Saturday, November18, 2017 L-36.com


Marine Weather and Tides
Groton Long Point, CT

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 6:40AMSunset 4:27PM Saturday November 18, 2017 9:09 AM EST (14:09 UTC) Moonrise 7:31AMMoonset 5:59PM Illumination 0% Phase: New Moon; Moon at 29 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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ANZ237 Block Island Sound- 717 Am Est Sat Nov 18 2017
.gale warning in effect from 3 pm est this afternoon through late Sunday night...
Today..SW winds 5 to 10 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt this afternoon. Seas 3 to 5 ft. A slight chance of rain this afternoon.
Tonight..SW winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 45 kt. Seas 7 to 10 ft. Patchy fog. Rain likely. Vsby 1 to 3 nm.
Sun..W winds 20 to 25 kt with gusts up to 45 kt. Seas 8 to 11 ft. Patchy fog. Showers likely. Vsby 1 nm or less.
Sun night..W winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 8 ft.
Mon..W winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft.
Mon night..W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft.
Tue..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft.
Tue night..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. A chance of showers.
Wed..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers.
Wed night..N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
ANZ200 717 Am Est Sat Nov 18 2017
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the waters this morning gives way to intensifying low pres tracking across the saint lawrence river valley Sat night and Sun, with its attending strong cold front sweeping across the new england waters Sun afternoon. Ssw gales ahead of the front and wnw gales behind the front Sun night into Monday. High pres then builds into the waters Tue followed by another cold front moving across new england Wed. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the current hazards link above the map on the left.

7 Day Forecast for Marine Location Near Groton Long Point , CT
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location: 41.3, -71.99     debug


Area Discussion for - New York City/Upton, NY
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Fxus61 kokx 181108
afdokx
area forecast discussion
national weather service new york ny
608 am est Sat nov 18 2017

Synopsis
High pressure builds over the region overnight into early
Saturday. A warm front will lift to the north later Saturday,
then a strong cold front will approach Saturday night, and sweep
sweep eastward Sunday morning as strong low pressure passes to
the north. A few weather disturbances are possible later next
week.

Near term until 6 pm this evening
Forecast is on track. Only some minor adjustments needed to
hourly t TD winds to better reflect current conds and trends.

Ridge axis shifts to the east this morning as a longwave trough
advances through the plains and will reach the midwest ohio
valley by evening. Clouds will rapidly increase this morning,
and models are in good agreement that overrunning rain
associated with an approaching warm front holds off until aftn.

Best chances will be N and W of nyc until late. Southerly winds
will increase as well, but the strongest winds will hold off
until tonight and Sunday.

Waa pattern could result in high temperatures occurring late in
the day or even right before midnight as some location.

Short term 6 pm this evening through Sunday night
Neutral upper trough becomes negatively tilted by Sunday morning
with a vigorous shortwave moving through new england. At the
sfc, low pres in the ohio valley this evening will strengthen as
it tracks through the eastern great lakes and into SE canada
through Sun night. 00z ec has trended a little deeper with the
low but not as deep as the GFS cmc. The NAM is weaker.

Warm front should lift through this eve with increasing S winds
in the low levels. Cold front then approaches from the west with
s-sw winds increasing further and a band of moderate to heavy
showers sweeping across with the front overnight.

Confidence in any wind-related hazards remains higher across eastern
ct and long island, where a wind advisory has been issued for
tonight into Sunday. Given a significant low-level mass
response to the potent upper system, the potential still exists
for strong gusts tonight as a jet (50-60kt at 925 mb)
strengthens across the coast. Naefs suggest low-level jet speeds
significantly stronger than normal for this time of year - in
the 90-98th percentile from 850-700 mb. As previous discussions
have mentioned, questions still remain on how much of these
winds will be able to mix to the surface. However, given the
antecedent dry air mass, saturation may be somewhat slow, and is
supported by SREF probabilities showing only a 25% chance of
ceilings below 3000 ft by 06z sun. Mixing to 3000 ft would
certainly allow gusts perhaps in the range of 50-55kt across
eastern long island and eastern coastal connecticut, especially
after the passage of the warm front. There will be another
chance to mix stronger winds to the surface with the arrival of
any showers convection as the cold front pushes through the
area.

