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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – December 10, 2017

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

Forecast Discussion:

We enter an extended period of very temperate weather - with temperatures about 10-20 degrees above normal day and night. Like yesterday (Figure 1) high pressure dominates the entire western 1/2 of the nation.  The upper air pattern (Figure 2) shows that giant ridge in the west that is keeping us dry and warm for the week.

Figure 1: Current surface map from the weather channel from Saturday PM.

Figure 2: The 500mb upper air forecast map for Sunday Morning from the GFS.

The longer range forecast:

The next hint of something changing comes as a deeper trough links up with the deep south trough in Figure 2 (see Figure 3) for Saturday AM. Hopefully this will begin a pattern change that will make it feel more like winter around here.

Figure 4, though, is the total precipitation between now and Christmas Eve for the U.S. (Longmont is the pink dot). There is very little precipitation expected for California (bad new) up into western Kansas (except for the western slopes of Colorado).

Figure 3: The 500mb upper air forecast map for next Saturday Morning from the GFS.

Figure 4: The total precipitation between now and Sunday morning Christmas Eve (12/24) from the GFS at tropical tidbits.

Current Weather

Sunny

Sunny

40°F

UV Index
2 Low
Pressure
29.87 Steady
Visibility
8 miles
Dewpoint
33 °F
Humidity
73%
Wind
WSW 1.1 mph
Gust
2.2 mph
Wind Chill
40 °F

Hourly Forecast

Today
8 AM
41°F
Partly sunny
Today
9 AM
51°F
Partly sunny
Today
10 AM
58°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
Today
7 PM
55°F
Partly sunny

7 Day Forecast

Partly sunny

Friday

72 °F

Pleasant with partial sunshine; 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