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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

Partly cloudy

Partly cloudy

58°F

UV Index
0 Low
Pressure
29.9 Steady
Visibility
8 miles
Dewpoint
42 °F
Humidity
56%
Wind
NW 4 mph
Gust
9.1 mph
Wind Chill
58 °F

Hourly Forecast

Today
12 AM
55°F
Partly cloudy
Today
1 AM
52°F
Partly cloudy
Today
2 AM
50°F
Mostly clear
Today
3 AM
47°F
Mostly clear
Today
4 AM
45°F
Clear
Today
5 AM
43°F
Mostly clear
Today
6 AM
41°F
Mostly clear
Today
7 AM
45°F
Partly sunny
Today
8 AM
50°F
Partly sunny
Today
9 AM
55°F
Partly sunny
Today
10 AM
62°F
Intermittent clouds
Today
11 AM
66°F
Intermittent clouds

7 Day Forecast

Mostly sunny

Wednesday

75 °F

Mostly sunny, pleasant and warmer


Partly cloudy

Wednesday Night

41 °F

Patchy clouds


Mostly cloudy w/ t-storms

Thursday

75 °F

Turning cloudy, warm; breezy, a thunderstorm around in the afternoon


Thunderstorms

Thursday Night

49 °F

A thunderstorm in spots in the evening; otherwise, considerable cloudiness


Thunderstorms

Friday

70 °F

Mostly cloudy with a couple of thundershowers


Thunderstorms

Friday Night

46 °F

Cloudy with a couple of thundershowers


Rain

Saturday

50 °F

Chilly with periods of rain and a thunderstorm


Rain and snow

Saturday Night

39 °F

Cloudy with rain, mixed with a little snow late


Mostly cloudy

Sunday

59 °F

Mostly cloudy with a stray thundershower in the afternoon


Partly cloudy

Sunday Night

36 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:08 AM
Sunset
7:49 PM

Based on AccuWeather data