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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.
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Current Weather

Mostly cloudy

Mostly cloudy

71°F

UV Index
5 Moderate
Pressure
30.2 Falling
Visibility
6 miles
Dewpoint
60 °F
Humidity
68%
Wind
NNE 2.3 mph
Gust
4.4 mph
Wind Chill
71 °F

Hourly Forecast

Today
12 PM
72°F
Mostly cloudy
Today
1 PM
76°F
Mostly cloudy
Today
2 PM
78°F
Mostly cloudy
Today
3 PM
80°F
Mostly cloudy
Today
4 PM
82°F
Mostly cloudy
Today
5 PM
84°F
Intermittent clouds
Today
6 PM
82°F
Intermittent clouds
Today
7 PM
79°F
Intermittent clouds
Today
8 PM
77°F
Intermittent clouds
Today
9 PM
73°F
Partly cloudy
Today
10 PM
69°F
Partly cloudy
Today
11 PM
65°F
Intermittent clouds

7 Day Forecast

Mostly cloudy

Saturday

84 °F

Clouds and breaks of sun; high levels of ozone will lead to poor air quality


Partly cloudy

Saturday Night

58 °F

Partly cloudy


Partly sunny w/ showers

Sunday

94 °F

Partly sunny with a passing shower in the afternoon


Partly cloudy

Sunday Night

61 °F

Partly cloudy


Mostly cloudy

Monday

91 °F

Considerable cloudiness


Mostly clear

Monday Night

60 °F

Clear to partly cloudy


Intermittent clouds

Tuesday

92 °F

Sun through high clouds


Partly cloudy

Tuesday Night

58 °F

Partly cloudy


Intermittent clouds

Wednesday

84 °F

Not as warm with times of clouds and sun; a thunderstorm in spots in the afternoon


Intermittent clouds

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Sunrise and Sunset

Sunrise
5:41 AM
Sunset
8:30 PM

Based on AccuWeather data