Good precipitation chances along with warming temperatures for most of the work week

Sunday, February 18, 2024

After chilly low temperatures of -10 F near the base of the Steamboat Ski Resort and -6 F at the Bob Adams airport this Sunday morning, the base temperature has warmed to the mid-teens under cloudy skies as of noon. A quick-moving disturbance responsible for the clouds this morning will bring light snow showers from this afternoon through this evening ahead of a mostly sunny Washington’s Birthday. But precipitation chances return on Tuesday and Wednesday thanks to a warm and moist pattern that will bring some liquid precipitation to town and snows to the mountain.

A deep low pressure system currently extends from the Gulf of Alaska to the south while a broad ridge of high pressure sits over the Baja peninsula. The low pressure area is composed of two circulation centers; one over the Gulf of Alaska and another off the coast of northern California. A wave of energy and moisture that earlier ejected from the southern low pressure area is currently moving through the Great Basin and should start light snow showers by this afternoon that continue through the evening.

I would expect 1-4” to be reported on the Monday morning mid-mountain ski report along with clearing skies that should bring a mostly sunny day for Washington’s Birthday.

A strong storm currently over the Aleutian Islands is forecast to move to the east and force a complicated reorganization of the low pressure system while that ridge of high pressure over Baja builds over the Desert Southwest early in the work week. Additionally, the southern end of the low pressure system has tapped a band of subtropical moisture in another atmospheric river event that will first bring copious precipitation to most of California on Monday.

There is still considerable weather forecast model disagreement on the proximity of the remnants of the atmospheric river to our area, though the more pessimistic American GFS has trended toward the wetter European ECMWF over the last couple of days thanks to a weaker ridge of high pressure over the Desert Southwest.

If the wetter forecast verifies, we can expect precipitation to start early Tuesday with snow on the hill and snow turning to a rain-snow mix or even all rain in town by Tuesday afternoon. Precipitation will likely revert to snow in town by Tuesday night and we could see 2-5” of dense snow by the Wednesday morning mid-mountain ski report.

Meanwhile, that low pressure off the West Coast will have completed its reorganization and is forecast to quickly move across the West Coast early Wednesday, the Great Basin by midday and near our area by the afternoon. Temperatures should be marginally cooler than Tuesday sparing us the possible rain in town in favor of snow or a rain-snow mix. But a still-dense snow on the hill could leave 2-5” during the day with another 2-5” overnight for a 4-10” Thursday morning mid-mountain report.

Slightly cooler temperatures on Thursday will keep the snow showers at all elevations lingering during the day with some additional accumulations possible on the hill. Snows should end by later Thursday ahead of a transient ridge of high pressure that is currently advertised to bring a mostly sunny weekend. Those few days of nice weather look to be short-lived as the storm door opens again after the weekend thanks to that Aleutian storm and additional upstream energy.

So enjoy the changeable work week weather, and be sure to check back to my next regularly scheduled weather narrative on Thursday afternoon to see if the sunny weekend forecast holds and if the storm pattern for the following work week is still on track.

Snows restart around noon and last through Friday night

Thursday, February 15, 2024

After five inches fell at mid mountain and six inches up top at the Steamboat Ski Resort on Wednesday, cloudy skies and a temperature of 29 F are over the Steamboat Springs area this Thursday midmorning. Two waves of moisture and energy centered on this afternoon and later Friday will bring periods of snow between noon today and Saturday morning with ten to twenty inches of snow expected over the two days. Skies should briefly clear on a cooler Saturday before another weaker wave restarts snow showers later Sunday and overnight.

A compact ridge of high pressure currently sits over the Yukon. One wave of energy and moisture that earlier moved underneath the ridge and across the Gulf of Alaska and eventually the Great Basin is on our doorstep, and moderate to sometimes heavy snow showers are expected to start soon after noon today. We could see 2-5” accumulate at mid mountain during the day and that again during the evening.

Another wave that earlier traveled over the ridge and down the eastern side has formed a small eddy currently over the Pacific Northwest, and part of it is forecast to move over our area later Friday and overnight. Snow showers will decrease or possibly end for a time later tonight and early Friday before they intensify again later Friday and overnight.

