Skip to content

Update 11am 7/3: Longmont Weather Forecast 7/1-3/2020

The video forecast for the week begining 9/15/2020.

In Brief:

A big ridge aloft will settle in for a long stretch of summer while moisture in the lower atmosphere will allow daily thunderstorms to roll by every afternoon (mostly).

Update 7/3 11am:

A bit more moisture is flowing into the state.  Watch for afternoon storm coverage to increase for the next few days.  Figure 1 update in the gallery above shows thunderstorms forming in the evening over all of the Colorado Rockies. These will move to the east adding lightning to the moon lit sky and the fireworks that are going off.  Stay dry, watch out for lighting!

There IS a marginal risk (1 on a scale of 1-5) just about 10-25 miles east of I-25 Friday and Saturday (and eastward out on the Plains).  The SPC is placing the I-25 cities under a marginal risk Sunday, the main threat is for hail and high winds.

End 7/3 11am update.

Forecast Discussion:

Here comes the ridge. Starting this forecast period the ridge has migrated to a Texas to Minnesota line with southwest flow aloft over Colorado (Figure 1 in the gallery). There are still some fire activity in northern Arizona that will send a cloud of smoke over northeast Colorado Thursday (Figure 2 and 3).  With no moisture around Thursday, it will be hot and dry.

The Longer Range Forecast:

For the next 10 days we have highs that remain in the 90'sF. Moisture feeds back into the state beginning Friday (Figure 4).  Daily thunderstorm chances continue for the next week. By Saturday and Sunday, the ridge axis is draped across our state with weak north winds that will lower the highs to around 90-91F over the weekend (Figure 5). The abnormal amounts of atmospheric moisture is pooling nicely over the state for the weekend giving us better thunderstorm coverage around the region (Figure 6).

This pattern will hold for a LONG time.  Looking all the way out to NEXT Saturday (July 11th), the ridge is dominating the entire nation west to east with western flow aloft over northern Colorado (Figure 7). There is still a good amount of low level moisture east of the Rockies that far out (Figure 8).  For the next 5 days, unless a lucky thunderstorm crosses Longmont, we shouldn't see more than minimal rainfall amounts (Figure 9).  Note: with this ridge growing across the country, look for heat wave news stories and lots of complaining people spending more time outside (sidewalk tables?!).

Independence Day Forecast:

Expect slightly cooler temperatures, more humidity, and a better chance of thunderstorms Saturday July 4th spanning the afternoon and on into the evening.  You'll have a full moon and lightning to watch if you take a break from TV fireworks.

The Week beginning July 1, 2020 Video Weather Forecast


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

38°F

UV Index
1 Low
Pressure
29.85 Rising
Visibility
7 miles
Dewpoint
31 °F
Humidity
76%
Wind
SSW 1.9 mph
Gust
4.6 mph
Wind Chill
38 °F

Hourly Forecast

Today
9 AM
41°F
Mostly cloudy
Today
10 AM
44°F
Intermittent clouds
Today
11 AM
47°F
Intermittent clouds
Today
12 PM
49°F
Intermittent clouds
Today
1 PM
51°F
Intermittent clouds
Today
2 PM
52°F
Intermittent clouds
Today
3 PM
52°F
Intermittent clouds
Today
4 PM
51°F
Intermittent clouds
Today
5 PM
50°F
Intermittent clouds
Today
6 PM
47°F
Mostly cloudy w/ showers
Today
7 PM
44°F
Intermittent clouds
Today
8 PM
43°F
Cloudy

7 Day Forecast

Partly sunny w/ showers

Friday

52 °F

Sun and clouds with a couple of showers; cooler


Showers

Friday Night

34 °F

A couple of showers this evening; otherwise, cloudy


Mostly cloudy

Saturday

60 °F

Mostly cloudy


Intermittent clouds

Saturday Night

34 °F

Partly cloudy


Intermittent clouds

Sunday

62 °F

Periods of clouds and sun


Mostly cloudy

Sunday Night

33 °F

Becoming cloudy


Showers

Monday

52 °F

Cloudy and cooler with occasional rain; windy in the afternoon


Intermittent clouds

Monday Night

29 °F

Windy in the evening; partly cloudy


Mostly sunny

Tuesday

61 °F

Mostly sunny and milder


Clear

Tuesday Night

29 °F

Clear


Sunrise and Sunset

Sunrise
6:48 AM
Sunset
7:23 PM

Based on AccuWeather data