Skip to content

The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – February 2, 2018

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

Forecast Discussion:

We finally had a storm overproduce!  (The second time this winter?) I predicted some rain, freezing rain and a coating to an inch of snow if we were lucky.  We didn't get rain or ice, and all the precipitation that fell was in the form of snow - which added to a full inch at my house.

The ridge is now off in the Pacific Ocean and we have a healthy northwest flow regime (the jet stream is moving from the northwest to the southeast past Colorado/over Colorado).  I've drawn red lines for smaller troughs in the giant trough pattern that dominates most of the US in the maps below.

The longer range forecast:

You can watch the smaller troughs pass on Saturday (Figure 1), Sunday (Figure 2), and off into Tuesday (Figure 3). Each trough will kick off snow in the mountains and bring a slight cooling and maybe a bit snow down here in Longmont.

Figure 4 is the total snowfall through Sunday by the GFS - and we might see up to an inch fall by then.  Details tomorrow!

Figure 1: The GFS upper air forecast map for Saturday AM. Troughs are in red, ridges in blue.

Figure 2: The GFS upper air forecast map for Sunday AM. Troughs are in red, ridges in blue.

Figure 3: The GFS upper air forecast map for Tuesday AM. Troughs are in red, ridges in blue.

Figure 4: The total snowfall forecast from the GFS between Thursday PM and Sunday early morning from weather5280.com

Current Weather

Drizzle

Drizzle

34°F

UV Index
0 Low
Pressure
30.21 Steady
Visibility
2 miles
Dewpoint
32 °F
Humidity
94%
Wind
NNE 2.8 mph
Gust
5.6 mph
Wind Chill
32 °F

Hourly Forecast

Today
9 AM
35°F
Showers
Today
10 AM
36°F
Intermittent clouds
Today
11 AM
38°F
Rain and snow
Today
12 PM
40°F
Intermittent clouds
Today
1 PM
41°F
Intermittent clouds
Today
2 PM
42°F
Cloudy
Today
3 PM
43°F
Cloudy
Today
4 PM
41°F
Cloudy
Today
5 PM
40°F
Cloudy
Today
6 PM
39°F
Rain
Today
7 PM
38°F
Rain
Today
8 PM
37°F
Cloudy

7 Day Forecast

Rain and snow

Friday

43 °F

Chilly with some sun, then turning cloudy; a morning rain or snow shower in spots followed by a little rain this afternoon


Rain and snow

Friday Night

32 °F

Periods of snow; rain mixed in early, accumulating 1-3 inches


Flurries

Saturday

40 °F

A bit of morning snow with little or no accumulation; otherwise, cloudy and chilly; storm total snowfall 1-3 inches


Intermittent clouds

Saturday Night

31 °F

Partly cloudy


Partly sunny

Sunday

64 °F

Partly sunny, pleasant and warmer


Partly cloudy

Sunday Night

41 °F

Partly cloudy


Intermittent clouds

Monday

79 °F

Warmer with a blend of sun and clouds


Partly cloudy

Monday Night

36 °F

Partly cloudy


Intermittent clouds

Tuesday

64 °F

Cooler with periods of clouds and sunshine


Mostly cloudy

Tuesday Night

40 °F

Mostly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data