There is also very limited elevated instability across the east
end of LI so have added in the possibility for a rumble of
thunder for a few hours early Sun morning. Otherwise, rain ends
from W to E by late morning early aftn with clearing skies.

Could end up with some bkn clouds from lake effect streamers
well N W of the city, but no pcpn is expected to make it into
the cwa. There is some uncertainty with the timing of the cold
air working in behind the front, but expect falling temperatures
during the aftn.

Winds may briefly abate Sunday morning following the frontal
passage, before strengthening again into the afternoon from the
wnw with the passage of a strong mid- level vorticity maximum.

Confidence in any wind- advisory level sustained speeds gusts
remains highest across eastern ct long island closer to the
departing low. Otherwise, areas farther west will need to be
monitored for possible inclusion in the wind advisory for
Sunday.

Gradient remains tight Sun night with CAA continuing, thus gusty
winds continue.

Long term Monday through Friday
A broad area of high pressure will build into the region Monday
and Tuesday. This will produce fair weather. Superblend was
used for temperatures except for Monday night, where mex was
used to better capture radiational cooling.

Wednesday remains a bit of a question. A cold front will be
approaching from the west. In addition, there remains the
suggestion that some semblance of a coastal low will develop.

The 12z GFS is way off the southeast coast and not a factor. The
12z ECMWF is trending west and now produces a solid swath of
rain across the area. The forecast has been trended towards the
ecmwf, with low chances for precipitation included for all
areas. The rain would help to suppress high temperatures as
well. The cooler superblend was used as a result.

The cold front comes through Wednesday night. The ECMWF is much
different than the gfs, which pours the cold air into the
region. The ECMWF keeps the coldest air locked to the north of
the area, most likely due to the dynamics of the strengthening
offshore low. A blend of the models was used, however depending
on how the pattern ultimately develops, thanksgiving
temperatures could end up being roughly plus or minus 5 degrees
from the current forecast for highs. All solutions are dry for
the day however, followed by a continuation of the dry weather
on Friday.

The GFS does spin up a low along the subtropical jet and tracks
it east of the area on Friday. The ECMWF spins up something
similar on Saturday. This feature will need to be watched for
any westward trend.

Aviation 11z Saturday through Wednesday
High pressure slides east of the region today, with a low pressure
system approaching from the west.

Vfr through this morning, with increasing potential for rain showers
and MVFR or lower conds developing late today into tonight.

Southerly winds increase this morning into this afternoon. SW winds
15 to 20 kt with gusts 25 to 30 kt likely for coastal terminals
late today into this evening.

Outlook for 06z Sunday through Wednesday
Late Saturday night MVFR or lower conditions in -shra. Llws
possible for eastern terminals at night due to SW flow 40-50 kt at 2
kft agl. S-sw winds g25-35kt and occasionally higher for coastal
terminals. Low prob for a band of +shra and isolated thunder.

Sunday Conditions gradually improve toVFR with showers ending by
afternoon. Strong NW windshift Sunday morning, with NW winds g30-
40kt through the day. Gusts diminish to 25-30 kt Sunday evening.

Monday Vfr. W-nw winds g20-30kt. Gusts diminish gradually at
night.

Tuesday MainlyVFR. MVFR possible late Tuesday night with
showers. SW winds g15-20kt.

Wednesday MVFR possible with showers. W-nw winds g15-20kt.

Marine
Tranquil conditions on the seas will be short-lived this
morning prior to strengthening southwesterly winds ahead of a cold
front. Gale-force winds initially on the ocean waters by afternoon
will spread to all other waters as the front nears, with seas
building in response. Overnight, a low level jet is expected to
strengthen along the coast, with the possibility of storm-force
gusts reaching the surface, mainly east of fire island on the ocean
waters. A storm watch remains in effect.

The front passes from west to east tomorrow morning, with a brief
lull in winds before they strengthen again from the wnw. Gale-force
winds will continue into Sunday night, before gradually weakening to
sca-levels. SCA conditions may continue into Tuesday before
gradually weakening into Wednesday and Thursday as high pressure
builds across the area.

Hydrology
A band of moderate to locally heavy showers with a strong cold
frontal passage late tonight into Sunday morning should cause
no more than local nuisance impacts. Total rainfall is expected
to range between 1 2 to 1 inch.

