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Longmont Weather Forecast: Cool with showers every few days

The Video Forecast for this Week

In Brief:

A cold front will pass about every four days bringing mountain snows, lower level rains and dustings of snow.

Forecast Discussion:

Looking out 10 days (Figure 1) it looks like our next three cold fronts will arrive about four days apart (Thursday, Monday, and maybe the following Saturday). The storm at the start of this forecast window, powered by a cold trough passing overhead (Figure 2) may be able to provide a dusting of snow along I-25 at the end of the period of showers Thursday night.

Figure1_10142021
Figure 1: the 10 day graphical forecast for Longmont from weatherunderground.com
Figure2_10142021
Figure 2: the 500mb forecast map for Thursday noon from tropical tidbits.

 

The Longer-Range Forecast:

After that trough passes, a quickly moving ridge will warm us up and deliver a very comfortable and dry weekend (Figure 1).  A trough will break off under that ridge creating a cut-off low that will bring our next chance of rain and mountain snows Tuesday (Figure 3). 

The first storm will drop a small amount of measurable snow in the mountains, the Palmer Divide and spots on the Plains near Limon (Figure 4). Adding the storm early next week to that map, and the mountains get a better hit of snow (Figure 5). Over the next 10 days, northern and central Colorado will get the best water totals (Figure 6).

Note: I will be on vacation the last week of October and do not plan to post updates unless an epic storm materializes.

 

Figure3_10142021
Figure 3: the 500mb forecast map for Tuesday noon from tropical tidbits.
Figure4_10142021
Figure 4: The 5 day snowfall total (10:1 ratio) from weather5280.com
Figure5_10142021
Figure 5: The 10 day snowfall total (10:1 ratio) from weather5280.com
Figure6_10142021
Figure 6: The 10 day rainfall total from weather5280.com

 


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

Sunny

Sunny

71°F

UV Index
2 Low
Pressure
30.06 Falling
Visibility
10 miles
Dewpoint
32 °F
Humidity
23%
Wind
ENE 2.2 mph
Gust
4.3 mph
Wind Chill
71 °F

12 Hour Forecast

Today
4 PM
73°F
Sunny
Today
5 PM
70°F
Sunny
Today
6 PM
67°F
Sunny
Today
7 PM
63°F
Clear
Today
8 PM
57°F
Mostly clear
Today
9 PM
54°F
Mostly clear
Today
10 PM
53°F
Mostly clear
Today
11 PM
50°F
Mostly clear
Tomorrow
12 AM
49°F
Mostly clear
Tomorrow
1 AM
48°F
Mostly clear
Tomorrow
2 AM
47°F
Mostly clear
Tomorrow
3 AM
46°F
Mostly clear

7 Day Forecast

Sunny

Sunday

73 °F

Pleasant with sunshine


Partly cloudy

Sunday Night

43 °F

Partly cloudy


Partly sunny

Monday

73 °F

Partly sunny and pleasant


Partly cloudy

Monday Night

42 °F

Partly cloudy


Mostly cloudy

Tuesday

59 °F

Mostly cloudy and cooler


Mostly clear

Tuesday Night

31 °F

Mainly clear


Mostly sunny

Wednesday

60 °F

Mostly sunny


Partly cloudy

Wednesday Night

33 °F

Partly cloudy


Mostly sunny

Thursday

66 °F

Sunshine and a few clouds


Clear

Thursday Night

33 °F

Clear


Sunrise and Sunset

Sunrise
7:13 AM
Sunset
6:18 PM

Based on AccuWeather data

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