Tuesday, November21, 2017 L-36.com


Marine Weather and Tides
Greece, 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 7:10AMSunset 4:42PM Tuesday November 21, 2017 5:19 AM EST (10:19 UTC) Moonrise 9:44AMMoonset 7:21PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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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LOZ043 Hamlin Beach To Mexico Bay Along Lake Ontario Including Irondequoit Bay- 631 Pm Est Mon Nov 20 2017
.small craft advisory in effect through Wednesday evening...
Tonight..Southwest winds 10 to 15 knots becoming south 15 to 20 knots. A chance of rain and snow showers early. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet.
Tuesday..South winds 15 to 20 knots becoming southwest. Sunny in the morning, then becoming partly Sunny. Waves 2 to 4 feet building to 3 to 6 feet. Waves occasionally around 7 feet.
Tuesday night..Southwest winds 15 to 20 knots becoming west. Rain showers likely. Waves 3 to 6 feet. Waves occasionally around 7 feet.
Wednesday..West winds 15 to 25 knots becoming northwest. A chance of snow and rain showers in the morning, then a chance of snow showers in the afternoon. Waves 4 to 7 feet. Waves occasionally around 9 feet.
Wednesday night..Northwest winds 15 to 20 knots becoming southwest and diminishing to 10 knots or less overnight. Mostly cloudy. Waves 3 to 6 feet subsiding to 2 feet or less. Waves occasionally around 7 feet.
Thursday..Southwest winds 5 to 15 knots becoming west 15 to 20 knots. A chance of rain showers during the day, then rain and snow showers likely Thursday night. Waves 1 to 3 feet building to 3 to 5 feet. Waves occasionally around 6 feet.
Friday..West winds 5 to 15 knots becoming southwest 15 to 20 knots. A chance of rain and snow showers during the day, then a chance of rain showers Friday night. Waves 2 to 4 feet.
Saturday..Southwest winds 15 to 20 knots becoming northwest. Rain showers likely during the day, then rain and snow showers likely Saturday night. Waves 3 to 6 feet. Waves occasionally around 7 feet. The water temperature off rochester is 49 degrees.
LOZ043 Expires:201711210400;;718753 FZUS51 KBUF 202342 NSHBUF Nearshore Marine Forecast National Weather Service Buffalo NY 631 PM EST Mon Nov 20 2017 For waters within five nautical miles of shore Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. LOZ043-044-210400-

7 Day Forecast for Marine Location Near Greece, NY
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location: 43.29, -77.68     debug


Area Discussion for - Buffalo, NY
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Fxus61 kbuf 210836
afdbuf
area forecast discussion
national weather service buffalo ny
336 am est Tue nov 21 2017

Synopsis
In advance of an approaching cold front... A brisk southwesterly
flow of mild air will dominate our region today... With temperatures
surging back into the lower to mid 50s in most areas. The cold
front will then push across our region tonight... With associated
rain showers mixing with or changing to snow before diminishing
overnight. In the wake of the front... Building high pressure will
then bring a return to colder and mainly dry weather for Wednesday
and thanksgiving day... With just some nuisance-type lake effect
snow showers possible downwind of the lakes at times.

Near term through tonight
Today surface low pressure over central ontario province will push
northeastward into western quebec... While slowly dragging its trailing
cold front in our direction. With our area remaining well out ahead
of the front... We can expect a dry day with fairly plentiful sunshine
this morning merely giving way to some increasing clouds during the
afternoon hours. This said... The tightening pressure gradient in place
out ahead of the cold front will also guarantee the development of
another round of rather breezy to windy conditions... With the strongest
winds found across far wny... Which will lie under an axis of stronger
(40-50 knot) flow in the 925-850 mb layer.

While the low level warm air advection regime will help to prevent
the strongest winds from completely mixing down to the surface... Am
still concerned that at least some 40 knot or so gusts will be able
to make it to the surface between late this morning and early this
afternoon... Particularly with both nam GFS bufkit profiles for kbuf
kiag indicating the presence of 40-45 knot winds as low as 1-2 kft
off the deck and increasingly well mixed lower levels. Given the
prevailing south-southwesterly to southwesterly low level flow... The
greatest overall potential for this will be found across niagara and
northern erie counties... Where a wind advisory has been issued to cover
this possibility. While conditions will also be breezy to windy across
the rest of the region... In general both sustained wind speeds and
gusts should tend to progressively lower with increasing eastward and
southward extent.

Otherwise we can expect a rather mild day today... With the aforementioned
breezy to windy conditions... Expected sunshine... And 925 mb temps of +4c
to +7c all leading to widespread high temps in the lower to mid 50s.

The warmest overall readings will be found across the lower elevations
of the genesee valley and finger lakes where downsloping effects will
be maximized... And where a few spots might see highs reach the upper 50s.

