Monday, March27, 2017 L-36.com


Marine Weather and Tides
Perryville, AK

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:31AMSunset 8:37PM Monday March 27, 2017 6:39 AM AKDT (14:39 UTC) Moonrise 6:35AMMoonset 6:53PM 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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7 Day Forecast for Marine Location Near Perryville, AK
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location: 55.85, -159.1     debug


Area Discussion for -
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Fxak68 pafc 271230
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
430 am akdt Mon mar 27 2017

Analysis and upper levels
The large upper level over the bering persists with an upper level
low centered around 50n to the south of the eastern aleutians. An
associated frontal system is lifting towards, but remains south
of the eastern aleutians and alaska peninsula. Over mainland
alaska, a broad, cold upper trough extends from the arctic coast
south to an upper low centered over the kenai peninsula and kodiak
island. Precipitation associated with a surface low in the
northern gulf extends across the northern gulf coast and is
pushing into prince william sound.

Model discussion
Models struggle with the finer scale details of the pattern shift
beginning during the first half of this week. Specifically there
are large differences in the handling of the various weak surface
lows moving into and through the gulf. The model uncertainty
likely stems from resolution issues dealing with all of the
small, weak lows and the question of how the low in the
southeastern gulf will interact with the trough swinging into the
western gulf.

By Wednesday models begin converging on a solution of the broader
low complex lifting north into southcentral alaska with model
confidence improving into Thursday regarding the front approaching
the alaska peninsula and western gulf.

Aviation
Panc...VFR conditions and light winds will persist.

Short term forecast southcentral alaska (days 1 and 2)
Today marks the gradual change in the pattern across southcentral.

The upper long wave trough which has been parked across the
southcentral will slowly retrograde westward. This will bring a
shift to a more southerly flow aloft and allow moisture from the
gulf to spread west of the chugach mountains. The first wave
moving west across the gulf today will bring snow to much of the
gulf coast(mixed with rain in a few places along the immediate
coast) and the eastern kenai. Snow showers will likely spread
across the chugach mountains into the anchorage bowl by afternoon,
though western anchorage and the matanuska valley are not
expected to see measurable snowfall at this point. Snow showers
will diminish across southcentral overnight as the low weakens.

Another developing low over the north pacific heads toward the
northern gulf late Tuesday and brings another shot at snow and
rain the gulf and possibly a better change of measurable snowfall
across the anchorage bowl and matanuska valley. However, the
models are differing on the speed and position of this low. So
confidence is low on the timing of precipitation and location.

Short term forecast southwest alaska (days 1 and 2)
Cold and quiet weather continue to be the name of the game across
southwest alaska as northerly offshore flow continues to pump dry
polar air southward across the area. An upper level low and
associated trough currently over the western gulf will gradually
push northwestward into southwest alaska. The center of the upper
level low represents the core of the coldest air. Thus, an
approaching upper level low spells out cooling temperatures.

However, during the day, a good amount of that cooling will be
offset by the strong late march sun, which will remain out in full
force for most areas. The lone exception will be late Monday
night into Tuesday for areas along the alaska range, as mid-level
moisture from a low over southcentral spills over the mountains,
increasing cloud cover. At night, winds in most areas should
average in the 5-10 mph range, keeping full radiational cooling
from taking effect. Falling low temperatures over the next few
nights should be expected, with any sheltered locations having no
trouble dropping below 0.

Short term forecast bering sea/aleutians (days 1 and 2)
A gale-force front parked south of the eastern aleutians will
rapidly weaken during the day today as the parent low retreats
south into the north pacific. The upper-level rex block over the
bering will break down over the next two days and the upper level
high and associated ridging will push south and weaken. The
resulting change in the sensible weather will be fairly benign, as
the pattern of stratus over the central bering becomes more
convective with cold advection. Polar high pressure will persist
over the northern and eastern bering, keeping any threats of
precipitation at nil. The only precipitation to be found once the
front weakens will be in the western bering and aleutians, as weak
upper level lows keep widely scattered showers passing through
that area.

