Friday, December6, 2019
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Marine Weather and Tides
Key West, 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 6:56AMSunset 5:39PM Friday December 6, 2019 12:51 AM EST (05:51 UTC) Moonrise 2:19PMMoonset 1:53AM Illumination 68% 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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GMZ044 Expires:201912060930;;919543 Fzus52 Kkey 060337 Cwfkey Coastal Waters Forecast For The Florida Keys National Weather Service Key West Fl 1037 Pm Est Thu Dec 5 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>044-060930- 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- 1037 Pm Est Thu Dec 5 2019
Overnight..Northeast winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop.
Friday..Northeast to east winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop.
Friday night and Saturday..North to northeast winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop.
Saturday night..Northeast to east winds increasing to near 10 knots early. Seas 1 to 2 feet. NEarshore waters becoming a light chop.
Sunday..Northeast to east winds 10 to 15 knots. Seas around 2 feet. NEarshore waters a light to moderate chop. Isolated showers.
Sunday night..Northeast to east winds 10 to 15 knots. Seas around 2 feet. NEarshore waters a light to moderate chop. Isolated showers.
Monday..East to southeast winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop. Isolated showers.
Monday night..East to southeast winds 10 to 15 knots. Seas around 2 feet. NEarshore waters a light to moderate chop. Isolated showers.
Tuesday..East to southeast winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop. Isolated showers.
Tuesday night..East winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop. Isolated showers.


7 Day Forecast for Marine Location Near Key West, FL
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location: 24.55, -82.13     debug


Area Discussion for - Key West, FL
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FXUS62 KKEY 052105 AFDKEY

Area Forecast Discussion National Weather Service Key West FL 405 PM EST Thu Dec 5 2019

DISCUSSION. Water vapor imagery shows a persistent an upper level long wave trough is slowly departing the region. Upstream of this a rather flat and elongated upper level ridge that stretches east to west from the Gulf of Mexico to Baja California. Riding over top of this ridge is the subtropical jet which is moving generally west to east from the West Coast, over the Gulf states, and into the Atlantic. This is evident with the passing cirrus in the skies above the Florida Keys today.

At the surface, a large surface high pressure centered over Georgia and extending from the Great Lakes region to the central Gulf of Mexico, is shifting eastward. This is why our winds have shifted from the northeast and kept our temperatures slightly cooler during the day today and warmer overnight as compared to yesterday. Visible satellite shows the aforementioned cirrus overhead with some patches of strato-cu mainly over the waters west and southwest of the Lower Keys. Key West radar is free of any appreciable precipitation, though a small patch of drizzle or a very light shower persists over the Florida Straits. Otherwise, temperatures didn't fluctuate all that much from this morning. The Lower and Middle Keys are in the lower to mid 70s, while the Upper Keys are in the upper 60s to near 70. Winds are light from the northeast at 5 to 10 mph.

Tonight through Saturday, high pressure over the SE US will move offshore and over the western Atlantic. Behind this surface high, a weak low will transit from Oklahoma southeastward into the Gulf of Mexico and weaken. Aside from occasional weak night surges, the combination of the departing high and incoming weak low will allow for winds to diminish into the early part of the weekend. As this low approaches the Sunshine State, it will bring some moisture with, including the Keys, however it will have become disjointed from any upper level support by this point. As such, could not rule out some isolated showers but given the weak forcing and only a meager increase, could not justify any more than just slight chances (10 percent).

Saturday night, surface high pressure over the Great Lakes will move off the New England coast and expand equatorward. This will increase the pressure gradient over the Florida Keys and lead to a freshening of breezes through at least Monday night. By Tuesday the high will move well offshore in response to a low pressure system exiting the Central Plains and moving into the Great Lakes region. At the mid levels the winds will turn more to the southeast allowing from additional moisture to move in with a slightly better chance at showers, albeit only 20 percent. In addition, the "vacuum" left in the wake of the high, will put us in a col-like regime and winds will slacken. Uncertainty remains high regarding the next potential front. Ensemble models and operational models are not in agreement for whether or not this front will actually make it this far south. Given that both sets of ensembles along with the operational ECMWF hold the front to our north, we have held back on PoPs and wind strength. Both GFS and ECMWF agree of a reinforcing high pressure quickly building across the Lower Mississippi Valley by mid week next week. This in turn would once again tighten the gradient with winds increasing but not to the strength at which previous models were indicating with just the front alone.

