Flash Flood Warning 1, NWS Jacksonville, FL

Area Forecast Discussion
National Weather Service Jacksonville FL
313 PM EDT Sat Jun 6 2020

...FLOOD WATCH THROUGH SUNDAY FOR SUWANNEE RIVER VALLEY...

...ISOLATED TORNADO POTENTIAL NE FLORIDA THROUGH THIS EVENING...

.NEAR TERM [through Sunday]...

A flash flood watch has been issued through Sun evening for our
western FL zones as widespread moderate to locally heavy rainfall
overspreads NE FL from the south. Deep tropical moisture will
remain in place (PWAT 2.5") with the area on the east side of TS
Cristobal as the storm approaches the LA Gulf Coast through Sun
afternoon. Waves of moderate to heavy rainfall with isolated
embedded tstorms will continue to pivot northward into the evening,
then tonight anticipate a more solid band of moderate to heavy
rainfall developing across north Florida as low level convergence
increases between a lifting frontal zones across south -central
FL and a persistent low level ridge axis holding firm just north
of the Altamaha River basin. This ridge will limit the northward
extend/expansion of the convective band into Sun, and generally
focus a W-E oriented swath of heavy rainfall generally near and
south of the I-10 corridor late tonight into Sunday morning.
Please refer to the below 'Hydrology' section for rainfall
outlook. Ridge strengthens north of the Altamaha Region Sun
afternoon, shunting corridor of heavy rain SSW toward the I-75
corridor of NE FL with drier mid level air (700-500 mb) decreasing
rain chances across SE GA and eastern NE FL into Sun evening.

In addition to heavy rainfall potential, there will be a low
tornado threat for NE FL into the evening with elevated 0-1 km
shear values 20-25 kts with low level ESE winds under increasing
SSW winds out of the GOMEX, with speeds increasing to 35-45 kts at
850 mb through 06z.

Cloudy skies, and warm humidity ESE to S flow will continue into
with daytime highs below normal in the 70s to low 80s and muggy
nighttime lows in the upper 60s to low/mid 70s.

.SHORT TERM [Monday through Tuesday]...

Mon...A weak pressure pattern in place across the local area as
the remnant low of Cristobal tracks northward across the lower MS
river valley and the 1000-700 mb ridge centers builds from the
Bahamas Mon and then over N FL into Tuesday. A ribbon of tropical
moisture (PWAT over 2") will rotate across our GA zones and toward
the Atlantic coast into Mon evening as steering flow weakens and
back slightly SSW between the low to our WNW and the ridge to the
SSE. This pattern will shift morning convection across our western
Gulf Coast zones across SE GA and toward the Atlantic coast into
the afternoon and evening. Main convective hazard will be locally
heavy rainfall with deep moisture and slow motion over the region.
High temperatures will trend below normal in the low/mid 80s with
muggy lows in the 70s.

Tue...Very slow storm motion under the mean layer 1000-700 mb
ridge and lingering high moisture (PWAT 1.8-2 inches) will
continue high rain chances over the local area, but with a more
diurnal sea breeze regime expected with both sea breezes
developing along the Atlantic and Gulf Coast, merging inland
between Highway 301 and I-75 into the late afternoon and early
evening. Very warm temps aloft with lack of strong forcing will
limit severe storm strength, but will continue the localized heavy
rainfall threat and increase the potential of convective wet
downbursts in stronger cells given more diurnal instability.
Temperatures will warm into the low 90s inland given less morning
cloud cover. Precip will gradually fade in coverage inland and
intensity into Tue night with linger clouds keep lows mild in the
low 70s. An approaching weak front from the NE will maintain a low
chance of mainly coastal showers and isolated tstorms through Wed
morning.

.LONG TERM [Wed through Sat]...

Wed & Thu...Elevated rain chances continue across the local area
with deep tropical moisture (PWAT over 2") lingering over the
region. A 'backdoor' cold front/trough axis is expected to shift
inland along the local Atlantic coast early Wed, with morning
showers and isolated tstorms shifting inland into the afternoon
and evening hours. This trough axis will converge with a southward
moving trough across GA Wed night into Thu, with elevated rain
chances continued across SE GA into Thu morning. A passing mid
level short wave trough will enhance convection across inland
areas Thu afternoon into Thu evening with a few stronger storms
possible given the enhanced forcing aloft with the main t'storm
hazards this period localized flooding rainfall potential and wet
downbursts due to precip loading. High temperatures will trend
near to below normal in the low/mid 80s given abundant cloud cover
and rain chances this period. Low temperatures will trend near to
above normal in the 70s.

