Saturday, August15, 2020
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Marine Weather and Tides
Marathon, FL

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:00AMSunset 8:02PM Saturday August 15, 2020 4:44 AM EDT (08:44 UTC) Moonrise 2:19AMMoonset 4:24PM Illumination 13% Phase: Waning Crescent; Moon at 26 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:202008151430;;479983 Fzus52 Kkey 150827 Cwfkey Coastal Waters Forecast For The Florida Keys National Weather Service Key West Fl 427 Am Edt Sat Aug 15 2020 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>044-151430- 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- 427 Am Edt Sat Aug 15 2020
Today..East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. NEarshore waters smooth to a light chop. Isolated showers and Thunderstorms.
Tonight..East to southeast winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop. Isolated showers and Thunderstorms.
Sunday and Sunday night..East to southeast winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop. Isolated showers and Thunderstorms.
Monday..Southeast winds near 5 knots. Seas 1 foot or less. NEarshore waters smooth. Isolated showers and Thunderstorms.
Monday night..Variable winds near 5 knots, becoming east to southeast. Seas 1 foot or less. NEarshore waters smooth. Isolated showers and Thunderstorms.
Tuesday..Southeast to south winds near 5 knots. Seas 1 foot or less. NEarshore waters smooth. Scattered showers and isolated Thunderstorms.
Tuesday night through Wednesday night..Southeast to south winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop. Scattered showers and isolated Thunderstorms.


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 150205 AFDKEY

Area Forecast Discussion National Weather Service Key West FL 1005 PM EDT Fri Aug 14 2020

DISCUSSION. Isolated showers dot the coastal waters of the Florida Keys this evening, but the island chain remains mostly dry and muggy with dew points in the upper 70s and temperatures in the mid 80s. GOES-East infrared imagery depicts mostly clear skies along the Keys, but cumulus coverage immediately upstream across the Florida Straits is a little unsettling. Much of the coverage of cumulus across the region can be traced to rain-cooled outflow that originated from a relatively long-lived area of deep convection this afternoon in the vicinity of the Cay Sal Bank. This cluster of convective activity seemed to have activated from a remnant mesoscale convective vortex (MCV) which helped to produce multiple rounds of deep convection over the same surface relative location. In an otherwise unfavorable environment, mesoscale factors came together at the surface (moisture convergence in east-southeast flow) and aloft (TUTT-like cell providing northeasterly shear and storm top divergence). This convective system cycled for several hours, but ultimately gave way to the more suppressed synoptic scale. Cirrus has since drifted south and mostly dissipated, giving a clear view of the aforementioned cumulus boundaries that were strewn across the Middle and Upper Keys.

Concerning the forecast overnight, decided to stick with isolated coverage (20% PoPs) with no changes planned for this update. Of course the lurking MCV is the wild card, but the lack of a convective trigger will likely keep the majority of the area dry. While most guidance is in agreement in keeping convection isolated tomorrow as well, the HREF CAM suite in particular begins to diverge from this solution with a period of scattered showers and thunderstorms possible from early morning to early afternoon. Will let the overnight shift further evaluate this potential.

MARINE. No watches, warnings, or advisories are currently in effect for the coastal waters of the Florida Keys. Newly formed Tropical Storm Kyle well off the New England coast is helping to weaken the ridge axis that extends west from the North Atlantic across the Florida Peninsula, leading to marginally decreased east-southeast breezes. This slackening trend will continue into the weekend as another low pressure system follows behind Kyle and the ridge axis drops south towards the Florida Keys.

AVIATION. VFR conditions are expected to prevail at the island terminals, but a period of vicinity showers and thunderstorms are possible from early morning through early afternoon. Otherwise surface winds veer slightly more southeast and decrease to 5-8 knots.

