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Longmont Weather Forecast 6/27-28/2020

In Brief:

Heat with daily afternoon (sometimes a bit strong) thunderstorms will be the story for the next week except for a Tue/Wed cool down and better chance of storms for a day.

Forecast Discussion:

Longmont was mostly skipped by the storms and rainfall Friday.  The rainfall totals across town were around 1/10th of an inch on average (Figure 1 in the gallery above). Boulder received about 1/3rd to 1/2 inch overall. There were many storms in northern Colorado, but a monster storm formed west of Castle Rock and drifted southeast towards Colorado Springs (Figure 2).  It did have a tornado warning on it with a velocity couplet visible on radar inside, but no tornado was reported.  There were many hail reports (circled in red Figure 3) and over an inch was recorded where it tracked.

On Saturday, we have another short wave trough coming in from the west (Figure 3) while we sit in the center of an overall large ridge (giving us the heat/90'sF). We still have moisture around.  This moisture plus really warm air and that short wave will give us a marginal risk of severe weather from I-25 eastward for hail and high winds in the few, widely separated, storms that form (Figure 4).

On Sunday, a short wave ridge will enhance the heat a bit as this trough departs.  The southwest flow aloft (Figure 5) will transport a little bit of smoke and haze up into the state Sunday (Figure 6) but the overall flow from the west and an apparent decrease in fire intensity in Arizona will result in clearer skies Monday (Figure 7).

The Longer Range Forecast:

After roasting in the 90's through Monday we do have a cool down Tuesday and Wednesday to the 80'sF and have a better chance of showers/storms on Tuesday (Figure 8). This change mid-week is caused by a larger trough approaching and passing the state (Figure 9).  Storms for the next 5 days will be scattered and many spots will not see any rain (Figure 10).  Other locations near I-25 will get less than 1/10th of an inch on average.  That lucky storm or two may really dump some water, but you will have to win the "thunderstorm lottery" to see much water fall. 

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

Mostly sunny

Mostly sunny

93°F

UV Index
1 Low
Pressure
29.86 Falling
Visibility
8 miles
Dewpoint
42 °F
Humidity
17%
Wind
ESE 3.5 mph
Gust
8 mph
Wind Chill
93 °F

Hourly Forecast

Today
8 PM
88°F
Intermittent clouds
Today
9 PM
83°F
Intermittent clouds
Today
10 PM
79°F
Intermittent clouds
Today
11 PM
75°F
Intermittent clouds
Tomorrow
12 AM
72°F
Intermittent clouds
Tomorrow
1 AM
69°F
Intermittent clouds
Tomorrow
2 AM
68°F
Intermittent clouds
Tomorrow
3 AM
67°F
Intermittent clouds
Tomorrow
4 AM
66°F
Intermittent clouds
Tomorrow
5 AM
65°F
Intermittent clouds
Tomorrow
6 AM
64°F
Intermittent clouds
Tomorrow
7 AM
67°F
Intermittent clouds

7 Day Forecast

Sunny

Thursday

95 °F

Very warm with sunshine


Intermittent clouds

Thursday Night

64 °F

Partly cloudy


Partly sunny w/ t-storms

Friday

89 °F

Partly sunny with a thundershower in spots in the afternoon


Clear

Friday Night

61 °F

Clear


Partly sunny

Saturday

93 °F

Partly sunny


Clear

Saturday Night

56 °F

Clear


Partly sunny

Sunday

89 °F

Partly sunny with a stray thunderstorm


Clear

Sunday Night

57 °F

Clear


Partly sunny

Monday

93 °F

Partly sunny


Clear

Monday Night

57 °F

Clear


Sunrise and Sunset

Sunrise
5:36 AM
Sunset
8:33 PM

Based on AccuWeather data