Tuesday, January16, 2018 L-36.com


Marine Weather and Tides
Larchmont, NY

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:15AMSunset 4:55PM Tuesday January 16, 2018 11:42 PM EST (04:42 UTC) Moonrise 7:49AMMoonset 5:43PM Illumination 0% Phase: New Moon; Moon at 0 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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ANZ335 Long Island Sound West Of New Haven Ct/port Jefferson Ny- 939 Pm Est Tue Jan 16 2018
Overnight..NE winds 5 to 10 kt. Seas 1 ft or less. Slight chance of snow late this evening, then rain with snow likely. Vsby 1 to 3 nm.
Wed..NW winds 5 to 10 kt. Seas 1 ft or less. Rain with snow likely in the morning, then chance of snow and rain in the afternoon. Vsby 1 to 3 nm.
Wed night..NW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Thu..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Thu night..W winds 10 to 15 kt. Seas around 2 ft.
Fri..W winds 10 to 15 kt. Seas around 2 ft.
Fri night..SW winds 10 to 15 kt. Seas 1 ft or less.
Sat..SW winds 10 to 15 kt. Seas 1 ft or less, then around 2 ft in the afternoon.
Sat night..W winds 10 to 15 kt. Seas around 2 ft.
Sun..W winds 5 to 10 kt. Seas 1 to 2 ft in the morning, then 1 ft or less.
Sun night..S winds around 5 kt. Seas 1 ft or less.
ANZ300 939 Pm Est Tue Jan 16 2018
Synopsis for the long island waters and new york harbor.. Low pressure develops along the mid atlantic coast tonight and then passes across or just east of the waters on Wednesday before moving up the coast into the canadian maritimes Wednesday night. High pressure will then build to the south through the rest of the week.

7 Day Forecast for Marine Location Near Larchmont, NY
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location: 40.89, -73.75     debug


Area Discussion for - New York City/Upton, NY
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Fxus61 kokx 170241
afdokx
area forecast discussion
national weather service new york ny
941 pm est Tue jan 16 2018

Synopsis
Low pressure develops along the mid atlantic coast tonight and
then passes near or just east of long island on Wednesday before
moving up the coast into the canadian maritimes Wednesday
night. High pressure will then build to the south through Friday
and move into the western atlantic this weekend. A cold front
then passes through Monday night into Tuesday morning.

Near term until 6 am Wednesday morning
No significant changes were made to the forecast with this
update except to delay precip timing a bit from nyc on east. It
looks like precip will blossom after 06-08z as the upper trough
dynamics interact with the developing secondary low. No changes
were made to the winter weather headlines.

Light snow continues to fall across NW orange county. Starting
to see reflectivity increase as better dynamics begin to move
into this area. Steadier precipitation will continue to
overspread from the west through the night and then blossom
across the rest of the area towards day break.

Have taken an initial look at the 00z nam12, 00z 3-km NAM and
they generally support the current forecast. QPF may be a bit
lower than previous runs, but overall looks close. The latest
hrrr also is in general agreement with the ongoing forecast.

The biggest challenge continues to lie with the northward
extent of the warmer air and how far the rain snow line works.

Despite temperatures currently running a bit cooler than
previously forecast in the nyc metro area, a surge of warmer air
at the surface to just above 925 mb is anticipated. This is due
to a prolonged period of s-se winds ahead of the developing low.

The transition of energy from upper trough weakening primary low
is to the secondary low is slow such that an inverted trough is
expected to extend back into the hudson valley of new york.

This should allow the rain snow line to make it about 10-20
miles north and west of i-95 corridor in new jersey to near or
just south of a line from hpn to dxr.

Temperatures will remain nearly steady overnight and even slowly
rise. Lows will range from the upper 20s in the interior to the
mid 30s along the coast.

Short term 6 am Wednesday morning through Wednesday night
Low pressure near long island in the morning lifts northeast
during the day and up into the canadian maritimes by Wednesday
night. Precipitation shuts down across most of the area by late
morning early afternoon and perhaps ends as period of snow at
the coast. Even if the changeover to snow occurs a bit faster
than indicated in the city at the coast, limited duration of
precipitation on the backside of the low will limit any
accumulation. Highs will top out in the mid to upper 30s with
nw winds developing on the backside of the storm. Gust up to 20
mph develop late in the day and possibly linger into first half
of the night.

