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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – January 21-22, 2020

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

In Brief:

The previously mentioned mid-week storm is vanishing into the computer-model-ether. We have a mostly dry 7-10 day period ahead of us with a hint of another (fake?) storm coming early next week. Temperatures will remain almost 10F above normal day and night over most of this period.

Forecast Discussion:

Extreme quiet weather warning! While blizzards rage in the middle of the country under record cold, and while repeated snow storms keep hitting the mountains of the Western U.S. states - we stay caught in the quiet middle (Figure 1). Even the western slopes of Colorado are having more excitement than we are.

The cold pouring out of Canada is sitting on the other side of a quasi-stationary boundary (blue line - Figure 2) to our east.

The Longer Range Forecast:

The normal high temperatures for this time of year is about 44F and the normal low is 11F. The entire stretch of the next 10 days sees 50F to almost 60F for highs and the low temperatures range from 25F to above freezing levels around 34F (Figure 3). The storm that we were watching for mid-week will hit the western slopes then reform over Kansas and Oklahoma. Over the next 10 days, two good systems will hit the Colorado mountains. The northern Rockies get hit by up to 2 feet of new snow - Longmont get skipped (Figure 4).

Figure 1: the current surface analysis map from Monday PM and the weatherunderground.com
Figure 2 : the surface temperature anomaly (departure from normal) from the GFS for Monday evening from weather5280.com.
Figure 3: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 4: 10:1 (snow to liquid) snowfall totals through the next 10 days from the GFS and weather5280com for Colorado made Monday afternoon.

Current Weather

Heavy snow

Heavy snow

31°F

UV Index
0 Low
Pressure
30.34 Falling
Visibility
1 miles
Dewpoint
29 °F
Humidity
94%
Wind
ENE 1.1 mph
Gust
1.6 mph
Wind Chill
31 °F

Hourly Forecast

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
Today
3 PM
40°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