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Longmont Weather Forecast: Seasonable dry weather for the forseeable future

In brief:

We warm to seasonable temperatures with dry conditions looking 10 days out.

Forecast discussion:

A dry trough is zipping past the state on Saturday (Halloween) with northwest flow aloft over the state (Figure 1 below).

 

Figure1_10312020Figure 1: the 500mb upper air forecast map for Saturday noon from the GFS and tropicaltidbits.com

Local fires are still smouldering at a very low level, but upstream fires in other states will send a bit of haze our way (Figure 2).

 

Figure2_10312020Figure 2: the HRRR smoke at all levels forecast map for Saturday (Halloween) afternoon from NOAA.

We will be cooler than normal for the weekend and dry.  A cold front arriving early Saturday morning will kick up winds. Winds in the mountains will blow stronger than firefighters would like Saturday (Figure 3).

 

Figure3_10312020Figure 3: the 10 day graphical forecast from weather5280.com for Longmont, CO.

 

The longer-range forecast:

As the week wears on, a semi-strong ridge will return to the West and central U.S., warming us back to a bit above normal (Figure 4 and 3).

 

Figure4_10312020Figure 4: the 500mb upper air forecast map for Tuesday noon from the GFS and tropicaltidbits.com

Sadly, we remain very dry for the next 10 days. The GFS gives the mountains a light sprinkle about a week from now (Figure 5). Snowfall remains very light in the northern mountains as well (Figure 6).

The Halloween forecast:

At 6 p.m.: The temperature will be 46 degrees with winds from the northeast at 6 to 10mph and clear skies.
At 9 p.m.: The temperature will be 37 degrees with light winds from the east at 3 mph under clear skies and a full moon.

I saw on another site that we've not had a full moon (and Blue Moon — second full moon in a month) on Halloween night since 1944. Strange. Sounds like 2020.

Election Day forecast:

Tuesday will be partly cloudy with a high near 70 degrees and  low near 38. There will be no precipitation and light west winds. You won't notice the weather in Colorado on Election Day.

Figure5_10312020Figure 5: the 10 day precipitation total from the GFS and weather5280.com

 

Figure6_10312020Figure 6: the 10 day snowfall total 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

71°F

UV Index
3 Moderate
Pressure
30.21 Rising
Visibility
6 miles
Dewpoint
53 °F
Humidity
53%
Wind
ENE 1.2 mph
Gust
3 mph
Wind Chill
71 °F

Hourly Forecast

Today
9 AM
76°F
Sunny
Today
10 AM
81°F
Sunny
Today
11 AM
86°F
Sunny
Today
12 PM
89°F
Mostly sunny
Today
1 PM
91°F
Partly sunny
Today
2 PM
92°F
Partly sunny
Today
3 PM
92°F
Mostly cloudy w/ showers
Today
4 PM
93°F
Mostly cloudy
Today
5 PM
93°F
Mostly cloudy
Today
6 PM
91°F
Cloudy
Today
7 PM
89°F
Cloudy
Today
8 PM
85°F
Partly sunny

7 Day Forecast

Mostly cloudy w/ showers

Sunday

93 °F

Thickening clouds with a passing shower this afternoon


Partly cloudy

Sunday Night

64 °F

Partly cloudy


Intermittent clouds

Monday

95 °F

Some sun, then increasing clouds


Mostly clear

Monday Night

59 °F

Clear to partly cloudy


Intermittent clouds

Tuesday

92 °F

Sun through high clouds


Partly cloudy

Tuesday Night

60 °F

Partly cloudy


Intermittent clouds

Wednesday

72 °F

Times of sun and clouds with a thunderstorm in the afternoon; thunderstorms can bring hail and damaging winds


Mostly cloudy

Wednesday Night

58 °F

An evening thunderstorm; otherwise, mostly cloudy


Mostly cloudy

Thursday

86 °F

Warmer with variable cloudiness; a thunderstorm in spots in the afternoon


Intermittent clouds

Thursday Night

58 °F

Clearing


Sunrise and Sunset

Sunrise
5:42 AM
Sunset
8:30 PM

Based on AccuWeather data