Monday, August20, 2018 L-36.com


Marine Weather and Tides
St. Augustine South, FL

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Sunrise 6:54AMSunset 8:01PM Monday August 20, 2018 3:00 AM EDT (07:00 UTC) Moonrise 3:01PMMoonset 12:58AM Illumination 64% Phase: Waxing Gibbous; Moon at 9 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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AMZ454 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- 855 Pm Edt Sun Aug 19 2018
Rest of tonight..South southwest winds 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds. Inland waters a moderate chop. A chance of showers and Thunderstorms.
Monday..Southwest winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Dominant period 5 seconds. Inland waters a light chop. A chance of showers and Thunderstorms in the afternoon.
Monday night..South southwest winds 15 knots. Seas 2 to 4 feet. Dominant period 5 seconds. Inland waters a moderate chop. A chance of showers and Thunderstorms.
Tuesday..South winds 10 to 15 knots. Seas 2 to 3 feet. Dominant period 4 seconds. Inland waters a light chop. A chance of showers and Thunderstorms.
Tuesday night..Southwest winds 15 knots. Seas 2 to 4 feet. Inland waters a moderate chop. A chance of showers and Thunderstorms.
Wednesday..South southwest winds 10 to 15 knots, becoming south during the afternoon. Seas 2 to 3 feet. Inland waters a light chop. A chance of showers and Thunderstorms.
Wednesday night..West southwest winds 15 knots. Seas 2 to 3 feet. Inland waters a light chop. A chance of showers and Thunderstorms.
Thursday and Thursday night..Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Inland waters mostly smooth. A chance of showers and Thunderstorms.
Friday..East southeast winds 5 to 10 knots. Seas 2 to 3 feet. Inland waters mostly smooth. Showers and Thunderstorms likely.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 855 Pm Edt Sun Aug 19 2018
Synopsis.. Atlantic high pressure will remain positioned just south of the northeast florida waters through Tuesday. A cold front will approach the georgia waters from the northwest by late Wednesday, and will then stall near the georgia and florida border late this week while dissipating. High pressure building over the mid- atlantic and new england late this week will Wedge down the u.s. Eastern seaboard, resulting in light onshore winds developing by late Thursday.


7 Day Forecast for Marine Location Near St. Augustine South, FL
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location: 29.87, -81.31     debug


Area Discussion for - Jacksonville, FL
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Fxus62 kjax 200224
afdjax
area forecast discussion
national weather service jacksonville fl
1024 pm edt Sun aug 19 2018

Update
Late evening surace analysis depicts the axis of atlantic ridging
(1023 millibars) extending westward across central florida.

Meanwhile, a wavy stationary frontal boundary extends from the
missouri and ohio valleys eastward to coastal virginia. Aloft

Deep-layered ridging extends westward from the bahamas across
the florida peninsula, with a shortwave trough progressing
eastward from the ohio valley towards the mid-atlantic states,
while a deep cutoff trough over the plains states was poised to
pivot eastward. Numerous thunderstorms developing on the northern
periphery of deep-layered ridging over central florida this
afternoon created a cold pool that was advected north-
northeastward, which has sparked scattered to numerous slow moving
thunderstorms this evening across locations east of u.S. Highway
301. Excessive rainfall totals have been noted this evening by
multi-radar, multi-sensor estimates and rain gauges along the st.

Johns river basin in eastern marion, southern putnam, western
flagler and portions of st. Johns counties. Convection has
developed northward along the interstate 95 corridor in duval,
nassau and camden counties, with heavy rainfall and frequent
lightning strikes being the main threats through midnight. Short-
term, high resolution guidance suggests that convection will wind
down shortly after midnight, with mid and high altitude debris
clouds beginning to thin by the predawn hours. Lows tonight will
generally fall to the mid 70s inland and the upper 70s at the
coast.

A pocket of drier air aloft along the northern periphery of the
atlantic ridge will advect over interior portions of southeast
georgia on Monday, which will likely limit afternoon convective
coverage to isolated. Meanwhile, deep west-southwesterly flow will
prevail, with higher moisture values in excess of 2 inches
advecting north-northeastward over northeast and north central
florida. Expect a similar convective pattern to today, with late
afternoon thunderstorms blossoming over the southern st. Johns
river basin during the mid to late afternoon hours moving slowly
north northeastward and overspreading the rest of the st. Johns
river basin and locations east of u.S. Highway 301 in southeast
georgia towards sunset. Inland highs will soar to the low to mid
90s, while the afternoon sea breeze will push very slowly inland,
keeping coastal highs around 90. Maximum heat index values of
100-105 are forecast. Wet microbursts will be possible, especially
along the i-95 corridor by late afternoon and early evening as
existing convection encounters the atlantic coast sea breeze and
other mesoscale outflows.

