Severe Thunderstorm Warning 247, NWS Jacksonville, FL

Area Forecast Discussion
National Weather Service Jacksonville FL
919 AM EDT Wed Aug 9 2017

.UPDATE...
A weak frontal boundary was located across southeast Georgia this
morning, and significant low stratus and mid level clouds were
located along/north of I-10. There was also some patchy fog, but
that was lifting quickly this morning. The 12Z sounding showed
high moisture remaining over the region with precipitable water
values near 2.2 inches. Temperatures aloft warmed slightly, and
winds above the surface have veered more westerly compared to
this time yesterday. This should steer storms to the east
northeast around 10 mph this afternoon. Hi-res guidance indicates
that showers and storms should begin developing in the early
afternoon, and then becoming numerous across the region by mid to
late afternoon and continuing into the evening. Locally heavy
rainfall is the main threat and, with saturated conditions,
flooding and ponding on roadways is likely. Dry pockets aloft have
led to high DCAPE values greater than 1000 J/kg, which may lead
to strong to isolated severe downbursts late this afternoon. Cloud
cover this morning should lead to lower high temperatures than
yesterday, with highs in the mid 80s to lower 90s.

&&

.AVIATION...
Low cigs and patchy fog from the overnight hours has lifted, with
some MVFR cigs remaining at KSSI. Mainly VFR conditions are
expected outside of showers and storms this afternoon into the
early evening, with restrictions expected. Light winds this
morning will become easterly around 10 knots this afternoon as the
east coast sea breeze moves inland. Light winds are expected
overnight again.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  88  74  90  74 /  60  30  40  40
SSI  86  77  86  77 /  60  30  40  20
JAX  90  75  89  75 /  70  40  40  20
SGJ  90  75  87  76 /  60  30  20  10
GNV  91  73  91  74 /  70  60  40  30
OCF  93  74  92  74 /  60  40  40  30

&&

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

Kennedy/Zibura/Corless

Hazardous Weather Outlook
National Weather Service Jacksonville FL
511 AM EDT Wed Aug 9 2017

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-100915-
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-
511 AM EDT Wed Aug 9 2017

...STRONG THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EARLY EVENING WITH
LOCALLY HEAVY RAIN AND GUSTY WINDS...
...MODERATE RISK OF RIP CURRENTS AT AREA BEACHES...

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

.DAY ONE...Today and Tonight...

Patchy fog is expected early this morning mainly north of Interstate
10 and west of Interstate 95. Local visibilities below 1 mile
expected through about 8 am.

Scattered to numerous thunderstorms are expected to develop
during the afternoon and early evening mainly...with highest
chances near and west of Highway 301. A few storms may become
strong and produce strong gusty winds in addition to frequent
lightning. Locally heavy rainfall may cause temporary flooding in
low lying areas.

There is a Moderate Risk of rip currents at the northeast
Florida beaches due to easterly swells.

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

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

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

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed. However, spotters are
encouraged to report heavy rainfall amounts or flooding to the
National Weather Service.

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
145 PM EDT WED AUG 9 2017

FLZ037-091815-
Putnam FL-
145 PM EDT WED AUG 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PUTNAM COUNTY UNTIL
215 PM EDT...

At 144 PM EDT, Doppler radar was tracking a strong thunderstorm over
Interlachen. This storm was nearly stationary.

Wind gusts of 35 to 50 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Interlachen, Melrose Landing, Hollister and Mannville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2964 8199 2973 8192 2967 8173 2955 8183
TIME...MOT...LOC 1744Z 301DEG 4KT 2966 8189

ENYEDI

Special Weather Statement
National Weather Service Jacksonville FL
213 PM EDT WED AUG 9 2017

FLZ037-091845-
Putnam FL-
213 PM EDT WED AUG 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PUTNAM COUNTY UNTIL 245
PM EDT...

At 213 PM EDT, Doppler radar was tracking a strong thunderstorm over
Hollister, or 7 miles east of Interlachen, moving east at 15 mph.

Wind gusts of 35 to 50 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Palatka, Interlachen, Hollister and Mannville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 2960 8193 2970 8181 2965 8163 2951 8177
TIME...MOT...LOC 1813Z 291DEG 11KT 2961 8178

ENYEDI

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Special Weather Statement
National Weather Service Jacksonville FL
237 PM EDT WED AUG 9 2017

FLZ040-091915-
Marion FL-
237 PM EDT WED AUG 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL MARION COUNTY UNTIL
315 PM EDT...

At 237 PM EDT, Doppler radar was tracking a strong thunderstorm near
Rainbow Lakes Estates. This storm was nearly stationary.

Wind gusts of 35 to 50 mph can be expected along with possible minor
wind damage.

Locations impacted include...
Rainbow Lakes Estates and Romeo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2921 8254 2922 8240 2929 8241 2931 8235
      2912 8235 2909 8253
TIME...MOT...LOC 1837Z 269DEG 4KT 2918 8249

ENYEDI

Special Weather Statement
National Weather Service Jacksonville FL
241 PM EDT WED AUG 9 2017

FLZ032-091915-
Clay FL-
241 PM EDT WED AUG 9 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CLAY COUNTY UNTIL 315 PM
EDT...

At 240 PM EDT, Doppler radar was tracking a strong thunderstorm near
Middleburg, moving northeast at 5 mph.

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

Locations impacted include...
Penney Farms and Asbury Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2990 8184 2996 8194 3005 8185 3000 8173
TIME...MOT...LOC 1840Z 221DEG 4KT 2996 8186

ENYEDI