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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

83°F

UV Index
6 High
Pressure
30.13 Falling
Visibility
9 miles
Dewpoint
35 °F
Humidity
17%
Wind
SE 3.8 mph
Gust
9.1 mph
Wind Chill
83 °F

Hourly Forecast

Today
1 PM
84°F
Mostly sunny
Today
2 PM
85°F
Partly sunny
Today
3 PM
85°F
Mostly cloudy w/ t-storms
Today
4 PM
85°F
Intermittent clouds
Today
5 PM
84°F
Partly sunny
Today
6 PM
81°F
Partly sunny
Today
7 PM
76°F
Intermittent clouds
Today
8 PM
72°F
Mostly clear
Today
9 PM
69°F
Mostly clear
Today
10 PM
65°F
Mostly clear
Today
11 PM
61°F
Clear
Tomorrow
12 AM
59°F
Clear

7 Day Forecast

Partly sunny w/ t-storms

Monday

85 °F

Warmer with sunshine mixing with some clouds; a thunderstorm around this afternoon


Partly cloudy

Monday Night

52 °F

Partly cloudy


Partly sunny w/ t-storms

Tuesday

75 °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

52 °F

A thunderstorm in the evening; otherwise, increasing clouds


Mostly cloudy w/ t-storms

Wednesday

64 °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

44 °F

Mainly clear


Sunrise and Sunset

Sunrise
6:41 AM
Sunset
7:09 PM

Based on AccuWeather data