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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 clear

Mostly clear

46°F

UV Index
0 Low
Pressure
30.08 Rising
Visibility
7 miles
Dewpoint
27 °F
Humidity
47%
Wind
N 4.8 mph
Gust
11.6 mph
Wind Chill
44 °F

Hourly Forecast

Today
5 AM
43°F
Partly cloudy
Today
6 AM
42°F
Partly cloudy
Today
7 AM
43°F
Partly sunny
Today
8 AM
45°F
Intermittent clouds
Today
9 AM
47°F
Intermittent clouds
Today
10 AM
50°F
Intermittent clouds
Today
11 AM
53°F
Intermittent clouds
Today
12 PM
56°F
Intermittent clouds
Today
1 PM
58°F
Intermittent clouds
Today
2 PM
60°F
Mostly cloudy
Today
3 PM
61°F
Cloudy
Today
4 PM
63°F
Cloudy

7 Day Forecast

Mostly cloudy

Tuesday

63 °F

Mostly cloudy and cooler


Partly cloudy w/ showers

Tuesday Night

39 °F

A couple of evening showers; otherwise, partly cloudy


Mostly sunny

Wednesday

76 °F

Pleasant and warmer with sunshine and patchy clouds


Partly cloudy

Wednesday Night

41 °F

Patchy clouds


Mostly cloudy

Thursday

75 °F

Turning cloudy, warm; breezy, a thunderstorm around in the afternoon


Cloudy

Thursday Night

48 °F

Considerable cloudiness with a thundershower in parts of the area


Showers

Friday

69 °F

Mostly cloudy with a couple of showers


Thunderstorms

Friday Night

46 °F

Cloudy; thundershowers in the evening, then late-night rain


Showers

Saturday

53 °F

Low clouds and cooler with a couple of showers


Rain

Saturday Night

41 °F

Occasional rain and drizzle


Sunrise and Sunset

Sunrise
6:10 AM
Sunset
7:48 PM

Based on AccuWeather data