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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – November 30, 2018

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

Forecast Discussion:

Snow has begun in western Colorado Thursday (Figure 1) and will increase today (Figure 2). The cool down has begun. We hit 60°F on Wednesday, only 51°F on Thursday and should only see 45°F today. Night time temperatures will sink into the teens again (Figure 3).

We will also see a chance of afternoon rain probably changing over to light snow showers before it tapers off later tonight. IF lucky, we may see 1/10th of an inch of water and a dusting of snow.

Figure 1: The current surface analysis map from Thursday PM and from weatherunderground.com

Figure 2: The forecast surface map for Friday PM. From NCEP.

Figure 3: the graphical forecast for the next 10 days forecast for Longmont, CO from weatherunderground.com

The longer range forecast:

Our next storm will be pretty snowy for the western slopes and mountains, but down-slope flow will limit the precipitation on Sunday (Figure 3). Light snow showers will begin pre-dawn on Sunday and continue into Monday early AM. The Monday commute may be a bit slick next week.

Figure 4 shows the weekend snow, according to the GFS, as being only about a coating to an inch. Figure 5, from the NAM shows maybe 1-2 inches. Weatherunderground's model has only a dusting (not really enough to measure, it thinks).

The fantasy Christmas Forecast:

With 27 days to go, we can look at the goofy forecasts that very long range models attempt to create. Between now and Christmas, from Accuweather, we don't rise to the 50's F again until around 12/12-12/14. By 12/19 we sink to the 30's F for highs again.

This model does not create any big snows between now and then. Christmas Eve is sunny with a high of 34°F a low of 2°F. Christmas Day has a high of 42°F and a low of 9°F.

We'll see!

Figure 4: The forecast accumulated snow map from the GFS and weather5280.com for Colorado, through Monday AM. Longmont is the pink dot, as always.

Figure 5: The forecast accumulated snow map from the NAM and tropicaltidbits.com for Colorado, through Monday AM. Longmont is the pink dot, as always.

Current Weather

Mostly cloudy

Mostly cloudy

38°F

UV Index
0 Low
Pressure
30.21 Rising
Visibility
8 miles
Dewpoint
31 °F
Humidity
74%
Wind
ESE 1.6 mph
Gust
3.8 mph
Wind Chill
38 °F

Hourly Forecast

Today
3 AM
39°F
Showers
Today
4 AM
38°F
Partly cloudy
Today
5 AM
38°F
Partly cloudy
Today
6 AM
37°F
Partly sunny
Today
7 AM
39°F
Partly sunny
Today
8 AM
42°F
Mostly sunny
Today
9 AM
45°F
Mostly sunny
Today
10 AM
49°F
Mostly sunny
Today
11 AM
53°F
Mostly sunny
Today
12 PM
55°F
Mostly sunny
Today
1 PM
59°F
Mostly sunny
Today
2 PM
61°F
Partly sunny

7 Day Forecast

Mostly cloudy w/ showers

Friday

76 °F

Some sun, then increasing clouds, becoming breezy in the afternoon with a shower in spots late


Partly cloudy w/ showers

Friday Night

37 °F

Partly cloudy with a couple of showers


Partly sunny

Saturday

66 °F

Partly sunny and not as warm


Mostly clear

Saturday Night

40 °F

Clear to partly cloudy


Mostly cloudy

Sunday

76 °F

Mostly cloudy and warmer; breezy in the afternoon


Mostly cloudy

Sunday Night

47 °F

Rather cloudy; breezy late


Windy

Monday

60 °F

Very windy; cloudy and cooler


Intermittent clouds

Monday Night

43 °F

Partly cloudy


Intermittent clouds

Tuesday

62 °F

Windy with times of clouds and sun


Partly cloudy

Tuesday Night

36 °F

Partly cloudy


Sunrise and Sunset

Sunrise
5:57 AM
Sunset
7:58 PM

Based on AccuWeather data