2017 .UPDATE... The region will be between high pressure to the Southeast, and a trough to the North Today. This will provide a general West to Southwest flow over NE FL into the afternoon, helping to keep the East coast sea breeze near the coast. With this flow moisture will increase from the gulf with convection spreading from Southwest to Northeast later this morning, with convection also developing along the East coast sea breeze. During the mid afternoon convection will spread over central portions of NE FL, then dissipating later in the afternoon. With a fairly light flow expected Today, localized heavy rainfall will be expected. A little drier flow over SE GA will limit convection there to a more isolated to scattered coverage. && .AVIATION... Convection is expected to develop this morning, with scattered to numerous convection through the afternoon. Brief restrictions in and near storms will be possible. && .PRELIMINARY POINT TEMPS/POPS... AMG 96 76 94 75 / 20 10 30 10 SSI 91 78 90 78 / 30 30 40 30 JAX 93 76 93 75 / 50 30 50 30 SGJ 91 77 91 75 / 50 30 30 30 GNV 91 74 92 74 / 70 30 40 30 OCF 91 74 93 74 / 70 20 30 10 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. && Struble
Hazardous Weather Outlook National Weather Service Jacksonville FL 300 AM EDT Fri Aug 18 2017 AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125- GAZ132>136-149>154-162>166-191000- Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM- Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM- Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM- Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM- Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM- Hamilton-Suwannee-Columbia-Baker-Inland Nassau-Inland Duval-Union- Bradford-Clay-St. Johns-Gilchrist-Alachua-Putnam-Flagler-Marion- Coastal Nassau-Coastal Duval-Coffee-Jeff Davis-Bacon-Appling- Wayne-Atkinson-Ware-Pierce-Brantley-Inland Glynn-Coastal Glynn- Echols-Clinch-Charlton-Inland Camden-Coastal Camden- 300 AM EDT Fri Aug 18 2017 ...HOT AND HUMID WITH HEAT INDICES NEAR 105 DEGREES TODAY... ...SLOW AND ERRATIC STORM MOTION WILL PROMOTE LOCALLY HEAVY RAINFALL THREAT THIS AFTERNOON AND EVENING... This Hazardous Weather Outlook is for Northeast Florida, Southeast Georgia and the Adjacent Coastal Waters. .DAY ONE...Today and Tonight... Heat Index values of 103 to 107 degrees are expected at many locations this afternoon. Scattered to Numerous afternoon and evening thunderstorms are expected today...mainly across Northeast Florida. A few strong thunderstorms will be possible with gusty winds and frequent lightning strikes. Slow and erratic storm motion is expected with locally heavy rainfall possible in the stronger storms from the I-10 corridor southward across Northeast Florida. .DAYS TWO THROUGH SEVEN...Saturday through Thursday... Scattered to numerous mainly afternoon and evening thunderstorms are expected Saturday. Scattered afternoon and evening thunderstorms will be possible at inland locations from Sunday through Thursday. A few strong thunderstorms will be possible each day, with gusty winds, frequent lightning strikes, and heavy downpours being the main threats. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. For additional information, visit the National Weather Service in Jacksonville website on the internet at weather.gov/jax.
The Jacksonville radar (KJAX), 32 km away, was scanning. The volume nearest the first event began at 16:25 UTC.
2 lightning, 2 heavy rain. Local standard time, as filed.
A lightning strike caused an apartment fire along Gate Parkway. Five people were displaced. The cost of damage was unknown, but it was estimated so the event could be included in Storm Data.
A house was struck by lightning along East Autumn Drive. The extent and cost of damage was unknown, but the cost was estimated so the event could be included in Storm Data.
A HAM radio operator measured 2.61 inches of rainfall within 3 hours along SE 137th Lane in Summerfield. There was widespread low area flooding across Belleview.
The public measured 2.5 inches of rainfall in 30 minutes.
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, August 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: 710006, 710007, 710003, 710000.