Monday, May21, 2018 L-36.com


Marine Weather and Tides
Port Graham, AK

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 4:51AMSunset 11:01PM Monday May 21, 2018 7:06 AM AKDT (15:06 UTC) Moonrise 10:29AMMoonset 1:37AM Illumination 42% Phase: First Quarter Moon; Moon at 7 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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PKZ141 Kachemak Bay- 354 Am Akdt Mon May 21 2018
Today..NE wind 20 kt becoming S 10 kt in the afternoon. Seas 2 ft except 5 ft in the outer bay.
Tonight..Variable wind less than 10 kt. Seas 2 ft.
Tue..Variable wind less than 10 kt becoming sw 15 kt in the afternoon. Seas 2 ft building to 4 ft in the afternoon.
Tue night..S wind 15 kt. Seas 4 ft.
Wed through Thu..E wind 10 kt. Seas 2 ft.
Fri..Variable wind less than 10 kt. Seas 2 ft.

7 Day Forecast for Marine Location Near Port Graham, AK
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location: 59.22, -151.73     debug


Area Discussion for -
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Fxak68 pafc 211256
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
456 am akdt Mon may 21 2018

Analysis and upper levels
The pattern remains much the same as the past few days. A broad
trough over the southern mainland and the gulf of ak continues to
be the dominant weather maker. Several fronts continue to pinwheel
in this cyclonic flow. These are producing plenty of rain along
the gulf coast with widespread cloud cover across just about all
of southcentral ak. Showers are also making it over the kenai and
chugach mountains this morning and clipping stations around the
cook inlet. Showers dissipated over southwest ak earlier last
evening. But with plenty of moisture and light flow, low stratus
and fog have set up shop over the yk-delta.

The jet remains fairly amplified as we move towards late may. It
comes into the domain at 130+ kts supporting a developing surface
low near the western aleutians. It then quickly climbs over a
shortwave ridge in the bering before diving back south to support
the afore mentioned trough over the gulf at 130 kts.

Model discussion
Models remain in rather good agreement in a somewhat stagnant
pattern. The result is moderate to high forecast confidence. There
might be some minor differences on the low the in gulf and
specific timing of its associated fronts. However, this will have
little impact on sensible weather across the area. Instability
will work in tandem with the thermal trough across southwest ak
today to produce some of the best convection of the year so far.

The higher resolution models (nam nest) and some hand edits were
used in handling these features.

Aviation
Panc...VFR conditions will persist. Another bout of southeast
winds should push into the terminal this afternoon and evening.

While timing could be off an hour or two, gusts should top out
near only 20 kts or so.

Short term forecast southcentral alaska (days 1 and 2)
Persistent upper level cyclonic flow continues as the dominate
upper level feature. At the surface a series of surface lows and
accompanying fronts will move north and west across the gulf. The
majority of the rain will fall along the coasts as cross-barrier
flow will keep inland areas under sporadic showers and a little
sunshine at times. A combination a strengthening interior thermal
trough and coastal ridging will generate gusty southerly winds
across west and south anchorage, out of the knik river valley, and
along portions of the copper river during the afternoon and
evening hours through Tuesday. Otherwise, expect gusty easterly
winds along turnagain arm.

Short term forecast southwest alaska (days 1 through 3) the
thermal trough stretched across southwest alaska today will bring
a good potential for isolated to widely scattered thunderstorms
this afternoon and evening. The best chance for thunderstorms
looks to be along and just to the west of the thermal trough axis
stretching from the middle kuskokwim valley south into the greater
bristol bay area extending south to the coast just to the east of
dillingham. With instability diminished on Tuesday precipitation
should remain showers and be more limited in coverage. The same
general pattern will continue on Wednesday, although with inland
shower coverage more isolated and a dissipating frontal system
approaching the coast.

Short term forecast bering sea aleutians (days 1 through 3)
An upper level ridge will track from west to east across the
aleutians and bering today and tonight. A frontal system following
on the upstream side of the ridge will reach the western
aleutians this afternoon and the central aleutians tonight. The
front will slow and shear apart as it continues east Tuesday and
Tuesday night before stalling over the eastern bering and alaska
peninsula Wednesday and then dissipating Wednesday night. The
large vertically stacked parent low will follow, crossing the
western aleutians Tuesday afternoon and then continuing slowly
east to the south central bering through Wednesday night.

