Special Weather Statement, NWS Jacksonville, FL

Area Forecast Discussion
National Weather Service Jacksonville FL
207 PM EDT Sun Aug 6 2017

.NEAR TERM /Tonight-Monday/...

Tonight...With Ridge axis drifting northward and drier air
slipping up the FL peninsula expect only isolated activity south
of a line from GNV to SGJ while deeper moisture with PWATS near 2
inches will still support scattered showers and storms from I-10
northward across SE GA through the evening hours with a few
strong storms with gusty winds, frequent lightning and heavy
rainfall as the storms move off to the NE at 10-15 mph. Activity
will fade across SE GA around midnight with partly cloudy skies
and muggy conditions overnight as temps fall into the lower to
middle 70s inland and upper 70s/near 80 along the river/coast.

Monday...As ridge axis lift northward into SE GA some drier
airmass will filter in aloft with PWATS dropping to 1.7 to 1.9
area-wide, but this will also allow for better daytime heating and
still enough atmospheric moisture to kick off isolated to
scattered showers/storms by the afternoon hours with storm
coverage generally in the 20-40% range with best coverage in
deepest moisture across SE GA although a secondary max is expected
across inland NE FL as Gulf/Atlc coast sea breeze fronts meet
later in the day. Although still slightly below climo coverage for
early August. A few storms may become strong with gusty winds,
lightning and locally heavy rainfall as mid level temps at 500mb
remain near climo around -6C. A bit better isolation should allow
for Max Temps to reach into the lower to middle 90s inland and
near 90 at the coast and expect afternoon heat indices
approaching 105 degrees once again.

.SHORT TERM /Monday night - Tuesday night/...

Monday night...The surface ridge will bisect the region near the
FL/GA line during the evening hours. The SE flow will prevail
around the southside of the Atlantic Ridge over Florida where
isold to scattered showers and thunderstorms will persist west of
highway 301 into the I-75 corridor through early to mid evening.
On the northside of the Atlantic ridge, steering winds over
southeast Georgia winds will be out of the southwest pushing
isold to scattered convection back eastward over the interior back
toward coastal SE Georgia during the bulk of the evening.
Isolated to scattered convection in the evening will dissipate
overnight into early Tue morning with lows in the mid 70s.

Tuesday and Tuesday night...Low level ridge will remain near or
nudge slightly north of the FL/GA border. This will allow for
strong Atlantic sea breeze in the afternoon pushing convection
further inland in the afternoon and evening. Soundings from NAM
and GFS show a more favorable thermodynamic profile for convection
Tuesday, specifically for inland SE GA. Will continue with higher
POPs in the that area as well as Suwanee Valley area around 50-70
percent, then lower elsewhere. Strong gusty winds and locally
heavy rain will be the primary concerns with storms in the
afternoon given elevated PWATS (2 to 2.25"), estimated SBCAPE of
2500-3000 J/kg and DCAPE between 850-1000 J/kg. Max temps fcst in
lower 90s most areas...a little lower along the coastal areas as
the sea breeze pushes inland. Convection should slowly fade
overnight with lows in the lower to mid 70s Tuesday night.

.LONG TERM /Wednesday-Saturday/...

.Wednesday...With the axis of the surface ridge north of the
Altamaha River Basin with wind flow being primarily from the SE
for most of the day. This will allow for ready inland transition
of the Atlantic afternoon sea breeze. The Atlantic seabreeze will
meet up with the Gulf seabreeze late afternoon near I-75 corridor.
Diurnally driven scattered to numerous showers and storms are
anticipated, with the better chances for interior locations
skewing toward the western portions west of highway 301 later in
the day.

.Thursday through Saturday...with a bit less convection on Thu as
drier air filters in from the southeast north of an upper level
ridge moving across srn FL. Sfc ridge begins to strengthen a bit
over the area Fri and Sat resulting in stronger southeasterly
flow. Adequate moisture remains with PWATs more than 1.7 inches
over the area and thus continued to forecast mainly scattered
diurnal showers and storms driven by sea breezes with best rain
chances over the inland areas. Temps will remain at or slightly
above normal.

