Sunday, December17, 2017 L-36.com


Marine Weather and Tides
Halibut Cove, 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 10:08AMSunset 3:44PM Sunday December 17, 2017 4:49 AM AKST (13:49 UTC) Moonrise 8:01AMMoonset 3:25PM Illumination 1% Phase: Waning Crescent; Moon at 29 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
    EDIT      (on/off)   Help
PKZ141 Kachemak Bay- 353 Am Akst Sun Dec 17 2017
Today..NE wind 10 kt becoming N 15 kt in the afternoon. Seas 2 ft.
Tonight..N wind 10 kt. Seas 2 ft.
Mon..Variable wind less than 10 kt. Seas 2 ft.
Mon night..SE wind 15 kt. Seas 2 ft.
Tue..SW wind 20 kt. Seas 6 ft.
Wed..S wind 15 kt. Seas 3 ft.
Thu..E wind 20 kt. Seas 3 ft.

7 Day Forecast for Marine Location Near Halibut Cove, AK
   Hourly   EDIT   Help
location: 59.51, -151.22     debug


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxak68 pafc 170110
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
410 pm akst Sat dec 16 2017

Analysis and upper levels
A broad upper low stretching from the bering sea to the eastern
border of alaska continues to dominate the regional upper air
pattern. The main upper low center remains over the eastern bering
sea with a series of weak embedded shortwave troughs in southwest
flow tracking toward the north gulf coast. One of these is clearly
visible on satellite imagery with an associated deformation band
moving into prince william sound. Behind this shortwave, there is
an extensive region of post-frontal unstable air, clearly evident
in satellite imagery with a large region of convective cumulus.

Some lightning has been observed on the GOES lightning detector in
this unstable air mass, including over kodiak island. Finally, a
powerful low is beginning to develop just south of the kamchatka
peninsula. This low will become a major weather "player" over the
next few days as the storm force front moves across the bering
sea.

Model discussion
The numerical weather models are in excellent agreement with the
general synoptic pattern for the next 4 days with little to no
discrepancy. All the models are progging a powerful storm force
front expected to cross the bering sea then move inland across
southwest alaska Monday and into southcentral Tuesday. Agreement
is very good and all the models are depicting a similar scenario
with the exception of the ECMWF which shows more overrunning snow
across parts of southcentral Tuesday. For now, a more "moderate"
approach will be favored since the GFS nam are depicting a
stronger cross-barrier gradient which would act to limit some
inland snow amounts for select.

Aviation
Panc...VFR conditions are expected to prevail through most of the
taf period in a showery southwest flow regime, however occasional
MVFR conditions will remain possible, although unlikely, through
early Sunday morning before shower threats end.

Short term forecast southcentral alaska (days 1 and 2)
Snow and rain showers will persist over the coastal areas tonight
as a shortwave embedded within the base of an upper level low to
the west sweeps through the northern gulf prince william sound
area. Precipitation should stay mostly to the east of the chugach
front this evening, though a few stray snow showers may make it
into anchorage and the mat-valley. Showers will taper off some
overnight before a surface low moves into the gulf tomorrow
bringing another round of precipitation to the coastal areas
during the day. Cold air will wrap around the backside of the low
which should help keep temperatures cool enough for the
precipitation to stay as mostly snow. The surface low will weaken
and move off to the east allowing a ridge of high pressure to
build in over the area by Monday. Fog could develop over the cook
inlet area, including anchorage and the mat valley, on Sunday
night Monday morning as the ridge axis moves overhead, allowing
strong subsidence to combine with clearing skies and cold surface
temperatures. Areas without fog on Monday will see mostly clear
skies though temperatures will be noticeably cooler than the
previous weeks, though around average for this time of year.

Short term forecast southwest alaska (days 1 and 2)
The eastern bering low will track south along the southwest alaska
coastline tonight before being absorbed into the low forming in
the western gulf Sunday morning. As it passes, it will bring
light snow showers to southwest alaska. Ridging will then build in
over the area on Sunday clearing out the showers and also helping
with fog formation over the area Sunday night.

Short term forecast bering sea aleutians (days 1 and 2)
Ridging is building in over the western bering and tracking east
which will help to diminish the remaining showers over the
eastern aleutians and alaska peninsula. Behind the ridging a new
system will deepen in the far western bering to sub 960 mb.

The front with this system will move over the central aleutians
Sunday afternoon bringing storm force winds as it passes. It will
then make it to the eastern bering by Monday morning as the winds
begin to slowly diminish. This system will pull up enough warm air
from the south for the majority of the precip with the front to
fall as rain. Behind the front, cold air will move back in
bringing snow showers in its wake.