As we move into tonight... The surface low will gradually push further
northeastward across quebec... And in the process will drag its trailing
cold front across our region. While the main surface low will thus remain
far to our north... The boundary will still have the robust support of a
fairly sharp mid level trough to work with... And this combined with low
level convergence and moisture pooling along the boundary should be more
than sufficient to generate a fairly solid band of rain showers as the
front crosses our region... For which pops have been bumped up into the
categorical range areawide. In the wake of the frontal passage... Modest
cold air advection will then lead to the synoptic precipitation briefly
mixing with or changing over to wet snow before diminishing overnight...

while some limited lake effect snow showers also develop southeast of
the lakes in the developing northwest flow regime. This changeover to
snow could potentially lead to some minor accums of an inch or less
across the higher terrain... With little or no accumulation expected
across the lower elevations. As for temps... The cold advection regime
behind the front will result in readings falling back to the upper 20s
to mid 30s by the end of the night.

Short term Wednesday through Friday night
Not only will uneventful weather dominate this period... But we can
also look forward to gradual day to day warming. This... Despite a
pattern that will feature ridging in the west and an oscillating
trough over the great lakes region. These are both favorable
ingredients for thanksgiving travelers... But the good news will not
last through the upcoming weekend. More on this in the long term
section found below.

Notably colder air in the wake of a cold front will pour across our
region on Wednesday. Temperatures will be some 15 to 20 degrees
lower than the day before... With the mercury not climbing out of the
30s. The cold air will support some lake effect snow southeast of
both lakes... Especially during the morning when synoptic moisture
will be the most plentiful and the cap will be at its highest for
the day... Around 8k ft. Even so... The lake response will be minimal
with snowfall only forecast to be an inch or so for the chautauqua
ridge and in the vcnty of the tug hill. Otherwise... Clouds will
gradually thin out during the course of the day while winds gusting
between 25 and 30 mph will keep wind chill values in the 20s.

The axis of a large... Elongated surface based ridge will cross our
forecast area Wednesday night. While this will provide our region
with fair dry weather... Cirrus streaming in from the west should
temper an otherwise favorable environment for radiational cooling.

The only thing we will have to watch for will be some very minor
lake snow showers that could develop northeast of the lakes towards
daybreak. A low cap of about 5k ft will severely limit any real
development though.

On thanksgiving... The surface high will push east and this will
initiate a warm advective pattern for our forecast area. While a
weak mid level shortwave will cross our region... The surface based
high should remain the dominant feature. Will thus keep the majority
of the region pcpn free for Thursday... With the exception again
coming northeast of the lakes where some nuisance light lake driven
snow showers will be possible. Will just use low chc pops for this.

A stronger shortwave will pass by further to our north Thursday
night. While this will push a weakening frontal boundary as far
south as lake ontario... While low level ridging will persist over
the western counties. Will thus back off on chc pops for the western
counties and only maintain the chc for snow showers over the eastern
lake ontario region.

As a flat shortwave ridge pushes across the lower great lakes on
Friday... It will force the remnants of the stalled frontal boundary
back into canada. This will also establish another brief warm up...

as a strengthening south-southwest flow ahead of an approaching
pacific based cold front will boost h85 temps from the minus single
digits c to around 5c. Our temperatures will respond by climbing
into the 40s in most areas by Friday afternoon. The moderating
temperatures will be accompanied by at least partial sunshine.

Conditions will then deteriorate somewhat Friday night... As a
vigorous shortwave will push the first of two frontal boundaries
across our region. The first one... A pacific based cold front...

will push through our region late Friday night. This feature should
generate some mixed rain and snow showers... Mainly over the western
counties after midnight.

Long term Saturday through Monday
While temperatures will actually be on the plus side of normal to
start this period... A digging longwave trough over the great lakes
will unlock the door for a chunk of very cold air to settle over us
for Sunday and Monday. As one would expect for this time of year...

the plunging temperatures will support some lake snows as well. This
will likely present some problems for holiday travelers at the end
of the weekend. More on this in a moment.

Saturday will be somewhat unsettled across our region... But it will
be far from a wash out. In fact... There may be more hours of pcpn
free weather than those with mixed rain and snow showers. The
pacific based cool front will pass to our east during the morning...

and this should leave a lull in the synoptic forcing for the
afternoon. As the cold air behind the first front deepens though...

any residual rain showers should mix with change to wet snow
showers.

A fairly strong arctic cold front will then plow across the lower
great lakes Saturday night. This will generate scattered snow showers
throughout our region... With lake snows becoming organized southeast
of the lakes after midnight. The stage will then be set for what
could be a miserable day for travel on Sunday.

Medium range ensembles are in good agreement that a cold cyclonic
northerly flow will be in place over our region on Sunday... While
fairly deep synoptic moisture will persist. Given that h85 temps are
forecast to be in the vcnty of -12 to -15c and that there should be
some added lift from the northerly upslope flow... It is likely that
fairly steady snow will be found southeast of both lakes... Including
along the bulk of the new york state thruway. This could make travel
a little more challenging for those heading home Sunday and Sunday
night. Stay tuned.

