Thursday, January23, 2020
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Marine Weather and Tides
Key West, 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 7:10AMSunset 6:06PM Thursday January 23, 2020 8:51 AM EST (13:51 UTC) Moonrise 6:16AMMoonset 5:09PM Illumination 3% Phase: Waning Crescent; Moon at 28 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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GMZ075 Expires:202001231600;;391331 Fzus52 Kkey 231301 Cwfkey Coastal Waters Forecast For The Florida Keys National Weather Service Key West Fl 801 Am Est Thu Jan 23 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. Gmz054-055-074-075-231600- Straits Of Florida From West End Of Seven Mile Bridge To South Of Halfmoon Shoal Out 20 Nm- Straits Of Florida From Halfmoon Shoal To 20 Nm West Of Dry Tortugas Out 20 Nm- Straits Of Florida From West End Of Seven Mile Bridge To South Of Halfmoon Shoal 20 To 60 Nm Out- Straits Of Florida From Halfmoon Shoal To 20 Nm West Of Dry Tortugas 20 To 60 Nm Out- 801 Am Est Thu Jan 23 2020
Today..Northeast to east winds near 15 knots. Seas 3 to 5 feet. Scattered showers.
Tonight..East to southeast winds 10 to 15 knots. Seas 2 to 4 feet. Scattered showers.
Friday..Southeast to south winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers.
Friday night..Southeast to south winds 5 to 10 knots, becoming north in the late evening and overnight. Seas 1 to 2 feet. Isolated showers.
Saturday..North to northeast winds near 10 knots. Seas 1 to 3 feet. Scattered showers.
Saturday night..North to northeast winds 10 to 15 knots. Seas 2 to 4 feet. Isolated showers.
Sunday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet. Isolated showers.
Sunday night..Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Isolated showers.
Monday..South to southwest winds 10 to 15 knots, becoming west. Seas 2 to 4 feet. Scattered showers.
Monday night..West to northwest winds 10 to 15 knots, becoming northeast. Seas 2 to 4 feet. Scattered 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 230942 AFDKEY

Area Forecast Discussion National Weather Service Key West FL 442 AM EST Thu Jan 23 2020

DISCUSSION. Currently - A high pressure cell is aligned along the Atlantic states while a low pressure system is centered well northeast of the Bahamas. Winds have relaxed substantially over the past 12 hours and are now moderate and quite diffluent, with northeasterlies to our west and northwesterlies to our east. The flow above a shallow decoupled boundary layer remains robust, and are now out of the east northeast. Surface moisture has increased quite dramatically, rising around 18 degrees from 40 to 58 since yesterday morning. This rapid dew point rise is a side effect of the low off the Bahamas. With temperatures hovering near 60, there are multiple swaths of very low stratus and patch fog invading the Keys. In addition to this, the sharply veering flow is also generating scattered to broken stratocumulus between 3000 and 6000 ft. Embedded scattered showers are also present, however, they remain mostly over the Florida Straits.

Forecast - Through the next 24 hours, the low will shuttle fairly rapidly further out to the northeast and the high along the east coast will expand eastward into the Atlantic, even as it weakens. As a result, surface winds will try to veer easterly. However, it will take some time for our gulf and bay waters to warm up and allow the veering to occur. The fog and low stratus should burn off by the afternoon. Expect temperatures to struggle to pass above 70 degrees for most island locations. Dew points will continue to climb as temperatures do and will likely be in the lower to mid 60s by the end of the day. There will be a slight chance for showers, rain more like, as patches of rain carrying stratocumulus advect westward from the gulf stream towards the Keys. Expect near normal overnight low temperatures.

Expect the local pressure gradient to collapse on Friday as the ridge becomes positioned to our northeast and the next mid latitude low pushes a trough down through the southeast and into Florida. Day time highs will be highly dependent on wind direction, likely being northerly to the west, and east to southeast to the east. Will retain slight chance for showers due to the ample moisture and sufficient head room for weak shower formation. Temperatures will remain near to slightly above normal as there is no strong thermal advection taking place.

A weak, mostly dry cold front will descend through the Keys on Saturday. However, there is virtually no cool air push and the ensuing northerly flow strengthens only moderately. Temperatures will fall only a few degrees, hovering near or slightly below normals. Rain chances will be slight at best, favoring early in the day. Winds will then clock northeast then east through the weekend as the following high pushes southeastward into the southeastern United States.