Tides coastal flooding
Water levels will approach minor flood thresholds with this
mornings high tide, but are expected to remain just below.

Storm surge guidance for Sunday morning high tide may to be on
the low side given the strength of southerly winds expected sat
night into Sunday morning ahead of a cold front. But typically,
s SW winds are not conducive to building surge.

There is a low probability of a surge of 1-2 ft Sunday morning.

If these surge levels develop, minor coastal impacts in a
strong SW W flow would be felt mainly across eastern portions of
the great south bay into moriches bay. Elsewhere any impacts
would be brief and localized.

Okx watches warnings advisories
Ct... Wind advisory from 10 pm this evening to 6 pm est Sunday for
ctz010>012.

Ny... Wind advisory from 10 pm this evening to 6 pm est Sunday for
nyz078>081.

Nj... None.

Marine... Gale warning from 6 pm this evening to 6 am est Monday for
anz330-335-338-340-345.

Storm watch from 6 pm est this evening through Sunday morning
for anz350-353.

Gale warning from 1 pm this afternoon to 6 pm est this evening
for anz350-353.

Gale warning from 1 pm this afternoon to 6 am est Monday for
anz355.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 5 mi39 min NNW 4.1 G 5.1 39°F 1014.3 hPa25°F
44039 - Central Long Island Sound 37 mi76 min SW 9.7 G 14 44°F 1 ft
NAXR1 - Narragansett Bay Reserve, RI 42 mi84 min W 1 33°F 995 hPa21°F

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Groton / New London, Groton / New London Airport, CT4 mi73 minNNE 310.00 miFair30°F24°F79%1015.2 hPa
Westerly, Westerly State Airport, RI11 mi76 minN 010.00 miFair30°F23°F75%1015.6 hPa
Montauk, Montauk Airport, NY16 mi75 minVar 3 mi43°F27°F53%1015.6 hPa
Block Island State Airport, RI23 mi73 minWSW 610.00 miFair43°F30°F60%1015.9 hPa

Wind History from GON (wind in knots)
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Last 24hrNW17
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NW7NW7NW11NW10NW6W6CalmW5CalmCalmCalmCalmN4NE4NE4NE3Calm
1 day agoS22SE20CalmSW5SW5W6W4W6NW11
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G28
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2 days agoNE6NE6E6SE8E8SE6SE8E5E5N4N4E9NE8N5N4NE7E6NE5N6SE15S18SE16SE20SE22

Tide / Current Tables for Noank, Mystic River entrance, Connecticut
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Noank
Click for Map
Sat -- 02:44 AM EST     0.25 feet Low Tide
Sat -- 06:30 AM EST     Moonrise
Sat -- 06:40 AM EST     Sunrise
Sat -- 06:42 AM EST     New Moon
Sat -- 08:33 AM EST     2.83 feet High Tide
Sat -- 03:24 PM EST     0.02 feet Low Tide
Sat -- 04:25 PM EST     Sunset
Sat -- 04:59 PM EST     Moonset
Sat -- 09:01 PM EST     2.21 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.80.40.30.61.31.92.42.82.82.52.11.610.40.10.10.61.11.622.22.11.8

Tide / Current Tables for The Race, Long Island Sound, New York Current
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The Race
Click for Map
Sat -- 01:47 AM EST     -2.99 knots Max Ebb
Sat -- 04:56 AM EST     0.00 knots Slack
Sat -- 06:30 AM EST     Moonrise
Sat -- 06:40 AM EST     Sunrise
Sat -- 06:42 AM EST     New Moon
Sat -- 07:48 AM EST     2.89 knots Max Flood
Sat -- 11:04 AM EST     -0.00 knots Slack
Sat -- 02:08 PM EST     -3.42 knots Max Ebb
Sat -- 04:26 PM EST     Sunset
Sat -- 04:59 PM EST     Moonset
Sat -- 05:30 PM EST     0.01 knots Slack
Sat -- 08:16 PM EST     2.75 knots Max Flood
Sat -- 11:35 PM EST     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.6-2.7-3-2.4-1.30.11.62.62.92.51.50.1-1.5-2.8-3.4-3.1-2.2-0.80.82.12.72.61.90.8

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 (9,2,3,4)
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Ground Weather Radar Station Boston, MA
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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.