Slow moving sea breeze convection over a moist airmass with precipitable water over 2 inches prompted locally heavy rainfall in 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.
Slow moving sea breeze convection over a moist airmass with precipitable water over 2 inches prompted locally heavy rainfall in 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 Jul 4, 1:20 PM EST, 23 minutes earlier.
Area Forecast Discussion
National Weather Service Jacksonville FL
220 PM EDT Thu Jul 4 2024
...New SHORT TERM, LONG TERM, MARINE...
.NEAR TERM...
Issued at 114 PM EDT Thu Jul 4 2024
For the latest NE FL and SE GA Daily Key Messages please visit:
https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf
The frontal boundary/surface trough is quickly becoming more
diffuse this afternoon and looking at radar and visible satellite
imagery the Atlantic Sea Breeze front is becoming active with
convection firing between the ocean and St Johns River/U.S. 301 in
GA. The Gulf sea breeze is still west of U.S. 19 and have delayed
activation of that boundary until later this evening. Have
tweaked the forecast to reflect the east coast convection slowly
moving inland and converging near I-75 later this evening.
&&
.SHORT TERM...
(Friday through Saturday night)
Issued at 214 PM EDT Thu Jul 4 2024
Drier air will filter into the coastal zones Friday and linger
through Saturday which will limit convection along the I-95 corridor
each afternoon and focus t'storms inland where abundant deep
moisture will exist. Light steering in place will allow sea
breezes to push in from both coasts, but the Atlantic sea breeze
will be a bit more dominant. Numerous showers and storms are
likely to focus between Highway 301 and the I-75 corridor each
afternoon and evening. A slow- moving front will drift in from the
northwest Saturday and become another focus for convective
activity. No supportive kinematics in place to favor much of any
severe threat either afternoon, but strong pulse storms between
outflow/cellular mergers may lead to brief, sub- severe
downbursts. With deep moisture entrenched across the area,
concerns with developing storms will be localized flooding due to
hefty rainfall rates (3-5" per hour) and slow movement.
Ridging aloft, which has been responsible for the heat wave across
portions of the Southern US, will build eastward and overhead into
the weekend resulting in slightly warming temps into the mid 90s and
heat index between 100-110F each afternoon. Heat Advisories will
need to be considered.
&&
.LONG TERM...(Sunday through next Thursday)
Issued at 214 PM EDT Thu Jul 4 2024
No signs of much considerable changes in this stagnant flow pattern
with ample moisture in place to fuel afternoon thunderstorms on the
sea breeze each day. A decaying boundary/trough axis will be in
place for the first couple of days next week and serve as focus for
storm development until it erodes by Wednesday. Another frontal
feature appears to work toward the area again by late next week. Hot
and humid conditions continue with no relief in sight as the strong
ridging aloft remains anchored over the area. Temps and heat index
values will stay above climo (average heat index is around 101F for
JAX) through the period with heat headlines possible each day.
&&
.MARINE...
Issued at 214 PM EDT Thu Jul 4 2024
A weakening frontal boundary will move southward and dissipate
over the local waters through the evening. Prevailing onshore
winds will continue as high pressure lingers off the eastern
seaboard. Storm coverage will decrease Friday through Saturday,
with the flow pattern shifting offshore direction during the
weekend. A slowing frontal boundary will approach the waters from
the north over the weekend and weaken across the waters next week.
Rip Currents: Given the enhanced risk on the Holiday, maintained
a high risk level for rip currents at NE FL beaches this
afternoon. Risk will be moderate Friday. At SE GA beaches, a
moderate risk continues.
&&
.CLIMATE...
Issued at 400 AM EDT Thu Jul 4 2024
Above average max/min temps expected through Saturday with the
record high mininim not too far off the forecast min temps
in the mid 70s.
July 5:
KGNV: 75/2023
July 6:
KJAX: 79/1902
KGNV: 78/1900
&&
.PRELIMINARY POINT TEMPS/POPS...
AMG 93 74 95 76 / 60 10 50 20
SSI 90 78 90 79 / 20 10 10 10
JAX 92 75 95 76 / 40 20 40 10
SGJ 91 77 91 77 / 20 20 30 10
GNV 92 73 93 74 / 60 60 70 10
OCF 93 75 93 75 / 60 50 80 20
&&
.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Heat Advisory until 6 PM EDT this evening for FLZ021-035-038-136-
137-140-220-236-237-240-340-522.
High Rip Current Risk through late tonight for FLZ124-125-133-
138.
GA...None.
AM...None.
&&The national radar mosaic for the moment the first event began.
2 heavy rain. Local standard time, as filed.
A public weather station BDWEATHERL - | KFLJACKS4273 measured 4.04 inches from | training storms. Rain began around 2:45 PM | EDT.
A public weather station N4AXX Radio SW - | KFLOCALA471 measured 4.61 inches from | training storms. Rain began around 4:50 PM | EDT.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2024Every state in 2024This day in weather historyWarnings in Florida, July 2024
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: 1192634, 1192635.