Tuesday, December18, 2018 L-36.com

Marine Weather and Tides
South Glastonbury, 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 7:58AMSunset 4:43PM Tuesday December 18, 2018 8:40 PM MST (03:40 UTC) Moonrise 2:22PMMoonset 3:02AM Illumination 88% Phase: Waxing Gibbous; Moon at 11 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 South Glastonbury, MT
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location: 45.26, -111     debug

Area Discussion for - Billings, MT
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Fxus65 kbyz 182256
area forecast discussion
national weather service billings mt
356 pm mst Tue dec 18 2018

Short term Valid for Wed and thu...

winds to continue in higher terrain and gap flow areas tonight
with strong winds spreading across the plains on Wednesday.

Strong westerly flow aloft upstream over the pacific northwest
with a series of impulses bringing increasing moisture across the
western half of the state. Shortwave breaking over the canadian
rockies this evening will induce pressure falls over southeast
alberta which will bring a peak to pressure gradients which will
support window for strongest gap flow winds. Northwest to
southeast oriented 130 knot 300 mb jet will follow this wave which
then begins to induce pressure rises over western montana.

Cold front moves through central montana on Wednesday which will
begin to cutoff strongest gap flow winds but bring increasing
winds across the plain especially as mid level momentum increases
in response to the jet. Because main surface low is tracking due
eastward across southern canada there is not a strong surface high
pressure push into the area and not a significant airmass change.

This results in a lack of significant subsidence so winds on
Wednesday will mostly be driven by momentum transfer and mixing
and not downward forcing. Absence of this factor leads to a lack
of confidence in winds exceeding 60 mph so will maintain the high
wind watch for the plains locations at this time. Do suspect that
higher spots like the bull mountains and aberdeen hill could see
stronger gusts. High wind warning for areas closer to the
mountains like big timber and harlowton looks on track. Thursday
will still be windy as another round of pressure falls in the lee
of the canadian rockies will tighten gradients but does not look
as strong as the Tuesday Wednesday pattern.

The westerly flow is moisture laden and expect periodic snow for
the mountains and showers on the adjacent low lands tonight but
increasing anticyclonic flow aloft slows this activity down later
on Wednesday. Models hint at a bit of precipitation of southeast
montana as a mid level front tracks through the area away from the
stronger downslope but do not expect much moisture. Temperatures
will be cooler the next couple of days but still 12 to 15 degrees
above normal. Borsum

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

an upper-air disturbance and surface cold front will move
across the northern rockies on Friday and bring scattered snow
showers to the region. GFS shows decent low-level instability, so
would expect some downsloping upsloping to occur and places on
northwest-facing slopes would have a better chance of
precipitation than places on southeast-facing slopes. Will go
with scattered pops given the early nature of the forecast. This
cold front will also bring a modest cooldown to the
region... Bringing temperatures closer to seasonal normals.

Precipitation should end Friday night as the disturbance moves
eastward out of mt and drier air aloft moves overhead and upper
ridging builds in. Dry weather will continue through Sunday
morning. Next push of moisture arrives from the west Sunday
afternoon with a weak disturbance. This pattern supports scattered
rain or snow showers over the lower elevations with a greater
chance of snow showers over the western mountains through Monday.

Models bring an upper low into the western us on Monday and then
bring it eastward enough to start affecting our weather as early
as Monday night as suggested by the GFS or Tuesday morning as on
the ecmwf. Models then diverge on details with the GFS deepening
the upper low over the central plains and the ECMWF keeping the
upper low farther northwest. So for now will carry chance pops for
snow rain. The overall trend is for cooler and wetter (more
precipitation) weather.

Winds will be gusty in the gap areas for much of the Friday-
Tuesday period.

High temperatures will generally be in the 40s to lower 50s on
Friday, 30s to lower 40s Saturday through Monday, and 30s on
christmas. Rms

Strong wsw surface winds will continue at klvm through Wednesday
afternoon, with current gusts up to 60 kts this evening and 50 kts
at all subsequent times. Llws will likely occur at kmls and kshr
throughout the night. Obscurations over the western mountains will
occur through the night as well. Strong, NW surface winds will
gust from 30-50 kts at kmls, kbil, and kshr starting late
Wednesday morning and persisting through the afternoon. Vertz

Preliminary point temp pops
Wed Thu Fri Sat Sun Mon tue
bil 039 050 030 049 035 048 026 040 024 041 027 043 025 037
11 N 00 b 12 W 11 b 12 W 22 W 23 o
lvm 034 044 029 046 033 043 022 036 021 038 025 040 024 036
62 W 00 N 23 W 11 N 12 W 22 W 23 o
hdn 035 052 025 050 029 050 023 042 019 043 022 044 020 038
11 N 00 b 13 W 11 b 11 b 22 j 23 o
mls 034 045 026 042 027 043 023 037 018 037 021 038 020 033
11 N 00 u 03 W 00 u 11 u 11 E 12 s
4bq 032 045 026 044 027 045 024 037 019 038 022 039 021 036
11 N 00 u 03 W 10 b 11 u 11 E 12 o
bhk 035 045 027 042 025 044 023 037 018 038 021 038 020 033
11 N 00 u 03 W 10 N 11 b 11 E 12 s
shr 032 046 023 048 028 050 021 038 017 042 020 043 020 038
21 N 00 u 03 W 11 b 01 b 11 b 13 o

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

High wind watch in effect from late tonight through Wednesday
evening for zones 29-34-35-38-42-57-58.

High wind warning in effect until noon mst Wednesday for
zones 65-66.

Wy... High wind watch in effect from late tonight through Wednesday
evening for zone 99.

Weather.Gov billings

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT37 mi1.7 hrsN 010.00 miOvercast42°F30°F62%1011 hPa

Wind History from BZN (wind in knots)
Last 24hrNE3E85E5CalmE4SE7SE7E5SE6E4E5SE9SE3E6NE3CalmSW14
1 day agoS4SW5SE9CalmCalmCalmSE8SE5S6SE5S6SE7S5SE3E3CalmE3CalmSW10
2 days agoSE6SW8S4SE5SE5S6CalmSE4SE4SE5SE5NW3CalmS3CalmSW3CalmCalmN3SE3S3S6SE10N4

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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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.
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Wind Forecast for Billings, MT (22,6,7,8)
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Ground Weather Radar Station Billings, MT
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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.