Deep leftovers yesterday under blue skies.  It was really good, at least I think it was, I had trouble seeing where I was going. 

Photo of Evan Thayer by John Shafer.  

Today, the next storm is approaching with increasing clouds from north to south and winds picking up as well.  The cold front arrives tomorrow.  Arriving in the far north in late morning then reaching SLC/PC area by afternoon and central/southern Utah overnight.  We expect heavy snowfall Sunday night.  Powder aplenty on Monday.  Snow should continue in a northwest flow Monday into Monday night, particularly in the Cottonwoods.  

Temperatures are going to be very cold behind the front, perhaps the coldest of the season thus far.  So bundle up for powder.  

As for total accumulations, here's what the latest 12km NAM model outputs for the Upper Cottonwoods: 

Over a foot of snow and I think this model is significantly under estimating snowfall, especially in a storm like this.  It's higher resolution sister, the 3km NAM, outputs 35" total.  I think somewhere in the middle is most likely.  I think most mountain locations will be looking at 10-20" of snowfall.  The Cottonwoods which will be favored in NW flow (particularly LCC) could see up to two feet of snow.  At lot will depend on just how productive the post frontal airmass is on Monday into Monday night.  If we are lucky and the NW flow just keeps going like it did on Thursday, we could see more than expected.  If not, we'll see less.  Either way, it's a very good storm, probably the best of the season so far.  

For valleys it will also snow.  I don't really spend much time forecasting for valleys but NWS says 4-8" for lower valleys with 8-16" for mountain valleys and benches.  I've got no reason to doubt that.  Should be a good storm for everybody! 

Please keep in mind that it's President's Day weekend.  If there's one weekend where finally getting a big storm could cause problems it's this.  Lots of travelers, lots of people who are not used to driving in storms, loads of locals alike trying to get up the canyons on Monday morning with a high likelihood of avalanche control.  Be prepared, it will be chaotic in areas.  

We clear out by late Tuesday.  A break in the action for several days.  Weak system could arrive by next weekend with perhaps a stronger follow-up system to start the week of Feb 26th.  

Evan | OpenSnow