Advisory Archive
Yesterday, Cooke City picked up 5” of snow while everywhere else got a trace to 1”. Wind is light from the west to north and temperatures at 5 a.m. are 20F under cloudy skies. Temperatures will not rise more than a few degrees above freezing and skies will be mostly cloudy, except Cooke City which may get sun. There may be a few lingering snow showers this morning, but no accumulation is expected. The next few days will be sunny and warm.
Last night the northern Gallatin Range picked up 3” while the mountains around West Yellowstone got 1” and Cooke City 2”. This morning, under mostly cloudy skies, mountain temperatures are 20F and wind is south to southwest at 10-20 mph. Scattered snowfall today and tonight will drop 1-2” of snow with wind remaining southerly and light. Temperatures may rise above freezing and skies will be partly to mostly cloudy with sun poking through at times.
In the last 24 hours, the mountains around West Yellowstone got an inch of new snow with none for the other ranges. Winds were light at 5-15 mph from the west to southwest and this morning, temperatures are in the 20s F. Clouds will increase this afternoon with 1-2” of new snow in the mountains around West Yellowstone and Cooke City and a trace to 1” in the northern ranges by morning. Mountain temperatures will be in the mid to upper 30s and winds will be west to southwest at 5-15 mph.
At the end of the storm yesterday the mountains received 4-6” near West Yellowstone, Big Sky and Cooke City with 2” in Hyalite and the Bridger Range. Yesterday wind was southwest-west at 5-15 mph with gusts to 30 mph. This morning temperatures are teens to low 20s F and wind is 0-10 mph out of the west-southwest. Today, wind will shift west-northwest at 5-10 mph with temperatures reaching high 20s to low 30s F. Skies will clear near Bozeman and Big Sky with cloud cover more likely to the south, and no snow expected.
Since yesterday morning the mountains got 8-11” of new snow near West Yellowstone and Cooke City with 5” near Big Sky and 2” in the Bridger Range and Hyalite. Wind has been south-southeast at 5-15 mph with gusts of 10-30 mph. This morning temperatures are teens to mid-20s F. today temperatures will reach high 20s F with southeast-southwest wind at 15-30 mph. Snow showers will continue, and by this evening expect 3-6” near West Yellowstone and Cooke City with 2-3” near Bozeman and Big Sky.
Overnight, a trace to an inch of new snow fell. Strong winds are out of the southwest to east up with gusts of 30-50 mph. Temperatures are in the teens and low 20s F. Strong winds will continue today out of the south and southeast. Snowfall will start this morning and intensify this afternoon, with 1-3” likely by nightfall. By tomorrow morning, expect 6-12” in the south and 3-6” in the northern mountains. Snow will continue through the day tomorrow.
Yesterday morning, the Bridger Range picked up 1” of new snow, with only a trace across the rest of the advisory area. Overnight, moderate winds shifted from west to east in the Bridger Range. Elsewhere, winds are 10-20 mph out of the south and southwest this morning, but will shift to the southeast today. Temperatures this morning are in the single digits and low teens F. High temperatures will be in the 20s F. Clouds will build this morning with snow showers possible, but no significant accumulations. Heavier snowfall is on the way tomorrow and tomorrow night.
Last night the northern Gallatin Range picked up 7” of new snow with 1” falling around Big Sky, Carrot Basin and Cooke City. West Yellowstone and the Bridger Range were missed. West wind gusted into the 50s yesterday and lessened a bit overnight. Throughout the day, wind will blow from the west to northwest at 10-20 mph with gusts of 30-45 mph. Temperatures dropped abruptly into the teens last night and are only expected to climb into the mid-30s F today. Skies will clear this morning and no new snow is expected until Friday night.
Wet Avalanches
Today’s weather forecast of wind and relatively cool temperatures will keep the wet snow avalanche danger LOW. However, if the temperatures warm towards 40F and the wind lessens and the sun is out, the wet snow avalanche danger could rise to MODERATE. The good news is that it will be obvious: on sunny slopes the surface snow will quickly wet and you will see pinwheels rolling downhill that could trigger loose, wet avalanches.
There is no new snow to report this morning, only wind. A moist westerly flow will keep skies partly to mostly cloudy as west to southwest wind blows steady at 15-30 mph with frequent gusts of 40-50 mph. Temperatures are currently in the mid-20s F and will rise into the 40s today. Tonight temperatures will drop back into the 20s, wind will continue and snow will fall. By morning I expect 1-2” of new snow with Cooke City getting 3-4”. Tomorrow looks to be sunny followed by a wintry weekend of snow, cold temps and wind.
In the last 24 hours, the Northern Madison and the Northern Gallatin Ranges and mountains around Cooke City received 8-10” of new snow and the other ranges received 2-4”. Winds were 10-20 mph from the west and mountain temperatures are in teens to low 20s F. Today skies will become clear with west winds 10-20 mph and temperatures warming into the low 30s F.
WET SNOW AVALANCHES
Since Saturday night the mountains have received 8-14" of new snow. This new snow will rapidly destabilize as it warms up today and natural wet avalanches sliding on this weekend's melt-freeze crust are possible. When it becomes easy to form a snowball with the new snow and you start seeing small pinwheels rolling down slopes, move to shadier aspects because the change from stable to unstable can happen rapidly. Watch Ian's video from Mount Ellis to learn more. Today, the wet snow avalanche danger will increase to CONSIDERABLE and human triggered avalanches are likely.
