Thursday, December13, 2018 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 7:24AMSunset 5:39PM Thursday December 13, 2018 3:06 AM EST (08:06 UTC) Moonrise 12:00PMMoonset 11:19PM Illumination 32% Phase: Waxing Crescent; Moon at 6 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 Suwannee River To Keaton Beach Fl Out 20 Nm- 235 Am Est Thu Dec 13 2018
Today..East winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 3 seconds. Protected waters a light to moderate chop. Slight chance of light rain in the afternoon.
Tonight..Southeast winds 15 to 20 knots. Seas 2 to 4 feet. Dominant period 3 seconds. Protected waters choppy. Chance of rain in the evening, then rain and chance of Thunderstorms after midnight.
Friday..South winds 15 to 20 knots. Seas 2 to 4 feet. Dominant period 5 seconds. Protected waters choppy. Rain and chance of Thunderstorms.
Friday night..Southwest winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 5 seconds. Protected waters a light to moderate chop. Rain likely and chance of Thunderstorms in the evening, then chance of rain after midnight.
Saturday..West winds 10 knots. Seas 2 to 3 feet. Dominant period 5 seconds. Protected waters a light chop. Slight chance of rain through the day.
Saturday night..Northwest winds 10 knots. Seas 2 to 3 feet. Protected waters a light chop.
Sunday..Northwest winds 10 to 15 knots. Seas 1 to 2 feet. Protected waters a light chop.
Sunday night through Monday..Northwest 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 235 Am Est Thu Dec 13 2018
Synopsis.. Light easterly winds will increase by late morning. A small craft advisory is in effect from 10 am est through Saturday evening. Rain and possibly a few strong to severe Thunderstorms are likely Thursday night and Friday.


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 130742
afdtae
area forecast discussion
national weather service tallahassee fl
242 am est Thu dec 13 2018

Near term [through today]
While northern and southern stream waves superposition over the
southern plains today, low mid level ridging will prevail over the
southeast. Some upper-level southern stream forcing will be present
today, though any precip generated by this disturbance would have to
fall through a relatively dry troposphere to reach the surface. Have
included a slight chance of very light rain during the second half
of the day to address the possibility of rain reaching the surface.

Otherwise, cloudy conditions and moderating high temperatures are
expected today. High temps are forecast to peak in the mid to upper
60s across the eastern big bend of florida, and may just barely
reach 60 across southeast alabama and parts of southwest georgia.

Short term [tonight through Saturday]
In the upper levels a cut-off low will move through the lower
mississippi valley, then northeastward to tennessee. At the surface
a low centered near ar la tx will move to the northeast. A cold
front will move through on tomorrow and tomorrow night. This system
could bring a few strong to severe storms. Instability will be low
but deep layer shear will be high at 40 to 60 knots. The best chance
for rain and thunderstorms will be tomorrow and tomorrow night. Lows
will be in the 50s or near 60 tonight. Lows will be mainly in the
50s tomorrow night. Highs will be in the 60s.

Long term [Saturday night through Thursday]
In the upper levels a cut-off low will be over the southeast until a
ridge builds in on Monday. Another trough will dig into the
southeast on Thursday. At the surface a low will be over the
southeast until a weak high moves in Sunday night. The next system
will approach Wednesday night. The next good chance for rain will be
Wednesday night into Thursday. Lows will be in the 40s. Highs will
be in the 60s.

Aviation
[through 06z Friday]
scattered MVFR restrictions beginning to develop may impact tlh and
vld for a brief period this morning.VFR should prevail around mid-
morning for all terminals, with prevailing MVFR beginning at dhn and
aby later this afternoon as light rain begins to spread inland.

Towards the end of the TAF conditions will begin to deteriorate as
rain increases in coverage and intensity.

Marine
Light easterly winds will increase by late morning. A small craft
advisory is in effect from 10 am est through Saturday evening. Rain
and possibly a few strong to severe thunderstorms are likely
Thursday night and Friday.

