Skip to content
Join our Newsletter

Update 7/11 3PM: Longmont Weather Forecast 7/10-12/2020

In Brief:

A summer ridge is in place brining the hottest weather we see in Colorado and no rain for a while.

Update 7/11 3pm:

The heat rolls on, but a surface low and a weak cool front will be drawing in some fairly good moisture (Figure 1 update in the gallery above).  There is plenty of heat - and that spells severe weather!  Storms will be somewhat widely separated but may produce severe weather - hail and high winds - almost back to I-25 on Sunday (Figure 2 update). Stay cool and safe out there.

Tuesday does look interesting with our passing short wave.  We may cool to the 80'sF and see severe weather again.  More later!

End 71/1 3pm update.

Forecast Discussion:

There is a new fire in Utah.  Winds from the west are bringing smoke and particulates our way (Figure 1 in the gallery above).  The NWS has issued air quality alerts because of this. You can see the big blue H for the surface high in Figure 2 and the big upper level ridge with its blue H in Figure 3. That spells heat. In the water vapor satellite image (Figure 4), the red and pink colors are bone dry air.  The storms in Kansas/Oklahoma are powered by northwest flow way over there.

Little will change in the near term.  We should see 102F to maybe 104F Friday. We are in record heat territory.  Hotter locations will occur out on the Plains.  Wowzie. We'll have to check in on the drought index map soon.

The Longer Range Forecast:

We keep hovering around 100F through Tuesday next week (Figure 5). There is a trough that will begin to nudge the ridge eastward Tuesday/Wednesday next week.  That will cool us to the mid 90'sF (oh boy, whoopee - Figure 6). By next Friday, the ridge will stretch from coast to coast but the center will have moved to Tennessee.  We will have strong southwest flow that will create down slope flow (= heating the air).  Next Friday will be another near record hot day (Figure 7).  We do remain dry for the next 5 days (Figure 8).

Note, I'm still getting a bit of vacation//relaxation time in this Independence Day week.  I'm publishing every 3 days temporarily.

The Video Forecast for this 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

Partly cloudy

Partly cloudy

65°F

UV Index
0 Low
Pressure
30.13 Rising
Visibility
9 miles
Dewpoint
30 °F
Humidity
27%
Wind
NNE 3.3 mph
Gust
5.4 mph
Wind Chill
65 °F

Hourly Forecast

Today
9 PM
66°F
Mostly clear
Today
10 PM
64°F
Mostly clear
Today
11 PM
62°F
Clear
Tomorrow
12 AM
60°F
Clear
Tomorrow
1 AM
57°F
Clear
Tomorrow
2 AM
56°F
Clear
Tomorrow
3 AM
55°F
Clear
Tomorrow
4 AM
54°F
Partly cloudy
Tomorrow
5 AM
53°F
Intermittent clouds
Tomorrow
6 AM
51°F
Mostly cloudy
Tomorrow
7 AM
53°F
Mostly cloudy
Tomorrow
8 AM
57°F
Intermittent clouds

7 Day Forecast

Sunny

Monday

86 °F

Warmer with abundant sunshine


Mostly cloudy

Monday Night

51 °F

Thickening clouds


Partly sunny w/ t-storms

Tuesday

76 °F

Not as warm with times of clouds and sun; a thunderstorm in the area in the afternoon; thunderstorms can bring localized damaging wind gusts


Mostly cloudy w/ t-storms

Tuesday Night

51 °F

A thunderstorm in the evening; otherwise, increasing clouds


Mostly cloudy w/ t-storms

Wednesday

68 °F

Some sun, then turning cloudy with a couple of thundershowers in the afternoon


Partly cloudy w/ t-storms

Wednesday Night

47 °F

A couple of showers and a thunderstorm in the evening; otherwise, clearing


Mostly sunny

Thursday

72 °F

Mostly sunny and pleasant


Clear

Thursday Night

47 °F

Clear


Sunny

Friday

81 °F

Sunshine


Mostly clear

Friday Night

47 °F

Mainly clear


Sunrise and Sunset

Sunrise
6:41 AM
Sunset
7:09 PM

Based on AccuWeather data