Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Greenport, NY

Version 3.4
NOTICE
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 6:04AMSunset 7:42PM Wednesday August 21, 2019 7:26 AM EDT (11:26 UTC) Moonrise 10:53PMMoonset 11:41AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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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ANZ340 Peconic And Gardiners Bays- 401 Am Edt Wed Aug 21 2019
Today..S winds 5 to 10 kt. Waves 1 ft or less. Chance of showers. Chance of tstms.
Tonight..SW winds 10 to 15 kt with gusts up to 20 kt. Waves 1 ft or less. Chance of showers. Chance of tstms.
Thu..SW winds 5 to 10 kt. Waves 1 ft or less.
Thu night..W winds 5 to 10 kt, becoming nw after midnight. Waves 1 ft or less. Chance of tstms in the evening. Chance of showers.
Fri..N winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt in the afternoon. Waves 1 ft or less. Chance of showers in the morning.
Fri night..W winds 5 to 10 kt, becoming N after midnight. Waves 1 ft or less.
Sat..NE winds 5 to 10 kt, becoming se in the afternoon. Waves 1 ft or less.
Sat night..SE winds around 5 kt, becoming ne after midnight. Waves 1 ft or less.
Sun..NE winds 10 to 15 kt. Waves 1 ft or less.
Sun night..NE winds around 15 kt. Waves around 2 ft in the evening, then 1 ft or less. Winds and waves higher in and near tstms.
ANZ300 401 Am Edt Wed Aug 21 2019
Synopsis for the long island waters and new york harbor.. A cold front will slowly approach the waters through Thursday, passing Thursday night. High pressure builds in behind the front through the weekend.


7 Day Forecast for Marine Location Near Greenport, NY
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location: 41.1, -72.37     debug


Area Discussion for - New York City/Upton, NY
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Fxus61 kokx 210818
afdokx
area forecast discussion
national weather service new york ny
418 am edt Wed aug 21 2019

Synopsis
A cold front will slowly approach through Thursday. The front
moves across and southeast of the region Thursday night. The
front will move farther southeast of the region Friday into the
weekend as high pressure builds in from the north. Weak low
pressure areas and a frontal system approach early into the
middle next week.

Near term through tonight
Several hazards today. The first is the severe threat, which right
now looks to be focused on the afternoon and evening. Heat and
humidity will result in an unstable airmass, with surface based cape
approaching 3000 j kg at times. Gently falling heights could trigger
activity at any time, but the best focus is after 18z when a
shortwave approaches. This will enhance both lift and shear,
allowing for better organization of cells. The primary threat will
be damaging winds, but 0-1 km EHI in the 1-3 range and veering low
level winds supports an isolated tornado threat. There is also a
hail threat is the best organized storms.

Limiting factors for convection will be any activity prior to the
peak threat time working over the atmosphere or limiting
instability. This is entirely possible with CIN eroding quickly this
morning and falling heights.

The second hazard is heat. Dewpoints are already overperforming,
with islip at 76 this morning. In addition, it does not seem likely
that conditions will improve before the cold front comes through,
which is not until Thu night. Based on this, a heat advisory was
issued for nyc and the adjacent portions of nj and long island. It
is possible that this advisory will need to be expanded based on
what happens today what is expected on thu, as many areas are just
forecast to remain below the 95 degree heat index threshold.

There is the potential that areas in the advisory fall short today
and therefore need to be canceled for thu. Widespread convection
could impact MAX heat indices today.

The third hazard is a high rip current risk. It will primarily be
moderate today, but late this afternoon and evening southerly flow
builds seas to around 5 ft, requiring the issuance of a high risk.

Finally, there is an isolated flash flood risk where the heaviest
storms concentrate. This will likely be near boundaries with storm
motion otherwise east around 10 kt.

The precipitation is expected to wind down from west to east
late this evening as the upper support exits. There could be
some patchy fog late with a residual moist environment.

Short term Thursday
The models have backed off on thunderstorm chances for the bulk of
thu, but with the cold front still on the doorstep, at least slight
chances have been retained, particularly in the afternoon. Dewpoints
are modeled to be a bit lower with more of a westerly component to
the wind. However, the models have been a bit low in general, so as
previously mentioned a more humid forecast has been issued.

There is a moderate rip current risk for thu.

Long term Thursday night through Tuesday
Upper trough moves near and eventually northeast of the region
Thursday night into start of weekend. Upper level ridging moves
across for the weekend into early next week. Solution consistent
between GFS and canadian models but ECMWF model breaks off a piece
of the trough and keeps it near region as weak upper level low for
the weekend. For next week, the ridge eventually moves east of the
region with a weak trough approaching from the west.

At the surface, the cold front will be within the region to start
Thursday night and by Friday morning should be southeast of long
island. The front will continue moving southeast of long island
going into the weekend. GFS and canadian models likewise show a more
steady front movement southeast of long island while ECMWF shows a
little slower movement and closer proximity of low pressure to the
region along the front.

