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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.

figure4_07132023
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

Clear

Clear

45°F

UV Index
0 Low
Pressure
30.31 Steady
Visibility
8 miles
Dewpoint
40 °F
Humidity
84%
Wind
WNW 1.1 mph
Gust
5 mph
Wind Chill
45 °F

Hourly Forecast

Today
4 AM
45°F
Mostly clear
Today
5 AM
44°F
Mostly clear
Today
6 AM
44°F
Mostly sunny
Today
7 AM
47°F
Mostly sunny
Today
8 AM
53°F
Intermittent clouds
Today
9 AM
59°F
Intermittent clouds
Today
10 AM
64°F
Intermittent clouds
Today
11 AM
68°F
Intermittent clouds
Today
12 PM
71°F
Partly sunny
Today
1 PM
73°F
Partly sunny
Today
2 PM
75°F
Partly sunny
Today
3 PM
75°F
Intermittent clouds

7 Day Forecast

Mostly sunny

Thursday

71 °F

Sunny to partly cloudy, pleasant and warmer


Clear

Thursday Night

44 °F

Clear


Partly sunny w/ t-storms

Friday

76 °F

Sun and clouds with widely separated thunderstorms this afternoon


Mostly clear

Friday Night

46 °F

Clear to partly cloudy


Mostly sunny

Saturday

80 °F

Sunny to partly cloudy and warm


Mostly clear

Saturday Night

45 °F

Clear to partly cloudy


Partly sunny

Sunday

83 °F

Very warm with sunshine mixing with some clouds; windy in the afternoon


Partly cloudy

Sunday Night

50 °F

Partly cloudy


Mostly cloudy

Monday

84 °F

Mostly cloudy and very warm


Partly cloudy

Monday Night

52 °F

Partly cloudy


Sunrise and Sunset

Sunrise
5:52 AM
Sunset
8:02 PM

Based on AccuWeather data