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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

Sunny

Sunny

47°F

UV Index
3 Moderate
Pressure
29.86 Falling
Visibility
7 miles
Dewpoint
33 °F
Humidity
57%
Wind
SW 1.1 mph
Gust
3.3 mph
Wind Chill
47 °F

Hourly Forecast

Today
9 AM
53°F
Partly sunny
Today
10 AM
60°F
Partly sunny
Today
11 AM
65°F
Partly sunny
Today
12 PM
69°F
Partly sunny
Today
1 PM
71°F
Partly sunny
Today
2 PM
72°F
Partly sunny
Today
3 PM
72°F
Partly sunny
Today
4 PM
69°F
Partly sunny
Today
5 PM
65°F
Partly sunny
Today
6 PM
60°F
Partly sunny
Today
7 PM
55°F
Partly sunny
Today
8 PM
52°F
Partly cloudy

7 Day Forecast

Partly sunny

Friday

72 °F

Pleasant with some sun; breezy this afternoon


Partly cloudy w/ showers

Friday Night

37 °F

Partly cloudy with a couple of showers late


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