Areal Flood Warning 90, NWS Jacksonville, FL

Area Forecast Discussion
National Weather Service Jacksonville FL
333 PM EDT Tue Sep 21 2021

.Near Term.../through Wednesday/...

Numerous showers and thunderstorms this afternoon and evening, as a
trough of low pressure lays west to east across region, and the east
coast and gulf sea breezes move inland and collide. Heavy rainfall
will be possible with Todays activity, especially over central
counties where sea breeze boundaries intersect. With loss of diurnal
heating, chances will decrease overnight. Lows in the lower 70s are
expected.

A cold front will move southeast into SE GA Wednesday morning, then
slowly move southeast across forecast area Wednesday. Ample moisture
ahead of and along front, for rounds of showers with embedded
thunderstorms through the day. Highs Wednesday will be in the middle
to upper 80s.

&&

.Short Term.../Wednesday night through Saturday/...

The front will pass just to the southeast Wednesday night where it
will stall. The boundary will be stalled to the southeast through
this period, while it slowly weakens. High pressure will build from
the northwest through Thursday night, then more toward the north.
The proximity of the frontal boundary will keep moisture across
southeastern areas through Friday, while drier and cooler air filter
in from the northwest. Will include a chance for precipitation over
southeastern counties through Friday, but if the push of the cooler
and drier air is strong enough, could be dry across forecast area
through Friday. For Saturday, with the high to the north, onshore
flow will increase moisture, especially across NE FL where it will
already have not been as dry. So precipitation chances to increase
Saturday, especially for NE FL.

Temperatures will vary widely from NW to SE across forecast area
this period, as cooler and drier air filters south. For example,
Lows in the 50s will be common across SE GA Thursday night and
Friday night, while lows in the lower 70s will be common near the
NE FL coast.

&&

.Long Term.../Saturday night through Tuesday/...

High pressure will be centered to the north of the area this period.
This is expected to be a mainly dry period. The exception will be
south of Interstate 10, where onshore flow could provide enough
moisture for precipitation.

Highs will be fairly consistent this period with readings generally
getting into the middle 80s. Lows will still vary quite a bit
though, as onshore flow keeps readings up closer to the coast.

&&

.Marine...

A weak trough will linger across the region through Tonight, as a
surface high pressure ridge moves to the northeast. A cold front
will slowly move east southeast across area Wednesday into Wednesday
night. The boundary will stall just to the east southeast Thursday,
as high pressure builds to the northwest. The boundary will linger
to the east southeast into Saturday, as it dissipates. High pressure
will build over the weekend into next week.

Rip Currents: SE GA: Moderate Today, Low Wednesday
              NE FL: Moderate Today, Low Wednesday

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  71  87  60  79  56 /  60  60  30   0   0
SSI  74  85  66  82  67 /  30  60  40  10   0
JAX  73  88  67  84  63 /  60  60  40  10   0
SGJ  73  87  70  83  71 /  40  60  40  20  10
GNV  72  87  68  84  65 /  60  60  30  10   0
OCF  73  87  70  87  68 /  60  60  30  20  10

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...None.
&&

Special Weather Statement
National Weather Service Jacksonville FL
434 PM EDT Tue Sep 21 2021

FLZ033-125-132-133-325-212115-
Eastern Clay FL-Coastal St. Johns FL-South Central Duval FL-
Coastal Duval FL-Inland St. Johns FL-
434 PM EDT Tue Sep 21 2021

...A thunderstorm will impact portions of northwestern St.
Johns, northeastern Clay and southeastern Duval Counties through 515
PM EDT...

At 433 PM EDT, Doppler radar was tracking storms merging over
Switzerland, or over Fruit Cove. This storm was nearly stationary.

HAZARD...Minor flooding due to heavy rainfall.

SOURCE...Radar indicated.

IMPACT...Minor flooding due to heavy rainfall is possible.

Locations impacted include...
Green Cove Springs, Mandarin, Fruit Cove, World Golf Village,
Switzerland and Bayard.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2996 8144 2994 8166 3015 8171 3020 8149
TIME...MOT...LOC 2033Z 087DEG 4KT 3006 8162

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

CHANEY

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
436 PM EDT TUE SEP 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0400 PM     FLOOD            SAN MARCO               30.30N 81.66W
09/21/2021                   DUVAL              FL   BROADCAST MEDIA

            STREET FLOODING ALONG SAN MARCO BLVD, WATER
            NEARLY UP TO THE TOP OF CAR TIRES.

&&

DD

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
440 PM EDT TUE SEP 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0420 PM     FLOOD            SAN MARCO               30.31N 81.66W
09/21/2021                   DUVAL              FL   BROADCAST MEDIA

            STREET FLOODING ALONG LASALLE ST AND
            BELMONTE AVE.

&&

DD

Special Weather Statement
National Weather Service Jacksonville FL
447 PM EDT Tue Sep 21 2021

FLZ023-030-031-232-212130-
Baker FL-Western Clay FL-Union FL-Bradford FL-
447 PM EDT Tue Sep 21 2021

...Thunderstorms will impact portions of Bradford, southeastern
Baker, northeastern Union and southwestern Clay Counties through 530
PM EDT...

At 446 PM EDT, Doppler radar was tracking thunderstorms along a line
extending from 8 miles northeast of Raiford to near Kingsley.
Movement was southeast at 10 mph.

HAZARD...Minor flooding due to heavy rainfall.

SOURCE...Radar indicated.

IMPACT...Minor flooding due to heavy rainfall is possible.

Locations impacted include...
Starke, Keystone Heights, Raiford, Kingsley, Camp Blanding, Lawtey,
Hampton and Ellerbee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2978 8210 2981 8212 2982 8213 2983 8213
      2983 8214 2988 8217 2996 8221 3017 8230
      3021 8207 2983 8185
TIME...MOT...LOC 2046Z 326DEG 7KT 3014 8213 2994 8202

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

CHANEY

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