Friday, December15, 2017 L-36.com


Marine Weather and Tides
Cordova, AK

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 10:07AMSunset 3:43PM Friday December 15, 2017 6:29 PM AKST (03:29 UTC) Moonrise 6:26AMMoonset 3:00PM Illumination 5% Phase: Waning Crescent; Moon at 27 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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PKZ126 Port Valdez- 320 Pm Akst Fri Dec 15 2017
Tonight..Variable wind less than 10 kt. Seas 2 ft. Rain and snow.
Sat..Variable wind less than 10 kt. Seas 2 ft. Rain showers with snow showers.
Sat night..Variable wind less than 10 kt. Seas 2 ft. Snow showers.
Sun..NE wind 10 kt. Seas 2 ft.
Sun night..NE wind 15 kt. Seas 3 ft.
Mon..NE wind 15 kt. Seas 3 ft.
Tue..NE wind 10 kt. Seas 2 ft.
Wed..Variable wind less than 10 kt. Seas 2 ft.

7 Day Forecast for Marine Location Near Cordova, AK
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location: 60.38, -145.4     debug


Area Discussion for -
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Fxak68 pafc 160146
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
446 pm akst Fri dec 15 2017

Analysis and upper levels
The atmosphere is becoming more dynamic again across southcentral
as a large bering low shifts east along a very difluent upper
level north pacific jet stream which is steamrolling northeast
into the gulf of alaska. A solid gale force (40 knots) front
associated with the aforementioned upper level jet was captured
moving across kodiak into the western gulf of alaska at noon. This
has already brought over an inch of rain to parts of kodiak
island, and this rain will quickly spread north toward the gulf
coast later today. Over the bering sea, there is a well-defined
occluded low moving north across bristol bay toward nunivak
island. This is bringing strong gale force winds and rain snow to
most of the southwest coast. There is another closed low center
just north of adak island supporting another region of gale force
winds.

Model discussion
The numerical models have now come into great agreement with the
strong front moving toward the north gulf coast this evening. Over
the past few days, there was quite a lot of disagreement among
the models with the potential for a closed low along the coast.

Some models (mostly the gfs) were very strong with the closed low
scenario whereas the ECMWF and canadian were faster and had more
of a trough axis instead of a closed low... Which also featured a
meso low moving north through cook inlet. Now all models are in
agreement with the latter solution, so winds are now expected to
come down through prince william sound, down passage canal, and
then down turnagain arm. Some winds will also come through
anchorage from the southeast overnight as the front passes
through. In terms of precipitation, the regime is expected to
become showery behind the front given the rather impressive
instability, so models are not in good agreement with that and are
expected to remain so for the next couple days.

Aviation
Panc... A front approaching the coast will bring threats for
flurries and possibly a little light rain this evening and early
tonight. After the front passes some southeast winds are expected
to impact the terminal with the chance for a mix of rain and snow
which may drop CIGS vis to MVFR for a brief time. After that,
expect snow shower chances through the day Saturday as unstable
air moves over the terminal.

Short term forecast southcentral alaska (days 1 and 2)
The strong front is pushing in to the gulf of alaska with a triple
point low starting to form south of kodiak island. A short wave is
ejecting out of the base of the low now over the alaska peninsula
heading toward shelikof strait then up cook inlet tonight. Rain
will spread from kodiak east into prince william sound this
evening and mix with or change to snow in the northern sound and
especially the higher elevations tonight. The short wave rapidly
moving up the inlet will complicate the forecast, particularly
the wind. The turnagain arm and hillside wind should be
problematic. The current model solutions don't capture the
magnitude of the current wind, we're also concerned about another
shot of wind associated with the shortwave that is not captured
well overnight into tomorrow morning. We're still anticipating the
typical downslope drying across the coastal mountains as the
front moves through and with the strong wind again overnight and
tomorrow. Another concern is how much precipitation makes it into
the copper river basin. At this point it looks like the downslope
drying across the chugach should prevent snow in glennallen but
expect snow along the alaska range and talkeetna mountains in the
upslope flow. The susitna valley, once the flow becomes southerly,
should see a shot of snow along the alaska range and north of
talkeetna, though not heavy.

Short term forecast southwest alaska (days 1 and 2)
A strong low continues to move up the kuskokwim coast this
afternoon, which is showing up nicely on the bethel doppler
radar, with a strongly occluded front extending east through the
lower kuskokwim delta. Strong wind gusts have been observed in
advance of the front, with winds quickly dropping off following
frontal passage allowing for some rain showers to develop or mix
in with the snow, as warmer air surges inland in the lower levels.

Meanwhile, robust cold advection in the mid-levels is quickly
moving inland south of these features, with plenty of instability
(relatively speaking) for some graupel or small hail to develop
based on the radar and observational data across eastern bristol
bay and adjacent locations. Additionally, numerical guidance
continues to show steep mid-level lapse rates approaching 9 deg.

C km and total totals above 60. Vort maxes rotation around this
the trough axis that extends from a western bering low to the
kuskokwim low may provide enough of a burst in ascent aloft to aid
in updraft strength to possible allow a stray lightning strike or
two to develop. However, temporal and coverage uncertainties
precluded this being adding to the coastal land or marine
forecast zones.

As the western bering low heads towards the akpen by Sunday
morning, the kuskokwim low will rotate back southward with the
pair exhibiting a fujiwhara effect as they depart the region by
Sunday afternoon. Until then, showery precipitation will continue
to dominate your weather

Short term forecast bering sea aleutians (days 1 and 2)
Quite an interesting setup is in place as a 971mb low north of
adak, which has been "wobbling in place" for the last 36 hours or
so has started its southeastward journey. Meanwhile, a 962 mb low
near nunivak island will halt its northward progression, and make
a u-turn as it starts to be influenced more by the incoming low.

