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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – February 16 , 2018

This content was originally published by the Longmont Observer and is licensed under a Creative Commons license.

Forecast Discussion:

The front came through Thursday morning as advertised and temperatures hovered in the 40'sF. Clouds increased in the afternoon as mountain snows began to pick up (hurray for the mountains!). Our chance of rain showers, changing to snow, picked up after 6pm and should end by 4am Friday (a few hours after this post goes live).

The GFS gives us a coating to maybe a lucky inch of snow before dawn today (Figure 1).

The HRRR gives a dusting to maybe a coating by dawn (Figure 2).  Again, not an exciting storm for the low lands. Denver might see an inch or two (by the GFS).

Figure 1: The total snowfall between Thursday PM and Friday AM from the GFS and weather5280.com

Figure 2: The total snowfall between Thursday PM and Friday AM from the HRRR and weather5280.com

The longer range forecast:

We rapidly return to the 50's and then 60'sF for the weekend (nice!) before the Monday storm moves in. The highs on Monday may only be in the lower 20'sF.   Figure 3 is the 500mb upper air forecast map for Monday night.  You can see (in the bands of color) the big trough in the west. We are on the uphill, stormy, side of the "U" shape. Figure 4 is the surface precipitation map with good mountain and NE Plains snow in Colorado. Some model runs give us 3-5" of snow on this storm, but we've been promised that sooo many times before...

Figure 3: The 500mb upper air forecast map (color bands) with surface pressures contour lines (black lines) for late Monday night from the GFS and tropicaltidbits.com

Figure 4: The surface pressures contour lines (black lines) and precipitation (blues = snow, green = rain) for late Monday night from the GFS and tropicaltidbits.com

Current Weather

Light snow

Light snow

32°F

UV Index
0 Low
Pressure
30.34 Falling
Visibility
3 miles
Dewpoint
30 °F
Humidity
94%
Wind
ENE 1.1 mph
Gust
2.2 mph
Wind Chill
32 °F

Hourly Forecast

Today
3 AM
33°F
Cloudy
Today
4 AM
33°F
Snow
Today
5 AM
33°F
Snow
Today
6 AM
33°F
Snow
Today
7 AM
33°F
Cloudy
Today
8 AM
30°F
Flurries
Today
9 AM
32°F
Snow
Today
10 AM
33°F
Cloudy
Today
11 AM
34°F
Cloudy
Today
12 PM
35°F
Cloudy
Today
1 PM
37°F
Cloudy
Today
2 PM
38°F
Cloudy

7 Day Forecast

Rain and snow

Friday

41 °F

Chilly; rain and snow showers in the morning with little or no accumulation followed by rain and drizzle in the afternoon


Snow

Friday Night

30 °F

Periods of wet snow, accumulating 1-3 inches; roads could be slippery


Flurries

Saturday

40 °F

A bit of morning snow with little or no accumulation; otherwise, cloudy and cold; storm total snowfall 1-3 inches; roads could be slippery


Intermittent clouds

Saturday Night

32 °F

A shower in places this evening; otherwise, partly cloudy


Partly sunny

Sunday

63 °F

Partly sunny and warmer


Mostly clear

Sunday Night

40 °F

Mainly clear


Intermittent clouds

Monday

79 °F

Warmer with intervals of clouds and sun


Partly cloudy

Monday Night

40 °F

Partly cloudy


Mostly cloudy

Tuesday

66 °F

Mostly cloudy and not as warm


Intermittent clouds

Tuesday Night

40 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data