South Glastonbury, MT Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for South Glastonbury, MT

April 21, 2024 2:11 AM MDT (08:11 UTC) Change Location
Sunrise 6:24 AM   Sunset 8:20 PM
Moonrise 5:17 PM   Moonset 4:37 AM 
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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.

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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 210806 AFDBYZ

Area Forecast Discussion National Weather Service Billings MT 206 AM MDT Sun Apr 21 2024

DISCUSSION

Today through Monday night...

Ridging over the area for the first part of the day will flatten this afternoon as a strong upper low moves across southern Canada.
850mb temperatures rising to around 15c will lead to highs in the mid to upper 60s. Abundant sunshine (aided by precipitable water values below 0.50) will lead to humidity falling into the teens to mid 20s in the afternoon. Winds are not expected to be that strong ahead of a cold front, with 10-20mph most places. A cold front arrives in the evening and snaps the wind direction to the northwest and north, with some gusts 25-35mph. A line of showers will develop along and behind the front, developing over western and central zones late afternoon, moving east into southeast Montana overnight. GFS was putting down a tenth of an inch of QPF over parts of the southeast zones overnight. Instability is limited with capes 100-300j/kg, so will keep any lightning near the slopes were cape is progged the highest.

The deep upper low over southern Canada drops southeast into northern North Dakota by Monday afternoon. This will bring a dry slot across the forecast area in the early afternoon with humidity falling into the teens to lower 20s. 850mb winds increase to 30-40kts (strongest over the east). NBM has a 65% probability of Baker hitting 40+mph gusts with a 25% chance at Miles City.
Billings will be gusty too, but 850mb winds were weaker over central and western zones, but there is still a 30% chance of gusts of 30+mph at Billings Monday afternoon. Temperatures will be cooler than Sunday (about 5-10 degrees) with highs in the mid 50s to around 60 degrees (which is seasonal). Minimum humidities are progged to stay above 20 percent in the east (where the winds will be the strongest). That and the fact that temperatures will be cooler (highs only in the mid 50s at Baker) leads to holding off on any fire weather highlights for Monday. Will brief the day crew about a potential Rangeland Fire Danger Statement for Monday over the east, but overnight showers and cooler temperatures could greatly inhibit that. Winds decrease Monday night. TWH

Tuesday through Sunday...

An active weather pattern is shaping up next week. Be sure to monitor the forecast over the coming days.

Tuesday through Wednesday morning will see the quietest weather of the week as upper ridging moves across the region. Temperatures will respond accordingly, with highs in the upper 50s to lower 60s Tuesday and lower to mid 70s Wednesday. By Wednesday afternoon, we could see showers move back into the west as upper level flow backs to the SW, allowing Pacific moisture and shortwave energy to move in (20-60% chance, highest over the mountains). This will kick off the start of a potentially active second half of the week and weekend.

On Thursday, a developing trough along the west coast will contribute to height falls and more unstable weather developing across our area. At this time, the NBM has a 15-80% chance for precipitation Thursday, with the highest chances over the mountains and foothills and lowest chances north and east of Billings. This precipitation will be aided by increased precipitable water values streaming in from the Gulf of Mexico, so heavy rain with a few thunderstorms is not out of the question.
Outside of precipitation, Thursday will still be warm with highs generally in the upper 60s to lower 70s, but this will mark the beginning of a cooling trend for temperatures back near to slightly below normal for Friday into the weekend (normal is mid to upper 50s).

Periods of wet, unsettled weather will likely continue Friday through at least Sunday (25-80% chance for precipitation, once again highest over the mountains and foothills and lowest over Custer and Fallon Counties). Unfortunately, the exact when and where of precipitation is still uncertain. Cluster analysis shows a lot of the uncertainty lies in the development of the organized upper low projected to form over the west this weekend. A more organized and north low would provide more precipitation to the region, whereas a split or south low would provide less. If the significant precipitation does materialize, we are still looking at mid level temperatures cooling enough for higher elevation snow instead of the more problematic rain-on-snow scenario. Arends

AVIATION

VFR conditions will prevail today as clouds increase from the west. These clouds will be associated with a cold front that will move through from west to east late this afternoon into this evening, between 23Z and 06Z. This front will bring a wind shift from S/SW to N/NW with wind gusts in the 15 to 30 kt range. Along with the winds, scattered showers look to accompany the front, potentially impacting all TAF sites. While the chance for a thunderstorm remains low, we could see a thunderstorm or two develop off the Beartooth/Absarokas this afternoon/evening, potentially bringing a vicinity thunderstorm to KLVM and KBIL.
Arends

PRELIMINARY POINT TEMP/POPS

Tdy Mon Tue Wed Thu Fri Sat ------------------------------------------------------- BIL 068 037/060 034/062 039/074 047/069 046/061 043/058 1/B 50/N 00/U 01/B 25/T 34/R 36/R LVM 066 030/057 029/061 038/071 043/065 040/054 039/052 2/W 20/N 00/B 03/R 36/T 45/R 46/R HDN 071 036/061 032/065 037/077 045/071 045/065 042/061 1/B 60/N 00/U 01/B 34/R 33/R 35/R MLS 068 038/059 035/060 039/073 046/071 046/065 042/061 0/U 40/N 00/U 00/B 12/R 22/R 12/R 4BQ 069 039/058 035/061 040/075 046/072 047/062 042/061 0/U 41/N 00/U 00/B 12/R 33/R 23/R BHK 065 036/056 032/057 035/070 042/070 043/061 038/060 0/U 31/N 00/B 00/U 13/R 22/R 12/R SHR 067 034/058 031/061 036/074 043/068 042/059 038/057 0/U 51/N 00/U 01/B 25/T 55/R 46/R

BYZ WATCHES/WARNINGS/ADVISORIES
MT...None.
WY...None.




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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KBZN37 sm15 minW 0310 smClear30°F19°F64%30.15
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Wind History from BZN
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GEOS Local Image of northern rockey   
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Billings, MT,



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