Long term forecast (days 3 through 7)
The only significant change to the long range was to increase the
pops along the north gulf coast and prince william sound into the
copper river basin Tuesday night and Wednesday. A surface low is
moving from the gulf into prince william sound beginning Tuesday
supported by an upper level low. The models continue to hold the
precipitation along and east of the kenai and chugach mountains.

Over the bering sea, aleutians and western alaska we will see a
big pattern change by the middle to end of this week as a large
potent low will move toward the alaska peninsula Thursday and
Friday. The models are in good overall agreement with this
solution through Friday. The latest model run does begin to
converge on this low moving over the southwest mainland Saturday,
although the position and intensity of the low vary a bit. Models
are struggling to converge on a solution for the location and
intensity of a low south of the aleutians. At this point we stuck
with nudging the current forecast toward the ensemble solution
making minor changes to the forecast.

Overall the pattern is shifting and will bring a more active
weather pattern and likely warmer temperatures to the southern
mainland and alaska peninsula.

Afc watches/warnings/advisories
Public... None.

Marine... Gales... 155 172 174.

Heavy freezing spray warning 179 185 414.

Synopsis and model discussion... Jer
southcentral alaska... Bc
southwest alaska/bering sea/aleutians... Jw
long term... Sa


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SNDA2 - 9459450 - Sand Point, AK 82 mi51 min NE 11 G 17 33°F 38°F994.2 hPa

Wind History for Port Moller, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chignik, Chignik Airport, AK50 mi43 minESE 42.50 miLight Snow Fog/Mist29°F26°F89%996.3 hPa

Wind History from AJC (wind in knots)
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Last 24hr--CalmCalmCalmCalmN45NE9NE7NE6NE5NE8--NE8NE7E5NE6NE8NE8NE8NE7NE6E4SE4
1 day ago--S4----CalmCalmN4N5N6N6N6N8E65E5SW3CalmCalmCalmS4--S3CalmCalm
2 days ago--E3--------N4--N6NW4--N6CalmS3S3--Calm----S3--S3Calm--

Tide / Current Tables for Chiachi Island (east side), Alaska
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Chiachi Island (east side)
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Mon -- 02:41 AM AKDT     7.60 feet High Tide
Mon -- 08:18 AM AKDT     Sunrise
Mon -- 08:35 AM AKDT     Moonrise
Mon -- 08:53 AM AKDT     0.22 feet Low Tide
Mon -- 02:48 PM AKDT     8.10 feet High Tide
Mon -- 06:59 PM AKDT     New Moon
Mon -- 08:53 PM AKDT     Moonset
Mon -- 09:05 PM AKDT     Sunset
Mon -- 09:14 PM AKDT     -0.82 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.26.17.47.66.95.53.71.90.60.20.92.44.46.47.78.17.463.91.70-0.8-0.50.9

Tide / Current Tables for Kupreanof Harbor, Paul Island, Alaska
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Kupreanof Harbor
Click for Map
Mon -- 02:38 AM AKDT     7.60 feet High Tide
Mon -- 08:19 AM AKDT     Sunrise
Mon -- 08:36 AM AKDT     Moonrise
Mon -- 08:51 AM AKDT     0.22 feet Low Tide
Mon -- 02:45 PM AKDT     8.10 feet High Tide
Mon -- 06:59 PM AKDT     New Moon
Mon -- 08:54 PM AKDT     Moonset
Mon -- 09:06 PM AKDT     Sunset
Mon -- 09:12 PM AKDT     -0.82 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.36.27.47.56.85.43.61.80.60.20.92.44.56.57.88.17.45.93.81.7-0-0.8-0.41

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
npac_satellite

GOES Local Image of Alaska    EDIT
Geos

Ground Weather Radar Station King Salmon
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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.