This second set of accumulations starting Friday will be fluffier as cold air brought from the Yukon decreases the density, and I would expect 5-10” of snow to be reported on the Saturday morning mid mountain ski report, with some of that falling during the previous day.

Weather forecast models are struggling with the amount of cold air that will be over our area by Saturday morning, with a 75% chance of low temperatures both in town and the mountain between 5 F and 17 F. There are also low chances for subzero temperatures which is an abnormally large range for a a weather forecast only two days away.

We should see the sun reappear by Saturday afternoon for a classic picture perfect powder day before clouds increase by Saturday night as another weak wave of energy and moisture sneaks under the ridge and moves towards our area. Current forecasts have light snow showers starting by Sunday afternoon and continuing overnight with 2-5” possible on the Monday morning report.

So enjoy the snowy start to the long holiday weekend, and what should be a beautiful winter day on Saturday, and check back to my next regularly scheduled weather narrative on Sunday afternoon for an update on the snow totals expected for Monday morning and a look ahead to a possible midweek storm.

A mix of sun and clouds through midweek

Sunday, February 11, 2024

After another three inches of snow fell at the Steamboat Ski Resort by the Sunday morning mid mountain ski report, and an additional inch and a half fell since the report, partly sunny skies are over the Steamboat Springs area late this morning with temperatures around twenty degrees. A mix of sun and clouds and possibly some snow showers are in the weather forecast through midweek ahead of a possible pattern change that could bring significant snows back to our area by the end of the work week.

The last storm of this storm cycle which started late last Wednesday and brought 19” to mid mountain through this morning is currently moving across the Texas Panhandle. Partly sunny skies and cool temperatures will be over our area through Monday, with the high temperature only reaching the mid twenties in town, which is over five degrees below our average of 33 F. If skies can clear before sunrise Monday, low temperatures will fall to around five degrees below our average of 7 F, with likely subzero temperatures in the favored low lying areas of the Yampa Valley.

Warm air ahead of a storm developing south of the Aleutian Islands is forecast to build a ridge of high pressure extending from the Gulf of Alaska northwards through Alaska through the work week. Temperatures will rise toward average by Tuesday and stay there through midweek as winds from the northwest bring weak waves of energy and moisture over our area from later Monday into Tuesday and again Wednesday.

We should see periods of sun between these waves, most likely this afternoon, Monday morning and Tuesday afternoon, with a chance for some snow showers centered between these periods tonight, Monday night and Wednesday. Similar to this morning, any of these showers could leave some minor accumulations.

Major uncertainty emerges by Thursday as weather forecast models agree that the southern end of the Aleutian storm forms an eddy that travels underneath the ridge of high pressure over Alaska and eventually through the Gulf of Alaska, perhaps incorporating subtropical moisture in another atmospheric river event. They also agree that a separate wave of energy and moisture ahead of the storm will travel over the ridge and move south across the interior of British Columbia.

However, there is considerable disagreement on how these pieces interact and how far south the eddy eventually crosses the West Coast. The American GFS has a quicker moving storm staying more to our north starting Thursday and ending Friday while the European ECMWF has a far more substantial and further south event not ending until Saturday.

So enjoy the seasonable start to the work week, and be sure to check back to my next regularly scheduled weather narrative on Thursday afternoon for a more detailed look at the weather for the long Presidents Day weekend.

Weakening storm cycle to end on Sunday

Thursday, February 8, 2024

The 7.5” of new snow at mid mountain and 10” up top at the Steamboat Ski Resort that was reported this Thursday morning has been augmented by around 3” of snow that continued to fall through the morning. We’ve had some peeks of sunshine around noon, but skies are currently overcast this mid afternoon as temperatures hover around 30 F in the town of Steamboat Springs. Snow showers will be around through Saturday as the current storm cycle slowly ends with cool temperatures and sunshine expected by Sunday.

