Friday, November27, 2020
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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 6:50AMSunset 5:39PM Friday November 27, 2020 6:27 PM EST (23:27 UTC) Moonrise 4:07PMMoonset 4:22AM Illumination 94% Phase: Waxing Gibbous; Moon at 13 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:202011280330;;493759 Fzus52 Kkey 272127 Cwfkey Coastal Waters Forecast For The Florida Keys National Weather Service Key West Fl 427 Pm Est Fri Nov 27 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. Gmz032-035-280330- 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- 427 Pm Est Fri Nov 27 2020
Tonight..Northeast to east winds near 10 knots. Seas around 1 foot. NEarshore waters a light chop.
Saturday..Northeast to east winds decreasing to near 5 knots. Seas 1 foot or less. NEarshore waters becoming smooth. Isolated showers.
Saturday night..Northeast to east winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers.
Sunday..East to southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers.
Sunday night..Southeast to south winds near 10 knots. Seas around 1 foot. NEarshore waters a light chop. Isolated showers.
Monday..South to southwest winds near 10 knots, becoming southwest to west and increasing to 15 to 20 knots. Seas 1 to 2 feet, building to 2 to 3 feet. NEarshore waters a light chop, becoming choppy. Scattered showers.
Monday night..West to northwest winds 15 to 20 knots, becoming northwest to north and increasing to 20 to 25 knots after midnight. Seas 2 to 4 feet. West of the marquesas keys, seas 4 to 6 feet, building to 6 to 7 feet after midnight. NEarshore waters choppy, becoming very rough. Numerous showers and isolated Thunderstorms in the evening, then scattered showers after midnight.
Tuesday..North winds 20 to 25 knots, decreasing to near 20 knots. Seas 2 to 4 feet, except 5 to 7 feet west of the marquesas keys. NEarshore waters rough to very rough. Isolated showers in the morning.
Tuesday night..North to northeast winds near 20 knots. Seas 2 to 3 feet, except 4 to 6 feet west of the marquesas keys. NEarshore waters rough.
Wednesday..Northeast winds 15 to 20 knots. Seas 2 to 3 feet, except 3 to 5 feet west of the marquesas keys. NEarshore waters choppy.
Wednesday night..Northeast to east winds near 20 knots. Seas 2 to 4 feet. NEarshore waters rough. Isolated showers.


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 272019 AFDKEY

Area Forecast Discussion National Weather Service Key West FL 319 PM EST Fri Nov 27 2020

DISCUSSION. A nearly closed cyclone moving east into western Texas has aided in a broad expanse of storms over the southern Mississippi River Valley. Elsewhere across the CONUS, the westerlies are amplified and split. The Florida Keys are separated from this action, dominated by the northern fringes of mean-layer ridging centered over the Western Caribbean and the Yucatan. A late morning ASCAT pass placed the western edge of the low-level ridging over the northeastern Gulf of Mexico, a little farther west than model analyses tend to think. Northeast to east breezes prevail across the island chain, at times shifted to the northeast due to the cooler Bay and Gulf side waters. Temperatures are in the lower 80s with dewpoints in the lower 70s. Skies have been plagued by occasional stratocumulus stuck beneath the formidable subsidence sampled by this morning's KKEY RAOB. Although the island chain has been rain free, patches of drizzle persist within the most vigorous stratocumulus cells.

FORECAST. There are three main forecast challenges for the next seven days: the slim chance for convection ahead of the frontal passage on Monday evening, max and min temperatures Monday through Tuesday morning, and the possible warm front next Thursday night and Friday.

Very few changes to the forecast reasoning tonight through Saturday night as northeast to east breezes remain light to gentle with slim rain chances. Meanwhile, the closed low will lumber to the east and begin to the phase with the polar jet. Cyclogenesis will begin Sunday afternoon over the Mississippi River Valley, with the developing storm system racing northeast through the southern Appalachians Sunday night. A newborn cold front will quickly become orphaned over the Gulf of Mexico on Monday, with cyclonic curvature waning along the front as it approaches the Keys. The polar air mass behind the front will maintain the density surge through the Gulf of Mexico, despite the waning upper level support. There is a short window of weak instability Monday evening ahead of the front, followed by windy and cooler conditions Monday night. Lows Tuesday morning will be tempered by Bay and Gulf side waters in the mid to upper 70s, so we nudged the lows for the island chain up to 65 to 70. Cold air advection should persist through Tuesday with highs struggling through the lower 70s. Dewpoints will crash late Tuesday afternoon to near 50, representing the driest air so far this season. The coldest morning of the two will be Wednesday morning as northeast winds surge off the Mainland, less tempered by the now cooler nearshore waters. We retained Wednesday's lows near 60, with portions of the island chain creeping into the upper 50s. The cooler and drier weather will be short-lived as low pressure forms over the Gulf Thursday night or Friday. Depending on the integrity of this low pressure system, a rather wet warm front could surge back across the Keys by days 6 or 7. For now we held rain chances at 20-30% through the extended.

