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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – December 3, 2018

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

Forecast Discussion:

The western storm has crashed into the mountains of the West and has diminished to up-slope snows mainly over western Colorado. Some snow and rain may slip over the Rockies before dying from down-slope warming/sinking (Figure 1). Cold air (the center of which is the high pressure slipping south to our east) is most deeply entrenched east of the Rockies today. We may barely break freezing today.

Figure 1: The forecast surface map for Monday noon. From NCEP.

The longer range forecast:

We stay dry and cool this week. Another front/low passes late in the week, but as you can see in Figure 2, the jet stream is far to the south of us. The bulk of the lift and instability will be down in Arizona and New Mexico. We just get the cold air. Figure 3 shows the expected precipitation at the end of the week and it stretches from AZ to TX and beyond.  Sorry, if you were hoping for some good snow around town.

Figure 2: The 500mb forecast upper air analysis for Friday AM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.

Figure 3: The surface precipitation type forecast map from the weather channel for Friday.

Current Weather

Mostly cloudy

Mostly cloudy

53°F

UV Index
0 Low
Pressure
29.93 Steady
Visibility
8 miles
Dewpoint
39 °F
Humidity
58%
Wind
NNE 2.2 mph
Gust
4.2 mph
Wind Chill
53 °F

Hourly Forecast

Today
10 PM
54°F
Intermittent clouds
Today
11 PM
51°F
Mostly clear
Tomorrow
12 AM
49°F
Mostly clear
Tomorrow
1 AM
48°F
Mostly clear
Tomorrow
2 AM
46°F
Mostly clear
Tomorrow
3 AM
45°F
Mostly clear
Tomorrow
4 AM
43°F
Mostly clear
Tomorrow
5 AM
42°F
Mostly clear
Tomorrow
6 AM
39°F
Mostly sunny
Tomorrow
7 AM
41°F
Mostly sunny
Tomorrow
8 AM
47°F
Intermittent clouds
Tomorrow
9 AM
53°F
Intermittent clouds

7 Day Forecast

Intermittent clouds

Saturday

64 °F

Cooler with clouds giving way to some sun


Intermittent clouds

Saturday Night

39 °F

A shower in spots this evening; otherwise, turning out clear


Mostly cloudy

Sunday

78 °F

Cloudy most of the time, breezy and warmer


Mostly cloudy

Sunday Night

47 °F

Rather cloudy and windy


Windy

Monday

60 °F

Very windy; cloudy and cooler


Intermittent clouds

Monday Night

41 °F

Partly cloudy


Intermittent clouds

Tuesday

59 °F

Cool with times of clouds and sun; windy in the afternoon


Partly cloudy

Tuesday Night

32 °F

Partly cloudy


Intermittent clouds

Wednesday

60 °F

Times of clouds and sun


Intermittent clouds

Wednesday Night

35 °F

Partly cloudy


Sunrise and Sunset

Sunrise
5:55 AM
Sunset
7:59 PM

Based on AccuWeather data