Skip to content
Join our Newsletter

Update 7/5 12pm: Longmont Weather Forecast 7/4-6/2020

In Brief:

A few more days of warmth and afternoon storms will be replaced by HEAT and very few storms.

Update 7/5 12pm:

I hope you had a great Independence Day!   The Storm Prediction Center still has a Marginal risk of severe weather - primarly for strong/damaging thunderstorm straight line winds for this afternoon (see Figure 1 update in the gallery).  After that, the storm chances decrease each day going forward as the heat gets turned up. 

End Update 7/5 12pm.

Forecast Discussion:

We will barely reach 90F today (Independence Day) - enjoy the "cool" air!  Storms will roll off the mountains this afternoon but don't seem to impact Longmont much.  The closest the storms come to our town on the HRRR model is shown in Figure 1 in the gallery above.  After this they move east and the storms to the west of that line fade out into the evening.  There should be very little storm activity around I-25 by 9-10pm (typical fireworks time).

For Sunday, we warm up just a bit and have better moisture in place (Figure 2).  Stronger storms with more overall coverage than Saturday are expected.  The Storm Prediction Center has a Marginal Risk (1 on a scale of 1-5 with 5 being the most severe) back to the I-25 communities.  The primary risk, due to a layer of dry air aloft, is for strong damaging thunderstorm winds.  They are not highlighting hail or tornadoes at this time (Figure 3).

 

The Longer Range Forecast:

The long range is going to be hot and dry.  We have a very large ridge setting up coast to coast across the country by about Monday/Tuesday (example from Wednesday shown in Figure 4). The cool air is trapped north of the jet stream axis (pink arrow in that figure).  We should see a few days top 100F this week and hotter to the southeast.  The storm chances will fizzle. There will be very few storms on any given evening, and then, mainly only up in the mountains.

On a personal note, I'm taking a bit of a break for the holiday weekend.  This post will cover 3 days (I don't plan for that to be a habit except for vacation times). Stay safe out there and stay cool next week.


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.
Read more


Comments


Current Weather

Mostly sunny

Mostly sunny

93°F

UV Index
1 Low
Pressure
29.86 Falling
Visibility
8 miles
Dewpoint
40 °F
Humidity
16%
Wind
ESE 4.5 mph
Gust
9 mph
Wind Chill
93 °F

Hourly Forecast

Today
7 PM
90°F
Intermittent clouds
Today
8 PM
86°F
Intermittent clouds
Today
9 PM
82°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

7 Day Forecast

Partly sunny

Thursday

95 °F

Very warm with sunshine mixing with some clouds


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