A broad mean layer trough was across the local area. A strongest westerly flow focused the afternoon and evening sea breeze and outflow collision along and east of the St.
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.
A broad mean layer trough was across the local area. A strongest westerly flow focused the afternoon and evening sea breeze and outflow collision along and east of the St. Johns River basin in the evening where isolated severe storms formed and produced wet downbursts.
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 Jul 3, 1:40 PM EST, 4 hours 20 minutes earlier.
Area Forecast Discussion National Weather Service Jacksonville FL 240 PM EDT Mon Jul 3 2017 ...Hot and Humid with Heat Indices around 105 degrees and Scattered afternoon/evening storms through Thursday... .NEAR TERM /through Tuesday/... Maintaining an hourly POP/weather evolution fairly close to general HRRR trend...with 2 areas of precipitation focus...1st over eastern counties of SE GA ahead of 700mb shortwave...and 2nd over our southern counties where multiple boundaries exist and where east coast sea breeze more likely to make some progress inland...along with existence of high precipitable water axis per GOES-16 derived imagery. Soundings show decent D-CAPE and differential theta-e values that suggest potential for cold downdrafts that could yield strong gusty winds from strongest storms. May be a relative min of convection along I-10 corridor north of deep moisture axis yet south of 700mb shortwave. Muggy low temps in mid 70s. For July 4th...Hot muggy day expected...with model low-level thickness values a little higher than today...supports mid 90s inland with some areas seeing upr 90s...heat index values 100-105...with high temps around 90 immediate coast. Models suggest lesser coverage of afternoon convection compared to past few days...best chance over our southern counties...with 20-30 POPs further north. .SHORT TERM /Tuesday Night through Thursday/... East to West Oriented Weak High pressure ridge remains in place at the surface and aloft from the Northern GOMEX across the Florida Peninsula and into the Wrn Atlantic. This will continue very light steering flow out of the S or SW. Airmass will remain moist enough to support isolated to scattered storms each day with PWATS in the 1.6 to 1.8 range. The slightly less coverage of storms each day than normal will allow for Max Temps to reach well into the middle 90s inland and even a few upper 90s are possible. Max Temps closer to 90 and lower 90s near the coast as weak sea breezes push slowly inland each day. This will support daily heat indices around 105 degrees during the afternoon hours. .LONG TERM /Friday through Monday/... Ridge breaks down slightly Fri/Sat as trof/old frontal boundary moisture tracks into the SE U.S. and this increase in moisture will slowly bring back more scattered to numerous shower/storm activity over the weekend which will linger into early next week. This will also allow for Max Temps to slip closer to normal with highs in the lower/middle 90s inland and upper 80s/near 90 at the coast with Heat Indices in the 100-105 range. Temps aloft may cool closer to -8/-9C at 500 mb and allow for better coverage of strong to isolated Severe Storms with wet microburst/downburst potential increasing slightly. && .AVIATION...Generally VFR conditions expected...except lower conditions associated with scattered afternoon SHRA/TSRA. Greatest coverage anticipated to be 20z-00z period over north-central FL and eastern counties of se GA. Included TEMPO group for this period at KSSI...KGNV...and KSGJ... with just VCTS JAX areas TAF sites where lesser coverage anticipated. && .MARINE...Surface ridge of high pressure will remain just S of our waters...maintaining southerly 10-15kt winds and 2-4ft seas through the week. .Rip Currents...Swells are expected to continue to be minimal the next couple of days so have continued to go with a low risk. However...rip currents may be briefly enhanced in typical threat areas...by piers...particularly during afternoon sea breezes. && .PRELIMINARY POINT TEMPS/POPS... AMG 74 96 74 97 / 20 20 10 30 SSI 77 91 79 92 / 40 30 10 30 JAX 75 94 75 95 / 30 30 10 40 SGJ 76 91 76 91 / 30 30 10 20 GNV 74 95 73 95 / 20 50 10 50 OCF 74 94 73 94 / 20 50 20 50 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. && Wolf/Hess/McGinnis
Hazardous Weather Outlook National Weather Service Jacksonville FL 336 AM EDT Mon Ju1 3 2017 AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125- GAZ132>136-149>154-162>166-040900- 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- 336 AM EDT Mon Jul 3 2017 ...AFTERNOON HEAT INDICES NEAR 105 DEGREES... This Hazardous Weather Outlook is for Northeast Florida, Southeast Georgia and the Adjacent Coastal Waters. .DAY ONE...Today and Tonight... Scattered thunderstorms will develop this afternoon with best coverage of storms west of I-95 and across southeast Georgia in the afternoon into the early evening. Some storms may be strong and produce gusty winds and frequent lightning in addition to locally heavy rain. Prior to showers and storms...high temperatures in the lower to mid 90s combined with the humidity will produce heat indices near 105 degrees. Scattered showers and thunderstorms will linger near the Atlantic coast this evening...with a gradual decrease in coverage and intensity through midnight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... Scattered to numerous showers and thunderstorms are expected each day mainly in the afternoon and evening. Locally heavy rainfall...gusty winds...and frequent lightning will be possible in the strongest thunderstorms. High temperatures in the lower to mid 90s combined with the humidity will create heat index values 100 to 105 degree. .SPOTTER INFORMATION STATEMENT... Spotter activation is not needed at this time. For additional information, visit the National Weather Service in Jacksonville website on the internet at weather.gov/jax.
