Thursday, April22, 2021
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Marine Weather and Tides
South Glastonbury, MT

Version 3.4
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1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:23AMSunset 8:21PM Thursday April 22, 2021 8:10 PM MDT (02:10 UTC) Moonrise 1:52PMMoonset 3:41AM Illumination 85% 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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Area Discussion for - Billings, MT
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FXUS65 KBYZ 222308 AFDBYZ

Area Forecast Discussion . Corrected National Weather Service Billings MT 508 PM MDT Thu Apr 22 2021

DISCUSSION. Corrected Highlights at bottom. BT

Tonight through Saturday night .

Cold front right on the door step of entering the county warning area from the northwest. This front will sweep southeast through southern Montana and northern Wyoming the rest of this afternoon and this evening. Precipitation will develop several hours after frontal passage. Mountains and foothills will get in on the action first, with the plains developing snow late this evening and early overnight. Main upslope/overrunning event will take place overnight into Friday morning. Most, if not all of the precipitation looks to take place in the cold air, so most of the event should be snow. Would expect a brief period of rain before mixing with, and then changing to snow, by the late evening to early overnight hours. Models have been gradually stepping up QPF amounts and thus raising potential snow totals. Would expect upwards of a half inch of QPF for the mountains and foothills, with around two tenths over the plains. Hourly temperature guidance was suggesting readings falling to around 30 degrees, or even into the upper 20s late tonight and Friday morning, which could lead to some icing up of roads. Have decided to issue a Winter Weather Advisory for most of the south central zones, given slightly higher snow amounts and the possibility of slick roads for late tonight and Friday morning.

Snow will linger Friday morning before tapering off early in the afternoon. High April sun angle should turn the roads wet again by mid morning, so believe the early morning is the time that is most at risk for slick roads and walkways. Will have to watch the Bighorn mountains closely as the snow starts later there and gets closer to the starting point for Advisory snow (6 inches). Will let subsequent shifts take a closer look at that for a potential highlight. For now, have amounts just under criteria.

Saturday will be warmer and dry as the flow backs to more of a westerly direction. Shortwave energy and some instability works into the mountains for a chance of showers. These scattered showers will spread out onto the plains Saturday afternoon and evening. TWH

Sunday through Thursday .

Extended period will feature needed moisture through about midweek. Good model cluster agreement on upper trough/low off the N CA/W OR coast on Sunday, moving E toward the region while splitting Monday through Tuesday. While bulk of the energy will be to the S of the area, moving through the four-corners region, the trough will still be somewhat anomalously strong for the forecast area on Monday. Rain with mountain snow will overspread the area from W to E through Sun. night. Best chances for rain with some foothills snow will be from Musselshell to S. Big Horn County W Sun. night through Mon. with lower precipitation chances Mon. night and Tuesday. NBM suggested a slight chance of thunder Mon. afternoon W of KBIL which looked good given the strength of the trough. As the system continues moving E, precipitation will end Tue. evening. Drier weather with a warming trend will move in for Wednesday and Thursday as a decently strong upper ridge follows the system. While it will be breezy at times, winds did not look overly strong during the period. Monday will be the coolest day of the period with highs in the low to mid 50s. Expect lows to drop below freezing NW of KBIL in places like Harlowton Monday and Tuesday nights.

AVIATION.

VFR conditions will deteriorate from W to E tonight as rain and snow move into the area. A cold front was dropping SE through the area this afternoon and will move out of SE MT between 03Z and 06Z tonight. Winds will shift to the NNW behind the front and become gusty at 25 to 30 kt. The winds will become NE this evening over KLVM and KBIL. Conditions will become MVFR/IFR in rain and snow from W to E tonight. Rain will become all snow by late tonight and continue Friday morning. Conditions will begin to improve Fri. afternoon. Mountains will become mostly obscured tonight and will remain obscured through Friday morning. Arthur

PRELIMINARY POINT TEMP/POPS.

Fri Sat Sun Mon Tue Wed Thu ----------------------------------------------------------- BIL 029/039 028/057 037/058 039/052 037/058 036/065 042/069 88/S 02/R 44/R 66/R 44/R 11/B 11/B LVM 029/045 031/055 037/055 037/051 033/055 033/062 040/064 85/O 04/R 77/R 88/T 54/O 11/B 12/R HDN 030/041 026/060 036/060 039/053 036/057 034/065 039/070 88/O 01/E 33/R 66/R 44/R 11/B 11/B MLS 029/043 024/056 037/058 038/052 035/058 034/063 039/070 34/S 00/E 42/R 54/R 32/R 10/U 11/B 4BQ 030/041 025/057 036/060 040/055 037/054 035/061 040/068 15/S 00/B 20/E 44/R 44/R 10/U 01/B BHK 026/040 021/053 033/058 036/050 032/055 032/060 037/067 04/S 00/B 31/E 54/R 33/R 11/U 01/B SHR 029/038 024/059 034/060 037/051 034/051 031/060 035/065 57/S 10/B 11/B 55/R 55/R 21/B 11/B

BYZ WATCHES/WARNINGS/ADVISORIES. MT . Winter Weather Advisory in effect from 10 PM this evening to noon MDT Friday FOR ZONES 34-40-57-64-65-138-141-169-170-172-235. Winter Weather Advisory in effect until noon MDT Friday FOR ZONES 56-66. WY . None.

weather.gov/billings


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bozeman, Gallatin Field, MT37 mi14 minNW 910.00 miOvercast39°F25°F57%1011.9 hPa

Link to 5 minute data for KBZN

Wind History from BZN (wind in knots)
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Last 24hrNE4E6S7SE5E7SE9SE5SE7S4SE5SE4--CalmN33W8W6NW6NW8NW11N11N19N23N18
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1 day agoE5CalmS6SE8E5NE5N3CalmS3S5NE3E3CalmE343CalmN4SW44N5NW5CalmCalm
2 days agoN9NW5CalmCalmW3CalmW4CalmNW3CalmN3CalmSE3CalmCalmSW4N43SW54NW6NW4W3W4

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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