Friday, January22, 2021
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Marine Weather and Tides
Big Coppitt Key, FL

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 Friday January 22, 2021 6:01 PM EST (23:01 UTC) Moonrise 1:13PMMoonset 1:49AM Illumination 71% 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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GMZ035 Expires:202101230330;;328521 Fzus52 Kkey 222122 Cwfkey Coastal Waters Forecast For The Florida Keys National Weather Service Key West Fl 422 Pm Est Fri Jan 22 2021 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. Gmz032-035-230330- Bayside And Gulf Side From Craig Key To West End Of Seven Mile Bridge- Gulf Of Mexico From West End Of Seven Mile Bridge To Halfmoon Shoal Out To 5 Fathoms- 422 Pm Est Fri Jan 22 2021
Tonight..North to northeast winds near 5 knots. Seas less than 1 foot. NEarshore waters smooth.
Saturday..Northeast winds near 5 knots. Seas less than 1 foot. NEarshore waters smooth.
Saturday night..Northeast to east winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop.
Sunday..East to southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop.
Sunday night..East to southeast winds 5 to 10 knots, increasing to near 10 knots. Seas around 1 foot, building to 1 to 2 feet. NEarshore waters smooth to a light chop, becoming a light chop.
Monday..Southeast to south winds 10 to 15 knots. Seas 1 to 2 feet. NEarshore waters a light to moderate chop.
Monday night..Southeast to south winds near 10 knots. Seas around 1 foot. NEarshore waters a light chop.
Tuesday..Southeast to south winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop.
Tuesday night through Wednesday night..East to southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop.


7 Day Forecast for Marine Location Near Big Coppitt Key, FL
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location: 24.55, -81.53     debug


Area Discussion for - Key West, FL
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FXUS62 KKEY 221940 AFDKEY

Area Forecast Discussion National Weather Service Key West FL 240 PM EST Fri Jan 22 2021

DISCUSSION. A squashed mean-layer ridge stretches west across the Caribbean and Central America. Water vapor imagery highlights a broad belt of westerlies across the southern tier of the United States, north of a large area of dry and stable air over the southern Gulf and the Caribbean. A surface ridge axis lingers across the Bahamas, the Florida Keys, and the extreme southeastern Gulf of Mexico. Breezes across the island chain are light, with temperatures in the mid to upper 70s. Skies are mostly sunny, although a thin and emaciated cloud line is draped along the Lower Keys. The KBYX radar is echo free.

FORECAST. The only wild card to the forecast will be the slight chance for patchy fog overnight. Portions of Big Pine fell to 54 this morning with areas of MIFG (thin, elevated fog). Current radar and satellite imagery place a waffling density boundary just south of the Reef. Dewpoints north of the boundary are near 65-67, and we assume the air is a little more moist to the south of the boundary. If this boundary can lift back to the north over the next several hours, then our classic pattern of nocturnal northerlies in combination with radiational cooling would result in some patchy fog along the island chain. There are plenty of ifs with this scenario and fog has not been included in the explicit forecast.

Forecast reasoning has not changed appreciably with this cycle. Mean layer ridging will regain latitude over the next 24-hours or so, setting up camp in the Gulf of Mexico and the southeastern United States. Breezes will become east to southeast Sunday morning, then freshen somewhat as the mean layer ridge supports strengthening of the surface anticyclone over the western North Atlantic. Southeast breezes will peak on Monday near 15 knots, then steadily diminish Monday night and Tuesday. A rogue short wave will punch through the mean layer ridge and dive southeast into the western North Atlantic Thursday and Thursday night. This should open up the polar tap, breaking the stretch of fair weather. This next cold front could be Thursday or Thursday night and will be accompanied by plenty of wind. Through the next four to five days, temperatures will be above normal and rain chances will be near nil. Temperatures will fall below normal after the frontal passage on day six or seven.