Special Weather Statement
National Weather Service Jacksonville FL
420 PM EDT MON JUL 3 2017
FLZ125-032045-
Coastal Duval FL-
420 PM EDT MON JUL 3 2017
...SIGNIFICANT WEATHER ADVISORY FOR EASTERN DUVAL COUNTY UNTIL 445 PM
EDT...
At 420 PM EDT, Doppler radar was tracking a strong thunderstorm over
Neptune Beach, or over Ponte Vedra Beach, moving east at 10 mph.
Excessive cloud-to-ground lightning and Wind gusts of 45 to 55 mph
can be expected along with possible minor damage.
Locations impacted include...
Neptune Beach.
LAT...LON 3023 8136 3024 8138 3025 8138 3025 8139
3027 8142 3035 8140 3033 8136 3028 8135
3025 8134 3024 8134
TIME...MOT...LOC 2020Z 278DEG 11KT 3028 8138
ELSENHEIMERSpecial Weather Statement
National Weather Service Jacksonville FL
447 PM EDT MON JUL 3 2017
FLZ033-125-032115-
St. Johns FL-Coastal Duval FL-
447 PM EDT MON JUL 3 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN ST. JOHNS AND EAST
CENTRAL DUVAL COUNTIES UNTIL 515 PM EDT...
At 446 PM EDT, Doppler radar was tracking a strong thunderstorm over
San Pablo, or near Unf. This storm was nearly stationary.
Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.
Locations impacted include...
Unf, Ponte Vedra Beach, Neptune Beach, San Pablo and Craig Field.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3023 8155 3037 8156 3037 8136 3036 8136
3023 8135
TIME...MOT...LOC 2046Z 104DEG 1KT 3028 8146
ELSENHEIMERSpecial Weather Statement
National Weather Service Jacksonville FL
515 PM EDT MON JUL 3 2017
FLZ033-032145-
St. Johns FL-
515 PM EDT MON JUL 3 2017
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ST. JOHNS COUNTY UNTIL
545 PM EDT...
At 515 PM EDT, Doppler radar was tracking a strong thunderstorm over
World Golf Village, or 10 miles southeast of Fruit Cove, moving east
at 10 mph.
Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.
Locations impacted include...
World Golf Village, Nocatee, South Ponte Vedra, Guana River State
Park and Vilano Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 2990 8148 3004 8149 3010 8145 3016 8132
2996 8125
TIME...MOT...LOC 2115Z 265DEG 8KT 3003 8146
ELSENHEIMERPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
525 PM EDT MON JUL 03 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0505 PM TSTM WND GST 3 W JACKSONVILLE BEACH 30.28N 81.44W
07/03/2017 M43 MPH DUVAL FL MESONET
A WIND GUST OF 43 MPH WAS MEASURED AT THE JAX BEACH PIER.
&&
SHULERSpecial Weather Statement
National Weather Service Jacksonville FL
530 PM EDT MON JUL 3 2017
FLZ037-040-032200-
Putnam FL-Marion FL-
530 PM EDT MON JUL 3 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN PUTNAM AND NORTHEASTERN
MARION COUNTIES UNTIL 600 PM EDT...
At 530 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Orange Springs to near Salt Springs. Movement
was north at 10 mph.
Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.
Locations impacted include...
Interlachen, Salt Springs, Lake Delancy, Melrose Landing, Fruitland,
Orange Springs, Hollister, Welaka, Hog Valley and Johnson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 2939 8191 2947 8206 2961 8206 2973 8202
2974 8199 2946 8156 2933 8166 2932 8168
TIME...MOT...LOC 2130Z 193DEG 8KT 2952 8196 2938 8174
ELSENHEIMERSpecial Weather Statement
National Weather Service Jacksonville FL
618 PM EDT MON JUL 3 2017
FLZ033-032245-
St. Johns FL-
618 PM EDT MON JUL 3 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN ST. JOHNS COUNTY UNTIL
645 PM EDT...
At 617 PM EDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Saint Augustine, moving east at 10 mph.
Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.
Locations impacted include...
Saint Augustine, Saint Augustine Beach, Saint Augustine Shores,
Butler Beach, Vilano Beach, Saint Augustine South, Anastasia,
Bakersville, Dupont Center and Elkton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 2976 8120 2974 8153 2976 8153 2979 8156
2985 8159 2996 8147 3002 8128
TIME...MOT...LOC 2217Z 255DEG 7KT 2985 8145
ELSENHEIMERThe Jacksonville radar (KJAX), 80 km away, was scanning. The volume nearest the first event began at 22:58 UTC.
3 thunderstorm wind. Local standard time, as filed.
A power line was blown down on County Road 207, just west of Interstate 95.
Small trees were blown down and numerous medium sized branches were snapped off of trees.
A power company truck was damaged by a tree limb that was blown down.
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: 707451, 707452, 707453.