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Longmont Weather Forecast 6/29-30/2020

In Brief:

Heat is interrupted by a passing trough Tuesday/Wednesday to be replaced by days of above normal heat again with daily thunderstorm chances.

Forecast Discussion:

No large scale storms are in the offing, but there is a fair amount of (mainly) Pacific moisture in place across our region (Figure 1 in the gallery). Daily afternoon storms, forming in the mountains and wandering eastward, will be the rule.  For Tuesday/Wednesday, a trough passes the state (with most of the cold air aloft remaining north of Colorado (Figure 2)).  This will cool us to normal temperatures and enhance the afternoon storm chances a bit (green circle Figure 3). The fires in the southwest are are being brought under control so we are seeing much less smoke/haze around northern Colorado (Figure 4). Rainfall, according to the GFS, is very light and spotty over the next 5 days (Figure 5).

The Longer Range Forecast:

By Thursday, a ridge reestablishes itself over the West. By Saturday the entire nation is under a ridge coast to coast (Figure 6). We return to high temperatures in the mid 90'sF most days with afternoon storm chances (Figure 3).  Unfortunately, fire weather conditions will be elevated and these storms might produce some lightning sparked fires.

Independence Day:

We will have a big ridge over most of the U.S. for Independence Day with high in the lower 90'sF and a fair chance of an afternoon thunderstorm. Summer and typical 4th of July weather.


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
29.62 Falling
Visibility
8 miles
Dewpoint
43 °F
Humidity
80%
Wind
SW 2.2 mph
Gust
4.9 mph
Wind Chill
49 °F

Hourly Forecast

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
Today
4 PM
67°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