On Monday... A broad ridge over the mid west and upper great lakes
will begin to push across the lower great lakes. The ensuing warm
advection and subsequent lowering subsidence inversion will bring an
end to the accumulating... Problematic lake snows southeast of both
lakes... While fair weather will be found elsewhere.

Aviation 09z Tuesday through Saturday
WidespreadVFR conditions will continue right through today... With
patchy thin high cirrus for much of this morning gradually giving
way to increasing thickening clouds this afternoon as a cold front
slowly presses in our direction from the upper great lakes. This
said... A strengthening low level jet will also help to generate
fairly widespread low level wind shear across the region into this
morning... Before increasing daytime mixing relaxes the wind shear
and allows some of the stronger winds from aloft to mix to the
surface... Resulting in breezy to windy surface conditions. The
windiest overall conditions today will be found in the vicinity of
kbuf kiag... Where a period of surface wind gusts to around 40 knots
or so can be expected during the late morning and early afternoon
hours.

Tonight the aforementioned cold front will push across our region
from west to east along with a band of fairly widespread rain
showers... Which will briefly mix with or changeover to snow showers
before diminishing overnight. This will result in flight conditions
lowering to MVFR... With embedded pockets of ifr possible.

Outlook...

Wednesday... MainlyVFR... With a chance of localized MVFR ifr in
scattered snow showers southeast of the lakes.

Thursday... MainlyVFR... With a chance of localized MVFR in
scattered snow showers north-northeast of the lakes.

Thursday night... A chance of snow showers MVFR across the north
country... Otherwise mainlyVFR.

Friday... MainlyVFR.

Saturday...VFR MVFR with rain showers likely.

Marine
Out ahead of an approaching cold front... Rather brisk southwesterlies
will continue across the lower great lakes today... Before veering
to northwesterly tonight following the frontal passage... Then slowly
diminishing from west to east during Wednesday as high pressure
builds across the region. As such... Small craft advisories remain
in effect as outlined below.

Looking a bit further out in time... Some additional small craft
advisories may be needed again for Thursday afternoon and night as the
pressure gradient tightens around a cold front passing by just to our
north... With more widespread advisories then possible this weekend as
a stronger low pressure system passes by to our north.

Buf watches warnings advisories
Ny... Wind advisory from 9 am this morning to 5 pm est this
afternoon for nyz001-010.

Marine... Small craft advisory until 7 pm est this evening for lez020.

Small craft advisory until 1 pm est Wednesday for lez040-
041.

Small craft advisory until 7 pm est this evening for
loz030.

Small craft advisory until 7 pm est Wednesday for
loz042>045.

Synopsis... Jjr
near term... Jjr
short term... Rsh
long term... Rsh
aviation... Jjr
marine... Jjr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCRN6 - 9052058 - Rochester, NY 3 mi49 min 41°F 1010.1 hPa
RPRN6 - Rochester, NY 5 mi79 min SSW 17 G 25 43°F 1010.8 hPa (-1.7)
45012 - Lake Ontario Buoy - 20NM North Northeast of Rochester, NY 27 mi89 min S 18 G 19 45°F 48°F3 ft1010 hPa (-1.2)
OLCN6 - Olcott Harbor, NY 55 mi79 min S 8 G 17 43°F 1010.2 hPa (-1.0)

Wind History for Oswego, NY
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NW9
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SW17
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G35
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W26
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NW28
G34
W32
G39
NW31
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G35
NW29
NW26
G33
NW26
NW23
G29
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NW25
G34
W28
G37
W23
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NW25
G31
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G33
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G29
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G38
NW31
W28
G41
W31
G44
NW30
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NW21
G27
NW18
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NW13
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2 days
ago
S17
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SE12
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G18
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G15
SE9
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G18
SE9
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G15
S12
G18
S13
G24
S9
G18
SW14
G21
NW32

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rochester, Greater Rochester International Airport, NY12 mi25 minSW 1310.00 miFair41°F23°F49%1011.1 hPa

Wind History from ROC (wind in knots)
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Last 24hrW13
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W12SW9W9SW5W16
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SW6S7SW8SW9SW12SW8SW11
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1 day agoNW19
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W12W11
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NW10W7NW10NW8
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W10W9W9NW9NW15
G24
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W11W10W6W13
G22
W14
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W16
G24
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G23
2 days agoS3S5SE7S4SW6SW8SW12
G17
SW9SW9S8S6SE5SE6SE9SE7SE6E5SE4S7SW7SW11NW21
G27
NW18
G30
NW17
G21

Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of Northeast    EDIT
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Wind Forecast for Buffalo, NY (5,6,7,8)
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Ground Weather Radar Station Buffalo, 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.