Cold air will follow for Wednesday night with lows in the teens
inland and around 20 at the coast. This is slightly below
normal.

Long term Thursday through Tuesday
Surface high pressure will build to our south on Thursday and
Friday. Meanwhile, an upper trough shifts through with some
shortwave energy Thursday night into Friday. Moisture looks
insufficient for any pcpn, so dry weather is expected. Highs a few
degrees below normal for Thursday, returning to near normal on
Friday. Ridging aloft will then keep the weekend dry with warming
temperatures.

Low pressure enters the great lakes region Sunday night, eventually
tracking through quebec on Tuesday. Some warm advection pcpn may
reach some of the northern zones Sunday night into Monday morning,
which could be in the form of a wintry mix. A cold front otherwise
approaches with increasing chances of rain during the afternoon and
night. Some timing differences still exist among the global models
with the cold front passage, so have capped pops at chance through
Tuesday morning. Rain chances otherwise diminish Tuesday afternoon
with dry weather likely returning Tuesday night. Temperatures Sunday
through Tuesday will remain above normal.

Aviation 02z Wednesday through Sunday
A developing coastal low with move north towards the region
overnight, tracking just southeast of long island on Wednesday,
and then into the canadian maritimes by Wednesday evening.

Conditions expected to gradually lower to MVFR this evening, then
lower to ifr late tonight as precipitation develops across region.

Expect all snow at kswf, which may be moderate at times between
06z and 12z. Rain expected to develop for nyc nj terminals after
midnight, likely mixing with snow towards daybreak, and then
briefly changing to all snow Wed morning. Khpn kbdr may see a
mix of rain snow overnight, before changing to all snow towards
daybreak. All rain expected to for kisp kgon. Precip taper off
from W to E Wed morning into early afternoon, with conditions
improving toVFR.

E NE winds less than 10 kt overnight, becoming N nnw towards
daybreak. Winds become wnw with gusts 20 to 25 kt Wed afternoon
continuing into Wed eve push, likely averaging just right of
310 magnetic.

Outlook for 00z Thursday through Sunday
Wednesday night-Thursday Vfr. Wnw winds g20-25kt for Wed eve
push and on Thursday.

Thursday night-Friday Vfr. W-sw winds g20kt possible.

Saturday-Sunday Vfr.

Marine
Sca in effect for the ocean waters as seas remain 4-5 ft. Ocean
seas increase a bit more tonight. Flow returns to a NW direction
and begins to gust late on Wednesday.

Sca conditions continue on the ocean for Thursday through Friday
morning, then sub-advisory conditions are expected for a brief
period Friday afternoon and night. Winds and seas then pick up with
marginal advisory conditions on the ocean during Saturday and
Saturday night. A weaker pressure gradient then returns relatively
tranquil conditions for Sunday.

Hydrology
No significant hydrologic impacts are expected.

Equipment
Nyc NOAA weather radio station kwo-35 (162.55 mhz) is off the
air for an extended period of time.

Okx watches warnings advisories
Ct... Winter weather advisory until 1 pm est Wednesday for
ctz005>008.

Ny... Winter weather advisory until noon est Wednesday for nyz069-
070.

Winter storm warning until noon est Wednesday for nyz067-068.

Nj... Winter weather advisory until noon est Wednesday for njz002-
004-103>105-107.

Marine... Small craft advisory until 6 am est Thursday for anz355.

Small craft advisory until 6 am est Thursday for anz350-353.

