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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

Clear

Clear

67°F

UV Index
0 Low
Pressure
30.14 Steady
Visibility
8 miles
Dewpoint
56 °F
Humidity
68%
Wind
WNW 1.7 mph
Gust
2.9 mph
Wind Chill
67 °F

Hourly Forecast

Today
1 AM
65°F
Partly cloudy
Today
2 AM
64°F
Mostly clear
Today
3 AM
62°F
Clear
Today
4 AM
61°F
Clear
Today
5 AM
60°F
Clear
Today
6 AM
58°F
Sunny
Today
7 AM
62°F
Sunny
Today
8 AM
68°F
Mostly sunny
Today
9 AM
74°F
Mostly sunny
Today
10 AM
80°F
Mostly sunny
Today
11 AM
84°F
Mostly sunny
Today
12 PM
87°F
Mostly sunny

7 Day Forecast

Intermittent clouds

Saturday

82 °F

Clouds giving way to sun; high levels of ozone will lead to poor air quality


Mostly clear

Saturday Night

58 °F

A shower in spots late this evening; otherwise, clear to partly cloudy


Partly sunny w/ showers

Sunday

94 °F

Partly sunny with a passing shower in the afternoon


Partly cloudy

Sunday Night

61 °F

Partly cloudy


Mostly cloudy w/ t-storms

Monday

94 °F

Some sun, then increasing clouds with a thundershower in spots in the afternoon


Mostly clear

Monday Night

60 °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

81 °F

Not as warm with times of clouds and sun; a thunderstorm in spots in the afternoon


Intermittent clouds

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Sunrise and Sunset

Sunrise
5:41 AM
Sunset
8:30 PM

Based on AccuWeather data