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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

42°F

UV Index
0 Low
Pressure
30.18 Steady
Visibility
4 miles
Dewpoint
41 °F
Humidity
96%
Wind
NNE 2.1 mph
Gust
4.2 mph
Wind Chill
42 °F

Hourly Forecast

Today
11 PM
42°F
Rain
Tomorrow
12 AM
43°F
Rain
Tomorrow
1 AM
43°F
Rain
Tomorrow
2 AM
43°F
Intermittent clouds
Tomorrow
3 AM
43°F
Intermittent clouds
Tomorrow
4 AM
43°F
Intermittent clouds
Tomorrow
5 AM
43°F
Intermittent clouds
Tomorrow
6 AM
43°F
Intermittent clouds
Tomorrow
7 AM
45°F
Intermittent clouds
Tomorrow
8 AM
48°F
Fog
Tomorrow
9 AM
51°F
Fog
Tomorrow
10 AM
56°F
Fog

7 Day Forecast

Showers

Friday

46 °F

A thick cloud cover and chilly with a few showers


Mostly cloudy w/ showers

Friday Night

41 °F

Rain and drizzle this evening; otherwise, low clouds breaking


Mostly cloudy

Saturday

74 °F

Areas of fog in the morning; otherwise, warmer with variable cloudiness


Clear

Saturday Night

41 °F

Clear


Partly sunny

Sunday

80 °F

Very warm with sunshine mixing with some clouds; breezy in the afternoon; elevated fire risk due to gusty winds and low humidity


Partly cloudy

Sunday Night

46 °F

Partly cloudy


Mostly cloudy

Monday

64 °F

Turning cloudy, windy and cooler; a shower in spots in the afternoon


Mostly cloudy

Monday Night

39 °F

Cloudy in the evening, then partly cloudy late


Intermittent clouds

Tuesday

66 °F

Sun and clouds


Mostly clear

Tuesday Night

39 °F

Mainly clear


Sunrise and Sunset

Sunrise
6:08 AM
Sunset
7:49 PM

Based on AccuWeather data