Marine Weather and Tides
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
|Sunrise 6:57AM||Sunset 7:57PM||Friday April 3, 2020 6:07 PM MDT (00:07 UTC)||Moonrise 1:26PM||Moonset 3:57AM||Illumination 83%|
7 Day Forecast for Marine Location Near Big Sky, MTHourly EDIT Help
Area Discussion for - Great Falls, MT  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KTFX 032308 AFDTFX
Area Forecast Discussion National Weather Service Great Falls MT 507 PM MDT Fri Apr 3 2020
. Updated Aviation Discussion .
A weather disturbance will move through the area tonight, producing some light snow. It becomes partly cloudy by Saturday afternoon, but another round of light snow will affect the western portions of the region on Sunday. We will have a slow warming trend through the middle of next week, before another round of colder air moves back into the area by next Friday.
Tonight through Saturday night . Upper level disturbance will continue to push from west to east tonight across the region. This will bring scattered snow showers to the region, mainly north of I-90 across central and northern portions. The best concentration of these showers look to come along the Rocky Mountain Front and from Helena to Great Falls to Lewistown. Overall accumulations in the lower elevations will be an inch or less with 1 to 4 inches at the mountains. Given quick nature of this system, low snow totals, and time have held off on any highlights for the time period. For those outdoors or traveling should prepare for winter conditions at times. Winds may also briefly become breezy as this disturbance passes. This disturbance moves eastward early Saturday morning with showers diminishing quickly. The remainder of Saturday looks to be mainly dry with continued below average temperatures underneath weak ridging. This ridge starts to break down overnight Saturday night with perhaps some more scattered snow showers returning by early Sunday morning. Temperatures also appear to improve slightly to near normal temperatures for Saturday night. Anglin
Sunday through next Friday . Expecting a fairly complicated pattern next week as a potent low diving south along the West Coast becomes cut off from the polar jet and meanders over or just offshore the Southwest US. We start the period in SW flow with a short-wave trough moving across the CWA on Sun. Models are not very enthusiastic on moisture with this system, so POPs and QPF were kept fairly low outside of the mountains. A shortwave trough in the polar jet then dives across Montana later Mon into Tues, which may help draw some enhanced moisture northward from the cut- off low and toward the state. For now Chance to Likely POPs were kept in SW MT, with QPF generally kept south of MT-200. Some instability may accompany this surge in moisture, with ensemble mean CAPE around 150 J/kg, so a chance of thunderstorms was put in across SW MT Mon afternoon and evening. From Tuesday onward, there isn't much agreement among models on the overall pattern or the next chance of precip, so POPs were kept on the low side. Temps are forecast to rebound back toward or above normal from mid-week onward, but much of this will depend on the exact details of the upper-level pattern, including what becomes of the cut-off low over the Southwest. -Kredensor
Updated 507 PM MDT Fri Apr 3 2020 (04/00Z TAF Period)
Isolated to scattered convective snow showers can be expected near or over most terminals through about 06z-08z, with the threat lasting longest into the night at KHVR, KLWT, and KHLN. Gusty winds and MVFR/IFR conditions are possible briefly with this activity, though gusty winds become increasingly less likely as the nighttime inversion sets in by 02z-03z this evening. Conditions overall then improve Saturday morning, although some lingering low clouds are possible. Mountain obscuration is possible at times through the forecast period.
PRELIMINARY POINT TEMPS/POPS. GTF 22 40 24 49 / 30 10 0 20 CTB 17 34 21 40 / 30 10 0 30 HLN 25 45 25 54 / 50 20 10 20 BZN 25 45 27 53 / 20 10 10 10 WYS 16 36 19 43 / 30 10 30 30 DLN 23 45 27 49 / 20 0 0 10 HVR 23 37 22 47 / 30 10 0 20 LWT 24 37 23 49 / 40 20 0 30
TFX WATCHES/WARNINGS/ADVISORIES. None.
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|Bozeman, Gallatin Field, MT||38 mi||71 min||SSW 15||10.00 mi||Fair||41°F||16°F||36%||1014.3 hPa|
Link to 5 minute data for KBZN
Wind History from BZN (wind in knots)
|1 day ago||S||W||SE||Calm||NW||NW||N||NW||W||W||W||Calm||SE||SE||SE||Calm||Calm||SE||SE||SE||S|
|2 days ago||Calm||N||NW||Calm||Calm||N||Calm||W||NW||W||W||W||Calm||Calm||N||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm|
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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 Great Falls, MT (20,4,5,8)(on/off)  Help
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