Skip to content
Join our Newsletter

Thursday Update: Longmont Weather Forecast: More seasonable and mostly dry

The Forecast Video for this Week

In Brief:

Abnormally warm weather for a few days, then a sharp cool down to normal, but dry conditions.

Thursday Update:

Just a quick mid-week update... after a small chance of showers (snow showers??) Thursday PMN, we warm up to abnormally warm (lower 70's highs!) at the start of next week.  A strong (but dry) cold front arrives Tuesday to knock us down to just a few degrees below normal for once.  Still, precipitation is hard to come by for another week along I-25.

Figure1u_11112021
Figure 1 update: the 10 day graphical forecast for Longmont from weatherunderground.com

End Thursday Update.

Forecast Discussion:

You should be outside taking a walk. .. it is fantastically warm this weekend (records may be met or set at DIA- Figure 1).  A trough approaches and settles in over the west giving us more zonal (west to east) and northwest-ish flow.  This pattern change brings in a number of weak cold fronts (blue dashed lines) that takes our high temperatures down to or just a bit above normal (rather than a LOT above normal, which is in the lower 50s right now).

Figure1_11072021
Figure 1: the 10 day graphical forecast from weatherunderground.com for Longmont, CO.

The Longer Range Forecast:

The next real "storm" will bring snow to the mountains, but only very small rain shower chances to the Plains Tuesday PM and Wednesday.  This is in response to a short wave trough (red line in Figure 2) passing early in the week.  Mountain locations in Colorado should pick up a fair amount of overall precipitation (Figure 3) and will mostly fall as snow (Figure 4). There ARE rain chances along I-25 early in the week as the cool down takes place, but amounts should remain light.

Figure2_11072021
Figure 2: the 500mb upper air forecast map for Wed AM from the GFS and tropicaltidbits.com
Figure3_11072021
Figure 3: the 10 day precipitation total from the GFS and weather5280.com
Figure4_11072021
Figure 4: 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.
Read more


Comments


Current Weather

Cloudy

Cloudy

56°F

UV Index
0 Low
Pressure
30.05 Falling
Visibility
7 miles
Dewpoint
47 °F
Humidity
70%
Wind
NW 2.2 mph
Gust
3.9 mph
Wind Chill
56 °F

Hourly Forecast

Today
5 AM
57°F
Mostly cloudy
Today
6 AM
56°F
Intermittent clouds
Today
7 AM
58°F
Intermittent clouds
Today
8 AM
62°F
Intermittent clouds
Today
9 AM
66°F
Intermittent clouds
Today
10 AM
70°F
Intermittent clouds
Today
11 AM
74°F
Mostly cloudy
Today
12 PM
77°F
Cloudy
Today
1 PM
78°F
Cloudy
Today
2 PM
77°F
Cloudy
Today
3 PM
75°F
Cloudy
Today
4 PM
72°F
Cloudy

7 Day Forecast

Thunderstorms

Saturday

78 °F

Mostly cloudy with a thunderstorm in spots this afternoon; thunderstorms can bring localized damaging wind gusts


Showers

Saturday Night

54 °F

Mostly cloudy with occasional rain and drizzle late


Partly sunny

Sunday

78 °F

A morning shower in spots; otherwise, partial sunshine


Clear

Sunday Night

49 °F

Clear


Partly sunny

Monday

84 °F

Partly sunny and warmer


Partly cloudy

Monday Night

51 °F

Partly cloudy


Intermittent clouds

Tuesday

76 °F

Times of clouds and sun


Partly cloudy w/ t-storms

Tuesday Night

48 °F

A couple of evening showers and a thunderstorm; otherwise, partly cloudy


Partly sunny

Wednesday

76 °F

Partly sunny


Clear

Wednesday Night

47 °F

Clear


Sunrise and Sunset

Sunrise
6:39 AM
Sunset
7:13 PM

Based on AccuWeather data