Wednesday, December12, 2018 L-36.com


Marine Weather and Tides
Park City, MT

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 7:44AMSunset 4:31PM Wednesday December 12, 2018 12:13 AM MST (07:13 UTC) Moonrise 11:39AMMoonset 9:40PM Illumination 22% Phase: Waxing Crescent; Moon at 5 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 Park City, MT
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location: 45.83, -109     debug


Area Discussion for - Billings, MT
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Fxus65 kbyz 120355
afdbyz
area forecast discussion... Updated
national weather service billings mt
855 pm mst Tue dec 11 2018

Update
No changes to the going wind highlites along the western
foothills. Gusts in livingston have already reached 77mph this
evening with gusts to 50 in big timber. Expect winds to peak out
in livingston sometime in the early morning hours, with speeds
falling around sunrise as a cold front pushes through. For the
rest of the area winds will increase from the early morning hours
through mid day tomorrow as the cold front moves through. This
will be the period winds in the big timber to harlowton corridor
are expected to reach 60mph. Going forecast has this covered
well.

Made a few tweaks to temperatures tonight as cloud cover and
winds will help hold temperatures up in the 25 to 40 degree range
across the central and western lower elevations.

Significant moisture fetch will begin to lower cloud bases with
virga and maybe some light precipitation developing ahead of the
front after midnight over central areas from east of billings into
rosebud county. Vertical profiles suggest a mix of rain and snow,
with a very slight chance of freezing rain in the river valleys
that will need to be watched closely overnight. Expect snow to get
going after midnight in the western mountains with 6 to 10 inches
expected in the mountains around cooke city through tomorrow
morning. Chambers

Short term Valid for Wed and thu...

beginning of a very windy multi day period begins tonight as the
leading edge of an energetic jet across the pacific moves into
western montana. With cold air already in place over northern
wyoming and southeast idaho pressure gradients will tighten as the
pacific energy causes strong pressure falls over alberta.

Orientation of the pressure gradient favorable for gap flow winds
tonight through early Wednesday before a cold front causes a
shift in the surface pressure orientation. This cold front will
bring the winds into the plains mainly west of billings Wednesday
morning which will be augmented by some momentum transfer as 50kt
700mb winds move across the area. This will bring very strong
winds to the us191 corridor from big timber through judith gap and
have expanded the high wind warning to cover this area.

Ahead of the cold front and as a shortwave crosses the area the
mountains will see a period of snowfall as the energy stream
brings increased mid level moisture to the atmosphere. As this
moves across the plains Wednesday shower activity should be more
scattered and downslope will limit some of the moisture from
reaching the ground. Expect mountains to see 4 to 8 inches of snow
tonight and Wednesday especially areas north of cooke city and
west facing aspects along the paradise valley but temperatures are
on the warm side which may limit accumulations.

Wednesday night is a quieter period but reestablishment of high
pressure over southeast idaho tightens pressure gradients again
with another surge of shortwave energy crossing canada inducing
leeside pressure falls. Expect gap area winds to again become very
strong Thursday and staying elevated into Friday. Plains winds do
not respond quite as strongly in this period because multiple
pulses of energy keep the leeside trough more anchored than the
Wednesday signature. Main moisture stream is shifted a bit north
so Thursday looks to be drier. Temperatures will continue to run 5
to 10 degrees above normal. Borsum

Long term Valid for fri... Sat... Sun... Mon... Tue...

wind pattern continues into the weekend with great basin high
pressure trying to become a bit more dominant in the extended
period. One strong piece of energy slides from SW bc into northern
alberta on Friday and this supports strong winds during the day
but the tail end of this energy may disrupt pressure gradients a
bit Friday night. A very powerful gulf of alaska low shifts
towards the coast for Saturday and slowly weakens which causes the
leeside trough to become a developing low pressure system across
saskatchewan and manitoba so winds lull Saturday night. Pressure
gradients become a bit better established Sunday into Monday but
energy stream is so active that the leeside trough is more
variable so while it will be a windy period... May not be very
windy. Transition of the jet stream early next week to lay across
the area will maintain the winds for gap flow areas but give more
support for plains to see some windy days.

Otherwise will be a dry pattern with above normal temperatures
with models hinting at some powerful downslope middle of next week
bringing some well above normal temperatures. Borsum

Aviation
Light, isolated rain and snow showers will occur across south-
central and south-eastern montana through Wednesday morning,
possibly bringing about MVFR conditions. Southwesterly surface
winds are currently gusting up to 60 kts at klvm, and will
persist with gusts from 45-60 kts through tomorrow afternoon. All
other terminals will have gusts from 30-40 kts starting late
Wednesday morning and continuing through the afternoon. Vertz

Preliminary point temp pops
Wed Thu Fri Sat Sun Mon tue
-----------------------------------------------------------
bil 034 044 024 043 028 048 031 048 027 048 030 049 030 049
11 N 10 N 00 b 11 b 00 u 00 b 00 b
lvm 032 039 023 037 023 045 029 043 024 045 028 045 029 044
27 W 00 N 00 N 10 N 00 N 01 N 03 w
hdn 027 045 021 044 022 050 026 048 022 048 023 050 024 050
13 W 10 N 00 u 11 b 00 u 00 b 01 u
mls 023 041 021 039 023 042 024 043 020 040 020 042 024 043
13 j 10 u 10 u 11 b 00 u 00 b 00 u
4bq 023 041 021 039 023 043 026 044 022 042 023 044 024 045
04 W 10 N 00 u 11 b 00 u 00 b 00 u
bhk 022 040 022 039 024 044 027 043 022 041 023 042 025 043
04 W 20 N 00 u 00 b 00 u 00 b 00 u
shr 022 043 017 043 020 050 024 045 021 047 024 049 024 048
15 W 20 N 00 u 00 b 00 u 00 b 00 u

Byz watches warnings advisories
Mt... High wind warning in effect from 3 am to 9 pm mst Wednesday
for zones 28-41-63.

High wind warning in effect until 5 pm mst Thursday for zones
65-66.

Wy... None.

Weather.Gov billings


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Billings, Billings Logan International Airport, MT25 mi21 minWSW 15 G 2310.00 miMostly Cloudy41°F17°F38%1003.6 hPa

Wind History from BIL (wind in knots)
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Last 24hrW10W10W7W9W12W11SW8SW7SW8SW7SW10SW13SW16SW16SW14
G22
SW11W13W16SW18W19
G25
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W17
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G31
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1 day agoSW21
G30
SW12
G19
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SW20SW15SW12SW13SW16SW13SW12W7SW17SW15
G24
SW14SW12SW13SW12SW12SW8W11W11Calm5
2 days agoSW15SW12SW13SW15SW14SW14SW14SW16SW16SW12SW15SW22
G31
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G26
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G26
SW16
G23
SW18
G26
W19SW18
G26
SW21SW23
G28
SW23SW24SW16
G25
SW15

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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wmap_P
GOES Local Image of    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Billings, MT (2,6,7,8)
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Ground Weather Radar Station Billings, MT
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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.