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



Public/Marine/Fire . WLC Aviation/Nowcasts . WLC Data Acquisition . DR

Visit us on the web at weather.gov/key

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
VCAF1 - 8723970 - Vaca Key, FL 4 mi56 min 1013.9 hPa
SMKF1 - Sombrero Key, FL 8 mi44 min SE 8 G 9.9 84°F 78°F
LONF1 - Long Key, FL 12 mi44 min ESE 8.9 G 12 84°F 1014.1 hPa76°F
PKYF1 - Peterson Key, FL 20 mi104 min 88°F
LRKF1 - Little Rabbit Key, FL 20 mi164 min 88°F
JKYF1 - Johnson Key, FL 23 mi104 min 90°F
MUKF1 - Murray Key, FL 26 mi104 min 89°F
BOBF1 - Bob Allen, FL 28 mi104 min 88°F
WRBF1 - Whipray Basin, FL 28 mi104 min ENE 5.1 89°F
BKYF1 29 mi104 min 88°F
GBTF1 - Garfield Bight, FL 33 mi104 min 90°F
TBYF1 34 mi104 min 91°F
WWEF1 35 mi164 min 89°F
LMDF1 - Little Madeira, FL 37 mi104 min 89°F
BNKF1 - Butternut Key, FL 37 mi104 min 88°F
LRIF1 39 mi104 min 89°F
TRRF1 - Taylor River, FL 39 mi104 min 90°F
CWAF1 39 mi164 min 87°F
NRRF1 42 mi104 min 88°F
DKKF1 - Duck Key, FL 42 mi164 min 89°F
TCVF1 - Trout Cove, FL 43 mi164 min 90°F
SREF1 43 mi104 min 91°F
KYWF1 - 8724580 - Key West, FL 43 mi56 min SE 6 G 8.9 85°F 89°F1014 hPa
JBYF1 43 mi104 min 90°F
BWSF1 - Blackwater Sound, FL 44 mi164 min 89°F
GBIF1 - Gunboat Island, FL 45 mi104 min 90°F
LBSF1 - Little Blackwater, FL 46 mi164 min 90°F
LSNF1 - Long Sound, FL 46 mi104 min 89°F
TPEF1 - Tarpon Bay East, FL 47 mi164 min 88°F
HCEF1 - Highway Creek, FL 48 mi104 min 90°F
MNBF1 48 mi104 min 92°F
HREF1 48 mi104 min 88°F
THRF1 48 mi164 min 90°F
CANF1 - Cane Patch, FL 48 mi104 min 88°F
SANF1 - Sand Key, FL 49 mi44 min ESE 11 G 13 84°F 1014.2 hPa77°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 mi51 minSE 510.00 miPartly Cloudy83°F77°F82%1013.6 hPa

Link to 5 minute data for KMTH

Wind History from MTH (wind in knots)
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2 days agoE6SE6E6E6SE8E6--SE7E6SE8SE9
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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 -- 03:19 AM EDT     Moonrise
Sat -- 06:01 AM EDT     1.85 feet High Tide
Sat -- 06:58 AM EDT     Sunrise
Sat -- 01:52 PM EDT     0.10 feet Low Tide
Sat -- 05:24 PM EDT     Moonset
Sat -- 07:57 PM EDT     Sunset
Sat -- 08:02 PM EDT     1.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.711.31.61.81.81.81.61.310.60.30.10.10.20.40.60.91.11.11.10.90.7

Tide / Current Tables for Moser Channel (swingbridge), Florida Current
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Moser Channel (swingbridge)
Click for Map
Sat -- 01:07 AM EDT     -1.28 knots Max Ebb
Sat -- 03:19 AM EDT     Moonrise
Sat -- 04:18 AM EDT     0.00 knots Slack
Sat -- 06:35 AM EDT     0.73 knots Max Flood
Sat -- 06:59 AM EDT     Sunrise
Sat -- 09:18 AM EDT     -0.00 knots Slack
Sat -- 12:58 PM EDT     -1.92 knots Max Ebb
Sat -- 04:27 PM EDT     0.00 knots Slack
Sat -- 05:24 PM EDT     Moonset
Sat -- 07:39 PM EDT     1.57 knots Max Flood
Sat -- 07:58 PM EDT     Sunset
Sat -- 10:56 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.1-1.3-1.2-0.8-0.20.40.70.70.50.2-0.5-1.2-1.7-1.9-1.7-1.2-0.40.51.21.51.61.30.8-0.1

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 numerous 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.