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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

Light rain

Light rain

62°F

UV Index
0 Low
Pressure
30.01 Falling
Visibility
5 miles
Dewpoint
50 °F
Humidity
66%
Wind
WNW 4.9 mph
Gust
10.8 mph
Wind Chill
62 °F

Hourly Forecast

Today
6 PM
63°F
Thunderstorms
Today
7 PM
62°F
Thunderstorms
Today
8 PM
61°F
Showers
Today
9 PM
59°F
Cloudy
Today
10 PM
59°F
Cloudy
Today
11 PM
59°F
Cloudy
Tomorrow
12 AM
58°F
Cloudy
Tomorrow
1 AM
58°F
Cloudy
Tomorrow
2 AM
57°F
Cloudy
Tomorrow
3 AM
57°F
Cloudy
Tomorrow
4 AM
56°F
Mostly cloudy
Tomorrow
5 AM
56°F
Rain

7 Day Forecast

Thunderstorms

Saturday

75 °F

Mostly cloudy with a thunderstorm in spots this afternoon; thunderstorms can bring hail and damaging winds


Rain

Saturday Night

55 °F

Mostly cloudy; an evening shower in spots followed by occasional rain and drizzle late


Partly sunny

Sunday

77 °F

A morning shower in spots; otherwise, sun and some clouds


Clear

Sunday Night

49 °F

Clear


Partly sunny

Monday

84 °F

Warmer with sunshine and some clouds


Partly cloudy

Monday Night

51 °F

Partly cloudy


Intermittent clouds

Tuesday

76 °F

Pleasant with times of clouds and sun


Mostly cloudy w/ t-storms

Tuesday Night

50 °F

Cloudy in the evening with a couple of showers and a thunderstorm, then partly cloudy late


Mostly cloudy w/ t-storms

Wednesday

75 °F

Some sun, then turning cloudy with a couple of showers and a thunderstorm


Clear

Wednesday Night

47 °F

Clear


Sunrise and Sunset

Sunrise
6:39 AM
Sunset
7:13 PM

Based on AccuWeather data