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Tuesday Update: Longmont Weather Forecast: Mild and dry for another week...

Figure5_11272021
Figure 5: the 10 day (10:1 ratio) total snowfall forecast from the GFS and weather5280.com

In Brief:

Abnormally warm weather and abnormally dry weather continues.

Tuesday update:

Things continue abnormally dry and fantastically warm (it would be in the 120'sF if this were the peak of summer). There IS a hint of a snowstorm arriving Tuesday to set our new latest snowall and longest snow-free period at DIA.  More later!

End Tuesday Update.

Forecast Discussion:

Sorry, we still don't have rain or snow coming for the I-25 corridor. Temperatures will remain about 20 to 25 degrees above normal (Figure 1).  No significant precipitation is expected over the next 7 days (Figure 1).  This is due to a persistent western U.S. ridge (blue line in Figure 2).

Figure1_11272021
Figure 1: the 10 day graphical forecast from weatherunderground.com for Longmont, CO.
Figure2_11272021
Figure 2: the 500mb upper air forecast map for Sunday noon from the GFS and tropicaltidbits.com

The Long Range Forecast:

The ridge is still somewhat dominant even a week out (Figure 3). The western slopes should get some precipitation (Figure 4) and snow (Figure 5). Not much is expected along I-25 for the next 10 days. 

Figure3_11272021
Figure 3: Figure 1: the 500mb upper air forecast map for Friday noon from the GFS and tropicaltidbits.com
Figure4_11272021
Figure 4: the 10 day precipitation total from the GFS and weather5280.com
Figure5_11272021
Figure 5: the 10 day (10:1 ratio) total snowfall forecast from the GFS and weather5280.com

 


About the Author: John Ensworth

John Ensworth used to work from Longmont as the PI for the NASA through the IGES (The Institute for Global Environmental Strategies). He now teaches technology, algebra, astronomy, meteorology, film school, and Lego robotics to middle/high school.
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Current Weather

Cloudy

Cloudy

14°F

UV Index
0 Low
Pressure
29.76 Rising
Visibility
6 miles
Dewpoint
8 °F
Humidity
77%
Wind
NE 1.6 mph
Gust
3.6 mph
Wind Chill
14 °F

Hourly Forecast

Today
5 PM
16°F
Flurries
Today
6 PM
16°F
Flurries
Today
7 PM
16°F
Cloudy
Today
8 PM
15°F
Cloudy
Today
9 PM
14°F
Snow
Today
10 PM
13°F
Snow
Today
11 PM
12°F
Snow
Tomorrow
12 AM
12°F
Snow
Tomorrow
1 AM
11°F
Cloudy
Tomorrow
2 AM
10°F
Snow
Tomorrow
3 AM
10°F
Snow
Tomorrow
4 AM
8°F
Snow

7 Day Forecast

Flurries

Tuesday

16 °F

Cloudy and much colder with snow flurries; watch for slippery spots early


Snow

Tuesday Night

6 °F

Breezy this evening; frigid with snow and flurries at times, accumulating 1-3 inches; untreated surfaces will be slippery


Snow

Wednesday

14 °F

Occasional morning snow, accumulating 3-6 inches; otherwise, cloudy and cold; storm total snowfall 4-8"; expect slippery travel early, then some improvement


Mostly cloudy w/ flurries

Wednesday Night

-7 °F

An evening flurry or two; otherwise, partly cloudy and frigid; extreme cold can be dangerous for outdoor activities


Intermittent clouds

Thursday

29 °F

Cold with intervals of clouds and sunshine; extreme cold can be dangerous for outdoor activities


Mostly cloudy

Thursday Night

16 °F

Becoming cloudy


Partly sunny

Friday

48 °F

Milder with partial sunshine; an afternoon shower in the area


Snow

Friday Night

23 °F

Snow and flurries at times in the evening; otherwise, low clouds


Dreary

Saturday

32 °F

Colder with low clouds; a snow shower around in the afternoon


Dreary

Saturday Night

14 °F

Low clouds


Sunrise and Sunset

Sunrise
6:59 AM
Sunset
5:31 PM

Based on AccuWeather data