&&

.AVIATION...
Still expect some scattered showers/storms to pop-up near JAX
metro TAF sites northward to SSI by 20z and will keep VCTS
through about 00z, otherwise expect VFR conds through tonight with
some lingering high clouds.

&&

.MARINE...
With Ridge axis to slide through the waters tonight and north of
the waters through much of this week. A general SE flow is
expected at 10-15 knots with seas 2-4 feet and local sea breezes
at the coast.

Rip Currents: Moderate Risk with some longer period swells at
times in the SE Flow.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  73  93  74  91 /  40  30  30  60
SSI  78  88  78  87 /  20  20  30  40
JAX  74  92  75  90 /  20  20  20  40
SGJ  77  89  78  88 /  10  20  10  30
GNV  73  92  74  91 /  10  30  30  40
OCF  75  92  75  91 /  10  30  30  30

&&

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

Hess/Cordero/McGinnis

Hazardous Weather Outlook
National Weather Service Jacksonville FL
328 AM EDT Sun Aug 6 2017

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-070830-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to
60 NM-
Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM-
Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM-
Hamilton-Suwannee-Columbia-Baker-Inland Nassau-Inland Duval-Union-
Bradford-Clay-St. Johns-Gilchrist-Alachua-Putnam-Flagler-Marion-
Coastal Nassau-Coastal Duval-Coffee-Jeff Davis-Bacon-Appling-
Wayne-Atkinson-Ware-Pierce-Brantley-Inland Glynn-Coastal Glynn-
Echols-Clinch-Charlton-Inland Camden-Coastal Camden-
328 AM EDT Sun Aug 6 2017

...MODERATE RISK OF RIP CURRENTS AT NORTHEAST FLORIDA BEACHES...

This Hazardous Weather Outlook is for Northeast Florida,
Southeast Georgia and the Adjacent Coastal Waters.

.DAY ONE...This Afternoon and Tonight...

Scattered thunderstorms are expected to develop during the
mid to late afternoon mainly from near the I-10 corridor
north into southeast Georgia. A few storms may become strong
and produce strong and gusty winds in addition to frequent
lightning and locally heavy rain.

There is a Moderate Risk of rip currents at the northeast
Florida beaches due to a lingering long period swell.

A River Flood warning is in effect for the St. Marys River at
Macclenny where minor flooding will occur.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

Scattered mainly afternoon and evening thunderstorms are expected
each day. A few strong storms will be possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected to be needed at this time.

For additional information, visit the National Weather Service in
Jacksonville website on the internet at weather.gov/jax.

Special Weather Statement
National Weather Service Jacksonville FL
552 PM EDT SUN AUG 6 2017

FLZ024-025-062215-
Inland Duval FL-Inland Nassau FL-
552 PM EDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NASSAU AND WEST
CENTRAL DUVAL COUNTIES UNTIL 615 PM EDT...

At 552 PM EDT, Doppler radar was tracking a strong thunderstorm over
Cisco Gardens, or 9 miles west of Jacksonville, moving north at 15
mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Cisco Gardens, Ortega, Normandy, Bryceville, Baldwin and Whitehouse
Air Field.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3026 8170 3025 8200 3044 8199 3044 8167
TIME...MOT...LOC 2152Z 181DEG 13KT 3035 8181

ELSENHEIMER

Special Weather Statement
National Weather Service Jacksonville FL
556 PM EDT SUN AUG 6 2017

FLZ022-030-031-062230-
Columbia FL-Union FL-Bradford FL-
556 PM EDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN BRADFORD...UNION AND
SOUTHEASTERN COLUMBIA COUNTIES UNTIL 630 PM EDT...