These systems will rotate around each other in a unique fashion as
described above, with strong cold advection continuing along
their southern and western flanks. This has been quite evident in
the observational data, with cloud top cooling also noted on the
infra-red satellite loop. Models continue to show decent
instability for this time of year, and given the instability
parameters described about, an isolated thunderstorm can't be
ruled out. However, graupel or small hail is a distinct
possibility with any heavier shower that develops.

A transitory ridge will shift from west to east across the
aleutians towards the pribilof islands for tomorrow, as todays
systems depart the region and a low rapidly deepens to 944 mb
across the western bering by Sunday morning, with an attendant
cold front stretching south. This front will impact western
portions of the area with storm near storm force sustained winds
developing, and seas rapidly increasing in height given a
favorable fetch augmented by the baroclinic winds.

Long term forecast (days 3 through 7 Mon through fri)...

the weather picture for next week is starting to become clearer.

There are 2 major features to focus on. The first will be a very
deep low over the western bering Mon and its associated front. The
low will bottom out somewhere in the 945 mb range late Sun into
early mon. But its trek across the bering will impact the whole
area to start the week. Along the front, storm-force winds and
moderate rain should be expected through the aleutian chain as it
pushes from west to east. Behind the front, expect widespread
showers (transitioning from rain to snow) and gusty winds as cold
air wraps around. As the front impacts SW ak, it will start out as
snow with some gusty winds. This could create some difficult
travel conditions, so stay tuned to this portion of the forecast.

But with warm air and onshore flow, the snow should transition
fairly quickly to rain. Today models have come into better
agreement that this feature will hold together long enough to make
it into the cook inlet region. If a few ingredients hold together,
this could have the making of a decent snow event for the
anchorage area. But there is still a lot of time and variables
that have to match before there is much certainty in this
solution.

The second major feature will be a building ridge over the north
pacific to end the week. There is still abundant uncertainty as to
exactly where this feature will establish itself. On its western
edge, it will bring moderate to heavy precipitation and warm and
windy conditions. Underneath the ridge axis, it will likely be
cold and foggy. Stay tuned to the forecast to see exactly how this
pattern unfolds and what the sensible weather will be at the
surface as we move towards christmas weekend.

Afc watches warnings advisories
Public... None.

Marine... Storm 119. Gales 120 125 150 155 165 170-181 185 351 352
411-414.

Synopsis and model discussion... Ja
southcentral alaska... Sa
southwest alaska bering sea aleutians... Pd
long term... Mo


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CRVA2 - 9454050- Cordova, AK 22 mi41 min N 11 G 35 39°F 44°F998.4 hPa
VDZA2 - 9454240 - Valdez, AK 72 mi41 min W 1 G 1.9 33°F 41°F1000.4 hPa
46061 - Seal Rocks 55NM South of Valdez, AK 77 mi39 min ESE 37 G 45 40°F 44°F14 ft995.4 hPa (-5.2)

Wind History for Cordova, AK
(wind in knots)    EDIT      (on/off)   Help
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E8
G17
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G26
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G21
NE16
G30
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G19
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G42
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NE6
G13
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G7
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NE1
NE1
N5
N6
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N5
G8
NE6
NE6
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N8
N8
NE4
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NE3
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G7
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NE5
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G40
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NE18
G35
N8
G19
N10
G21
NE10
G21
E6
G14
NE8
G16
N7
G18
N6
G27
NE12
G24
NE5
G20
N12
G22
NE15
G29
SE10
G26
E16
G29
S14
G26
E12
G23
NE9
G19
N5
G12
E8
G17
N5
G14
NE10
G17
W2
G14
NE5
G9
NE4
G15

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cordova, Merle K (Mudhole) Smith Airport, AK10 mi36 minE 18 G 279.00 miLight Rain and Breezy38°F35°F89%1000.5 hPa

Wind History from ACV (wind in knots)
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Last 24hrSE10
G19
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E5E9E5E7NE7E4CalmSE3E4CalmE5E3E4E6E8
G16
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1 day agoSE4W4CalmCalmNW3N3CalmCalm3W4CalmW3NW5CalmE4CalmCalmCalmSW3CalmNE5E5E15
G26
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G16
2 days agoE11
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G32
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G28
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G25
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G24
NE12
G17
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E4E7SE4E3SE5SE6

Tide / Current Tables for Pete Dahl Slough, Copper River Delta, Alaska
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Pete Dahl Slough
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Fri -- 05:40 AM AKST     3.62 feet Low Tide
Fri -- 06:25 AM AKST     Moonrise
Fri -- 09:43 AM AKST     Sunrise
Fri -- 11:19 AM AKST     10.96 feet High Tide
Fri -- 03:00 PM AKST     Moonset
Fri -- 03:30 PM AKST     Sunset
Fri -- 06:33 PM AKST     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.27.86.95.84.63.83.74.66.38.41010.910.89.88.25.93.51.40.30.31.53.55.87.5

Tide / Current Tables for Eyak River entrance, Alaska
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Eyak River entrance
Click for Map
Fri -- 06:00 AM AKST     3.52 feet Low Tide
Fri -- 06:27 AM AKST     Moonrise
Fri -- 09:44 AM AKST     Sunrise
Fri -- 11:27 AM AKST     11.76 feet High Tide
Fri -- 03:01 PM AKST     Moonset
Fri -- 03:31 PM AKST     Sunset
Fri -- 06:53 PM AKST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
98.67.76.453.93.54.268.310.411.611.610.89.16.94.320.4013.25.77.9

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

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for (22,6,7,8)
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Ground Weather Radar Station Middleton Is., AK
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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.