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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.
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Current Weather

Cloudy

Cloudy

49°F

UV Index
0 Low
Pressure
29.63 Falling
Visibility
8 miles
Dewpoint
43 °F
Humidity
80%
Wind
SW 2.2 mph
Gust
5.3 mph
Wind Chill
49 °F

Hourly Forecast

Today
4 AM
50°F
Showers
Today
5 AM
51°F
Cloudy
Today
6 AM
51°F
Cloudy
Today
7 AM
52°F
Cloudy
Today
8 AM
55°F
Cloudy
Today
9 AM
60°F
Cloudy
Today
10 AM
62°F
Thunderstorms
Today
11 AM
65°F
Cloudy
Today
12 PM
68°F
Cloudy
Today
1 PM
67°F
Thunderstorms
Today
2 PM
70°F
Mostly cloudy
Today
3 PM
68°F
Mostly cloudy

7 Day Forecast

Thunderstorms

Friday

70 °F

Mostly cloudy with a couple of thundershowers


Thunderstorms

Friday Night

45 °F

Cloudy with a couple of thundershowers


Rain

Saturday

48 °F

Chilly with periods of rain and a thunderstorm; travel in the foothills and mountains will be slippery due to snow


Rain and snow

Saturday Night

39 °F

Cloudy with rain, mixed with a little snow late; travel in the foothills and mountains will be slippery due to snow


Mostly cloudy

Sunday

59 °F

Mostly cloudy and warmer


Partly cloudy

Sunday Night

36 °F

Partly cloudy


Partly sunny

Monday

71 °F

Partly sunny, pleasant and warmer


Partly cloudy

Monday Night

45 °F

Partly cloudy


Mostly sunny

Tuesday

73 °F

Mostly sunny, breezy and pleasant


Partly cloudy

Tuesday Night

43 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:06 AM
Sunset
7:51 PM

Based on AccuWeather data