MARINE. There are no watches, warnings, or advisories currently in effect for the Florida Keys. A Small Craft Advisory likely will be required as early as Monday night behind the next cold front. High pressure will linger over Florida this evening through Saturday night, then sag to the south on Sunday. A low pressure system initially over the northwestern Gulf of Mexico will race to the east-northeast Sunday through Monday. A cold front trailing to the southwest of the developing storm system will plow through the coastal waters of the Florida Keys Monday evening. Strong northerly breezes will follow the frontal passage and continue into Tuesday. Fresh to strong northeast to east breezes will persist through at least Wednesday night.

AVIATION. VFR and gentle northeast to east breezes will prevail at the EYW and MTH terminals this evening.

PRELIMINARY POINT TEMPS/POPS. Key West 70 81 73 81 / 10 10 10 10 Marathon 73 82 73 82 / 10 10 10 10

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

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

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 mi58 min E 5.1 G 6 79°F 77°F1016.4 hPa
SANF1 - Sand Key, FL 20 mi38 min ENE 12 G 13 78°F 1016.5 hPa68°F
42095 25 mi58 min 79°F 80°F2 ft
VCAF1 - 8723970 - Vaca Key, FL 25 mi58 min NE 5.1 G 6 77°F 77°F1016.2 hPa
JKYF1 - Johnson Key, FL 48 mi88 min 78°F
LRKF1 - Little Rabbit Key, FL 48 mi148 min 78°F
MUKF1 - Murray Key, FL 49 mi88 min 78°F
PKYF1 - Peterson Key, FL 49 mi88 min 78°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 mi35 minE 810.00 miA Few Clouds77°F66°F69%1016.1 hPa
Key West International Airport, FL12 mi35 minE 610.00 miFair77°F68°F74%1016.3 hPa

Link to 5 minute data for KNQX

Wind History from NQX (wind in knots)
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Last 24hrNE6NE5NE9E9E10NE7E6NE6NE6NE6E5NE3NE6NE6E7NE10E10E12E9NE7E10E12E10E8
1 day agoE19E12E12E15E15E14E16E17E18E14SE13E12E10E11E12E11E11E10E12E12----E7NE5
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Tide / Current Tables for Key Lois, southeast end, Florida
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Key Lois
Click for Map
Fri -- 01:00 AM EST     0.21 feet Low Tide
Fri -- 04:22 AM EST     Moonset
Fri -- 06:50 AM EST     Sunrise
Fri -- 07:05 AM EST     1.60 feet High Tide
Fri -- 12:40 PM EST     0.50 feet Low Tide
Fri -- 04:06 PM EST     Moonrise
Fri -- 05:36 PM EST     Sunset
Fri -- 06:34 PM EST     2.04 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.30.60.91.21.51.61.51.310.70.50.50.711.41.8221.91.61.20.7

Tide / Current Tables for Key West, Florida Current
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Key West
Click for Map
Fri -- 02:38 AM EST     0.00 knots Slack
Fri -- 04:24 AM EST     Moonset
Fri -- 05:41 AM EST     1.15 knots Max Flood
Fri -- 06:51 AM EST     Sunrise
Fri -- 08:15 AM EST     -0.00 knots Slack
Fri -- 11:33 AM EST     -1.63 knots Max Ebb
Fri -- 03:13 PM EST     0.00 knots Slack
Fri -- 04:07 PM EST     Moonrise
Fri -- 05:38 PM EST     Sunset
Fri -- 05:46 PM EST     0.77 knots Max Flood
Fri -- 07:59 PM EST     -0.00 knots Slack
Fri -- 11:28 PM EST     -1.89 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.6-1.2-0.50.20.81.11.10.90.2-0.6-1.3-1.6-1.6-1.3-0.8-0.10.40.70.80.5-0-0.8-1.5-1.8

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 Key West, FL
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Gulf Stream Current



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