Friday, March22, 2019 L-36.com


Marine Weather and Tides
Pedro Bay, AK

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:54AMSunset 8:18PM Thursday March 21, 2019 10:58 PM AKDT (06:58 UTC) Moonrise 7:46PMMoonset 7:05AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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 Pedro Bay, AK
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location: 59.62, -153.58     debug


Area Discussion for -
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Fxak68 pafc 220127
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
527 pm akdt Thu mar 21 2019

Analysis and upper levels
The main feature on satellite continues to be the large occluded
low pressure spinning south of the alaska peninsula in the
northern pacific ocean. The frontal boundary associated with the
system wraps from the low center northward through the central
bering sea, across the southern mainland, then southward, stretching
nearly to the hawaiian islands. The front and disturbances aloft
will be the focus for active weather. A blowing snow advisory has
been issued for the pribilof islands for this evening. The same
front extends into the gulf of alaska near kodiak island. The
other controlling features aloft is a ridge of high pressure over
western canada. The combination of feature keeps the jet pointed
toward the north gulf coast, ensuring a parade of disturbances and
moisture in coming days.

Model discussion
In the very short term, guidance has honed in on frontal position
in the bering and precipitation timing amounts. No major
discrepancies. For the following frontal wave impacting the gulf
coast, timing and position is not well agreed upon, but the
existence of a feature is there in all models.

Aviation
Panc...VFR conditions and light winds will persist. Strong
winds will persist down turnagain arm, but will bend south down
cook inlet. As the next front approaches early Friday the down
inlet pressure gradients will weaken allowing increasing
southeasterly winds aloft to move closer to the terminal.

Thus, have added a period of low level wind shear.

.Short term forecast southcentral alaska (days 1 and 2: tonight
through Saturday)...

a front lifting north across the central gulf this afternoon will
be the primary weather maker for southcentral right into Saturday.

While the front itself is slowly weakening, it is producing gale
force winds across a swath of the central gulf from kodiak north
through the barren islands and shelikof strait. As it moves
northeast into prince william sound tonight, it is expected to
stall out there and persist into the the day Saturday.

Southeasterly winds along the front means there will be a
continuous feed of onshore winds into the kenai and chugach
mountains. Thus, near steady valley rain and mountain snow is
expected through Saturday, particularly along the eastern kenai
peninsula. The front will continue slowly weakening through
Saturday, so those unfortunate enough to be along the front
through Saturday should see steadily improving conditions after
the worst weather impacts the area tonight.

With this weather setup in place, the winds through turnagain arm
are expected to increase tonight and remain persistent through
Saturday. The strongest winds will be tonight as that is when the
front will be the strongest. A low to mid level jet associated
with the front will be aligned from prince william sound westward
along turnagain arm. Thus, it appears likely that despite the
strong downsloping winds, some of the precipitation should impact
anchorage, especially along the hillside tonight into Friday
morning. The 00 utc anchorage sounding shows a very unstable layer
of atmosphere through the mid-levels, which will promote mixing
and help some of that rain make it to the bowl. With that said,
however, any rain tonight will be light. While chances are slight,
they are still non-zero that snow may mix in, as the warming
effect of the turnagain arm wind is expected to remain south of
anchorage, owing to the strong northerly down-inlet winds. Thus,
lows should fall into the 30s for much of southcentral tonight.

The matanuska knik valley winds are also expected to be ongoing
through at least Friday in the 15 to 25 mph range with higher
gusts, though which one of the two dominates is very uncertain.

Up through this point, it has been variable. A lack of any truly
cold air anywhere near southcentral will help keep any winds from
becoming damaging. Temperature-wise, continued well above-average
readings are expected for the foreseeable future as highs for many
locations come very close to their daily records.

The parent low of the front, currently well south of kodiak
island, will track northwestward west of chirikof island Friday
morning. This will bring another round of gales to kodiak island
from late tonight through at least the first half of Friday. While
the front remains stalled over the northern gulf on Friday, some
sunshine can be expected across kodiak island by Saturday along
with much-diminished winds as high pressure builds in.

Short term forecast southwest alaska (days 1 and 2)
A warm front currently located near hooper bay is bringing snow
and blowing snow to areas along the immediate coast. Snow is
expected to end over the coming hours, however blowing snow will
continue through Friday for this region in the wake of the front.

Elsewhere, south of the front over interior regions, strong warm
advection east of a low moving over the akpen will bring
unseasonably warm temperatures Thursday and Friday, with highs
approaching the mid- 50s in downsloped areas of the alaska range.

As the low dissipates over the bristol bay, advection will weaken
bringing cooler temperatures for Saturday. Isolated rain snow
showers are possible, however they will be very light.