Fri & Sat...Drier air finally begins to filter across the region
from the WNW as a mean layer mid/upper level trough deepens across
the eastern CONUS. PWAT content returns back toward climo values
in the 1.4.-1.6 inch range Fri with the linger surface front
across south GA. This front, combined with forcing from the sea
breezes and cooler temps aloft in the -7 to -9 degC range under
the deepening upper trough could bring a better chance of a few
stronger storms especially during the afternoon and evening,
although overall storm coverage will trend downward. Most
convection fades Fri evening with loss of diurnal heating,
however, a low chance of precip will continue across SE GA through
Sat morning where surface front will finally begin to edge farther
south. Sat morning into Sat afternoon, the front is expected to
shift south across NE FL with a drier airmass expected Sat night
as PWAT content falls below normal values (less than 1 inch)
trailing the frontal passage with a deep layer WNW flow over the
local area. High temperatures will trend back toward normal values
in the upper 80s to near 90 as deep moisture decreases with low
temperatures generally cooling back toward normal values in the
mid 60s inland to low 70s coast.

&&

.AVIATION...
[Through 18Z Sunday]

IFR ceilings are overspreading GNV, with MVFR ceilings moving over
the rest of the northeast FL terminals. VFR ceilings should
prevail at SSI through around 00Z, with conditions then
deteriorating overnight. Heavy showers will continue to move
northward from the FL peninsula after 20Z, with periods of IFR
visibilities possible towards 21Z at GNV and then towards 23Z at
the Duval County terminals and SGJ. Embedded thunderstorms will be
possible at the northeast FL terminals, mainly after 00Z.
Downpours and periods of IFR visibilities are expected to reach
SSI towards 02Z. Southerly surface winds sustained at 5-10 knots
at the Duval County terminals will shift to southeasterly this
afternoon, with sustained speeds increasing to 10-15 knots after
03Z. Southeasterly surface winds sustained at 5-10 knots at GNV
and SGJ will become easterly after 21Z, with sustained speeds
increasing to 10-15 knots after 00Z. Southerly surface winds
should increase to 5-10 knots at SSI this afternoon and will then
shift to southeasterly after 00Z, with sustained speeds increasing
to 10-15 knots.

&&

.MARINE...

Tropical Storm Cristobal will track northward toward the central Gulf
of Mexico Coast through Sunday with high pressure offshore of the Florida
Atlantic coast. Widespread rain with embedded thunderstorms will impact
the local waters through Sunday. South winds will increase tonight
and Sunday to marginal Small Craft Exercise Caution levels over the
outer waters with speeds 15-20 kts. Headlines are not expected beyond
Sun night with an extended period of SSE winds expected. High pressure
builds across south Florida Monday and Tuesday. A weak trough will
move across the local waters from the east Wednesday and merge with
a front across south Georgia. This front will linger across the region
Thursday and Friday.

RIP CURRENTS: Low Risk SE GA beaches today. Moderate risk NE FL
beaches today. Moderate risk for all beaches expected Sunday. Low
to marginally moderate risk of rips expected Mon-Tue given weak
winds. Elevated rip current risk returns Wed due to stronger
onshore flow.

&&

.FIRE WEATHER...

Persistent moderate to heavy rainfall with isolated embedded
thunderstorms will move south to north across the forecast area
through tonight and linger into Sunday across NE FL with low
daytime dispersion due to light winds and cloud cover. Rainfall
accumulations will generally range from 3-5 inches across NE
Florida through Sunday afternoon, with isolated higher amounts.
Rainfall amounts decrease across southeast Georgia with less than
1 inch total expected near the Altamaha River basin. Warmer, moist
southerly flow continues Monday with the highest coverage of
showers and storms in the afternoon.

&&

.HYDROLOGY...

Persistent, moderate to heavy rain shield will overspread the
local area from south to north through Sunday morning. Latest
consensus guidance continued to indicate widespread rainfall
totals through the next 24 hrs of 2-4 inches mainly south of the
I-10 corridor with locally higher amounts certainly possible
especially across the Suwannee River Valley and near the I-75
corridor. Recent CAMs including the HRRR, RAP and Nested NAM have
localized 6-9 inches through midday Sunday across parts of the
Suwannee River Valley. Issued a Flood Watch for our western tier
FL zones through Sunday evening, with localized flooding potential
for vulnerable urban areas including Jacksonville, Orange Park
and St. Augustine.

&&

.SPOTTER INFORMATION STATEMENT...

Spotter activation is requested. Spotters should safely report
significant weather conditions including measured rainfall and
flood reports and/or damage by calling the office or tweeting us
@NWSJacksonville.

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  70  80  72  88  72 /  60  70  30  70  20
SSI  73  79  74  86  75 /  70  70  30  50  20
JAX  71  79  72  89  74 /  90  90  30  60  20
SGJ  72  77  72  87  73 /  90  90  40  60  20
GNV  72  79  72  88  72 /  90  90  60  70  20
OCF  73  80  72  88  72 /  90  90  60  70  20

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Flash Flood Watch through Sunday evening for Central Marion-
     Eastern Alachua-Eastern Marion-Gilchrist-Hamilton-Northern
     Columbia-Southern Columbia-Suwannee-Western Alachua-Western
     Marion.

