Saturday, December14, 2019
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Marine Weather and Tides
Marathon, FL

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:01AMSunset 5:41PM Saturday December 14, 2019 4:14 AM EST (09:14 UTC) Moonrise 8:11PMMoonset 9:13AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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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GMZ043 Expires:201912140930;;749658 Fzus52 Kkey 140329 Cwfkey Coastal Waters Forecast For The Florida Keys National Weather Service Key West Fl 1029 Pm Est Fri Dec 13 2019 Florida Bay, Hawk Channel And Straits Of Florida From Ocean Reef To South Of Dry Tortugas, And The Extreme Southeastern Gulf Of Mexico, Including The Florida Keys National Marine Sanctuary Seas Are Given As Significant Wave Height, Which Is The Average Height Of The Highest 1/3 Of The Waves. Individual Waves May Be More Than Twice The Significant Wave Height. Gmz042>044-140930- Hawk Channel From Ocean Reef To Craig Key Out To The Reef- Hawk Channel From Craig Key To West End Of Seven Mile Bridge Out To The Reef- Hawk Channel From West End Of Seven Mile Bridge To Halfmoon Shoal Out To The Reef- 1029 Pm Est Fri Dec 13 2019
Overnight..Southwest winds near 10 knots, increasing to 10 to 15 knots. Seas 1 to 2 feet, building to 1 to 3 feet. NEarshore waters a light chop, becoming a light to moderate chop. Isolated showers.
Saturday..Southwest to west winds 10 to 15 knots, increasing to near 15 knots. Seas 1 to 3 feet, building to 2 to 3 feet. NEarshore waters a light to moderate chop, becoming a moderate chop. Isolated showers.
Saturday night..Northwest winds near 15 knots, becoming north and decreasing to 10 to 15 knots. Seas 1 to 3 feet. NEarshore waters a moderate chop, becoming a light to moderate chop. Isolated showers.
Sunday..Northeast to east winds 10 to 15 knots. Seas 1 to 3 feet. NEarshore waters a light to moderate chop.
Sunday night and Monday..East winds near 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop. Isolated showers.
Monday night..East to southeast winds near 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop. Isolated showers.
Tuesday..Southeast winds 10 to 15 knots. Seas 1 to 3 feet. NEarshore waters a light to moderate chop. Scattered showers.
Tuesday night..Variable winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop. Scattered showers.
Wednesday..North winds increasing to near 20 knots. Seas building to 2 to 4 feet in the afternoon. NEarshore waters becoming rough. Scattered showers.
Wednesday night..Northeast winds near 20 knots. Seas 2 to 4 feet, except 4 to 6 feet west of cosgrove shoal light. NEarshore waters rough. Isolated showers.


7 Day Forecast for Marine Location Near Marathon, FL
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location: 24.73, -81.03     debug


Area Discussion for - Key West, FL
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FXUS62 KKEY 140148 AFDKEY

Area Forecast Discussion National Weather Service Key West FL 848 PM EST Fri Dec 13 2019

DISCUSSION. CURRENTLY. Winds across the Keys have been dead calm or near calm for the past several hours. Key West radar is displaying an area of showers with embedded thunderstorms in the Southeastern Gulf outside of our waters, but otherwise nothing of note. A fairly dry boundary layer was found on the station evening sounding, but no subsidence inversions. Full column PWATs were just over an inch. A fairly dense layer of cirrus can be seen on satellite imagery overhead, with ASOS stations occasionally picking up some CU around 3kft.

SHORT TERM. The showers and storms just outside our Gulf waters are of interest, as they are progressing eastward fairly briskly. However, the genesis of this area is likely a localized convergence line, and may not maintain integrity as it moves towards the east. Otherwise, overall conditions will remain fairly static overnight and up to noon tomorrow.

MARINE. Southwest to westerly light to gentle breezes will persist overnight, and begin to increase to moderate after daybreak on Saturday. Only isolated showers or light rain are expected overnight and through the day on Saturday.

AVIATION. VFR conditions will prevail at both the Key West and Marathon terminals overnight and through noon tomorrow. There is a slight chance of brief passing showers producing temporary MVFR conditions, but given the uncertainly in development will advertise this probability as VCSH in the terminal forecasts. If showers do develop near the terminals, it will most likely be after 06Z. Winds will be mainly out of the southwest to west less than 10 knots.

KEY WATCHES/WARNINGS/ADVISORIES. FL . None. GM . None.

