Piney Bluff, Georgia Weather Forecast Discussion

966
FXUS62 KJAX 200014
AFDJAX
Area Forecast Discussion
National Weather Service Jacksonville FL
814 PM EDT Fri Sep 19 2025
...New UPDATE, AVIATION...
.KEY MESSAGES...
For the latest NE FL and SE GA Daily Key Messages please visit:
https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf
- Inland Fog Early Tomorrow Morning  Local Visibility < 1/2 mile
- Moderate Rip Current Risk Today  High Risk this Weekend
- Daily Isolated Thunderstorm Potential This Weekend: Coastal
  Northeast Florida to St. Johns River Basin
&&
.UPDATE...
Issued at 742 PM EDT Fri Sep 19 2025
Convection has overachieved a bit this afternoon and evening, and
some activity continues to hang on from near Baker County
southward towards the Gainesville area from lingering outflow
boundaries. A quick downpour and a few rumbles of thunder will be
possible in this general area through about 9pm before rapid
weakening is expected. Enough low level moisture is around for
patchy to areas of fog once again tonight, especially away from
the coast in GA and areas that received rainfall this afternoon where
some patchy visibilities under 1 mile will be likely. Lows range
from the mid to upper 60s inland to the low 70s by the coast and
St. Johns River.
&&
.NEAR TERM...
(Rest of Today through Tonight)
Issued at 215 PM EDT Fri Sep 19 2025
Weak low pressure troughing noted across parts of south GA and
high pressure ridge was located off SC and NC Carolina. PWAT data
shows values of about 1.3 to 1.5 inches across the region. A broad
mid level trough continues from GA to the FL Big Bend and into
the eastern Gulf with 500 mb temps of about -8C.
Models continue to suggest some isolated to possibly scattered
convection developing during the mid to late afternoon hours.
Indeed, radar data at 215 PM shows isolated convection over inland
southeast GA and Suwannee Valley area with movement southeast to
south about 5-10 mph. Thunder expected to begin shortly in Southeast
GA. MLCAPE values analyzed about 700-1100 J/kg. Convection expected
to continue until about 8-10 PM this evening and then fading. Later
tonight, patchy fog seems very probable again mainly inland areas
from southeast GA to the I-75 corridor and I-10 corridor of
northeast and north central FL. Lows are forecast in the mid to
upper 60s inland to the lower 70s at the coast.
&&
.SHORT TERM...
(Saturday through Sunday night)
Issued at 215 PM EDT Fri Sep 19 2025
Mostly dry conditions (PWATs ~1.5") continue for the upcoming
weekend as high pressure over the mid-Atlantic states begins to
stretch south along the eastern sea board by the later part of
weekend. With the high pressure and troughing along the western
Atlantic, the local pressure gradient will tighten a bit on
Saturday. Resulting in winds along the coast to range from 15 to
20 mph, with gusts potentially in the 20-25 mph range this
weekend. Chances of showers and storms increase along the coast as
the northeasterly flow continues to bring in moisture in from the
Atlantic. Any showers and storms will likely remain over the
local waters on Saturday, but won`t rule out the stray shower over
inland NE FL. Come Sunday, chances of showers and storms begin to
increase, but still sit at mostly the 20% range for coastal
locations and towards the US-301 corridor, with near 30% chance
for coastal locations along and south of St. Augustine.
Inland locations will rise into the upper 80s and lower 90s this
weekend. With the continuing onshore flow, coastal locations will
be on the cooler side as the cooler marine air will see
temperatures reach only into the mid to upper 80s.
&&
.LONG TERM...
(Monday through next Friday)
Issued at 215 PM EDT Fri Sep 19 2025
Northeasterly flow and dry air over inland locations during the
start of the upcoming week will keep chances of precipitation
primarily along coastal locations and inland NE FL. By Tuesday,
the overall flow will begin to shift to be more easterly to
southeasterly as the high pressure center north of the area is
expected to begin to move towards the east-northeast. This will
allow for a boundary to begin drift northward from south FL,
leading for an increase in tropical moisture northward towards NE
FL. Currently only have chances of precipitation in the 30% range
by midweek for most of NE FL, and into SE GA by the later half of
the week as models still differ in how far the boundary will shift
northward. By Thursday, guidance suggests a cold front will begin
to approach the area from the northwest, uncertainty still
remains with the placement and intensity of the associated
mid/upper level low over the central CONUS.
Temperature Highs will begin to warm to the lower 90s through
midweek, trending above normal towards midweek. Overnight lows
will continue to be low to mid 70s along the coast and north
central Florida, upper 60s over inland SE GA and the Suwannee
Valley Region of NE FL.
&&
.AVIATION...
(00Z TAFS)
Issued at 742 PM EDT Fri Sep 19 2025
Some convection is lingering inland, and a brief shower is
possible at GNV through about 01Z and cannot rule out a lightning
strike or two as well. Weakening is expected to begin soon
however, with the main concern at most airfields overnight being
FG potential. Have included reduced vsbys at all sites except CRG
and SGJ at this time, including TEMPOs for 1 mile vsby at GNV and
VQQ. It is possible for FG to drop vsby to 1/2SM or less inland
overnight, especially given rainfall that has occurred for some
areas this afternoon and evening. Continue to monitor overnight
for any forecast updates. Otherwise, Saturday expected to be a
drier day with only a slight chance of SHRA at SGJ, but not high
enough chance to put in the forecast at this time.
&&
.MARINE...
Issued at 215 PM EDT Fri Sep 19 2025
Winds are fairly light north to northeast at 5-10 kt and seas
about 2-4 ft. Northeast winds increase by tonight and continue
through the weekend as high pressure strengthens northeast of the
region and a coastal trough develops east of the Florida
peninsula. Winds and seas build this weekend with Small Craft
Exercise Caution conditions expected over the waters by Saturday.
The high and coastal trough weaken through mid-week next week,
relaxing the local gradient over the waters.
Rip Currents: Moderate risk continues rest of today, with
increasing northeast winds bringing a High risk this weekend to
area beaches. During the weekend, surf heights up to 2-4 ft are
expected at southeast GA beaches with 3-5 ft at northeast Florida
beaches and so below high surf advisory criterion.
&&
.HYDROLOGY...
Issued at 215 PM EDT Fri Sep 19 2025
Localized minor coastal flooding possible over the weekend as the
onshore flow continues and increases. Guidance showing extra-
tropical surge values of up to about 0.5 to 0.8 ft and given the
new moon could push values to around 1 and near 1.5 ft MHHW.
(Minor flooding criteria in the St Johns River Basin is about 1.5
ft MHHW). Along the immediate coast through the weekend, the
chance of meeting minor coastal flooding is low. Elevated water
levels will probably continue Mon to Wed, mainly in the St Johns
River basin, but looks like mainly in the low-end, about 1 to 1.5
ft MHHW. This event will not be as high as the prior 2 events
back around Sep. 9-10th and Sep. 13-14th, when peak water levels
were up to 1.8 to 2.3 ft MHHW.
&&
.PRELIMINARY POINT TEMPS/POPS...
AMG  65  90  64  89 /  20   0   0   0
SSI  71  84  71  83 /   0   0   0  10
JAX  69  88  69  88 /  10  10   0  20
SGJ  72  86  73  86 /  10  10  10  20
GNV  65  92  66  91 /  20  10   0  10
OCF  69  91  69  90 /  10  10   0  20
&&
.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...None.
&&
$$

NWS JAX Office Area Forecast Discussion