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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.
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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

Cloudy

Cloudy

90°F

UV Index
3 Moderate
Pressure
30.08 Falling
Visibility
8 miles
Dewpoint
54 °F
Humidity
30%
Wind
NE 3 mph
Gust
6.2 mph
Wind Chill
90 °F

Hourly Forecast

Today
3 PM
92°F
Thunderstorms
Today
4 PM
90°F
Cloudy
Today
5 PM
86°F
Mostly cloudy
Today
6 PM
83°F
Thunderstorms
Today
7 PM
80°F
Mostly cloudy
Today
8 PM
77°F
Partly sunny
Today
9 PM
73°F
Partly cloudy
Today
10 PM
71°F
Partly cloudy w/ t-storms
Today
11 PM
68°F
Partly cloudy
Tomorrow
12 AM
67°F
Partly cloudy
Tomorrow
1 AM
66°F
Partly cloudy
Tomorrow
2 AM
64°F
Mostly clear

7 Day Forecast

Mostly cloudy w/ t-storms

Monday

92 °F

Some sunshine giving way to clouds with a thunderstorm in the area late this afternoon; thunderstorms can bring hail and damaging winds


Partly cloudy w/ t-storms

Monday Night

60 °F

A thunderstorm in spots this evening; otherwise, clear to partly cloudy; thunderstorms can bring hail and damaging winds


Intermittent clouds

Tuesday

96 °F

Intervals of clouds and sunshine


Partly cloudy

Tuesday Night

61 °F

Partly cloudy


Partly sunny w/ t-storms

Wednesday

82 °F

Clouds and sun with a thunderstorm in the afternoon; thunderstorms can bring hail and damaging winds


Partly cloudy w/ t-storms

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Mostly cloudy

Thursday

86 °F

Mostly cloudy with a thunderstorm in spots in the afternoon


Partly cloudy

Thursday Night

58 °F

Partly cloudy


Mostly cloudy

Friday

89 °F

Variable cloudiness


Mostly clear

Friday Night

61 °F

Mainly clear


Sunrise and Sunset

Sunrise
5:43 AM
Sunset
8:29 PM

Based on AccuWeather data