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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

Sunny

Sunny

89°F

UV Index
10 Very High
Pressure
30.19 Falling
Visibility
32 miles
Dewpoint
49 °F
Humidity
25%
Wind
SSE 4.4 mph
Gust
10.4 mph
Wind Chill
89 °F

Hourly Forecast

Today
12 PM
90°F
Partly sunny
Today
1 PM
92°F
Partly sunny
Today
2 PM
91°F
Partly sunny w/ t-storms
Today
3 PM
89°F
Partly sunny
Today
4 PM
88°F
Partly sunny
Today
5 PM
87°F
Partly sunny
Today
6 PM
84°F
Partly sunny
Today
7 PM
83°F
Partly sunny
Today
8 PM
79°F
Mostly sunny
Today
9 PM
74°F
Mostly clear
Today
10 PM
70°F
Mostly clear
Today
11 PM
65°F
Mostly clear

7 Day Forecast

Partly sunny w/ t-storms

Saturday

92 °F

Partly sunny; a shower in spots late this morning followed by a thunderstorm in spots this afternoon; thunderstorms can bring hail and damaging winds


Clear

Saturday Night

58 °F

Clear


Partly sunny w/ t-storms

Sunday

91 °F

More sun than clouds with a stray thunderstorm


Mostly clear

Sunday Night

58 °F

Mainly clear


Partly sunny

Monday

90 °F

Partly sunny


Clear

Monday Night

57 °F

Clear


Partly sunny

Tuesday

95 °F

Partly sunny


Clear

Tuesday Night

58 °F

Clear


Mostly sunny

Wednesday

100 °F

Very warm with the temperature tying the record from 2022 with sunshine and a few clouds


Clear

Wednesday Night

61 °F

Clear


Sunrise and Sunset

Sunrise
5:37 AM
Sunset
8:33 PM

Based on AccuWeather data