US PATTERN: Accumulating Las Vegas Snow, -20 In Denver, Rare Near 1060 High Over Montana

Written by on December 30, 2014 in United States of America, Winter 2014/15 with 0 Comments

It’s 2.15am and been on the road much of the day so will make tonight’s post rather brief.

In a nutshell, arctic air is back in the Lower 48 as predicted and watch in the coming days as the cold pool expands and deepens.

Within the next 24 hrs, the GFS sends a rare 1058 to 1060 surface high into Montana.


I believe the last such monstrous high to descend into the Lower 48 was back in 1989.

Temps dropped below 32 degrees in Las Vegas this morning ending a record 381 days above freezing.

Credit: NWS

Credit: NWS

New Years Day snowfall is still on track with the NWS expecting upwards of 3″.

Credit: NWS

Credit: NWS

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GFS forecasted snow cover through 72 hrs.


Here were today’s highs. I believe those sub-zero’s over ND and MN are the first of the season.



Tonight will be coldest of the season and tomorrow will see highs 20-35 below normal. Impressive given that it’s now the end of December when normal are indeed cold.

Tonight’s lows



Tue Highs



Departures from normal are widely 20-30 below normal.


After only barely getting above zero in Denver tomorrow, we may see a low close to -20 Wed AM while parts of Colorado and Wyoming’s High Country may see spots get close to -40.


More tomorrow.

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