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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.




Comments

Cloudy

Cloudy

85°F

UV Index
5 Moderate
Pressure
30.04 Falling
Visibility
5 miles
Dewpoint
33 °F
Humidity
15%
Wind
ENE 3.5 mph
Gust
7.3 mph
Wind Chill
85 °F

Forecast


Intermittent clouds

Saturday

87 °F

Sun and clouds; air quality will be unhealthy for sensitive groups


Partly cloudy w/ t-storms

Saturday Night

53 °F

A thunderstorm around early; mainly clear, mild; air quality will be unhealthy for sensitive groups


Partly sunny

Sunday

85 °F

Partly sunny


Mostly clear

Sunday Night

53 °F

Mainly clear


Partly sunny

Monday

86 °F

Partly sunny


Partly cloudy

Monday Night

53 °F

Partly cloudy


Intermittent clouds

Tuesday

84 °F

Intervals of clouds and sun


Intermittent clouds

Tuesday Night

56 °F

Partly cloudy and mild


Partly sunny

Wednesday

82 °F

Partly sunny


Clear

Wednesday Night

51 °F

Clear


Sunrise and Sunset

Sunrise
6:46 AM
Sunset
7:01 PM

Based on AccuWeather data