All guidance suggests a strong southern stream jet streak will ride eastward through the south and Gulf of Mexico, reaching our longitude sometime around Monday. Associated lower level troughing, height falls and increasing deep layered moisture should result in the formation of an eastward propagating surface low. Rain chances and possible thunderstorms will certainly increase in the Monday time frame along with an overall increasing and rapidly veering surface flow. This is a bit far out to get too far into the details yet.

MARINE. Winds have finally fallen below Small Craft Advisory criteria across much of our waters. The advisory will be lowered for the majority of our waters this morning. The eastern straits Advisory will remain due to a residual swell. The low pressure system that was near the Bahamas will continue to race off to the northeast over the next couple of days. Meanwhile, a high over the Atlantic states will spread eastward into the Atlantic. As a result, local winds will continue to gradually weaken and try to veer easterly. Cold waters to our north will delay the veering onset some, but at some point they are expected to turn, likely on Friday. Winds will collapse on Saturday as the high moves off to the east and troughing develops to our north. While the trough will not reach the Keys an associated weak cold front will push through the area resulting in a moderate strengthening of northerly breezes. Winds will quickly clock around on Sunday as the following high gives way to a developing Gulf of Mexico low. Uncertainty remains fairly high regarding this system. Stay tuned.

AVIATION. IFR/LIFR ceilings will prevail at the island terminals this morning, eventually lifting and scattering out around mid-day. Chances for showers remain negligible with surface winds attempting to veer east this afternoon, but likely staying backed to at least ENE.

PRELIMINARY POINT TEMPS/POPS. Key West 73 66 76 67 / 20 20 20 20 Marathon 73 66 77 66 / 20 20 20 20

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



Public/Marine/Fire . 11 Aviation/Nowcasts . WLC

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 mi82 min 76°F2 ft
SANF1 - Sand Key, FL 15 mi42 min NNE 9.9 G 12 64°F 61°F
KYWF1 - 8724580 - Key West, FL 17 mi58 min 62°F 69°F1017.1 hPa
PLSF1 - Pulaski Shoal Light, FL 35 mi67 min E 11 G 12 66°F 1017.3 hPa (+1.1)
GKYF1 40 mi112 min 65°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 mi59 minNNE 710.00 miOvercast63°F60°F90%1017.1 hPa
Key West Naval Air Station, FL23 mi59 minNNE 610.00 miOvercast63°F59°F87%1016.8 hPa

Link to 5 minute data for KEYW

Wind History from EYW (wind in knots)
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Tide / Current Tables for Sand Key Lighthouse, Sand Key Channel, Florida
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Sand Key Lighthouse
Click for Map
Thu -- 02:10 AM EST     -0.47 feet Low Tide
Thu -- 06:14 AM EST     Moonrise
Thu -- 07:12 AM EST     Sunrise
Thu -- 08:57 AM EST     0.81 feet High Tide
Thu -- 01:18 PM EST     0.22 feet Low Tide
Thu -- 05:07 PM EST     Moonset
Thu -- 06:06 PM EST     Sunset
Thu -- 07:55 PM EST     1.69 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0-0.3-0.5-0.4-0.20.10.30.60.70.80.70.60.40.20.30.50.81.11.41.61.71.61.30.9

Tide / Current Tables for Boca Grande Channel, Florida Current
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Boca Grande Channel
Click for Map
Thu -- 02:48 AM EST     0.00 knots Slack
Thu -- 06:15 AM EST     Moonrise
Thu -- 06:17 AM EST     1.39 knots Max Flood
Thu -- 07:13 AM EST     Sunrise
Thu -- 09:37 AM EST     -0.00 knots Slack
Thu -- 12:31 PM EST     -1.16 knots Max Ebb
Thu -- 03:15 PM EST     0.00 knots Slack
Thu -- 05:08 PM EST     Moonset
Thu -- 05:59 PM EST     0.86 knots Max Flood
Thu -- 06:06 PM EST     Sunset
Thu -- 08:54 PM EST     -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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-1.6-1.3-0.60.20.81.21.41.310.4-0.2-0.8-1.1-1.1-0.8-0.20.40.80.90.80.5-0.1-0.7-1.2

Weather Map
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wmap_A
GEOS Local Image of Southeast    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 (8,2,3,4)
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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.