Tuesday, September18, 2018 L-36.com


Marine Weather and Tides
St. Marks, FL

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Sunrise 7:22AMSunset 7:39PM Tuesday September 18, 2018 4:57 PM EDT (20:57 UTC) Moonrise 2:46PMMoonset 12:35AM 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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GMZ730 Apalachee Bay Or Coastal Waters From Keaton Beach To Ochlockonee River Fl Out To 20 Nm- Coastal Waters From Mexico Beach To Okaloosa Walton County Line Fl Out 20 Nm- Coastal Waters From Mexico Beach To Apalachicola Fl Out 20 Nm- Coastal Waters From Ochlockonee River To Apalachicola Fl Out To 20 Nm- Coastal Waters From Suwannee River To Keaton Beach Fl Out 20 Nm- Waters From Mexico Beach To Okaloosa Walton County Line Fl From 20 To 60 Nm- Waters From Apalachicola To Mexico Beach Fl From 20 To 60 Nm- Waters From Suwannee River To Apalachicola Fl From 20 To 60 Nm- 325 Pm Edt Tue Sep 18 2018
Tonight..West winds 5 to 10 knots. Seas 1 foot. Dominant period 3 seconds. Protected waters mostly smooth. Slight chance of showers and Thunderstorms after midnight.
Wednesday..Northwest winds around 5 knots becoming southwest 5 to 10 knots in the afternoon. Seas 1 foot or less. Dominant period 4 seconds. Protected waters smooth. Isolated showers and Thunderstorms.
Wednesday night..Southwest winds 5 to 10 knots early in the evening becoming light and variable. Seas 1 foot or less. Dominant period 4 seconds. Protected waters smooth. Isolated showers and Thunderstorms after midnight.
Thursday..Southeast winds 5 to 10 knots. Seas 1 foot or less. Dominant period 3 seconds. Protected waters mostly smooth. Isolated showers and Thunderstorms.
Thursday night..East winds 10 to 15 knots. Seas 2 to 3 feet. Dominant period 3 seconds. Protected waters a light to moderate chop. Isolated showers and Thunderstorms in the evening, then scattered showers and Thunderstorms after midnight.
Friday..East winds 10 knots. Seas 1 to 2 feet. Protected waters a light chop. Chance of showers and Thunderstorms.
Friday night..East winds 10 to 15 knots. Seas around 2 feet. Protected waters a light to moderate chop. Chance of showers and Thunderstorms.
Saturday..East winds 10 knots. Seas 1 to 2 feet. Protected waters a light chop. Chance of showers and Thunderstorms.
Saturday night..East winds 10 to 15 knots. Seas 1 to 2 feet. Protected waters a light chop. Chance of showers and Thunderstorms.
Sunday..Southeast winds 10 knots. Seas 1 to 2 feet. Protected waters a light chop. Chance of showers and Thunderstorms.
GMZ700 Synopsis For The Suwannee River To Okaloosa-walton County Line Out To 60 Nm 325 Pm Edt Tue Sep 18 2018
Synopsis..Winds will be light for the beginning of the period shifting from southwesterly on Tuesday and Wednesday to an easterly regime from Thursday through the weekend. During this latter period, nightly surges of winds up to 15 knots will be possible.


7 Day Forecast for Marine Location Near St. Marks, FL
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location: 30.08, -84     debug


Area Discussion for -
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Fxus62 ktae 181922
afdtae
area forecast discussion
national weather service tallahassee fl
322 pm edt Tue sep 18 2018

Near term [through tonight]
Deep layer ridging is in place over the eastern gulf waters and
the fl peninsula, with a trough pushing eastward off the mid-
atlantic coastline. This is producing mostly west- northwesterly
flow over the tri-state area. The movement of the trough aloft,
combined with our diurnal seabreeze circulation is enhancing
development of showers and thunderstorms somewhat this afternoon.

