Special Weather Statement, NWS Jacksonville, FL

Area Forecast Discussion
National Weather Service Jacksonville FL
123 PM EDT Mon Jun 14 2021

.AVIATION...
[Through 18Z Tuesday]

Low stratus over the region this morning has eroded away. Earlier
start to convection late this morning, with this activity
expanding in coverage across northeast FL through the early
afternoon as the Atlantic sea breeze migrates inland. Heavy
t-storms will restrict vsbys and may produce gusty erratic
outflows as well. With chaotic outflows, winds may quickly shift
at times. Tonight, convection will wane through the evening with
VFR to MVFR ceilings developing overnight. Winds back to the south
southwest ahead of another approaching front which will stall
across the region on Tuesday.

&&

.PREV DISCUSSION [1007 AM EDT]...

.NEAR TERM [Through Tonight]...

Low stratus and fog across inland portions of southeast GA and the
northern Suwannee Valley may expand further eastward along the
Interstate 10 corridor towards sunrise. Overcast skies and fog
will then lift during the mid-morning hours. Otherwise, the
stationary frontal boundary extending southwestward from
developing low pressure near the Outer Banks will move slowly
southward and will dissipate this afternoon. The drier air mass
located just northwest of our region will begin to filter into
inland southeast GA this afternoon, while a loose local pressure
gradient and light west-southwesterly low level flow from the I-10
corridor southward will allow for the Atlantic and Gulf coast sea
breezes to develop and move inland, with these boundaries and the
decaying front all serving as convective triggers this afternoon.

Latest short-term, high resolution guidance indicates that
convection will ignite along the FL Big Bend and Nature coast late
this morning, with isolated convection developing across coastal
southeast GA and along the FL/GA border near the front. Outflow
and inland moving sea breeze boundaries should then collide for
locations along and south of I-10 this afternoon, with forecast
model soundings indicating deep tropical moisture persisting over
most of northeast and north central FL this afternoon, while PWAT
values decrease over inland southeast GA from north to south this
afternoon. Categorical POPs were placed in the forecast grids for
locations between I-95 and I-75, and slow/erratic storm motion
this afternoon will again raise the risk for localized flooding,
especially for urban and normally flood prone locations. Model
soundings also indicate ML CAPE values remaining in the relatively
tame 1,000 - 1,500 j/kg range today for locations south of
Waycross. Heavy rainfall amounts and frequent lightning strikes
will be the main threats this afternoon within this widespread
convective activity, mainly for locations south and east of
Waycross. The Weather Prediction Center has again placed these
locations within a Marginal Risk for Excessive Rainfall. Outflow
boundaries may spark widely scattered convection later this
afternoon for locations from Waycross northward. Highs will soar
to the lower 90s for these locations, while mid to upper 80s
prevail in the more tropical environment south and east of
Waycross.

Convective activity will quickly wane along the I-10 corridor
before sunset as the aforementioned drier air mass advects
southward, with widely scattered convection remaining possible
overnight over north central FL, where deeper moisture will
reside. Otherwise, the potent shortwave trough impacting the
eastern Great Lakes region today will dig a longwave trough over
the eastern third of the nation overnight, driving another frontal
boundary towards the Altamaha and Ocmulgee Rivers towards sunrise
on Tuesday. Our local pressure gradient will tighten overnight,
which should prevent fog formation for most locations, with a
light southwesterly breeze during the predawn hours keeping lows
in the low to mid 70s nearly area-wide.

.SHORT TERM [Tuesday Through Wednesday]...

A cold front from out of the north will settle in over the region
through midweek, with the front eventually stalling near the
Florida-Georgia border by midweek. Daily rounds of showers and
thunderstorms associated with diurnal heating are expected Tuesday
and Wednesday, with upper level troughing increasing the chances
for strong storm formations to occur on Tuesday due to increased
lift and cooling aloft. Drier air settling in over southeast
Georgia on Wednesday will act to inhibit convective
developments,making for areas outside of the frontal boundary,
primarily over northeastern Florida, more likely to experience
daytime convection. High temperatures for midweek will be in the
upper 80s and lower 90s with warmer temps expected to occur over
southeast Georgia and along the coast. Overnight low temperatures
will manage to drop down into the upper 60s by midweek for inland
areas due to drier air settling into the region.

.LONG TERM [Thursday Through Monday]...

Dry air over the region will begin to recede and weaken as high
pressure moves off to the east and low pressure from out of the
gulf develops into a trough west of the area, resulting in a more
southerly flow with an increase in moisture levels. Primarily
diurnal showers and storms throughout the area are expected to
continue through the end of the week and with build ups becoming
more widespread throughout the forecast area over the weekend as
the frontal boundary dissipates. Temperatures during this period
will be near the seasonal average.

.MARINE...

