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DayCAST: Wed 02/13/19

February 13, 2019 / Ben Castellani

Atmospheric river pummels California, heavy mountain snow in Colorado Today's 500 mb height anomaly and wind map below shows near-perfect zonal (westerly) flow present across Colorado. There is even slight ridging overhead. Look for a high in the upper 50's to near 60 degrees this afternoon. As we eluded to yesterday, a weak storm system will fully pass to the north of …

DayCAST: Tue 02/12/19

February 12, 2019 / Ben Castellani

Welcomed warm-up Not much is happening weather-wise the next two days as Colorado will reside in-between storm systems. As you can see in the 500 mb vorticity map below for this morning, weak ridging is present across the Rockies alongside west-southwest flow. This pattern will hold through Wednesday evening with warmer weather on-tap for our region. How warm are we talking? …

DayCAST: Sun 02/10/19

February 10, 2019 / Andy

Warmer weather in store for today! Below shows the 700 mb low to mid-level pattern across the nation, with relative humidity overlaid. Yet another system will be tracking west to east across Colorado overnight tonight into tomorrow morning. That will lead to another round of light to moderate snow in the High Country. This is evident below with a trough …

DayCAST: Sat 02/09/19

February 9, 2019 / Andy

As mentioned in our DayCAST yesterday, we have a system moving through this evening. This is evident below in the 500 mb vorticity and mid-level pattern below. A deep trough is present over western Oregon. This system will continue to rotate southward over the next day or so. Meanwhile, a weak shortwave embedded in this larger trough will eject through …

DayCAST: Fri 02/08/19

February 8, 2019 / Andy

Another very cold start to our day with clear skies and fresh snow cover on the ground. If you woke up this morning and drove to work, you probably noticed temperatures were again well below zero. This is evident in the HRRR model below, which forecasted much of the area at or below zero, with the coldest region just northeast …

Premium Weather Quiz Very Cold Air & the Impact on the Stratosphere

February 7, 2019 / BoulderCAST Team

BACKGROUND: Weather headlines this week are dominated by the historic Arctic air surging southward into the Midwest and Northeast. Some areas will be seeing their coldest temperatures in more than 20 years! The GFS 800 mb temperature map below shows where the coldest air is currently located. A property of cold air which you may not have considered is how dense it is …

DayCAST: Thu 02/07/19 (Updated)

February 7, 2019 / Ben Castellani

Snow is done, cold lingers Light snow wrapped up after midnight last night for most areas. It looks like 2-4" around Denver, and 4 to 7" towards Boulder. We'll discuss the totals more in-depth in another post soon. The story now becomes the bitter cold. This morning's low temperature was -5 degrees at BoulderCAST Station, the coldest day so far this …