Skip to content
Join our Newsletter

Saturday Update: Longmont Weather Forecast: Cooler with small shower chances

In Brief:

Cooling to normal with less smoke - and a tiny chance of rain.

Saturday Update:

Our first of two cold fronts arrives around 4pm Saturday.  Clouds will increase, winds will pick up, and noticeably cleaner air will pour into the state. The next cold front arrives Monday afternoon (see Figure 2 update blue lines), clears the air more and cools us to below normal temperatures for once.  Keep your fingers crossed if you want rain.

Figure2u_09112021
Figure 2 update: the 10 day graphical forecast for Longmont from weatherunderground.com

End Saturday update.

 

Thursday Update:

The heat peaks today (Friday).  The old record high temperature for Thursday was 94 F set in 1994.  It looks like the airport hit  95 F.   The record high for Friday is 93 F set in 1993. We are expecting about 98 to 100F.  Feel the Sizzle.  Smoke will be pretty thick Friday as well (Figure 1 update) but will begin to thin a bit on Saturday (Figure 2 update). Hang on, Fall IS coming.

Figure1u_09092021
Figure 1 update: The HRRR smoke forecast at all levels for Friday noon from NOAA.
Figure2_09092021
Figure 2 update: The HRRR smoke forecast at all levels for Saturday noon from NOAA.

 

End Thursday Update.

Forecast Discussion:

A ridge is returning to the West as moisture leaves.  There is still a small chance of a storm or two in the afternoon Saturday (Figure 1). There will be a moderate amount of smoke as most of the thicker smoke remains just to our north (barely - Figure 2). Figure 3 shows nearly cloudless skies, above normal temperatures, and no rain chances for the next 5-7 days.

Figure1_09042021
Figure 1: the SPC storm forecast for Saturday from NOAA.

 

Figure2_09042021
Figure 2: the HRRR smoke forecast at all levels for noon Sunday from NOAA.

 

Figure3_09042021
Figure 3: the 10 day graphical forecast for Longmont from weatherunderground.com

The Longer Range Forecast:

The ridge wanders around the West until it settles overhead by Thursday (Figure 4) taking us to highs pretty close to 100F! Over the next 5 days, there will be almost no rain statewide (Figure 5).  It will get cold and icy around here soon, go enjoy this weather!

 

Figure4_09042021
Figure 4: the 500mb upper air forecast map for Thursday noon from tropical tidbits.
Figure5_09042021
Figure 5: the 5 day precipitation total for Colorado 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.
Read more


Comments


Current Weather

Thunderstorm

Thunderstorm

61°F

UV Index
2 Low
Pressure
29.65 Rising
Visibility
8 miles
Dewpoint
36 °F
Humidity
39%
Wind
NNE 7.3 mph
Gust
15.9 mph
Wind Chill
61 °F

Hourly Forecast

Today
4 PM
69°F
Cloudy
Today
5 PM
64°F
Mostly cloudy
Today
6 PM
59°F
Mostly cloudy
Today
7 PM
52°F
Thunderstorms
Today
8 PM
51°F
Cloudy
Today
9 PM
50°F
Cloudy
Today
10 PM
49°F
Cloudy
Today
11 PM
48°F
Cloudy
Tomorrow
12 AM
49°F
Cloudy
Tomorrow
1 AM
48°F
Cloudy
Tomorrow
2 AM
48°F
Cloudy
Tomorrow
3 AM
47°F
Cloudy

7 Day Forecast

Partly sunny w/ t-storms

Wednesday

74 °F

Cooler with sunshine giving way to clouds; windy this afternoon with a thunderstorm in the area late; elevated fire risk due to gusty winds and low humidity


Cloudy

Wednesday Night

45 °F

Overcast


Intermittent clouds

Thursday

68 °F

Windy with intervals of clouds and sunshine


Mostly cloudy

Thursday Night

46 °F

Overcast in the evening, then partly cloudy late


Intermittent clouds

Friday

73 °F

Beautiful with times of clouds and sun


Mostly cloudy

Friday Night

44 °F

Mostly cloudy


Mostly cloudy

Saturday

75 °F

Mostly cloudy


Intermittent clouds

Saturday Night

45 °F

Clearing


Mostly cloudy w/ showers

Sunday

71 °F

Turning cloudy with a couple of showers in the afternoon


Mostly cloudy

Sunday Night

44 °F

A thunderstorm in parts of the area in the evening; otherwise, mostly cloudy


Sunrise and Sunset

Sunrise
5:46 AM
Sunset
8:08 PM

Based on AccuWeather data