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Wednesday Update: Longmont Weather Forecast: Hot and dry now, cool and moist at week's end

Figure1u_9012021
Figure 1 update: the 48 hour precipitation forecast from the GFS and weather5280.com

This Weeks Forecast Video!

In Brief:

Hot and dry through Thursday, then cooling showers return.

Wednesday update:

The GFS shows some precipitation across the state Wednesday and Thursday (Figure 1 update). Amounts are expected to be very light along I-25.

 

Figure1u_9012021
Figure 1 update: the 48 hour precipitation forecast from the GFS and weather5280.com

 

End Wednesday update.

Forecast Discussion:

The ridge is holding on for a few more days. We'll see near record heat through Wednesday (Figure 1).  The upper air flow will also bring California smoke directly into Colorado (Figure 2).  Hang on, much more normal weather is returning soon.

 

Figure1_08292021
Figure 1: the 10 day graphical forecast for Longmont from weatherunderground.com

 

Figure2_08292021
Figure 2: the smoke forecast for Tuesday morning from the HRRR and NOAA. .

 

The Longer-Range Forecast:

A trough approaches at the end of the week shoving the high off to the east (Figure 3).  A rich flow of tropical moisture returns around the western side of that high center (Figure 4). Over the next 5 (Figure 5) and 10 days (Figure 6) some rain showers will begin to dampen the state. The mountains will get the best rain over the next week. Hold on for the relief!

 

 

Figure3_08292021
Figure 3: the 500mb upper air forecast map for noon Wednesday from tropicaltidbits.

 

Figure4_08292021
Figure 4: the precipitatable water anomaly forecast map for noon Wednesday from tropicaltidbits.

 

Figure5_08292021
Figure 5: the 5 day precipitation forecast from the GFS and weather5280.com

 

Figure6_08292021
Figure 6: the 10 day precipitation 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

Cloudy

Cloudy

14°F

UV Index
0 Low
Pressure
29.76 Rising
Visibility
8 miles
Dewpoint
8 °F
Humidity
77%
Wind
ENE 2.2 mph
Gust
3.8 mph
Wind Chill
14 °F

Hourly Forecast

Today
5 PM
16°F
Flurries
Today
6 PM
16°F
Flurries
Today
7 PM
16°F
Cloudy
Today
8 PM
15°F
Cloudy
Today
9 PM
14°F
Snow
Today
10 PM
13°F
Snow
Today
11 PM
12°F
Snow
Tomorrow
12 AM
12°F
Snow
Tomorrow
1 AM
11°F
Cloudy
Tomorrow
2 AM
10°F
Snow
Tomorrow
3 AM
10°F
Snow
Tomorrow
4 AM
8°F
Snow

7 Day Forecast

Flurries

Tuesday

16 °F

Cloudy and much colder with snow flurries; watch for slippery spots early


Snow

Tuesday Night

6 °F

Breezy this evening; frigid with snow and flurries at times, accumulating 1-3 inches; untreated surfaces will be slippery


Snow

Wednesday

14 °F

Occasional morning snow, accumulating 3-6 inches; otherwise, cloudy and cold; storm total snowfall 4-8"; expect slippery travel early, then some improvement


Mostly cloudy w/ flurries

Wednesday Night

-7 °F

An evening flurry or two; otherwise, partly cloudy and frigid; extreme cold can be dangerous for outdoor activities


Intermittent clouds

Thursday

29 °F

Cold with intervals of clouds and sunshine; extreme cold can be dangerous for outdoor activities


Mostly cloudy

Thursday Night

16 °F

Becoming cloudy


Partly sunny

Friday

48 °F

Milder with partial sunshine; an afternoon shower in the area


Snow

Friday Night

23 °F

Snow and flurries at times in the evening; otherwise, low clouds


Dreary

Saturday

32 °F

Colder with low clouds; a snow shower around in the afternoon


Dreary

Saturday Night

14 °F

Low clouds


Sunrise and Sunset

Sunrise
6:59 AM
Sunset
5:31 PM

Based on AccuWeather data