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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – January 13, 2018

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

Forecast Discussion:

The next storm for late Sunday night through Monday is looking a little stronger now. Figure 1 shows the front arriving Sunday afternoon then a stronger push coming in Monday morning. We will be right on the edge of very cold air.  Some model runs have Denver in the low 20's F for Monday while other runs have us in the mid to upper 30's F. Crazy.

The upper air pattern shows how gigantic the ridge to the west of us is (long blue line) and the position of the short wave trough sweeping down from due north overhead on Monday (Figure 2).

To start watching for snow estimates, the GFS puts 1-2" of snow on Longmont by Tuesday.  Note that little tongue of 0.1" to 1" just to our southwest toward Boulder.  Darn down slope.

Figure 1: The 10 day graphical forecast for Longmont from weatherunderground.com

Figure 2: The 500mb upper air forecast map for Monday morning from the GFS.

Figure 3: The snowfall accumulation forecast for the period from Friday night to Tuesday morning from the GFS and weather5280.com

The longer range forecast:

Figure 1 shows temperatures slowly climbing again to above normal by Wed/Thur.  There is another weak system coming for the end of next week.  Tune in again tomorrow!

Current Weather

Cloudy

Cloudy

54°F

UV Index
0 Low
Pressure
29.95 Rising
Visibility
8 miles
Dewpoint
29 °F
Humidity
38%
Wind
NE 8.4 mph
Gust
17.3 mph
Wind Chill
54 °F

Hourly Forecast

Today
7 PM
55°F
Intermittent clouds
Today
8 PM
53°F
Partly cloudy
Today
9 PM
50°F
Partly cloudy
Today
10 PM
47°F
Partly cloudy
Today
11 PM
45°F
Partly cloudy
Tomorrow
12 AM
43°F
Partly cloudy
Tomorrow
1 AM
41°F
Partly cloudy
Tomorrow
2 AM
41°F
Partly cloudy w/ showers
Tomorrow
3 AM
40°F
Partly cloudy w/ showers
Tomorrow
4 AM
39°F
Partly cloudy
Tomorrow
5 AM
39°F
Partly cloudy
Tomorrow
6 AM
37°F
Partly sunny

7 Day Forecast

Partly sunny

Friday

76 °F

Partial sunshine; breezy this afternoon


Partly cloudy w/ showers

Friday Night

37 °F

Partly cloudy with a couple of showers late


Partly sunny

Saturday

66 °F

Not as warm with sun and some clouds


Mostly clear

Saturday Night

39 °F

Clear to partly cloudy


Mostly cloudy

Sunday

76 °F

Mostly cloudy and warmer; breezy in the afternoon


Mostly cloudy

Sunday Night

51 °F

Rather cloudy; windy late


Windy

Monday

60 °F

Winds gusting past 40 mph; cloudy and cooler


Intermittent clouds

Monday Night

43 °F

Breezy in the evening; otherwise, partly cloudy


Intermittent clouds

Tuesday

62 °F

Times of clouds and sun; windy in the afternoon


Intermittent clouds

Tuesday Night

36 °F

Clearing


Sunrise and Sunset

Sunrise
5:57 AM
Sunset
7:58 PM

Based on AccuWeather data