While the storm that brought the snowfall today quickly moves across Minnesota on its way to Canada, several additional upstream storms have carved out a trough of low pressure over the West. Snow showers will continue today in the cool, moist and unstable air mass behind the departing storm leaving 3-6” for the Friday morning report, most of which will have fallen today.

A storm currently near Las Vegas is forecast to move through southern Colorado tomorrow morning, and it should be close enough to restart snow showers over our area by Friday morning. Additionally, a weaker and more disorganized storm passes through Colorado on Saturday which will keep the chance of light snow showers going through the day. I would expect 2-5” for the Saturday morning report, some of which should fall during the day Friday, and 1-4” for the Sunday morning report, most of which should fall during the day Saturday.

Additionally, there is a mass of cold air associated with a final wave currently off the coast of British Columbia. This storm is forecast to quickly move south through the Pacific Northwest early Friday, Nevada later Friday, Ariziona on Saturday and New Mexico on Sunday. While our area won’t see any moisture from this storm, we will see the cold air despite the clearing skies on Sunday, with high temperatures in town falling from the upper twenties on Friday and Saturday to the low twenties by Sunday, which is around ten degrees below our slowly rising average of 33 F.

And our low temperatures will also be on a downtrend from the low teens tonight to the high single digits on Saturday to the low single digits on Sunday. Even colder temperatures around zero or below zero are forecast for Monday morning, which is around five to ten degrees below our average of 7 F.

A ridge of high pressure is then forecast to move over the West early in the work week, but it looks to be weak and disorganized as it interacts with incoming Pacific energy and moisture. Right now, moderating temperatures and more sun than clouds are expected for next week, but be sure to check back to my next regularly scheduled weather narrative on Sunday afternoon for updates to that forecast.

Another storm cycle to start midweek after a short break

Sunday, February 4, 2024

Temperatures at our average of freezing and mostly sunny skies are over Steamboat Springs this Sunday mid afternoon behind the storm that left a two day snowfall total of 21” at mid mountain and 27” up top at the Steamboat Ski Resort. A sunny start to the work week will be followed by another long duration storm cycle that starts by midweek and continues into the weekend.

A large storm currently just off the coast of northern California that extends back southwestward toward Hawaii has incorporated an atmospheric river nicknamed the Pineapple Express, similar to our last storm, that will again bring heavy precipitation to portions of California today and Monday.

A ridge of high pressure has formed ahead of the storm over the Desert Southwest and Great Basin and will be responsible for the clear skies tonight and on Monday. Combined with the fresh snow cover and light winds, low temperatures should fall to around zero degrees in the Yampa Valley, which is around five degrees below our average of 6 F. Expect upper thirties to close to forty degrees on Monday under continued mostly sunny skies.

Meanwhile, the California storm is forecast to elongate to the southwest on Monday before moving east across Nevada and Arizona on Tuesday thanks to a cool storm moving across the Aleutian Islands that will eventually affect our area by Thursday.

Warm and moist air carried northward ahead of the California storm will raise the high temperatures for Tuesday into the low forties while also introducing clouds back into the weather forecast. This storm is then forecast to move northeastward through Colorado on Wednesday and to our northeast by Thursday.

There is a chance that showers could start as soon as Tuesday night or hold off until early Wednesday. This storm will be similar to the last one and start warm. But as the storm moves across Colorado during the day and intensifies to our northeast, winds will turn to be from our favorable northwest by Wednesday afternoon while temperatures cool thanks to the approaching Aleutian storm. Moderate to sometimes heavy snows should occur from Wednesday afternoon through Thursday, with the snowfall becoming fluffier before it tapers off early Friday.

We could see as much as 6-12” of snow at mid mountain by the Thursday morning report with continuing snows during the day and overnight possibly leading to a similar amount by Friday morning. We may see snowfall on Friday briefly stop, or not, as another cool Aleutian storm approaches our area for the weekend festivities of the 111th edition of the Steamboat Springs Winter Carnival.

So enjoy the break in winter weather before the snows restart on Wednesday, and be sure to check back to my next regularly scheduled weather narrative on Thursday afternoon to see an updated snowfall forecast for Friday and how much snow we may expect for the weekend.

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8 March 2018

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