MARINE. Gentle northeast breezes tonight will diminish to light to gentle breezes for all waters by Friday night. This will continue through Saturday until high pressure moves off the New England coast and build equatorward towards the Bahamas. This will result in a freshening of breezes from the east. High pressure pushes off to the east Tuesday with winds diminishing. Still a lot of uncertainty with the next front on Wednesday. Regardless winds will freshen once again Wednesday.

AVIATION. A very tranquil weather pattern will result in high-confidence VFR conditions prevailing at both island terminals throughout the rest of this afternoon and evening. Near-surface winds will remain light from the northeast at 6 to 8 knots.

CLIMATE. In 2012, the daily record rainfall of 0.49" was recorded at Key West.

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

Public/Marine/Fire . LIW Aviation/Nowcasts . Chesser Data Collection . Haner

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
42095 13 mi171 min 78°F2 ft
SANF1 - Sand Key, FL 15 mi31 min ENE 11 G 14 70°F 1019.4 hPa61°F
KYWF1 - 8724580 - Key West, FL 17 mi57 min E 2.9 G 7 67°F 78°F1021.1 hPa
PLSF1 - Pulaski Shoal Light, FL 35 mi66 min E 11 G 12 71°F 1020.8 hPa (+0.0)
GKYF1 40 mi171 min 70°F

Wind History for Key West, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Key West International Airport, FL20 mi58 minE 610.00 miPartly Cloudy68°F57°F70%1021 hPa
Key West Naval Air Station, FL23 mi58 minE 810.00 miFair69°F57°F68%1020.8 hPa

Link to 5 minute data for KEYW

Wind History from EYW (wind in knots)
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Last 24hrE3NE3CalmNE3E4E4E3E65E9NE9NE6NE7NE8NE7NE9NE7NE5NE6NE4E4E5E4E6
1 day agoCalmCalmNW6W8W7W8NW13W8NW8N8NW11NW12NW11NW11NW9NW9NW6NW6N4NW5NW4NW4N4NE4
2 days agoNW12NW14
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Tide / Current Tables for Sand Key Lighthouse, Sand Key Channel, Florida (2)
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Sand Key Lighthouse
Click for Map
Fri -- 01:51 AM EST     Moonset
Fri -- 04:18 AM EST     1.29 feet High Tide
Fri -- 06:57 AM EST     Sunrise
Fri -- 10:46 AM EST     0.44 feet Low Tide
Fri -- 02:18 PM EST     Moonrise
Fri -- 04:51 PM EST     1.45 feet High Tide
Fri -- 05:39 PM EST     Sunset
Fri -- 11:34 PM EST     0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.811.21.31.31.210.80.60.50.40.60.811.31.41.41.41.210.70.50.4

Tide / Current Tables for Boca Grande Channel, Florida Current
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Boca Grande Channel
Click for Map
Fri -- 01:52 AM EST     Moonset
Fri -- 02:21 AM EST     0.70 knots Max Flood
Fri -- 05:52 AM EST     -0.00 knots Slack
Fri -- 06:58 AM EST     Sunrise
Fri -- 09:07 AM EST     -0.90 knots Max Ebb
Fri -- 11:52 AM EST     0.00 knots Slack
Fri -- 02:19 PM EST     Moonrise
Fri -- 02:32 PM EST     0.70 knots Max Flood
Fri -- 05:39 PM EST     Sunset
Fri -- 06:00 PM EST     -0.00 knots Slack
Fri -- 09:24 PM EST     -1.06 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.60.70.70.60.3-0.1-0.5-0.8-0.9-0.8-0.50.10.50.70.70.60.4-0-0.5-0.8-1-1-0.7

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 (0,6,7,8)
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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.