GA...None.
AM...None.
&&

Special Weather Statement
National Weather Service Jacksonville FL
447 PM EDT Sat Jun 6 2020

FLZ140-240-340-062145-
Central Marion FL-Western Marion FL-Eastern Marion FL-
447 PM EDT Sat Jun 6 2020

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL MARION COUNTY UNTIL 545
PM EDT...

* At 446 PM EDT, National Weather Service meteorologists were
  tracking a cluster of thunderstorms near Lynne, moving north at 25
  mph.

* Winds in excess of 40 mph and minor flooding due to heavy rainfall
  is possible with these storms.

* Locations impacted include...
  Ocala, Fort McCoy, Lynne, Lake Delancy, Sparr, Anthony, Santos,
  Silver Springs Shores, Lake Weir and Belleview.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This activity was also developing in an environment favorable for the
formation of funnel clouds. Stay tuned to NOAA weather radio and
local media for additional updates and possible warnings.

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 2896 8219 2938 8211 2944 8178 2943 8177
      2943 8176 2896 8197
TIME...MOT...LOC 2046Z 197DEG 21KT 2925 8198

SHASHY

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
511 PM EDT SAT JUN 6 2020

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

0415 PM     TSTM WND DMG     4 WSW LAKE WEIR         28.99N 82.05W
06/06/2020                   Marion             FL   911 CALL CENTER

            TREES AND POWER LINES WERE DAMAGED BY THUNDERSTORM WINDS
            FROM BELLEVIEW TO SUMMERFIELD ALONG SE 95TH COURT, NW
            20TH AVE, 92TH LOOP AND SE 126TH PLACE.

&&

AENYEDI

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
513 PM EDT SAT JUN 6 2020

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

0500 PM     HEAVY RAIN       BELLEVIEW               29.76N 82.86W
06/06/2020  M4.59 INCH       GILCHRIST          FL   MESONET

            A MESONET SITE MEASURED A STORM TOTAL DAILY RAINFALL OF
            4.59 INCHES ALONG SE 108TH LANE IN BELLEVIEW. OTHER
            OBSERATIONS AROUND THIS LOCATION MEASURED 3.5 TO 4.5
            INCHES WITHIN THE PAST 2 HOURS.

&&

AENYEDI

PRELIMINARY LOCAL STORM REPORT...CORRECTED
National Weather Service Jacksonville FL
516 PM EDT SAT JUN 6 2020

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

0500 PM     HEAVY RAIN       3 SSE SANTOS            29.06N 82.08W
06/06/2020  M4.59 INCH       Marion             FL   MESONET

            A MESONET SITE MEASURED A STORM TOTAL DAILY RAINFALL OF
            4.59 INCHES ALONG SE 108TH LANE IN BELLEVIEW. OTHER
            OBSERATIONS AROUND THIS LOCATION MEASURED 3.5 TO 4.5
            INCHES WITHIN THE PAST 2 HOURS.

&&

AENYEDI

Special Weather Statement
National Weather Service Jacksonville FL
525 PM EDT Sat Jun 6 2020

FLZ037-140-240-062215-
Central Marion FL-Putnam FL-Eastern Marion FL-
525 PM EDT Sat Jun 6 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN MARION AND CENTRAL
PUTNAM COUNTIES UNTIL 615 PM EDT...

* At 524 PM EDT, National Weather Service meteorologists were
  tracking showers and thunderstorms near Lake Delancy, or near Fort
  McCoy, moving north at 20 mph.

* Winds in excess of 40 mph and minor flooding due to heavy rainfall
  is possible with this shower.

* Locations impacted include...
  Palatka, Interlachen, Fort McCoy, Lake Delancy, Orange Springs,
  Hollister, Satsuma, Hog Valley and Mannville.

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 2932 8176 2933 8198 2970 8192 2963 8162
TIME...MOT...LOC 2124Z 194DEG 15KT 2939 8186

SHASHY

Special Weather Statement
National Weather Service Jacksonville FL
537 PM EDT Sat Jun 6 2020

FLZ020-122-GAZ162-062215-
Hamilton FL-Northern Columbia FL-Echols GA-
537 PM EDT Sat Jun 6 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL COLUMBIA...EASTERN
HAMILTON AND SOUTHEASTERN ECHOLS COUNTIES UNTIL 615 PM EDT...

* At 537 PM EDT, National Weather Service meteorologists were
  tracking a strong thunderstorm near Belmont, or near White Springs,
  moving north at 20 mph.

* Winds in excess of 40 mph possible with this storm.

* Locations impacted include...
  Belmont and Needmore.

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 3033 8257 3031 8271 3068 8290 3070 8260
TIME...MOT...LOC 2137Z 168DEG 18KT 3041 8269

SHASHY