Public/Marine/Fire . Devanas Aviation/Nowcasts . Devanas Data Collection . NB

Visit us on the web at weather.gov/key

Follow us on Facebook and Twitter at: www.facebook.com/nwskeywest www.twitter.com/nwskeywest


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
VCAF1 - 8723970 - Vaca Key, FL 4 mi62 min SW 1.9 G 7 77°F 77°F1011.2 hPa
SMKF1 - Sombrero Key, FL 8 mi34 min SW 14 G 18 78°F 70°F
LRKF1 - Little Rabbit Key, FL 20 mi134 min 77°F
PKYF1 - Peterson Key, FL 20 mi74 min 76°F
JKYF1 - Johnson Key, FL 23 mi74 min 78°F
MUKF1 - Murray Key, FL 26 mi74 min 76°F
WRBF1 - Whipray Basin, FL 28 mi74 min S 8.9 77°F
BOBF1 - Bob Allen, FL 28 mi74 min 77°F
BKYF1 29 mi74 min 76°F
GBTF1 - Garfield Bight, FL 33 mi74 min 76°F
TBYF1 34 mi74 min 77°F
WWEF1 35 mi134 min 76°F
LMDF1 - Little Madeira, FL 37 mi74 min 76°F
TRRF1 - Taylor River, FL 39 mi74 min 76°F
CWAF1 39 mi134 min 76°F
LRIF1 39 mi74 min 77°F
NRRF1 42 mi74 min 75°F
DKKF1 - Duck Key, FL 42 mi134 min 77°F
JBYF1 43 mi74 min 78°F
SREF1 43 mi74 min 74°F
KYWF1 - 8724580 - Key West, FL 43 mi62 min SW 9.9 G 12 78°F 81°F1011.4 hPa
TCVF1 - Trout Cove, FL 43 mi134 min 78°F
BWSF1 - Blackwater Sound, FL 44 mi134 min 76°F
GBIF1 - Gunboat Island, FL 45 mi74 min 75°F
LSNF1 - Long Sound, FL 46 mi74 min 77°F
LBSF1 - Little Blackwater, FL 46 mi134 min 77°F
TPEF1 - Tarpon Bay East, FL 47 mi134 min 75°F
THRF1 48 mi134 min 76°F
HCEF1 - Highway Creek, FL 48 mi74 min 78°F
CANF1 - Cane Patch, FL 48 mi74 min 73°F
HREF1 48 mi74 min 74°F
SANF1 - Sand Key, FL 49 mi34 min SW 15 G 19 78°F 1010.2 hPa72°F

Wind History for Vaca Key, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
The Florida Keys - Marathon International Airport, FL1 mi21 minWSW 610.00 miA Few Clouds77°F69°F77%1011 hPa

Link to 5 minute data for KMTH

Wind History from MTH (wind in knots)
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Last 24hrSE7SE8SE5SE6SE4SE7S4S5S4S5S5SW6SW4W3CalmCalmW3W3S3S7SW7SW8SW9
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Tide / Current Tables for Vaca Key-Fat Deer Key bridge, Florida
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Vaca Key-Fat Deer Key bridge
Click for Map
Sat -- 04:27 AM EST     -0.20 feet Low Tide
Sat -- 07:00 AM EST     Sunrise
Sat -- 09:12 AM EST     Moonset
Sat -- 10:41 AM EST     1.20 feet High Tide
Sat -- 03:39 PM EST     0.38 feet Low Tide
Sat -- 05:37 PM EST     Sunset
Sat -- 08:11 PM EST     Moonrise
Sat -- 09:44 PM EST     2.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.90.40-0.2-0.200.40.711.21.21.10.80.60.40.40.611.41.8221.9

Tide / Current Tables for Moser Channel (swingbridge), Florida Current
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Moser Channel (swingbridge)
Click for Map
Sat -- 12:11 AM EST     -0.00 knots Slack
Sat -- 03:47 AM EST     -2.48 knots Max Ebb
Sat -- 07:00 AM EST     Sunrise
Sat -- 07:14 AM EST     0.00 knots Slack
Sat -- 09:13 AM EST     Moonset
Sat -- 10:06 AM EST     2.10 knots Max Flood
Sat -- 01:41 PM EST     -0.00 knots Slack
Sat -- 04:33 PM EST     -1.84 knots Max Ebb
Sat -- 05:37 PM EST     Sunset
Sat -- 07:49 PM EST     0.00 knots Slack
Sat -- 08:11 PM EST     Moonrise
Sat -- 10:11 PM EST     1.31 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.7-1.6-2.3-2.5-2.1-1.3-0.30.91.72.11.91.40.6-0.3-1.2-1.8-1.8-1.4-0.70.20.91.31.2

Weather Map
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wmap_A
GEOS 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 Key West, FL (4,6,7,8)
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Ground Weather Radar Station Key West, FL
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weather_mapweather_map weather_map

Gulf Stream Current


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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.