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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

Clear

Clear

31°F

UV Index
0 Low
Pressure
30.02 Steady
Visibility
8 miles
Dewpoint
26 °F
Humidity
80%
Wind
WNW 1.1 mph
Gust
2.2 mph
Wind Chill
31 °F

Hourly Forecast

Today
8 AM
31°F
Partly sunny
Today
9 AM
35°F
Intermittent clouds
Today
10 AM
40°F
Intermittent clouds
Today
11 AM
47°F
Intermittent clouds
Today
12 PM
51°F
Partly sunny
Today
1 PM
55°F
Partly sunny
Today
2 PM
58°F
Mostly sunny
Today
3 PM
59°F
Mostly sunny
Today
4 PM
61°F
Partly sunny
Today
5 PM
57°F
Intermittent clouds
Today
6 PM
53°F
Mostly cloudy
Today
7 PM
50°F
Intermittent clouds

7 Day Forecast

Intermittent clouds

Saturday

61 °F

A blend of sun and clouds


Intermittent clouds

Saturday Night

34 °F

Partly cloudy


Mostly cloudy

Sunday

57 °F

Rather cloudy


Rain and snow

Sunday Night

32 °F

Cloudy with a couple of showers; perhaps mixed with snow late


Flurries

Monday

46 °F

Considerable cloudiness and cooler with a couple of snow showers


Mostly clear

Monday Night

25 °F

Clear to partly cloudy


Partly sunny

Tuesday

54 °F

Warmer with sunshine and some clouds


Flurries

Tuesday Night

29 °F

Overcast with a bit of snow


Snow

Wednesday

35 °F

Cloudy and colder with a chance for snow


Snow

Wednesday Night

22 °F

Cloudy with a chance for snow


Sunrise and Sunset

Sunrise
7:32 AM
Sunset
5:56 PM

Based on AccuWeather data