A mid to upper level was over the NE GOMEX with prevailing SW steering flow. 5 inches, which kept storm coverage lower than prior days, but also enhance DCAPE values due to dry air entrainment into storms.
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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 JAX wrote it up.
A mid to upper level was over the NE GOMEX with prevailing SW steering flow. Drier air was over the area compared to recent days with PWAT values 1.3-1.5 inches, which kept storm coverage lower than prior days, but also enhance DCAPE values due to dry air entrainment into storms.
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 Jun 17, 7:38 AM EST, 6 hours earlier.
Area Forecast Discussion National Weather Service Jacksonville FL 838 AM EDT Sat Jun 17 2017 .UPDATE...Early morning convection near the Gulf Coast region produced continue generally west of the I-75 corridor. An outflow boundary was tracking east across northeast Florida with some sprinkles or light shower within this convergence through 10 am as the line presses offshore. Elsewhere low stratus clouds were rapidly lifting with daytime heating. Upper level low pressure across the central Gulf Coast region will persist through the day bringing a prevailing SW steering flow across the area. A spoke of mid/upper level energy extended east of this upper level low and was assisting the generation of the early morning convection flirting across our western NE Florida zones. As the day progresses...this upper level support will pivot ENE across the forecast area under mean layer 1000-500 mb steering flow under a moist and unstable airmass. Precipitation will blossoming west-east through midday with diurnal heating and some upper level support...with an intrusion of drier mid/upper level air trailing the upper level trough axis. This will help to limit convective coverage somewhat compared to recent days...but could also enhanced downdraft momentum in tstorms that do develop. Thus a few strong to isolated severe storms capable of wet downbursts will be possible. Best chances of afternoon/evening showers and tstorms will focus between I-75 and the St. Johns River basin of NE Florida after 2 pm and across SE GA where sea breeze and outflow are expected to converge. Muggy conditions and near seasonal temperatures expected today with highs in the upper 80s across NE Florida to low 90s across SE GA. && .AVIATION...LIFR to IFR ceilings started to lift after sunrise into a MVFR deck. Conditions expected to improve to VFR by 15Z at all terminals. VCSH most likely near GNV this morning but will monitor Duval terminals with outflow boundary presses toward coast through 15-16Z. Light SSW winds will become onshore with sea breeze this afternoon. Continued with VCTS for all terminals this afternoon with convection fading this evening. At this time not a strong signal in the guidance for low stratus tonight. && .MARINE...SSW winds 10 kts or less will become onshore near coast this afternoon 10-15 kts. Combined seas generally 3 ft or less. Rip Currents: Moderate risk for NE Florida coast. && .HYDROLOGY...Black Creek at Penny Farms was at action stage as was Pottsburg Creek. If any locally heavy rainfall impacts these basins today expect river rises. && .PRELIMINARY POINT TEMPS/POPS... AMG 91 73 93 75 / 50 30 30 30 SSI 87 77 86 77 / 30 20 20 40 JAX 90 73 89 75 / 40 30 40 30 SGJ 87 74 87 74 / 30 20 30 20 GNV 88 72 90 73 / 40 30 60 40 OCF 88 73 90 74 / 40 30 60 30 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. && Enyedi/McGinnis
Hazardous Weather Outlook National Weather Service Jacksonville FL 243 AM EDT Sat Jun 17 2017 AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125- GAZ132>136-149>154-162>166-180645- 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- 243 AM EDT Sat Jun 17 2017 ...MODERATE RISK OF RIP CURRENTS AT NORTHEAST FLORIDA BEACHES... This Hazardous Weather Outlook is for Northeast Florida, Southeast Georgia and the Adjacent Coastal Waters. .DAY ONE...Today and Tonight... Isolated to scattered thunderstorms are expected today and this evening. Some storms may be strong and produce strong wind gusts, in addition to frequent lightning and locally heavy rain. There is a Moderate Risk of Rip Currents at the northeast Florida beaches today. .DAYS TWO THROUGH SEVEN...Sunday through Friday... Scattered to numerous afternoon and evening thunderstorms are expected through the period. The main thunderstorm hazards continue to be locally heavy rainfall, frequent lightning, and gusty winds. .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 Moody AFB radar (KVAX), 38 km away, was scanning. The volume nearest the first event began at 18:38 UTC.
7 thunderstorm wind, 1 lightning. Local standard time, as filed.
A tree was blown down at 152 Lake Alcyone. Cost of damage was estimated.
A tree was blown down at NW 26th Lane and NW 23rd Blvd. The cost of damage was estimated.
A tree was blown down at Highway 129 and Interstate 75. The cost of damage was estimated.
A tree was blown down on 5th Avenue SW in Jasper. The cost of damage was estimated.
A tree was blown down at 2680 SW 135 Road. The cost of damage was estimated.
A tree was blown down into power lines. The cost of damage was estimated.
Two trees were blown down in Fernandina Beach. One was blown down across a power line. The other was blown down across a road. The time of the events was based on radar.
Lightning hit a home which caused a home fire. The cost of damage was unknown, but it was estimated for the event to be included in Storm Data.
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, June 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: 707321, 707322, 707323, 707324, 707327, 707325, 707326, 707319.