Thursday, March21, 2019 L-36.com


Marine Weather and Tides
St. Marks, FL

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:38AMSunset 7:50PM Thursday March 21, 2019 7:29 AM EDT (11:29 UTC) Moonrise 7:43PMMoonset 7:17AM Illumination 100% Phase: Full Moon; Moon at 15 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- 249 Am Edt Thu Mar 21 2019 /149 Am Cdt Thu Mar 21 2019/
.small craft exercise caution...
Today..West winds 15 to 20 knots. Seas 2 to 3 feet. Dominant period 3 seconds. Protected waters a moderate chop.
Tonight..Northwest winds 15 to 20 knots. Seas 2 to 3 feet. Dominant period 4 seconds. Protected waters a moderate chop.
Friday..Northwest winds 10 to 15 knots. Seas 2 to 3 feet. Dominant period 4 seconds. Protected waters a light chop.
Friday night..Northwest winds 10 to 15 knots becoming north 10 to 15 knots early in the morning. Seas 1 to 2 feet. Dominant period 4 seconds. Protected waters a light chop.
Saturday..East winds 10 knots becoming southeast 5 to 10 knots late in the afternoon. Seas 1 to 2 feet. Dominant period 3 seconds. Protected waters a light chop.
Saturday night..South winds 5 to 10 knots becoming northeast 10 knots in the late evening. Seas 0 to 1 feet. Protected waters a light chop.
Sunday..Southeast winds 10 knots. Seas 1 to 2 feet. Protected waters a light chop.
Sunday night..Southeast winds 5 to 10 knots. Seas 1 to 2 feet. Protected waters mostly smooth.
Monday..Southwest winds 10 knots. Seas 1 to 2 feet. Protected waters a light chop.
GMZ700 Synopsis For The Suwannee River To Okaloosa-walton County Line Out To 60 Nm 249 Am Edt Thu Mar 21 2019
Synopsis.. Conditions will be near advisory levels this afternoon and tonight as a dry cold front moves across the area. Small craft should exercise caution. Winds and seas will subside starting on Friday with winds less than 15 knots and seas below 2 feet for the rest of the weekend and into Monday.


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 211057
afdtae
area forecast discussion
national weather service tallahassee fl
657 am edt Thu mar 21 2019

Aviation
[through 12z Friday]
vfr conditions will prevail through the TAF cycle. West to
northwest winds will increase and become gusty later this morning
into the afternoon behind the passage of a dry cold front.

Prev discussion [251 am edt]
Near term [through today]
The axis of an upper trough and associated dry cold front will sweep
through the region today. Ahead of the front, temps will warm into
the lower to mid 70s across the entire tri-state region. With a dry
airmass in place, minimum relative humidity values will drop as low
as the mid 20 percent range. In the wake of the front, winds will
shift to the northwest and become breezy.

Short term [tonight through Saturday night]
A deepening upper trough will be dipping south today and moving
into the northeast tonight. The dry cold front will be through the
region by tonight with northwest flow in its wake. The air behind it
will be well modified by the time it arrives which means lows
tonight will only be a deg or two colder than last night with highs
Friday around 70.

High pressure will build in at the surface for Friday and
Saturday with deep layer ridging building between the previous
upper low and another one moving into the pacific nw. This leads
to clear skies and warming temps. Lows Fri night will be in the
mid 40s and a few deg warmer Sat night. Highs Saturday will rise
into the lower 70s.

Long term [Sunday through Thursday]
High pressure shifts east on Sunday with southerly flow returning.

Mid level ridging stays in place as the upper level ridge breaks
down, allowing the next upper shortwave to move east. Temps continue
to rise with highs Sunday in the upper 70s and a deg or two warmer
on Monday. Lows will warm to the mid 50s by Monday night. The gfs
and ECMWF are still quite different with the synoptic set up next
week with the GFS sweeping a cold front and associated precip
through Monday evening through Tuesday morning. The ecmwf, although
more progressive than previous runs, brings a deeper upper low and
stronger surface feature through, leaving rain in the forecast from
Monday night through late Tuesday night. Both models leave northerly
flow and drier and cooler air behind it. Will keep the blended pops
for now but lean towards a more progressive solution.

