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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.
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Current Weather

Mostly cloudy

Mostly cloudy

71°F

UV Index
5 Moderate
Pressure
30.2 Falling
Visibility
6 miles
Dewpoint
60 °F
Humidity
68%
Wind
NNE 2.3 mph
Gust
4.4 mph
Wind Chill
71 °F

Hourly Forecast

Today
12 PM
72°F
Mostly cloudy
Today
1 PM
76°F
Mostly cloudy
Today
2 PM
78°F
Mostly cloudy
Today
3 PM
80°F
Mostly cloudy
Today
4 PM
82°F
Mostly cloudy
Today
5 PM
84°F
Intermittent clouds
Today
6 PM
82°F
Intermittent clouds
Today
7 PM
79°F
Intermittent clouds
Today
8 PM
77°F
Intermittent clouds
Today
9 PM
73°F
Partly cloudy
Today
10 PM
69°F
Partly cloudy
Today
11 PM
65°F
Intermittent clouds

7 Day Forecast

Mostly cloudy

Saturday

84 °F

Clouds and breaks of sun; high levels of ozone will lead to poor air quality


Partly cloudy

Saturday Night

58 °F

Partly cloudy


Partly sunny w/ showers

Sunday

94 °F

Partly sunny with a passing shower in the afternoon


Partly cloudy

Sunday Night

61 °F

Partly cloudy


Mostly cloudy

Monday

91 °F

Considerable cloudiness


Mostly clear

Monday Night

60 °F

Clear to partly cloudy


Intermittent clouds

Tuesday

92 °F

Sun through high clouds


Partly cloudy

Tuesday Night

58 °F

Partly cloudy


Intermittent clouds

Wednesday

84 °F

Not as warm with times of clouds and sun; a thunderstorm in spots in the afternoon


Intermittent clouds

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Sunrise and Sunset

Sunrise
5:41 AM
Sunset
8:30 PM

Based on AccuWeather data