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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

32°F

UV Index
1 Low
Pressure
30.32 Steady
Visibility
2 miles
Dewpoint
31 °F
Humidity
94%
Wind
NE 1.1 mph
Gust
1.7 mph
Wind Chill
32 °F

Hourly Forecast

Today
9 AM
34°F
Snow
Today
10 AM
35°F
Cloudy
Today
11 AM
36°F
Cloudy
Today
12 PM
37°F
Cloudy
Today
1 PM
38°F
Cloudy
Today
2 PM
39°F
Cloudy
Today
3 PM
40°F
Cloudy
Today
4 PM
41°F
Cloudy
Today
5 PM
40°F
Cloudy
Today
6 PM
39°F
Rain and snow
Today
7 PM
38°F
Rain
Today
8 PM
37°F
Intermittent clouds

7 Day Forecast

Rain and snow

Saturday

41 °F

Cloudy and cold; a bit of morning snow followed by a rain or snow shower in spots this afternoon; storm total 1-3"; roads could be slippery


Intermittent clouds

Saturday Night

32 °F

Partly cloudy


Partly sunny

Sunday

63 °F

Partly sunny and warmer


Mostly clear

Sunday Night

41 °F

Mainly clear


Intermittent clouds

Monday

79 °F

Warmer with intervals of clouds and sun


Partly cloudy

Monday Night

42 °F

Partly cloudy


Mostly cloudy

Tuesday

66 °F

Mostly cloudy and not as warm; a passing afternoon shower


Intermittent clouds

Tuesday Night

40 °F

Partly cloudy


Mostly sunny

Wednesday

79 °F

Mostly sunny, nice and warm


Intermittent clouds

Wednesday Night

44 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:14 AM
Sunset
7:45 PM

Based on AccuWeather data