Highs will fall Tuesday-Thursday with temps in the upper 60s lower
70s. Lows will drop back to the mid 40s.

Marine
Conditions will be near advisory levels this afternoon and tonight
as a dry cold front moves across the area. Small craft should
exercise caution. Winds and seas will subside starting on Friday
with winds less than 15 knots and seas below 2 feet for the rest
of the weekend and into Monday.

Fire weather
A cold front will usher in a reenforcement of drier air to our
region today and Friday with minimum relative humidity values
dropping into the mid to upper 20 percent range across most inland
areas. Winds will also become gusty this afternoon in the wake of
the front. However, available fuel moisture is currently above
critical levels so red flag conditions are not expected to be met.

Winds will be lighter on Friday.

Hydrology
No rain is expected at least until Monday night. Even then, less
than half an inch of rain is forecast. Flooding is not expected.

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 76 45 72 44 75 0 0 0 0 0
panama city 70 50 67 50 70 0 0 0 0 0
dothan 71 43 69 44 71 0 0 0 0 0
albany 71 43 69 44 71 0 0 0 0 0
valdosta 75 44 69 43 73 0 0 0 0 0
cross city 75 47 71 45 76 0 0 0 0 0
apalachicola 71 50 68 50 70 0 0 0 0 0

Tae watches warnings advisories
Fl... None.

Ga... None.

Al... None.

Gm... None.

Near term... Barry
short term... Ln
long term... Ln
aviation... Barry
marine... Ln
fire weather... Barry
hydrology... Ln


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SHPF1 - SHP - Shell Point, FL 15 mi95 min WNW 4.1 G 5.1 49°F 60°F1017 hPa
KTNF1 - Keaton Beach, FL 28 mi29 min NE 1 G 1 47°F 1017.7 hPa (-0.0)37°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 mi34 minN 07.00 miFair38°F37°F95%1017.9 hPa

Wind History from 40J (wind in knots)
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Last 24hrNE5NE5NE7NE11
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NE8N7N8N4N7NW7N6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
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2 days agoN3NE4N6NE6NE9
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N10N9N6N3CalmCalmN4CalmCalmCalmN5NE6N5NE5NE5N5

Tide / Current Tables for Aucilla River entrance, Florida
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Aucilla River entrance
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Thu -- 03:07 AM EDT     3.50 feet High Tide
Thu -- 07:38 AM EDT     Sunrise
Thu -- 08:16 AM EDT     Moonset
Thu -- 09:28 AM EDT     -0.26 feet Low Tide
Thu -- 03:36 PM EDT     3.41 feet High Tide
Thu -- 07:47 PM EDT     Sunset
Thu -- 08:43 PM EDT     Moonrise
Thu -- 09:47 PM EDT     -0.27 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.72.53.23.53.32.71.910.2-0.2-0.20.31.122.83.33.432.21.30.4-0.1-0.30.1

Tide / Current Tables for St. Marks River Entrance, Florida
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St. Marks River Entrance
Click for Map
Thu -- 03:04 AM EDT     3.76 feet High Tide
Thu -- 07:39 AM EDT     Sunrise
Thu -- 08:17 AM EDT     Moonset
Thu -- 09:23 AM EDT     -0.29 feet Low Tide
Thu -- 03:33 PM EDT     3.66 feet High Tide
Thu -- 07:48 PM EDT     Sunset
Thu -- 08:44 PM EDT     Moonrise
Thu -- 09:42 PM EDT     -0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.83.53.83.52.9210.2-0.2-0.20.31.22.23.13.63.63.12.31.30.4-0.2-0.30.1

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 (7,2,3,4)
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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.