Long term forecast (days 3 through 7)
A progressive pattern will continue through next weekend, with an
upper low slowly tracking northward through the gulf through
Thursday morning and another low tracking eastward across the
bering aleutians through Friday. Models remain in fair agreement
with this cooler, cloudier, and unsettled pattern lingering over
much of the area into next weekend.

A triple point low will develop over the gulf along the
approaching front by Thursday, and continue its progression
northward into Friday morning. This system will bring rain and
gusty winds to the surrounding gulf areas as the front pushes
into the coast and further inland by Friday night. The strong
southeasterly flow associated with these systems will favor
slightly drier conditions over the downsloped areas along the lee-
side of the chugach range. Conditions will become more showery
overall and switch to an off-shore flow pattern by Saturday
morning, as the parent low tracks into the eastern gulf through
next weekend.

Out west, the low over the western bering will bring wet and
windy conditions to much of the bering aleutians through Friday,
as it tracks eastward and crosses the akpen into the northern
pacific. High pressure will build into the western bering and
aleutians Friday, and continue to build eastward over much of
the area by Sunday morning.

Afc watches warnings advisories
Public... None.

Marine... Gale warning 119 120 130.

Synopsis and model discussion... Mso
southcentral alaska... Rmc
southwest alaska bering sea aleutians... Jer
long term... Tp


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OVIA2 - 9455500 - Seldovia, AK 15 mi54 min 43°F991.8 hPa
FILA2 - Flat Island Light, AK 16 mi36 min NE 7 G 8 41°F 991.1 hPa41°F
HMRA2 - Kachemak Bay Reserve, AK 31 mi96 min E 8.9 991 hPa
HMSA2 31 mi34 min E 4.1 G 7 46°F 991.5 hPa35°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seldovia, Seldovia Airport, AK15 mi13 minN 010.00 miOvercast42°F39°F89%991.7 hPa

Wind History from ASO (wind in knots)
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Last 24hrCalmS3CalmCalmCalmN9N8N75CalmN6CalmCalmCalmCalmCalmCalmCalmCalmCalmS5CalmCalmCalm
1 day agoCalmCalmCalm3S7S7S85S6S54S5S85CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmS4CalmN33CalmN65CalmCalmCalmCalmCalmCalmCalmSE3S7S5CalmCalmS3Calm

Tide / Current Tables for Port Chatham, Cook Inlet, Alaska
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Port Chatham
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Mon -- 01:02 AM AKDT     3.50 feet Low Tide
Mon -- 03:36 AM AKDT     Moonset
Mon -- 05:21 AM AKDT     Sunrise
Mon -- 07:09 AM AKDT     12.75 feet High Tide
Mon -- 12:28 PM AKDT     Moonrise
Mon -- 01:39 PM AKDT     -0.42 feet Low Tide
Mon -- 07:50 PM AKDT     First Quarter
Mon -- 08:30 PM AKDT     12.43 feet High Tide
Mon -- 10:46 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.33.54.15.8810.211.912.712.210.47.74.51.7-0.1-0.30.93.15.88.61112.312.311.19.2

Tide / Current Tables for Picnic Harbor, Rocky Bay, Alaska
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Picnic Harbor
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Mon -- 12:40 AM AKDT     3.52 feet Low Tide
Mon -- 03:35 AM AKDT     Moonset
Mon -- 05:20 AM AKDT     Sunrise
Mon -- 06:45 AM AKDT     11.84 feet High Tide
Mon -- 12:27 PM AKDT     Moonrise
Mon -- 01:22 PM AKDT     -0.40 feet Low Tide
Mon -- 07:50 PM AKDT     First Quarter
Mon -- 08:26 PM AKDT     11.06 feet High Tide
Mon -- 10:46 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.93.64.86.88.810.511.611.8119.36.73.71.1-0.3-0.11.53.76.18.2101110.99.87.9

Weather Map and Satellite Images
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GOES Local Image of Alaska    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Kenai, AK
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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.