Fire weather
Low dispersion indices are expected on Friday, however, red flag
conditions are not expected over the next several days.

Hydrology
Our next widespread chances for showers and thunderstorms starts
this evening and lasts through Friday night, with lighter rainfall
possibly lingering into Saturday. Areas along and west of a line
from panama city, fl to albany, ga (where soils are most saturated
and more rivers are in action or flood stage) are expected to
receive around 1-3" of rainfall, while areas to the east are likely
to receive closer to around 3-5" of rainfall. With these values,
river flooding is expected to continue in areas still in flood. It
is also likely that these totals will cause additional river
flooding, particularly in the fl big bend and in south central ga.

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 65 60 69 55 65 20 100 90 50 20
panama city 64 61 69 56 62 50 100 80 40 20
dothan 59 56 67 49 59 30 100 80 40 20
albany 61 56 68 53 61 20 100 90 50 20
valdosta 64 58 69 57 65 20 90 90 70 20
cross city 68 61 71 60 68 20 80 90 80 30
apalachicola 64 62 70 57 65 30 100 90 50 20

Tae watches warnings advisories
Fl... None.

Ga... None.

Al... None.

Gm... Small craft advisory from 10 am this morning to 7 pm est
Saturday for coastal waters from ochlockonee river to
apalachicola fl out to 20 nm-coastal waters from mexico
beach to apalachicola fl out 20 nm-coastal waters from
mexico beach to okaloosa walton county line fl out 20 nm-
waters from suwannee river to apalachicola fl from 20 to 60
nm-waters from apalachicola to mexico beach fl from 20 to
60 nm-waters from mexico beach to okaloosa walton county
line fl from 20 to 60 nm.

Near term... Harrigan
short term... Mcd
long term... Mcd
aviation... Harrigan
marine... Mcd
fire weather... Harrigan
hydrology... Nguyen


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SHPF1 - SHP - Shell Point, FL 15 mi73 min NE 2.9 G 5.1 50°F 58°F1022.4 hPa
KTNF1 - Keaton Beach, FL 28 mi67 min NE 1.9 G 2.9 46°F 1022.7 hPa (-1.2)44°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 mi72 minN 010.00 miPartly Cloudy43°F41°F97%1023 hPa

Wind History from 40J (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmSE4S3SE3CalmW4CalmSW5W6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoNW7NW5NW5NW6NW4NW4N6N7N5N4NW7NW5N3NW3NW5CalmNW5CalmW3CalmCalmCalmCalmCalm
2 days agoNW7N4NW6NW5NW9NW5NW9N6N5N7NW8NW5NW6NW3W4NW5N8N4N5NW6NW5NW4NW5W5

Tide / Current Tables for Aucilla River entrance, Florida
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Aucilla River entrance
Click for Map
Thu -- 04:39 AM EST     2.55 feet High Tide
Thu -- 07:23 AM EST     Sunrise
Thu -- 11:53 AM EST     0.25 feet Low Tide
Thu -- 12:00 PM EST     Moonrise
Thu -- 05:37 PM EST     Sunset
Thu -- 06:28 PM EST     2.49 feet High Tide
Thu -- 11:19 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.51.92.32.52.52.421.61.10.60.30.30.40.81.31.82.22.52.52.31.91.61.3

Tide / Current Tables for St. Marks River Entrance, Florida
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St. Marks River Entrance
Click for Map
Thu -- 04:36 AM EST     2.74 feet High Tide
Thu -- 07:23 AM EST     Sunrise
Thu -- 11:48 AM EST     0.28 feet Low Tide
Thu -- 12:00 PM EST     Moonrise
Thu -- 05:37 PM EST     Sunset
Thu -- 06:25 PM EST     2.68 feet High Tide
Thu -- 11:20 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.72.12.52.72.72.52.11.61.10.70.40.30.50.91.422.42.72.62.42.11.71.4

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (3,6,7,8)
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Ground Weather Radar Station Tallahassee, FL
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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.