Severe Thunderstorm Warning 146, NWS Jacksonville, FL

439 
WWUS52 KJAX 022009
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
409 PM EDT Mon Aug 2 2021

FLC003-089-GAC049-022019-
/O.CAN.KJAX.SV.W.0146.000000T0000Z-210802T2030Z/
Nassau FL-Baker FL-Charlton GA-
409 PM EDT Mon Aug 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NASSAU...CENTRAL
BAKER AND SOUTH CENTRAL CHARLTON COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 3027 8205 3029 8232 3048 8236 3051 8202
      3033 8198
TIME...MOT...LOC 2007Z 267DEG 13KT 3039 8219 

$$

23

Area Forecast Discussion
National Weather Service Jacksonville FL
325 PM EDT Mon Aug 2 2021

.NEAR TERM [Through Tonight]...

A cold frontal boundary will stall to the north of the area today.
The 12Z sounding this morning showed deep west to northwest flow
throughout the column. Deep moisture was prevalent as well, with
precipitable water values near 2 inches. So far today, convective
activity has been mainly focused across northeast Florida south of
I-10 as the Gulf coast seabreeze has been making its way inland.
We are over the last hour or so starting to finally see storms
bubble up south of the slowly moving front. This activity will
continue to spread across the entire region, lasting well into
the overnight hours before dissipating. Locally heavy rainfall and
flooding will be the biggest threats from storms today, with the
heaviest rainfall likely across southeast Georgia. 1-2 inches of
rain with locally higher amounts are expected across southeast
Georgia. Much of southeast Georgia has been below normal for
rainfall over the past week, so will hold off on any flood watches
for now. The delayed start to convection will lead to hot
temperatures today, with highs generally in the low to mid 90s.
Heat indices will be 103-108F.

.SHORT TERM [Tuesday Through Wednesday Night]...

The front will stall near/north of the Altamaha River overnight,
and remain quasi-stationary to our north for the next couple of
days. Our area will remain in the warm, humid airmass south of
this frontal boundary, so numerous to widespread showers and
thunderstorms are anticipated Tuesday and Wednesday, with storms
starting to develop near the Gulf coast in the morning, spreading
across the area through the afternoon hours and lingering into
the evening hours. With heavy cloud cover and enhanced coverage of
storms Tuesday and Wednesday, daytime temperatures will only peak
in the low to mid 80s, upper 80s along the Northeast Florida
coastline and near Ocala. Lows will be in the low to mid 70s.

.LONG TERM [Thursday Through Monday]...

Low level flow will be mostly from the southwest still through
the period, with a ribbon of 2+ inch PWATs hanging over the region
and a series of short wave troughs ejecting through the broad
upper trough to our north. This should support the development of
numerous to widespread showers through at least Saturday. As we
head into next week, the upper level trough should lift
northeastward as ridging nudges westward towards us, allowing PoPs
and temps to trend closer to normal.

&&

.AVIATION...
[Through 18Z Tuesday]

Numerous to widespread showers and storms will impact the TAF
sites this afternoon and into the overnight hours. Showers/storms
will then move quickly in from the Gulf on Tuesday, impacting the
TAF sites in the morning hours. Restrictions are expected
in/around showers/storms. Southwest winds will prevail this
afternoon, except for a weak east coast sea breeze at the coastal
TAF sites. Light winds are expected overnight, and southwest winds
5-10 knots are then expected through the end of the TAF period.

&&

.MARINE...

A weak frontal boundary will slowly sink south towards our Georgia
coastal waters tonight and remain stalled near our area for the
next several days. South of this boundary, we will see mostly
west-southwest winds around 10 to 15 knots with 2 to 3 foot seas
and daily chances for showers and thunderstorms.

Rip Currents: Offshore flow will continue a low risk of rip
currents at the Atlantic Beaches of NE FL/SE GA.

&&

.FIRE WEATHER...

A weak, quasi-stationary frontal boundary is draped across central
Georgia today and will slowly sink south over the next couple days.
Weak winds in place along/near that boundary over southeast Georgia
will lead to low daytime dispersions. Other than that, the area
will stay in the warm, moist airmass south of the boundary, keeping
RH well above critical thresholds and preventing any red flag
conditions from developing.

&&

.HYDROLOGY...

Widespread rainfall totals of 3-6 inches this week will likely
produce main stem river flooding across basins in SE GA and will
exacerbate river flooding already ongoing across NE FL basins
including having to keep a close eye on the Black Creek Basin.
Areal flooding of rural portions of SE GA and inland North FL will
likely require the issuance of a Flood Watch for SE GA and
portions of NE FL sometime during the Tuesday through Thursday
time frame.

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  72  83  70  83  70 /  90  90  70  90  50
SSI  76  86  75  86  75 /  50  70  70  90  50
JAX  75  86  73  85  73 /  40  70  80  90  40
SGJ  74  88  74  86  74 /  40  70  70  80  40
GNV  74  84  73  84  72 /  60  80  80  80  40
OCF  74  86  74  85  73 /  50  80  80  80  30

&&

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

Special Weather Statement
National Weather Service Jacksonville FL
324 PM EDT Mon Aug 2 2021

FLZ125-133-225-022015-
Coastal St. Johns FL-Trout River FL-Coastal Duval FL-
324 PM EDT Mon Aug 2 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL ST. JOHNS AND
SOUTHEASTERN DUVAL COUNTIES UNTIL 415 PM EDT...

