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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – January 9, 2019

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

Forecast Discussion:

High pressure and beautiful (if not unusually warm and dry) skies keep on happening (Figure 1). Our next storm is bashing itself apart against the west coast of North America.

Figure 1: The forecast surface map for Wednesday PM. From NCEP.

The longer range forecast:

When that storm arrives, a weak front will interact with some moisture and give the plains a bit more of a precipitation chance than we've had since just after Christmas. Friday, we might get some measurable precipitation. Weatherunderground's model (Figure 2) labels it as rain, but temperatures will be near the 30's F and will lower once precipitation starts to fall, so it will probably fall as snow. Not much snow though... Figure 3, the GFS suggests a coating to 1 inch around Longmont. Looking out 10 days, that is our only chance here. Figure 4 has the same snow amount for us, but more snow on the western slopes and high mountains (great for them!).

A bonus: an ensemble run from weatherbell looking out 16 days gives us 2-3 inches of snow over the next two weeks. I'm still waiting for that big winter to start! (Figure 5)

Figure 2: the graphical forecast for the next 10 days forecast for Longmont, CO from weatherunderground.com

Figure 3: The forecast accumulated snow map from the GFS and weather5280.com for Colorado, for the next 5 days (through end of weekend).

Figure 4: The forecast accumulated snow map from the GFS and weather5280.com for Colorado, for the next 10 days.

Figure 5: The forecast accumulated snow map from weatherbell.com for the U.S., for the next 16 days.

Current Weather

Mostly clear

Mostly clear

56°F

UV Index
0 Low
Pressure
29.89 Steady
Visibility
8 miles
Dewpoint
45 °F
Humidity
66%
Wind
NNW 4.5 mph
Gust
9.6 mph
Wind Chill
56 °F

Hourly Forecast

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
Today
12 PM
70°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