Forecast By SnowBrains Meteorologist – Eric McNamee
11:20 AM MST, 4/19/2021
A shortwave trough will move through the state today and bring 6-18″ of snow to the Front Range through tomorrow.
Snow will begin later this afternoon and pick up in intensity overnight.
Tomorrow afternoon, snow will taper off as the shortwave moves out of the area.
Some more light accumulations are likely later in the week.
Resorts that look to see the most snow are Loveland, Eldora Mountain, Arapahoe Basin, and Winter Park.
A shortwave trough will move through the state this afternoon and evening, bringing 6-18″ of snow to the Front Range through tomorrow.
Snow will start this afternoon and pick up this evening as dynamics associated with the shortwave trough ramp up.
Scattered snow will continue into tomorrow morning before tapering off by noon.
Conditions will clear briefly before more snow falls across the region Wednesday.
Accumulations will be relatively light Wednesday compared to tonight.
An upper trough extending from the Great Lakes west into MT will be diving down the northern Rockies and across CO tonight. That means we`ll be in the region of synoptic lift during the day today. A strong cold front is charging south down the lee of the Rockies, though there will be two surges associated with it. The first surge has already pushed out of Nebraska and is heading southwest into northeastern Colorado. The GOES Nighttime Microphysics RGB curve and observations show the low stratus surging south. This will continue into the forecast area this morning with a few showers near the northern state border possible. As the first surge hits into the higher terrain, the airmass will deepen, but forecast soundings showing the saturated airmass will be warmer than -10 degrees C, which may allow for patchy drizzle across the plains and into the foothills. With the addition of this low cloud deck, ended up decreasing max temps over most of the plains north of I-70. Late this morning and into the early afternoon, a second surge, associated with 700mb frontogenesis will charge south to deepen the saturated layer and cool it off, allowing for snow production. Areas near the northern state border will likely see this begin around noon to 2pm, with snow surging into the Denver area in the 3pm to 5pm time frame. Temperatures will be rapidly cooling into the 20s. This along with the synoptic and frontogenetical lift, upslope flow and some weak CAPE, should be able to produce some moderate to heavy snowfall heading into the evening. Several models still showing upwards of an inch of liquid for the mountains and higher foothills of Boulder and Larimer counties, while down lower into the western suburbs should see .5 to .8 inches of liquid. The speed of the system will be quick, with the snow event only lasting about 12 hours. Therefore, should see some inch to inch and a half an hour at times for snowfall rates. With the expected amounts happening fairly quickly, will upgrade the Front Range mountains and foothills, as well as the western urban areas such as Boulder down into Golden to a Winter Storm Warning. Expecting hazardous driving conditions to likely develop this evening with heavy snow, rapid cooling and gusty northeasterly winds, with possible snow squall conditions. This has a high potential to impact the evening commute, so travelers are urged to alter plans in the aforementioned areas. -NWS Boulder 4/19/2019
Conditions will clear out again Thursday as the system moves out of the region.
Another weak shortwave will move through Friday, bringing more light accumulations to the state.
By this weekend, high pressure will build over the region and clear conditions out.
Sunday and Beyond:
Global ensembles are indicating below-average precipitation and above-average temperatures across the region in the extended.