Aviation
Mainly MVFR impacts are expected at jax through around 04z as
thunderstorms will be slow to exit. Periods of MVFR conditions
will be possible at the remainder of the remainder of the
terminals through 05z as scattered thunderstorms continue to
develop and move slowly. Activity should dissipate by 06z, with
vfr conditions prevailing at the regional terminals through around
16z. The exception may be at vqq overnight, where periods of MVFR
visibilities will be possible from 07z-11z. Scattered
thunderstorms will be possible after 16z at the regional
terminals, with the atlantic sea breeze crossing the coastal
terminals and moving inland after 16z 17z.

Marine
The axis of atlantic surface ridging will remain positioned across
central florida through Tuesday. Evening south-southwesterly wind
surges will bring speeds up to near caution levels, with sustained
breezes around 15 knots each evening through Tuesday, with mostly
offshore winds prevailing through the overnight and morning
hours. Southeasterly winds will develop near shore on Monday and
Tuesday afternoons as the sea breeze pushes inland. 2 to 4 foot
seas will prevail through midweek. A cold front will then approach
the southeast georgia waters by Wednesday evening, with this
boundary weakening and decelerating as it enters our area later
this week. High pressure building in the wake of this front
across the mid-atlantic states and new england later this week
will result in a light onshore wind regime by Friday, with
widespread showers and thunderstorms possible as the front stalls
near the florida georgia border.

Rip currents: low wave heights and the lack of a longer period
swell should result in a low risk on Monday. A longer period
southeasterly swell should arrive at area beaches towards midweek.

Preliminary point temps pops
Amg 73 93 74 92 20 20 10 30
ssi 77 90 77 90 20 20 30 20
jax 74 92 75 93 30 30 30 30
sgj 76 90 76 89 60 30 30 40
gnv 73 92 73 91 10 40 20 30
ocf 73 92 73 91 20 40 30 40

Jax watches warnings advisories
Fl... None.

Ga... None.

Am... None.

Nelson hess mcginnis


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SAUF1 - St. Augustine, FL 3 mi60 min S 7 G 7 75°F 79°F1018 hPa (-0.6)
RCYF1 14 mi30 min 88°F
41117 15 mi30 min 82°F2 ft
GTXF1 - Guana Tolomato Matanzas Reserve, FL 15 mi75 min S 1.9 74°F 1020 hPa71°F
LTJF1 36 mi30 min 79°F 73°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 37 mi30 min WSW 5.1 G 6 79°F 85°F1017.4 hPa
BLIF1 38 mi30 min SW 6 G 7 80°F 1018.1 hPa80°F
DMSF1 38 mi30 min 86°F

Wind History for I-295 Bridge, St Johns River, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Northeast Florida Regional Airport, FL7 mi64 minSSW 410.00 miFair74°F72°F94%1018 hPa

Wind History from SGJ (wind in knots)
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Last 24hrSW5SW4W4W4W6W6W3W5NW33SE11SE11--SE12SE11SE14SE9S13W10S6SW4S4CalmS4
1 day agoSW5S4S4S3SW4SW4SW74SW54SE12SE8SE9SE11SE12
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2 days agoCalmCalmS4S3CalmS3S754SW5SE11SE14SE15SE14
G19
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Tide / Current Tables for State Road 312, Matanzas River, Florida
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State Road 312
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Mon -- 01:58 AM EDT     Moonset
Mon -- 04:42 AM EDT     3.72 feet High Tide
Mon -- 06:55 AM EDT     Sunrise
Mon -- 10:47 AM EDT     0.32 feet Low Tide
Mon -- 04:00 PM EDT     Moonrise
Mon -- 05:27 PM EDT     4.39 feet High Tide
Mon -- 08:00 PM EDT     Sunset
Mon -- 11:43 PM EDT     0.76 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.72.43.13.63.73.42.721.20.50.30.71.52.33.23.94.34.33.93.32.41.60.9

Tide / Current Tables for Crescent Beach, Matanzas River, Florida
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Crescent Beach
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Mon -- 01:58 AM EDT     Moonset
Mon -- 05:14 AM EDT     4.05 feet High Tide
Mon -- 06:55 AM EDT     Sunrise
Mon -- 11:33 AM EDT     0.69 feet Low Tide
Mon -- 04:00 PM EDT     Moonrise
Mon -- 05:54 PM EDT     4.65 feet High Tide
Mon -- 08:00 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.72.333.643.93.32.621.40.80.81.42.233.84.44.64.33.83.22.51.7

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Jacksonville, FL (3,6,7,8)
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Ground Weather Radar Station Jacksonville, FL
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.