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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

92°F

UV Index
2 Low
Pressure
30.07 Falling
Visibility
9 miles
Dewpoint
45 °F
Humidity
19%
Wind
SE 2.9 mph
Gust
6.7 mph
Wind Chill
92 °F

Hourly Forecast

Today
4 PM
92°F
Thunderstorms
Today
5 PM
89°F
Thunderstorms
Today
6 PM
84°F
Thunderstorms
Today
7 PM
80°F
Mostly cloudy
Today
8 PM
81°F
Partly sunny
Today
9 PM
77°F
Partly cloudy
Today
10 PM
74°F
Partly cloudy w/ t-storms
Today
11 PM
71°F
Partly cloudy
Tomorrow
12 AM
69°F
Partly cloudy
Tomorrow
1 AM
68°F
Partly cloudy
Tomorrow
2 AM
65°F
Mostly clear
Tomorrow
3 AM
63°F
Clear

7 Day Forecast

Mostly cloudy w/ t-storms

Monday

95 °F

Some sunshine giving way to clouds with a thunderstorm in the area late this afternoon; thunderstorms can bring hail and damaging winds


Partly cloudy w/ t-storms

Monday Night

59 °F

A thunderstorm in spots this evening; otherwise, clear to partly cloudy; thunderstorms can bring hail and damaging winds


Intermittent clouds

Tuesday

97 °F

Very warm with intervals of clouds and sunshine


Partly cloudy

Tuesday Night

62 °F

Partly cloudy


Partly sunny w/ t-storms

Wednesday

78 °F

Clouds and sun with a thunderstorm in the afternoon; thunderstorms can bring hail and damaging winds


Partly cloudy w/ t-storms

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Mostly cloudy

Thursday

86 °F

Mostly cloudy with a thunderstorm in spots in the afternoon


Partly cloudy

Thursday Night

58 °F

Partly cloudy


Mostly cloudy

Friday

91 °F

Variable cloudiness


Mostly clear

Friday Night

61 °F

Mainly clear


Sunrise and Sunset

Sunrise
5:43 AM
Sunset
8:29 PM

Based on AccuWeather data