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

Cloudy

Cloudy

32°F

UV Index
0 Low
Pressure
29.81 Steady
Visibility
7 miles
Dewpoint
27 °F
Humidity
80%
Wind
NNW 1.1 mph
Gust
2.2 mph
Wind Chill
32 °F

Hourly Forecast

Today
6 AM
34°F
Partly cloudy
Today
7 AM
34°F
Intermittent clouds
Today
8 AM
34°F
Intermittent clouds
Today
9 AM
37°F
Intermittent clouds
Today
10 AM
40°F
Intermittent clouds
Today
11 AM
42°F
Intermittent clouds
Today
12 PM
44°F
Intermittent clouds
Today
1 PM
46°F
Intermittent clouds
Today
2 PM
45°F
Intermittent clouds
Today
3 PM
45°F
Intermittent clouds
Today
4 PM
43°F
Intermittent clouds
Today
5 PM
41°F
Intermittent clouds

7 Day Forecast

Intermittent clouds

Wednesday

46 °F

Intervals of clouds and sunshine


Rain and snow

Wednesday Night

29 °F

Cloudy most of the time with a rain or snow shower in spots


Sunny

Thursday

46 °F

Plenty of sunshine


Mostly cloudy

Thursday Night

32 °F

Clouds breaking


Cloudy

Friday

47 °F

Cloudy


Mostly cloudy w/ showers

Friday Night

30 °F

Mostly cloudy with a shower around after temperatures rise above freezing late


Mostly cloudy

Saturday

52 °F

Some sun, then turning cloudy


Mostly cloudy

Saturday Night

35 °F

Mostly cloudy


Partly sunny

Sunday

56 °F

Partly sunny and mild


Intermittent clouds

Sunday Night

36 °F

Breezy in the evening; otherwise, partly cloudy with a shower in spots late


Sunrise and Sunset

Sunrise
7:21 AM
Sunset
4:41 PM

Based on AccuWeather data