Long term forecast (days Tuesday through Saturday)
On Tuesday, all of southern alaska will be under the influence of a
weakening weather front moving from west to east. In general, a
front oriented southwest to northeast should not cause too much
downsloping, so the usually drier areas have a pretty good chance
of seeing some precipitation from this storm. Most coastal areas
will probably warm up enough to see rainfall, but from anchorage
northward the airmass might just be cold enough for a few inches
of snow at lower elevations. Details are uncertain, so stay tuned.

We are more confident that the northern susitna valley and
hatcher pass areas should see some significant accumulations of
snow from this storm.

For the 2nd half of next week, models continue to indicate the
resurgence of a strong ridge over the eastern gulf, that produced
deep-layer (and warm) southerly flow across most of southern
alaska. This is the same type of pattern that we've been stuck
under for much of december so far. The orientation and strength of
the ridge will dictate what coastal locations are most likely to
get slammed by heavy precipitation (somewhere from kodiak to
cordova), as well as how warm and windy interior locations like
anchorage will get. Stay tuned.

Afc watches warnings advisories
Public... None.

Marine... Storms 173-178 411-414 119 120 130-132 138 150 155 165
170-172 179-181 185.

Synopsis and model discussion... Ja
southcentral alaska... Kvp
southwest alaska bering sea aleutians... Dk
long term... Ad


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OVIA2 - 9455500 - Seldovia, AK 27 mi49 min 44°F992.9 hPa (+1.4)
46108 - Central Cook Inlet - 175 33 mi41 min 44°F2 ft
FILA2 - Flat Island Light, AK 43 mi49 min N 2.9 G 6 39°F 992.4 hPa (+1.4)38°F

Wind History for Nikiski, AK
(wind in knots)    EDIT      (on/off)   Help
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last
24hr
S16
G20
SW13
G17
W12
S2
S12
S15
S12
G15
S11
G16
SW5
SW4
NW4
E4
E5
E2
E3
G6
N1
E5
E5
E3
NE4
NE8
NE5
NE6
G9
NE8
G11
1 day
ago
E8
NE2
NE9
NE7
G12
NE11
G16
NE13
G19
NE11
G17
NE13
G16
NE9
G12
E9
NE9
NE9
G15
NE7
G12
NE14
G21
NE18
G27
NE18
G27
NE12
G16
NE7
SE11
G15
S18
G23
S22
S22
G27
SW17
S16
2 days
ago
NE8
NE1
G4
N2
E1
N4
N4
NW2
W1
--
S7
S8
S11
S10
S12
G15
S12
G15
S13
S11
S9
S7
SE7
S7
SE5
SE7
E8

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Homer, Homer Airport, AK17 mi56 minENE 410.00 miOvercast35°F32°F89%993.5 hPa

Wind History from AHO (wind in knots)
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last 24hr4SE7SE7S7S4W6W5W3SW5SW6CalmCalmCalmCalmE5N5NE3CalmNE5N4E3NE3NE3NE4
1 day agoE8NE5E6NE3E5
G15
E8
G19
SE5E10NE9NE13E15E21
G28
E13
G19
E14
G27
6SE8S9
G18
SW10
G18
S8S8SE7SE6S5SE4
2 days agoE3NE3E33CalmCalmNW35SW63CalmNE3SE3NE4NE3E4CalmCalmCalmCalmCalmNE3NE3N6

Tide / Current Tables for Halibut Cove, Kachemak Bay, Cook Inlet, Alaska
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Halibut Cove
Click for Map
Sun -- 02:01 AM AKST     18.01 feet High Tide
Sun -- 07:31 AM AKST     3.70 feet Low Tide
Sun -- 09:01 AM AKST     Moonrise
Sun -- 10:00 AM AKST     Sunrise
Sun -- 01:32 PM AKST     19.75 feet High Tide
Sun -- 04:01 PM AKST     Sunset
Sun -- 04:25 PM AKST     Moonset
Sun -- 08:04 PM AKST     -1.40 feet Low Tide
Sun -- 09:31 PM AKST     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1417181714.210.36.44469.513.617.219.419.517.513.88.93.90.1-1.4-0.42.67

Tide / Current Tables for Homer, Kachemak Bay, Cook Inlet, Alaska
   EDIT      (on/off)   Help   One Week of Data
Homer
Click for Map
Sun -- 01:54 AM AKST     17.51 feet High Tide
Sun -- 07:35 AM AKST     3.60 feet Low Tide
Sun -- 09:02 AM AKST     Moonrise
Sun -- 10:01 AM AKST     Sunrise
Sun -- 01:25 PM AKST     19.25 feet High Tide
Sun -- 04:02 PM AKST     Sunset
Sun -- 04:25 PM AKST     Moonset
Sun -- 08:08 PM AKST     -1.50 feet Low Tide
Sun -- 09:31 PM AKST     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
13.816.617.516.413.79.96.343.85.89.313.4171918.916.813.28.53.70.1-1.5-0.62.46.8

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
npac_satellite

GOES Local Image of Alaska    EDIT
Geos

Ground Weather Radar Station Kenai, AK
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.