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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
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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

Sunny

Sunny

24°F

UV Index
0 Low
Pressure
30.3 Steady
Visibility
9 miles
Dewpoint
15 °F
Humidity
69%
Wind
W 2.2 mph
Gust
2.7 mph
Wind Chill
24 °F

Hourly Forecast

Today
8 AM
35°F
Mostly sunny
Today
9 AM
39°F
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Today
10 AM
43°F
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Today
11 AM
46°F
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Today
12 PM
49°F
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1 PM
52°F
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2 PM
55°F
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3 PM
57°F
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4 PM
54°F
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Today
5 PM
51°F
Mostly clear
Today
6 PM
47°F
Mostly clear
Today
7 PM
44°F
Partly cloudy

7 Day Forecast

Mostly sunny

Saturday

57 °F

Mostly sunny and mild; quiet weather for early holiday travelers


Partly cloudy

Saturday Night

35 °F

Partly cloudy


Intermittent clouds

Sunday

59 °F

Sun through high clouds and mild


Cloudy

Sunday Night

35 °F

Cloudy


Mostly cloudy

Monday

54 °F

Mostly cloudy and mild


Clear

Monday Night

28 °F

Clear


Mostly cloudy

Tuesday

50 °F

Mainly cloudy


Intermittent clouds

Tuesday Night

29 °F

Partly to mostly cloudy; good weather for Santa


Intermittent clouds

Wednesday

49 °F

Intervals of clouds and sunshine


Intermittent clouds

Wednesday Night

27 °F

Partly cloudy


Sunrise and Sunset

Sunrise
7:20 AM
Sunset
4:38 PM

Based on AccuWeather data