A wake trough in trailing the departure of Hurricane Idalia lingering across NE FL. This feature combined with high tropical moisture, diurnal instability and the inland progressing west coast sea breeze produced localized heavy, flooding rainfall.
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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 wake trough in trailing the departure of Hurricane Idalia lingering across NE FL. This feature combined with high tropical moisture, diurnal instability and the inland progressing west coast sea breeze produced localized heavy, flooding rainfall.
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 Sep 1, 2:24 AM EST, 3 hours 51 minutes earlier.
Area Forecast Discussion
National Weather Service Jacksonville FL
324 AM EDT Fri Sep 1 2023
...DANGEROUS RIP CURRENTS THROUGH THE HOLIDAY WEEKEND...
...ISOLATED FLOODING POSSIBLE ALONG THE I-75 CORRIDOR THIS
AFTERNOON...
.NEAR TERM...(today and tonight)
A few areas of weak shower activity continue early this morning and
are being generated by a stalled frontal zone laying across
southeast GA and diffluent flow situated over the Suwannee Valley
region.
Today's weather will be driven by the stalled front which is poised
to accelerate southwestward toward the I-75 corridor today where
it will interact with the GOMEX sea breeze. Anticipate scattered
showers and isolated storms to develop across portions of SE GA
and NE FL as the front pushes southwestward. Increasing activity
and potential for strong convection will focus west of the HWY 301
corridor and likely along the I-75 corridor between 4-9pm. In
addition to the potential for a few strong gusts up to 50 mph,
isolated occurrences of flooding will be possible, especially
across saturated areas the western areas of the Suwannee Valley.
With the loss of heating and stable conditions behind the cool
front, convection will fade quickly after sundown.
As a result of the cool frontal passage, temps will be refreshingly
cool in most areas and trend a few degrees below normal. Highs
will hover in the low to mid 80s across SE GA and in the upper 80s
in NE FL and near 90 in north-central FL. Tranquil conditions are
anticipated overnight with lows near 70 across inland SE GA and
mid 70s for inland NE FL. Coastal areas will stay a bit warmer, in
the upper 70s, due to the onshore flow.
&&
.SHORT TERM...(Saturday through Monday)
A surface high pressure ridge will centered to the northeast on
Saturday, with a weak northwest to southeast oriented trough moving
west across area. The moist onshore flow, coupled with convergence
along this trough will yield chances for convection. The best chance
for convection will be across NE FL, as drier and more stable air
will work into interior SE GA under the high. Temperatures Saturday
will trend below normal, with highs rising into the mid 80s SE GA,
and mid to upper 80s NE FL.
The convection will dissipate late in the day Saturday with loss of
diurnal heating, with a dry night for Saturday night. Temperatures
Saturday night will continue to trend below normal as cooler and
drier air moves in with ridge.
For Sunday, the surface high pressure ridge to the northeast will
continue to build south across the area. The best chance for
convection will be across eastern NE FL, due to moist onshore flow
there. Otherwise, a good bit of sunshine will be expected, with
temperatures still a little below normal.
The high will continue to build south over the area Sunday night
into Monday, with mainly dry weather. A few thunderstorms will be
possible north central FL due to onshore flow and diurnal heating.
Due to the drier air in place, temperatures will be below normal
Sunday night, then heat up to around normal with sunshine on Monday.
&&
.LONG TERM...(Monday night through Thursday)
High pressure ridge will be over the area through Wednesday,
providing dry weather and temperatures slowly moderating back to
near to a little above normal.
The ridge will break down into Thursday, yielding better chances for
convection. Temperatures will moderate to above normal levels.
&&
.MARINE...
A stalled front laying across the southern Georgia waters will
shift inland today as high pressure to the northwest builds east
toward the eastern seaboard. Swells produced by the remnants of
Idalia and the breezy post frontal onshore flow will elevate seas
this afternoon. Hazardous seas for small craft will continue
offshore through Saturday night before winds diminish and seas
lower. High pressure will remain dominant through the weekend and
most of next week resulting in light winds and afternoon sea
breeze development.
Rip Currents: Breezy onshore winds and a moderate easterly swell
produced by the remnants of Idalia will build surf and create a
High Risk of rip current development today and through the
Memorial Day holiday weekend.
&&
.HYDROLOGY...
Heavy rain associated with thunderstorms this afternoon may lead
to localized areas of flooding, especially at locations that are
still saturated from rainfall associated with Hurricane Idalia.
Strengthening onshore flow will elevate tide along the Atlantic
coast and withing the lower St Johns River through at least
Saturday morning's high tide cycle. Minor flood impacts will be
possible along the Atlantic coast beginning with tonight's high
tide. Water levels between 1.5-2.5 above normally dry ground is
anticipated along the coast. A Coastal Flood Advisory is in
effect.
&&
.PRELIMINARY POINT TEMPS/POPS...
AMG 83 69 84 64 / 50 0 10 0
SSI 87 78 86 74 / 50 20 20 10
JAX 87 75 86 71 / 50 20 30 10
SGJ 87 78 86 74 / 50 20 40 10
GNV 88 74 87 70 / 80 70 40 0
OCF 90 73 88 70 / 80 70 40 10
&&
.JAX WATCHES/WARNINGS/ADVISORIES...
FL...High Rip Current Risk from 8 AM EDT this morning through late
Saturday night for FLZ124-125-133-138.
Coastal Flood Advisory from 9 PM this evening to 1 PM EDT
Saturday for FLZ124-125-133-138.
GA...High Rip Current Risk from 8 AM EDT this morning through late
Saturday night for GAZ154-166.
Coastal Flood Advisory from 9 PM this evening to 1 PM EDT
Saturday for GAZ154-166.
AM...Small Craft Advisory from 5 PM this afternoon to 4 AM EDT Sunday
for AMZ470-472-474.
&&The Jacksonville radar (KJAX), 56 km away, was scanning. The volume nearest the first event began at 11:13 UTC.
4 heavy rain, 1 flood, 1 flash flood. Local standard time, as filed.
A spotter measured 2 inches of rainfall in the past hour. Water was over roadways along Mud Lake Road, between State Road 121 and County Road 229.
A mesonet station measured 2.8 inches in the past hour.
A public weather station measured about 4. 5 inches since about 1:45 pm.
An observer measured 4.47 inches since 1:52 mph and observed flooding across the area.
Street flooding was observed near Main Street and the 500 block of 23rd Avenue.
Street flooding was first reported around 2:46 pm near Main Street and near the 500 block of 32rd Avenue in Gainesville. A mesonet station about 2 miles SE of Gainesville measured 2.8 inches of rainfall in one hour at 2:45 pm. At 3:14 pm, Fire Rescue reported flash flooding was developing along NW 23rd Avenue in Gainesville. At 3:16 pm, at public weather station measured around 4.5 inches of rainfall about 1 mile SE of Gainesville since 1:45 pm. At 3:35 pm, a CoCoRaHS station about 2 miles SE of Gainesville measured 4.47 inches since 1:52 pm which created flooding conditions. By 4 pm, the county 911 dispatch center reported several roads within about a 10 block radius in Gainesville experienced significant flash flooding. There were some road closures at the time of the report.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2023Every state in 2023This day in weather historyWarnings in Florida, September 2023
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: 1129982, 1129983, 1129984, 1129985, 1129981, 1129979.