* At 324 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over Craig Field, or near Arlington,
  moving southeast at 20 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Unf, Arlington, Ponte Vedra Beach, Neptune Beach, Palm Valley,
  Sawgrass, Baymeadows, Craig Field, San Pablo and Little Talbot
  Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

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

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 3010 8148 3036 8167 3037 8167 3037 8168
      3041 8171 3049 8142 3044 8137 3025 8135
      3017 8132
TIME...MOT...LOC 1924Z 314DEG 17KT 3036 8155

23

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
329 PM EDT MON AUG 2 2021

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

0321 PM     TSTM WND GST     5 W MAYPORT             30.39N 81.49W
08/02/2021  M41 MPH          Duval              FL   MESONET

            WIND GUST TO 41 MPH AT WEATHERFLOW SITE ON BUCK ISLAND.

&&

Special Weather Statement
National Weather Service Jacksonville FL
336 PM EDT Mon Aug 2 2021

FLZ020-021-122-222-022015-
Southern Columbia FL-Hamilton FL-Suwannee FL-Northern Columbia FL-
336 PM EDT Mon Aug 2 2021

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL COLUMBIA...NORTHERN
SUWANNEE AND SOUTHEASTERN HAMILTON COUNTIES UNTIL 415 PM EDT...

* At 336 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm near Dowling Park, or 8 miles west
  of Live Oak, moving east at 25 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Live Oak, White Springs, Wellborn, Suwannee Valley, Newburn and
  Houston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

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

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 3035 8320 3039 8270 3012 8270 3017 8320
TIME...MOT...LOC 1936Z 270DEG 21KT 3026 8312

23

Special Weather Statement
National Weather Service Jacksonville FL
344 PM EDT Mon Aug 2 2021

GAZ136-152>154-165-166-264-022030-
Northeastern Charlton GA-Inland Glynn GA-Inland Camden GA-
Coastal Glynn GA-Brantley GA-Coastal Camden GA-Wayne GA-
344 PM EDT Mon Aug 2 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CAMDEN...GLYNN...EAST
CENTRAL BRANTLEY AND SOUTHEASTERN WAYNE COUNTIES UNTIL 430 PM EDT...

* At 343 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm over Waverly, or 8 miles north of
  Woodbine, moving northeast at 25 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with this storm.

* Locations impacted include...
  Brunswick, St. Simons Island, Woodbine, Dock Junction, Country Club
  Estates, Thalmann, Everett, Waynesville, Waverly and Tarboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

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

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 3085 8154 3101 8194 3148 8162 3147 8161
      3145 8163 3143 8161 3136 8152 3133 8145
      3133 8144 3131 8144 3128 8139 3129 8139
      3128 8138 3130 8137 3131 8134 3129 8134
      3128 8131
TIME...MOT...LOC 1943Z 213DEG 24KT 3108 8170

23

Special Weather Statement
National Weather Service Jacksonville FL
348 PM EDT Mon Aug 2 2021

FLZ023-024-232-425-GAZ163-350-364-022030-
Baker FL-Western Clay FL-Western Duval FL-Inland Nassau FL-Clinch GA-
Western Charlton GA-Southern Ware GA-
348 PM EDT Mon Aug 2 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NASSAU...CENTRAL
BAKER...NORTH CENTRAL CLAY...SOUTHWESTERN DUVAL...SOUTHEASTERN
WARE...SOUTHEASTERN CLINCH AND CENTRAL CHARLTON COUNTIES UNTIL 430 PM
EDT...

* At 348 PM EDT, National Weather Service meteorologists were
  tracking strong thunderstorms along a line extending from 11 miles
  south of Argyle to near Sanderson. Movement was east at 20 mph.

* Winds in excess of 45 mph and minor flooding due to heavy rainfall
  is possible with these storms.

* Locations impacted include...
  Stephen Foster State Park, Taylor, Macclenny, Glen St. Mary, Cecil
  Field, Maxville, St. George, Oakleaf Plantation, Bryceville and
  Baldwin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.

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

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 3098 8270 3097 8226 3014 8180 3027 8230
TIME...MOT...LOC 1948Z 280DEG 17KT 3091 8259 3033 8227

23

PRELIMINARY LOCAL STORM REPORT...CORRECTED
National Weather Service Jacksonville FL
352 PM EDT MON AUG 2 2021

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

0336 PM     TSTM WND GST     4 W MAYPORT             30.39N 81.48W
08/02/2021  M45.00 MPH       Duval              FL   MESONET

            WIND GUST TO 45 MPH AT WEATHERFLOW SITE ON BUCK ISLAND.

&&
THIS IS AN UPDATE OF THE PRIOR REPORT.