At 556 PM EDT, Doppler radar was tracking a strong thunderstorm over
Worthington Springs, or over Worthington Spring, moving north at 15
mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Lake Butler, Worthington Spring, Worthington Springs, Palestine
Community, Upland Pines, Groves, Providence, Watertown, Lulu and
Dukes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3020 8246 3014 8246 3014 8231 2988 8236
      2989 8239 2992 8241 2993 8245 2993 8247
      2994 8248 2994 8252 2992 8254 2993 8255
      2992 8258 3020 8261
TIME...MOT...LOC 2156Z 181DEG 13KT 2994 8247

ELSENHEIMER

Special Weather Statement
National Weather Service Jacksonville FL
615 PM EDT SUN AUG 6 2017

FLZ024-025-062245-
Inland Duval FL-Inland Nassau FL-
615 PM EDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NASSAU AND CENTRAL
DUVAL COUNTIES UNTIL 645 PM EDT...

At 615 PM EDT, Doppler radar was tracking a strong thunderstorm near
Bryceville, or 9 miles south of Callahan, moving north at 10 mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Callahan, Jacksonville International Arpt, Cisco Gardens, Nassau
Village-Ratliff, Ratliff, Bryceville and Whitehouse Air Field.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3043 8168 3032 8172 3033 8199 3042 8203
      3045 8203 3046 8202 3046 8203 3047 8202
      3056 8201 3059 8201 3056 8167
TIME...MOT...LOC 2215Z 171DEG 10KT 3042 8187

ELSENHEIMER

Special Weather Statement
National Weather Service Jacksonville FL
645 PM EDT SUN AUG 6 2017

FLZ022-023-030-062330-
Columbia FL-Baker FL-Union FL-
645 PM EDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BAKER...NORTH
CENTRAL UNION AND CENTRAL COLUMBIA COUNTIES UNTIL 730 PM EDT...

At 645 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Sanderson to Watertown. Movement was
northwest at 15 mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Lake City, Five Points, Watertown, Winfield, Suwannee Valley, Olustee
and Sanderson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3034 8268 3040 8265 3044 8266 3042 8222
      3014 8217 3014 8245 3013 8246 3011 8246
      3011 8265 3026 8280 3027 8279
TIME...MOT...LOC 2245Z 148DEG 15KT 3018 8229 3018 8261

ELSENHEIMER

Special Weather Statement
National Weather Service Jacksonville FL
659 PM EDT SUN AUG 6 2017

FLZ024-062345-
Inland Nassau FL-
659 PM EDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN NASSAU COUNTY UNTIL
745 PM EDT...

At 659 PM EDT, Doppler radar was tracking a strong thunderstorm over
Hilliard, moving northwest at 10 mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Hilliard and Kings Ferry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3059 8194 3066 8205 3071 8204 3075 8204
      3076 8201 3079 8202 3077 8198 3083 8195
      3081 8191 3082 8189 3079 8187 3079 8179
      3076 8178 3076 8177 3078 8177 3066 8174
TIME...MOT...LOC 2259Z 148DEG 10KT 3068 8190

ELSENHEIMER

Special Weather Statement
National Weather Service Jacksonville FL
718 PM EDT SUN AUG 6 2017

FLZ023-024-GAZ164-062345-
Baker FL-Inland Nassau FL-Charlton GA-
718 PM EDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NASSAU...NORTHERN
BAKER AND SOUTH CENTRAL CHARLTON COUNTIES UNTIL 745 PM EDT...

At 718 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles southwest of Taylor to near Macclenny.
Movement was north at 20 mph.

Wind gusts of 45 to 55 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Taylor, Macclenny, St. George and Bryceville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3037 8194 3026 8205 3035 8242 3041 8246
      3052 8246 3058 8245 3057 8222 3052 8187
TIME...MOT...LOC 2318Z 180DEG 15KT 3039 8240 3030 8206

ELSENHEIMER