For weather, a continued chance of showers and thunderstorms
Thursday evening but would expect thunder chances to decrease with
the more northerly flow developing behind the front and overall
instability trending downward. Showers chances linger into Friday
morning. Then, dry conditions are forecast for the much of the
weekend. Depending on how low pressure trends along the front to the
south and a frontal system approaching from the west going into
early to middle of next week, there could be a return to rain in the
forecast. Currently, it seems this scenario is more of a low end
possibility, so limited rain to slight chance, with mainly dry
conditions anticipated.

Temperatures overall forecast to be slightly below normal.

Aviation 09z Wednesday through Sunday
A warm front passes this morning. A trough of low pressure develops
this afternoon ahead of an approaching cold front, with showers and
thunderstorms becoming likely.

MainlyVFR this morning, except MVFR or even ifr in patchy stratus,
or an isolated shower or thunderstorm. Coverage of showers and
thunderstorms will increase this afternoon, with MVFR or ifr
possible in any thunderstorm. Thunderstorm chances diminish later
this evening.

Southerly winds will be less than 10 kt early this morning,
with winds light and variable at the outlying terminals. Winds
increase to 10 to around 15 kt late this morning, with gusts to
around 20 kt possible at the nyc terminals during the
afternoon. Winds lighten from the SW this evening.

Ny metro enhanced aviation weather support...

detailed information, including hourly TAF wind component forecasts,
can be found at: http:

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 21 mi41 min E 7 G 8 71°F 69°F
MTKN6 - 8510560 - Montauk, NY 22 mi56 min 74°F 73°F1015.8 hPa
NLNC3 - 8461490 - New London, CT 23 mi56 min NE 1.9 G 1.9 71°F 70°F1015.6 hPa
NWHC3 - 8465705 - New Haven, CT 31 mi56 min E 1.9 G 4.1 75°F 76°F1014.6 hPa
44017 - 23 Nautical Miles Southwest of Montauk Point, NY 33 mi46 min SE 3.9 G 5.8 76°F 1015.8 hPa75°F
BRHC3 - 8467150 - Bridgeport, CT 43 mi62 min Calm G 1 73°F 78°F1014.7 hPa
44069 47 mi56 min SSE 3.9 G 3.9 76°F 80°F76°F

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chester, Chester Airport, CT21 mi31 minN 01.50 miFog/Mist72°F71°F100%1016.3 hPa
The Gabreski Airport, NY23 mi33 minS 31.50 miFog/Mist75°F75°F100%1015.9 hPa
Groton / New London, Groton / New London Airport, CT23 mi30 minN 06.00 miOvercast with Haze75°F70°F84%1015.6 hPa
Montauk, Montauk Airport, NY24 mi32 minN 0 mi75°F73°F96%1016.2 hPa

Link to 5 minute data for KSNC

Wind History from SNC (wind in knots)
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Last 24hrNW3NW4--N7N6N664SW7SW6--SW3CalmS6S5----Calm----Calm----Calm
1 day agoCalmCalm55
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W5------NW4--NW6NW4--Calm
2 days agoCalmS3Calm35W55SW75
G11
S8S7S7S6SW7S6S4CalmS5S4Calm----CalmCalm

Tide / Current Tables for Greenport, Long Island Sound, New York
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Greenport
Click for Map
Wed -- 02:42 AM EDT     2.37 feet High Tide
Wed -- 06:04 AM EDT     Sunrise
Wed -- 09:12 AM EDT     0.61 feet Low Tide
Wed -- 11:41 AM EDT     Moonset
Wed -- 03:12 PM EDT     2.59 feet High Tide
Wed -- 07:39 PM EDT     Sunset
Wed -- 09:52 PM EDT     0.67 feet Low Tide
Wed -- 10:52 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.72.12.32.42.21.81.310.80.60.71.11.72.12.52.62.52.21.81.41.10.80.70.9

Tide / Current Tables for Shinnecock Canal, Railroad Bridge, New York Current
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Shinnecock Canal
Click for Map
Wed -- 01:42 AM EDT     -0.00 knots Slack
Wed -- 04:50 AM EDT     -1.34 knots Max Ebb
Wed -- 06:05 AM EDT     Sunrise
Wed -- 08:32 AM EDT     0.00 knots Slack
Wed -- 11:06 AM EDT     1.23 knots Max Flood
Wed -- 11:41 AM EDT     Moonset
Wed -- 02:14 PM EDT     -0.00 knots Slack
Wed -- 05:20 PM EDT     -1.26 knots Max Ebb
Wed -- 07:39 PM EDT     Sunset
Wed -- 09:10 PM EDT     0.00 knots Slack
Wed -- 10:53 PM EDT     Moonrise
Wed -- 11:28 PM EDT     1.05 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.5-0.2-0.9-1.3-1.3-1.1-0.7-0.20.30.91.21.10.80.2-0.6-1.1-1.2-1.2-0.8-0.5-0.10.51

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for New York City/Upton, NY (7,2,3,4)
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Ground Weather Radar Station Upton, NY
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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.