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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

Sunny

Sunny

38°F

UV Index
1 Low
Pressure
29.89 Falling
Visibility
7 miles
Dewpoint
31 °F
Humidity
75%
Wind
SSW 1.6 mph
Gust
2.2 mph
Wind Chill
38 °F

Hourly Forecast

Today
7 AM
35°F
Partly sunny
Today
8 AM
42°F
Partly sunny
Today
9 AM
51°F
Partly sunny
Today
10 AM
59°F
Partly sunny
Today
11 AM
64°F
Partly sunny
Today
12 PM
69°F
Partly sunny
Today
1 PM
70°F
Partly sunny
Today
2 PM
72°F
Partly sunny
Today
3 PM
71°F
Partly sunny
Today
4 PM
67°F
Partly sunny
Today
5 PM
62°F
Partly sunny
Today
6 PM
59°F
Partly sunny

7 Day Forecast

Partly sunny

Friday

72 °F

Pleasant with some sun; breezy this afternoon


Partly cloudy

Friday Night

37 °F

Partly cloudy


Partly sunny

Saturday

65 °F

Sun and some clouds


Mostly clear

Saturday Night

41 °F

Clear to partly cloudy


Mostly cloudy

Sunday

76 °F

Mostly cloudy and warmer; breezy in the afternoon


Intermittent clouds

Sunday Night

51 °F

Partly cloudy and breezy


Windy

Monday

60 °F

Winds becoming strong; cloudy and cooler with a shower in spots


Intermittent clouds

Monday Night

43 °F

Breezy in the evening; otherwise, partly cloudy


Windy

Tuesday

62 °F

Strong winds; partly sunny


Partly cloudy

Tuesday Night

36 °F

Partly cloudy


Sunrise and Sunset

Sunrise
5:57 AM
Sunset
7:58 PM

Based on AccuWeather data