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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

Sunny

Sunny

88°F

UV Index
10 Very High
Pressure
30.14 Steady
Visibility
8 miles
Dewpoint
56 °F
Humidity
33%
Wind
ESE 2.4 mph
Gust
5.1 mph
Wind Chill
88 °F

Hourly Forecast

Today
1 PM
90°F
Partly sunny
Today
2 PM
92°F
Mostly cloudy
Today
3 PM
93°F
Mostly cloudy
Today
4 PM
91°F
Mostly cloudy
Today
5 PM
87°F
Mostly cloudy
Today
6 PM
83°F
Thunderstorms
Today
7 PM
80°F
Mostly cloudy
Today
8 PM
77°F
Partly sunny
Today
9 PM
73°F
Partly cloudy
Today
10 PM
71°F
Partly cloudy w/ t-storms
Today
11 PM
68°F
Partly cloudy
Tomorrow
12 AM
67°F
Partly cloudy

7 Day Forecast

Mostly cloudy w/ t-storms

Monday

93 °F

A shower in spots late this morning, then a thunderstorm in spots late this afternoon; thunderstorms can bring hail and damaging winds


Partly cloudy w/ t-storms

Monday Night

60 °F

A thunderstorm in spots this evening; otherwise, clear to partly cloudy; thunderstorms can bring hail and damaging winds


Intermittent clouds

Tuesday

96 °F

Intervals of clouds and sunshine


Partly cloudy

Tuesday Night

61 °F

Partly cloudy


Partly sunny w/ t-storms

Wednesday

82 °F

Clouds and sun with a thunderstorm in the afternoon; thunderstorms can bring hail and damaging winds


Partly cloudy w/ t-storms

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Mostly cloudy

Thursday

86 °F

Mostly cloudy with a thunderstorm in spots in the afternoon


Partly cloudy

Thursday Night

58 °F

Partly cloudy


Mostly cloudy

Friday

89 °F

Variable cloudiness


Mostly clear

Friday Night

61 °F

Mainly clear


Sunrise and Sunset

Sunrise
5:43 AM
Sunset
8:29 PM

Based on AccuWeather data