Short term forecast bering sea aleutians (days 1 and 2)
A warm front west of a low moving over the akpen is expected to
bring gale force winds and higher seas to the central bering
southward to the aleutians this evening through Friday. Snow and
blowing snow with reduced visibility is highly likely over the
pribilofs. Most models have been indicating the front moving
faster to the west over the past 24 hours and conditions over
this region will gradually improve beginning later Friday
morning. The surface low will dissipate over bristol bay as it
becomes vertically stacked with an upper level low. Thus, winds
will diminish and seas subside across much of the bering aleutians
from south to north Friday night into Saturday. An ~970mb low
moving south of the kamchatka peninsula will possibly bring gales
and higher seas to the western aleutians through Saturday.

Marine (days 3 through 5)
Gulf of alaska... Expect generally benign conditions, with winds
diminishing and seas subsiding as a low in the gulf of alaska
fills.

Bering sea... Confidence is high that a gale force low will
approach the western aleutians Sunday, bringing high seas and
widespread gales to the central bering and aleutians Monday. Some
model solutions depict a swath of storm force winds in the central
aleutians eastern bering Monday... While we didn't have the
confidence to go that high with this forecast package, the
potential for storms will need to be monitored. The low will
weaken and shift northward towards eastern siberia by Tuesday
and winds will diminish.

Long term forecast (days 3 through 7)
Wet weather will continue over southcentral as several waves
associated with a north pacific low rotate into the area. However,
confidence is building that dry weather is in sight for
southcentral. Models continue to develop a longwave ridge over
southcentral early next week. Daytime conditions will trend even
warmer than observed this week, though valley locations will
likely see cold nights driven by clear skies. The main question is
when the ridge will degrade, and model agreement is poor on that
decision. Some solutions show the ridge breaking down as early as
midweek, with a return to wetter weather following.

Looking farther west, a series of lows will move through the western
and central bering throughout the long term, starting with a
potent low expected to approach the western aleutians late Sunday.

With a moisture fetch almost to the tropics, expect heavy
precipitation ahead of the low. As the low shifts northward into
the bering Monday, the front and associated precipitation and
winds will progress eastward over the aleutians and bering, then
stall over southwest Tuesday. A ridge in place over southcentral
will likely diminish precipitation potential over the southwest
mainland. Showers in cold air advection will persist behind the
front in the bering. A series of smaller lows will bring periods
of unsettled weather to the bering and aleutians through next
week, while conditions over the mainland will depend on the
progression of the upper ridge.

Afc watches warnings advisories
Public... Winter weather advisory 195.

Marine... Heavy freezing spray warning 185.

Gale warning 119 120 130 131 132 136 137 138 139
150 170 171 172 173 174 175 176 178
179 185.

Fire weather... None.

Synopsis and model discussion... Mtl
southcentral alaska... Jw
southwest alaska bering sea aleutians... Ap
marine long term... Mm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AUGA2 - Augustine Island, AK 21 mi59 min ENE 26 G 30 39°F 993 hPa (+0.4)39°F
FILA2 - Flat Island Light, AK 86 mi59 min E 17 G 22 42°F 992.3 hPa (-0.5)38°F
AMAA2 - East Amatuli Light, AK 99 mi59 min E 31 G 38 42°F 992 hPa (+0.9)40°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Wind History from ALJ (wind in knots)
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Last 24hr--NE20--NE14--E10------------------------------NE20
G35
--NE20
1 day ago------NE6----------------------------------NE10--E12
2 days ago--SW6------SW16----------------------------------NE7

Tide / Current Tables for Iliamna Bay, Alaska
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Iliamna Bay
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Fri -- 04:21 AM AKDT     17.76 feet High Tide
Fri -- 08:09 AM AKDT     Sunrise
Fri -- 09:18 AM AKDT     Moonset
Fri -- 10:32 AM AKDT     -2.92 feet Low Tide
Fri -- 04:43 PM AKDT     17.28 feet High Tide
Fri -- 08:33 PM AKDT     Sunset
Fri -- 10:49 PM AKDT     -2.47 feet Low Tide
Fri -- 11:17 PM AKDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.2611.215.417.617.314.610.250.3-2.5-2.6-0.14.19.113.716.617.215.411.66.71.8-1.5-2.4

Tide / Current Tables for Oil Bay, Kamishak Bay, Alaska
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Oil Bay
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Fri -- 05:25 AM AKDT     17.10 feet High Tide
Fri -- 08:08 AM AKDT     Sunrise
Fri -- 09:17 AM AKDT     Moonset
Fri -- 11:32 AM AKDT     -2.95 feet Low Tide
Fri -- 05:46 PM AKDT     16.64 feet High Tide
Fri -- 08:32 PM AKDT     Sunset
Fri -- 11:16 PM AKDT     Moonrise
Fri -- 11:49 PM AKDT     -2.50 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.30.95.610.514.716.916.714.29.94.80.2-2.5-2.7-0.33.88.61315.916.614.911.26.51.7-1.6

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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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.