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Longmont Weather Forecast: Mild and dry for a long time

Figure6_10212021
Figure 6: the 16 day precipitation total from the GFS and tropicaltidbits

The Video Forecast for the End of October

In Brief:

A long stretch of mild, dry weather is the story into November. The mountains will get snow and rain.

Forecast Discussion:

Programming note:  I'm taking my first vacation from this column through about November 2nd.  If a big storm materializes, I'll post updates here.  If not, I'll see you in a week and a half!

Things do look very quiet in northeastern Colorado for the foreseeable future (Figure 1). There is a cold front arriving early Tuesday that will bring snow and rain to the mountains. Another front will do the same for the western slopes around Friday.

The big picture involves a ridge that will remain over the West (except when those fronts pass (Figure 2)). Halloween Night, this far out, looks to be just above freezing with a low of 24F occurring by sunrise after a high of 54F and partly cloudy skies.

 

Figure1_10212021
Figure 1: the 10 day graphical forecast from weatherunderground.com for Longmont, CO.

 
Figure2_10212021
Figure 2: the 500mb upper air forecast map for Sunday noon from the GFS and tropicaltidbits.com

The Longer Range Forecast:

Over the next five days, only very light precipitation will fall in the mountains and northeastern plains (Figure 3). Over the next 10 days, I-25 folks still get largely skipped as downslope flow off the mountains with the overall westerly flow will kill rain/snow chances (Figure 4). The snow over the next 10 days will also be limited and not too deep and only in the mountains (Figure 5).  Drawing on the GFS and tropicaltidbits (Figure 6) the next 16 days still looks very dry over the eastern half of the state except for the mountains to our west.  It is a great time for me to take a break!  See you in November.

Figure3_10212021
Figure 3: the 5 day precipitation total from the GFS and weather5280.com
Figure4_10212021
Figure 4: the 10 day precipitation total from the GFS and weather5280.com
Figure5_10212021
Figure 5: the 10 day (10:1 ratio) total snowfall forecast from the GFS and weather5280.com
Figure6_10212021
Figure 6: the 16 day precipitation total from the GFS and tropicaltidbits

 


About the Author: John Ensworth

John Ensworth works from Longmont as the Principle Investigator for the NASA Science Mission Directorate Earth and space science education product review through the IGES (The Institute for Global Environmental Strategies – www.strategies.org).
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Current Weather

Cloudy

Cloudy

49°F

UV Index
0 Low
Pressure
29.93 Falling
Visibility
7 miles
Dewpoint
26 °F
Humidity
40%
Wind
N 0 mph
Gust
4.3 mph
Wind Chill
49 °F

12 Hour Forecast

Today
7 PM
50°F
Mostly clear
Today
8 PM
48°F
Mostly clear
Today
9 PM
47°F
Mostly clear
Today
10 PM
46°F
Mostly clear
Today
11 PM
47°F
Mostly clear
Tomorrow
12 AM
47°F
Partly cloudy
Tomorrow
1 AM
47°F
Intermittent clouds
Tomorrow
2 AM
47°F
Intermittent clouds
Tomorrow
3 AM
47°F
Intermittent clouds
Tomorrow
4 AM
46°F
Intermittent clouds
Tomorrow
5 AM
46°F
Intermittent clouds
Tomorrow
6 AM
46°F
Intermittent clouds

7 Day Forecast

Mostly sunny

Saturday

60 °F

Mild with sunshine and patchy clouds


Partly cloudy

Saturday Night

46 °F

Patchy clouds


Intermittent clouds

Sunday

63 °F

Mild in the morning; otherwise, sun and areas of high clouds


Mostly cloudy

Sunday Night

18 °F

Much colder with thickening clouds


Mostly cloudy

Monday

38 °F

Mostly cloudy and much colder


Mostly cloudy

Monday Night

24 °F

Mostly cloudy


Mostly cloudy

Tuesday

46 °F

Mostly cloudy


Mostly cloudy

Tuesday Night

20 °F

Mostly cloudy


Mostly cloudy

Wednesday

57 °F

Mostly cloudy and not as cool


Showers

Wednesday Night

31 °F

Occasional evening rain and drizzle; otherwise, cloudy


Sunrise and Sunset

Sunrise
7:06 AM
Sunset
4:35 PM

Based on AccuWeather data

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