Later, with the loss of daytime heating, storms over lad will wind
down within a few hours of sunset and overnight convection will
be focused over our offshore waters. Temperatures are currently
making their peak in the low-mid 90s and will cool overnight into
the low-mid 70s. Patchy fog will be possible in south central ga
in the early morning hours.

Short term [Wednesday through Thursday night]
The upper ridge over the southern plains will build steadily
eastward to a position over the carolinas by 12z Friday. At the
surface, a surface trough will be dissipating over the area with a
ridge to the north. Offshore flow will keep sea-breeze induced
showers and storms confined to areas south of u.S. 84. This will
lead to another hotter than normal day with highs across inland
areas in the lower to mid 90s and heat indices around 100. By
Thursday, the surface high will push off the mid atlantic coast with
low level winds veering to easterly. Subsidence underneath the upper
ridge will suppress activity across our ga zones with chance pops
further south and west. Temperatures will be a degree or two lower
than on Wednesday.

Long term [Friday through Tuesday]
Deep-layer ridging to the northeast and subsidence ahead of an
approaching tutt will keep convection relatively suppressed through
Friday and Saturday. After that time, the tutt will move west and
deep layer flow will become southerly. This will increase our pops
to around 40% from Sunday into early next week.

Aviation [through 18z Wednesday]
Vfr conditions should prevail through the period at most sites
with the brief possible exceptions of thunderstorms this afternoon
across the area and patchy (<20% coverage) MVFR vsbys around
sunrise near vld. Winds will be light.

Marine
Winds will be light for the beginning of the period shifting from
southwesterly on Tuesday and Wednesday to an easterly regime from
Thursday through the weekend. During this latter period, nightly
surges of winds up to 15 knots will be possible.

Fire weather
With light winds and rh values above critical thresholds, red
flag conditions are not expected through the next few days.

Scattered thunderstorms are possible each afternoon as well.

Hydrology
Flooding will not be a concern over the next several days.

Spotter information statement
Spotter activation is not requested. However, spotters are always
encouraged to safely report significant weather conditions when they
occur by calling the office or tweeting us @nwstallahassee.

Preliminary point temps pops
Tallahassee 74 94 73 92 73 10 30 10 30 20
panama city 76 91 75 90 74 10 20 10 30 30
dothan 72 94 72 92 71 10 10 0 30 20
albany 73 95 73 93 71 10 10 0 20 10
valdosta 73 94 73 92 71 10 10 10 20 10
cross city 75 94 73 93 72 10 30 20 30 10
apalachicola 77 90 76 88 76 10 20 10 20 30

Tae watches warnings advisories
Fl... None.

Ga... None.

Al... None.

Gm... None.

Near term... Nguyen
short term... Wool
long term... Wool
aviation... Nguyen
marine... Wool
fire weather... Ln
hydrology... Wool


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SHPF1 - SHP - Shell Point, FL 15 mi124 min S 7 G 9.9 88°F 87°F1012.7 hPa
KTNF1 - Keaton Beach, FL 28 mi58 min SW 8 G 9.9 86°F 1013.4 hPa (-2.3)76°F

Wind History for Apalachicola, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Perry-Foley, Perry-Foley Airport, FL23 mi83 minN 010.00 miMostly Cloudy89°F77°F69%1013.2 hPa

Wind History from 40J (wind in knots)
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Last 24hrSW12
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SW10SW4W3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE6E4N5SE3CalmSW9
1 day agoSW10SW8SW5SW3S3SW3S3SE3SE3S3S6CalmCalmCalmCalmCalmCalmSW7SW8SW10
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W8W4CalmCalmCalmCalmCalmCalmCalmN3N4CalmCalmCalmCalmCalmN4NW3W7W6SW10SW10SW7

Tide / Current Tables for Aucilla River entrance, Florida
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for St. Marks River Entrance, Florida
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (16,3,4,5)
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Ground Weather Radar Station Tallahassee, FL
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weather_mapweather_map weather_map

Gulf Stream Current


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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.