Synopsis... Jc dw
near term... Dw ds
short term... Dw ds
long term... Jc
aviation... Nv
marine... Jc dw
hydrology... Jc dw
equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KPTN6 - 8516945 - Kings Point, NY 6 mi43 min NE 1.9 G 2.9 31°F 32°F1028.9 hPa (-1.4)
BATN6 - 8518750 - The Battery, NY 19 mi43 min 36°F 35°F1028.3 hPa (-1.3)
ROBN4 - 8530973 - Robins Reef, NJ 23 mi43 min N 5.1 G 6 35°F 1028.5 hPa (-1.2)
BGNN4 - 8519483 - Bergen Point West Reach, NJ 27 mi43 min 33°F 33°F1027.8 hPa (-1.3)
MHRN6 28 mi43 min NNE 4.1 G 5.1
SDHN4 - 8531680 - Sandy Hook, NJ 32 mi43 min ENE 5.1 G 7 35°F 33°F1028.3 hPa (-1.5)
BRHC3 - 8467150 - Bridgeport, CT 36 mi43 min E 5.1 G 7 35°F 34°F1028.1 hPa (-1.3)
44065 - Entrance to New York Harbor 36 mi53 min E 5.8 G 7.8 42°F 42°F3 ft1027.4 hPa (-1.4)40°F

Wind History for Kings Point, NY
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
New York, La Guardia Airport, NY10 mi52 minNE 510.00 miOvercast33°F28°F85%1027.9 hPa
White Plains - Westchester County Airport, NY13 mi1.8 hrsE 410.00 miOvercast32°F27°F82%1028.9 hPa
New York City, Central Park, NY14 mi52 minNE 310.00 miPartly Cloudy34°F30°F85%1027.8 hPa
New York, Kennedy International Airport, NY16 mi52 minNE 510.00 miOvercast35°F32°F89%1028.2 hPa
Teterboro, Teterboro Airport, NJ16 mi52 minN 510.00 miMostly Cloudy33°F26°F75%1027.9 hPa
Farmingdale - Republic Airport, NY21 mi50 minENE 310.00 miMostly Cloudy35°F32°F89%1028.1 hPa

Wind History from LGA (wind in knots)
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Last 24hrE5NE5E8E5E3E6E6E5NE7E6NE7NE5NE7NE9NE8NE8NE8NE8NE8NE8NE6NE8NE5NE5
1 day agoN11NE11N10N12N10NE10NE16
G21
NE13NE12NE13NE15NE13NE16NE14NE13NE12NE14NE14E12E10NE8E7E9E7
2 days agoNW14
G24
NW19NW14NW13NW15NW14N11N14N10NW13N12N11N13N13N11N15N15
G21
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Tide / Current Tables for Execution Rocks, Long Island Sound, New York
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Execution Rocks
Click for Map
Tue -- 05:07 AM EST     0.45 feet Low Tide
Tue -- 06:48 AM EST     Moonrise
Tue -- 07:16 AM EST     Sunrise
Tue -- 11:14 AM EST     7.61 feet High Tide
Tue -- 04:43 PM EST     Moonset
Tue -- 04:52 PM EST     Sunset
Tue -- 05:41 PM EST     -0.19 feet Low Tide
Tue -- 09:18 PM EST     New Moon
Tue -- 11:43 PM EST     7.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.75.131.50.80.50.82.34.66.47.37.67.46.13.91.80.60-0.10.82.956.46.9

Tide / Current Tables for Throg's Neck, Long Island Sound, New York Current
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Throg's Neck
Click for Map
Tue -- 02:26 AM EST     0.00 knots Slack
Tue -- 05:02 AM EST     0.95 knots Max Flood
Tue -- 06:48 AM EST     Moonrise
Tue -- 07:16 AM EST     Sunrise
Tue -- 08:16 AM EST     -0.00 knots Slack
Tue -- 11:20 AM EST     -0.69 knots Max Ebb
Tue -- 02:30 PM EST     0.00 knots Slack
Tue -- 04:43 PM EST     Moonset
Tue -- 04:53 PM EST     Sunset
Tue -- 05:25 PM EST     0.98 knots Max Flood
Tue -- 08:33 PM EST     -0.00 knots Slack
Tue -- 09:18 PM EST     New Moon
Tue -- 11:43 PM EST     -0.71 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.2-0.10.10.610.70.30.1-0.2-0.5-0.7-0.6-0.3-0.10.10.50.90.90.40.1-0.1-0.4-0.6

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for New York City/Upton, NY (23,6,7,8)
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Ground Weather Radar Station Upton, NY
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weather_mapweather_map weather_map

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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.