Monday, August19, 2019 L-36.com


Marine Weather and Tides
Duck Key, FL

Version 3.4
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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 7:02AMSunset 7:59PM Monday August 19, 2019 12:18 PM EDT (16:18 UTC) Moonrise 9:39PMMoonset 9:19AM Illumination 83% Phase: Waning Gibbous; Moon at 19 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:201908192030;;469391 Fzus52 Kkey 191430 Cwfkey Coastal Waters Forecast For The Florida Keys National Weather Service Key West Fl 1030 Am Edt Mon Aug 19 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>044-192030- 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- 1030 Am Edt Mon Aug 19 2019
.small craft should exercise caution...
This afternoon..Northeast to east winds 15 to 20 knots. Seas 2 to 5 feet. NEarshore waters choppy. Isolated showers and Thunderstorms.
Tonight..East to southeast winds near 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop. Scattered showers and Thunderstorms.
Tuesday and Tuesday night..East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. NEarshore waters a light to moderate chop. Scattered showers and Thunderstorms.
Wednesday..East to southeast winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop. Scattered showers and Thunderstorms.
Wednesday night..East winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop. Scattered showers and Thunderstorms.
Thursday..East winds 10 to 15 knots. Seas 1 to 2 feet. NEarshore waters a light to moderate chop. Scattered showers and Thunderstorms.
Thursday night..Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. NEarshore waters a light to moderate chop. Scattered showers and Thunderstorms.
Friday and Friday night..East to southeast winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop. Scattered showers and Thunderstorms.


7 Day Forecast for Marine Location Near Duck Key, FL
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location: 24.79, -80.88     debug


Area Discussion for - Key West, FL
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Fxus62 kkey 191427
afdkey
area forecast discussion
national weather service key west fl
1027 am edt Mon aug 19 2019

Discussion In the middle and upper levels(700-200 mb), latest
available satellite imagery overlaid with model streamline
analysis as of 900 am, depicts the center of a deep and warm
anticyclone located over northern old mexico with an attendant
east to west oriented ridge extending across the breadth of the
gulf to across central florida. Another middle and upper ridge is
located across the western atlantic near 37n 65w with its
attendant axis extending southwest to just east of north carolina.

South of that a weak nne-ssw aligned (tutt) tropical upper
troposheric trough axis was positioned from the northern bahamas
to across central cuba.

At the surface and in the lower to middle levels(surface to 700
mb), latest available marine and land surface observations and
analysis as of 900 am, details the axis of a 1020 mb surface ridge
from the central atlantic near 30n 55w extending to across
northern florida. Across the tropics, an inverted trough tropical
wave is positioned between eleuthera and andros island. Upstream
of that, another tropical wave is positioned near the mona
passage. Latest sal (saharan air analysis) from university of
wisconsin along with goes-16 tpw as of 12z revealed that the last
vestiges of a drier lower to middle level airmass with pwat
averaging 1.5 inches encompasses much of the keys and immediate
surrounding waters attm, though the leading edge of the near and
plus 2.00 inches of pwat also associated with that wave are
nearing the cay sal bank. The 12z sounding at keyw illustrated
pwat at 1.55 inches, with a moderate to mostly fresh northeast to
east flow from just off the surface up to almost 500 mb, and
plenty of drier air still mixing in from above 850 to 500 mb.

Currently As of 900 am, skies are mostly sunny across the
islands and all surrounding waters. Temperatures across the
islands have already risen into the upper 80s with dewpoints in
the upper 70s. Radar detects just a few quickly moving low topped
showers near the island chain, with isolated showers and
thunderstorms more confined to the aforementioned approaching
higher moisture over the cay sal bank. Available marine platforms
are measuring winds near 15 knots with gusts over 20 knots across
the florida reef and at smith shoal light.

Short term The end of the rare mini-sal induced weather pattern
is coming to an end as the leading edge of deeper moisture and an
associated inverted trough tropical wave approach from the east
during this evening. For today ample middle level drier air will
mix down allowing for only isolated showers and perhaps a
thunderstorm over the islands. The leading edge of a greater
concentration of scattered showers and thunderstorms associated
with the approaching tropical wave will move into the upper
florida keys later in the afternoon spreading eastward during the
evening. The mslp gradient will also remain near breezy to breezy
outside of any convection on account of the differences between
the atlantic ridging and the approaching inverted trough wave.

Given the drier air, lowered rain chances to 20%, isolated for all
of the keys, but a high chance for showers and storms is
indicated for this evening, but will be looking at that more
closely as there are signs that showers may become more numerous,
constituting likely wording for the overnight package, more on
that later.

Marine Will issue scec for all of the florida straits, hawk
channel, and across gmz033-034 thru the afternoon given the
aforementioned gradient. May continue to experience 15 to 20 knots
outside of showers and storms this evening but will revisit that
during the afternoon package. Mariners will likely encounter wind
gusts near or exceeding 25 or 30 knots in any stronger fast moving
showers or thunderstorms.

Aviation The main concern through sunset will be isolated showers
occasionally passing near or possibly over the island terminals.