A stationary frontal boundary situated along the Florida and
Georgia border will weaken this afternoon, with numerous showers
and thunderstorms expected to develop over the northeast Florida
waters this afternoon to the south of this boundary. Seas of 2-3
feet will prevail both near shore and offshore today. Another
frontal boundary entering the southeastern states this morning
will also stall near the Florida and Georgia border by midweek.
Southwesterly winds will increase in advance of this frontal
boundary beginning late tonight, with Caution level wind speeds
of 15-20 knots expected on Tuesday night. Seas will briefly build
to 3-5 feet through Wednesday before diminishing by Wednesday
evening. Rounds of scattered thunderstorms will be possible on
Wednesday and Thursday for the northeast Florida waters. This
front will dissipate later this week as high pressure builds over
the southern Appalachians and low pressure takes shape over the
western Gulf of Mexico and moves northward. Lighter winds will
allow seas to fall to around 2 feet by late this week both near
shore and offshore.

Rip Currents: Low wave heights and developing offshore winds on
Tuesday will keep the risk low at area beaches through at least
midweek.

.FIRE WEATHER...

Light surface and transport winds will result in low daytime
dispersion values today for most of southeast GA and northeast FL.
Southwesterly surface and transport winds will keep dispersion
values above critically low values for north central FL. West to
west-southwesterly surface and transport winds will develop and
begin to strengthen overnight tonight, with breezy conditions
expected area-wide on Tuesday. This will create high dispersion
values across southeast GA, with good dispersion values forecast
across northeast and north central FL. A drier air mass will
filter into inland portions of southeast GA on Tuesday and
Wednesday, resulting in minimum relative humidity values of 30-35
percent both afternoons for locations north and west of Waycross.

.HYDROLOGY...

Slow moving thunderstorms this afternoon will likely result in
widespread 1-2 inch rainfall amounts for locations along and south
of the I-10 corridor, with locally higher totals possible.
Localized flooding will be possible this afternoon, especially
for urban and normally flood prone locations.

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  72  95  70  92  68 /  10  20  20  20  10
SSI  74  92  75  89  74 /  20  30  30  20  20
JAX  72  94  73  91  71 /  30  60  30  40  20
SGJ  72  93  73  89  72 /  40  70  20  40  20
GNV  72  90  73  88  71 /  30  60  40  50  20
OCF  72  89  74  88  72 /  40  30  30  40  30

&&

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

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Special Weather Statement
National Weather Service Jacksonville FL
205 PM EDT Mon Jun 14 2021

FLZ030-031-232-141845-
Western Clay FL-Union FL-Bradford FL-
205 PM EDT Mon Jun 14 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BRADFORD...EASTERN
UNION AND WEST CENTRAL CLAY COUNTIES UNTIL 245 PM EDT...

* At 204 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over Starke, moving northeast at 5
  mph.

* Small hail, winds in excess of 45 mph, and minor flooding due to
  heavy rainfall is possible with this storm.

* Locations impacted include...
  Starke, Sampson, Camp Blanding and Lawtey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 2988 8220 2996 8226 3014 8214 3014 8207
      3000 8194
TIME...MOT...LOC 1804Z 226DEG 5KT 2998 8214

KB

Special Weather Statement
National Weather Service Jacksonville FL
208 PM EDT Mon Jun 14 2021

FLZ033-038-133-138-141845-
Coastal Flagler FL-Coastal St. Johns FL-Inland Flagler FL-
Inland St. Johns FL-
208 PM EDT Mon Jun 14 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN FLAGLER AND
SOUTHEASTERN ST. JOHNS COUNTIES UNTIL 245 PM EDT...

* At 207 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over Crescent Beach, or 11 miles
  south of Saint Augustine, moving southeast at 5 mph.

* Small hail, excessive cloud-to-ground lightning, winds in excess of
  45 mph, and minor flooding due to heavy rainfall is possible with
  this storm.

* Locations impacted include...
  Saint Augustine Beach, Marineland, Crescent Beach, Saint Augustine
  Shores, Butler Beach and Dupont Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 2954 8115 2967 8138 2984 8130 2982 8120
      2960 8112
TIME...MOT...LOC 1807Z 293DEG 5KT 2973 8126

KB

Special Weather Statement
National Weather Service Jacksonville FL
215 PM EDT Mon Jun 14 2021

FLZ033-125-133-325-141900-
Coastal St. Johns FL-South Central Duval FL-Coastal Duval FL-
Inland St. Johns FL-
215 PM EDT Mon Jun 14 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL ST. JOHNS AND
SOUTHEASTERN DUVAL COUNTIES UNTIL 300 PM EDT...

* At 215 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over Bayard, or 7 miles south of
  Unf. This storm was nearly stationary.

* Penny size hail, wind gusts up to 50 mph, and minor flooding due to
  heavy rainfall is possible with this storm.

* Locations impacted include...
  Unf, Ponte Vedra Beach, Neptune Beach, Palm Valley, Sawgrass,
  Baymeadows, Nocatee, Bayard, Durbin and San Pablo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.

&&

LAT...LON 3006 8155 3023 8163 3035 8141 3012 8130
      3010 8130
TIME...MOT...LOC 1815Z 248DEG 4KT 3017 8152

KB