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The Front Range Forecast: A more normal summer

In Brief:

Severe weather on the plains east of I-25, typical summer weather for everyone else.

The Forecast Discussion:

The normal high temperature for I-25 folks is 90F this week (the highest normal high temperature we see in the year). For most of the next 10 days we are close to or a bit below that except for the start of next week (Figure 1). There are low chances of an afternoon storm through Saturday with severe weather just east of I-25 Thursday (Figure 3). That is being kicked off by a ripple traveling through the upper-level flow (Figure 2 - red line over Colorado) and persistent good low-level moisture levels (high dew points).

 

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Figure 1: the 10 day graphical forecast for Denver from weatherunderground.com
figure2_07132023
Figure 2: the 500mb upper air forecast map for Thursday evening from tropicaltidbits and the GFS.
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Figure 3: the severe weather outlook for Thursday from the SPC and NOAA.

The Longer Range Forecast:

The upper air pattern evolves into a 'northwest flow' setup over Colorado after that as a ridge forms over the West (Figure 4). We can get surprise afternoon and evening storms with this pattern. The forecast may be tricky this next week. Keep an eye on the skies for storms that may 'come out of nowhere.'

The expected rainfall over the next 5 days is light and confined to the eastern side of the Rockies (Figure 5).  I'm getting concerned about how long we have not had rain in western Colorado.  Hopefully the U.S. monsoon starts up soon and brings rain/storms back to that side of the state.

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Figure 4: the 500mb upper air forecast map for Sunday noon from tropicaltidbits and the GFS.
figure5_07132023
Figure 5: the 5 day precipitation forecast from weather5280.com

 


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

Partly cloudy

Partly cloudy

66°F

UV Index
0 Low
Pressure
30.35 Rising
Visibility
8 miles
Dewpoint
55 °F
Humidity
67%
Wind
NNE 1.7 mph
Gust
3.3 mph
Wind Chill
66 °F

Hourly Forecast

Today
1 AM
64°F
Intermittent clouds
Today
2 AM
63°F
Clear
Today
3 AM
62°F
Clear
Today
4 AM
60°F
Clear
Today
5 AM
59°F
Clear
Today
6 AM
58°F
Clear
Today
7 AM
61°F
Sunny
Today
8 AM
65°F
Mostly sunny
Today
9 AM
70°F
Mostly sunny
Today
10 AM
76°F
Mostly sunny
Today
11 AM
81°F
Mostly sunny
Today
12 PM
85°F
Mostly sunny

7 Day Forecast

Mostly sunny

Monday

92 °F

Mostly sunny; gusty winds and small hail can accompany any thunderstorm


Partly cloudy w/ showers

Monday Night

58 °F

A passing shower or two this evening; otherwise, clearing


Partly sunny w/ t-storms

Tuesday

93 °F

Mostly sunny and very warm; a thunderstorm around in the afternoon


Clear

Tuesday Night

60 °F

Clear


Sunny

Wednesday

98 °F

Sizzling sunshine and hot; caution advised if outside for extended periods of time


Clear

Wednesday Night

60 °F

Clear


Partly sunny

Thursday

97 °F

Hot with sunshine mixing with some clouds; danger of dehydration and heatstroke if outside for extended periods of time


Partly cloudy

Thursday Night

62 °F

Partly cloudy


Mostly cloudy

Friday

84 °F

Not as hot with clouds and breaks of sun; an afternoon thunderstorm in one or two spots


Mostly clear

Friday Night

59 °F

Mainly clear


Sunrise and Sunset

Sunrise
6:14 AM
Sunset
7:53 PM

Based on AccuWeather data