MARINE. There are no watches, warnings, or advisories currently in effect for the coastal waters of the Florida Keys. From synopsis, weak high pressure will linger across the Straits of Florida and the Florida Keys tonight and Saturday. A dome of high pressure will slide southeastward off the Carolina coastline Saturday night and reach near Bermuda by Sunday night and Monday. Breezes will freshen Sunday night and will peak on Monday. Breezes will diminish Monday night and Tuesday, and light to gentle breezes are once again expected Tuesday night through Wednesday night.

AVIATION. VFR and light to gentle breezes will prevail at the EYW and MTH terminals this evening. Breezes will tend to the north to northeast after midnight.

CLIMATE. In 1983, a daily record rainfall of 6.42" was recorded, followed by another 5.69" on the 23rd. The next-wettest day ever recorded in January was 3.38" on January 09, 1953. The 12.11" on these two days alone is more rain than fell in the entire 2nd-wettest January ever (8.21" in January 1970). The 6.42" on the 22nd is the wettest day ever between the dates of December 09 and May 29 (still valid as of 2019.) Rainfall records for Key West date back to 1871.

PRELIMINARY POINT TEMPS/POPS. Key West 65 75 67 77 / 0 0 0 0 Marathon 64 77 67 78 / 0 0 0 0

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

Public/Marine/Fire . CLR Aviation/Nowcasts . CLR Data Acquisition . BT

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
KYWF1 - 8724580 - Key West, FL 15 mi43 min NNW 1.9 G 2.9 80°F 71°F1016.4 hPa
SANF1 - Sand Key, FL 20 mi41 min NE 1.9 G 2.9 72°F 1016.4 hPa64°F
42095 25 mi61 min 74°F 77°F1 ft
VCAF1 - 8723970 - Vaca Key, FL 25 mi43 min NNE 1 G 2.9 72°F 72°F1016.2 hPa
JKYF1 - Johnson Key, FL 48 mi61 min 74°F
LRKF1 - Little Rabbit Key, FL 48 mi121 min 75°F
MUKF1 - Murray Key, FL 49 mi61 min 77°F
PKYF1 - Peterson Key, FL 49 mi61 min 71°F

Wind History for Key West, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Key West Naval Air Station, FL9 mi68 minSSE 410.00 miA Few Clouds74°F66°F76%1015.9 hPa
Key West International Airport, FL12 mi68 minSSW 310.00 miFair73°F64°F74%1016.1 hPa

Link to 5 minute data for KNQX

Wind History from NQX (wind in knots)
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Last 24hrNE3NE3NE5NE5NE5NE3NE3NE4NE4NE3E5E4E3CalmN4CalmNE4N4SW36N5N5NW4SE4
1 day agoNE7N5NE5NE4NE5N5N6N8N6N9NE6NE6NE6NE6N5NE6NE7NE9NE8E10E9E9E8E7
2 days agoE9E9NE8NE9NE8NE9NE9NE7NE8NE7NE9NE11--NE6NE9NE8NE10E7N11N14N10NE10N11NE8

Tide / Current Tables for Key Lois, southeast end, Florida
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Key Lois
Click for Map
Fri -- 01:49 AM EST     Moonset
Fri -- 04:07 AM EST     0.82 feet High Tide
Fri -- 07:10 AM EST     Sunrise
Fri -- 09:18 AM EST     0.37 feet Low Tide
Fri -- 01:11 PM EST     Moonrise
Fri -- 03:19 PM EST     1.44 feet High Tide
Fri -- 06:04 PM EST     Sunset
Fri -- 11:18 PM EST     -0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Key West, Florida Current
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Key West
Click for Map
Fri -- 01:50 AM EST     Moonset
Fri -- 02:50 AM EST     0.59 knots Max Flood
Fri -- 05:18 AM EST     -0.00 knots Slack
Fri -- 07:12 AM EST     Sunrise
Fri -- 08:30 AM EST     -1.04 knots Max Ebb
Fri -- 12:44 PM EST     0.00 knots Slack
Fri -- 01:13 PM EST     Moonrise
Fri -- 02:40 PM EST     0.23 knots Max Flood
Fri -- 04:37 PM EST     -0.00 knots Slack
Fri -- 06:05 PM EST     Sunset
Fri -- 08:35 PM EST     -1.43 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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
Ground Weather Radar Station



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.