Showers will be moving to the west at 15-20 knots today, so the
the sub-vfr conditions with any showers should be in and out of
the terminals quickly. Vcsh in the tafs should cover this. Outside
of showers,VFR conditions will prevail. Looking ahead to this
evening, overall shower and thunderstorm coverage will be
increasing.

Key watches warnings advisories
Fl... None.

Gm... None.

Public marine fire... Futterman
aviation nowcasts... .Haner
upper air data collection... ... Bt
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
LONF1 - Long Key, FL 4 mi29 min 86°F 1017 hPa78°F
PKYF1 - Peterson Key, FL 11 mi79 min 88°F
VCAF1 - 8723970 - Vaca Key, FL 13 mi49 min 88°F 89°F1018 hPa
LRKF1 - Little Rabbit Key, FL 14 mi139 min 86°F
SMKF1 - Sombrero Key, FL 17 mi29 min E 15 G 19 86°F 1017.9 hPa77°F
JKYF1 - Johnson Key, FL 18 mi79 min 86°F
BOBF1 - Bob Allen, FL 19 mi79 min 88°F
WRBF1 - Whipray Basin, FL 21 mi79 min ENE 8.9 87°F
MUKF1 - Murray Key, FL 22 mi79 min 87°F
BKYF1 23 mi79 min 86°F
GBTF1 - Garfield Bight, FL 26 mi79 min 88°F
TBYF1 27 mi79 min 87°F
BNKF1 - Butternut Key, FL 28 mi79 min 87°F
LMDF1 - Little Madeira, FL 30 mi79 min 89°F
WWEF1 31 mi139 min 89°F
TRRF1 - Taylor River, FL 32 mi79 min 87°F
LRIF1 34 mi79 min 88°F
DKKF1 - Duck Key, FL 34 mi139 min 88°F
JBYF1 35 mi79 min 89°F
TCVF1 - Trout Cove, FL 35 mi139 min 87°F
BWSF1 - Blackwater Sound, FL 36 mi139 min 87°F
CWAF1 36 mi139 min 87°F
LBSF1 - Little Blackwater, FL 38 mi139 min 88°F
LSNF1 - Long Sound, FL 38 mi79 min 89°F
NRRF1 38 mi79 min 87°F
THRF1 39 mi139 min 89°F
HCEF1 - Highway Creek, FL 40 mi79 min 88°F
SREF1 41 mi79 min 87°F
GBIF1 - Gunboat Island, FL 41 mi79 min 85°F
TPEF1 - Tarpon Bay East, FL 43 mi139 min 86°F
CANF1 - Cane Patch, FL 44 mi79 min 85°F
HREF1 45 mi79 min 85°F
BDVF1 - Broad River, FL 48 mi79 min 86°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, FL10 mi26 minE 10 G 1710.00 miA Few Clouds90°F75°F62%1017.6 hPa

Link to 5 minute data for KMTH

Wind History from MTH (wind in knots)
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Last 24hrE7
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1 day ago5SE65SE5SE6CalmCalmE3E4E5E7E6E6CalmE5E4SE8E4E5E6E6E9E9E10
2 days agoS6SE546SE4SE43CalmSE3SE4SW5W4N4N4CalmSE5S3S5SE5S6S5S6S7S7

Tide / Current Tables for Long Key Channel (West), Florida
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Long Key Channel (West)
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Mon -- 12:12 AM EDT     0.12 feet Low Tide
Mon -- 06:49 AM EDT     1.12 feet High Tide
Mon -- 06:59 AM EDT     Sunrise
Mon -- 10:19 AM EDT     Moonset
Mon -- 12:08 PM EDT     0.25 feet Low Tide
Mon -- 06:48 PM EDT     1.28 feet High Tide
Mon -- 07:54 PM EDT     Sunset
Mon -- 10:38 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.20.30.50.70.91.11.110.80.60.30.30.30.50.70.91.11.21.31.210.70.4

Tide / Current Tables for Long Key Viaduct, Florida Current
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Long Key Viaduct
Click for Map
Mon -- 02:44 AM EDT     -0.00 knots Slack
Mon -- 06:00 AM EDT     -1.19 knots Max Ebb
Mon -- 06:59 AM EDT     Sunrise
Mon -- 09:19 AM EDT     0.00 knots Slack
Mon -- 10:19 AM EDT     Moonset
Mon -- 11:47 AM EDT     0.93 knots Max Flood
Mon -- 02:53 PM EDT     -0.00 knots Slack
Mon -- 06:17 PM EDT     -1.21 knots Max Ebb
Mon -- 07:54 PM EDT     Sunset
Mon -- 09:42 PM EDT     0.00 knots Slack
Mon -- 10:38 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.70.3-0.1-0.6-1-1.2-1.1-0.7-0.20.40.80.90.70.4-0.1-0.5-1-1.2-1.1-0.8-0.40.20.7

Weather Map and Satellite Images
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wmap_A
GOES 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Key West, FL (12,3,4,5)
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Ground Weather Radar Station Key West, FL
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Gulf Stream Current


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Disclaimer:
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.