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Wed Update:The Front Range Forecast: Smoke now, storms later

In Brief:

Smoke for a bit longer, clearer air and afternoon thunderstorms begin.

Wednesday Update:

Change is coming to the weather today! There is about a 40% chance of a thunderstorm this afternoon. There is also a chance that the storms today may reach severe levels with hail and high winds being the primary threat (Figure 1 update).  The air coming in behind these storms should be more from the southwest and noticeably improve our air quality, cleaning out the smoke from the ongoing Canadian fires.

We have a lower chance of thunderstorms on Thursday, and a better chance, again, on Friday.  The storms on these days may reach severe levels as well, with hail and high winds still the primary threat. But you'll be able to breath easier!

figure1u_05242023
Figure 1 update: the Day 1 SPC severe weather forecast for Wednesday.

End Wednesday update.

The Forecast Discussion:

After a few Saturday afternoon showers, the weather turns calm for a couple of days (Figure 1). The real problem is smoke.  Giant forest fires in Canada (and Mexico) are pumping the westerlies full of smoke (Figure 2). By Sunday, another surge of very bad air is headed our way (Figure 3).  Eventually, westerly then southwesterly winds will clean the air by mid- week and later in the week.

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Figure 1: the 10 day graphical forecast for Denver from weatherunderground.com
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Figure 2: the RAP smoke forecast for Wednesday PM from NOAA.
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Figure 3: the RAP smoke forecast for Thursday PM from NOAA.

The Longer Range forecast:

With increased tropical moisture and southerly winds, the smoke will clear and rain chances will increase in the afternoons starting Tuesday (Figure 4). Wandering storms will give the I-25 folks a tenth to a quarter of an inch of rain over the next 5 days - more rain for the mountains (Figure 5).

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Figure 4: the surface precipitation forecast map for Tuesday PM from tropicaltidbits and the GFS model
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Figure 5: the 5 day precipitation forecast from the GFS and 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

Mostly cloudy

Mostly cloudy

43°F

UV Index
0 Low
Pressure
29.88 Rising
Visibility
8 miles
Dewpoint
30 °F
Humidity
61%
Wind
W 3.3 mph
Gust
7.7 mph
Wind Chill
42 °F

Hourly Forecast

Today
11 PM
41°F
Showers
Tomorrow
12 AM
39°F
Cloudy
Tomorrow
1 AM
38°F
Partly cloudy
Tomorrow
2 AM
36°F
Partly cloudy
Tomorrow
3 AM
35°F
Partly cloudy
Tomorrow
4 AM
34°F
Partly cloudy
Tomorrow
5 AM
32°F
Mostly clear
Tomorrow
6 AM
31°F
Mostly clear
Tomorrow
7 AM
33°F
Sunny
Tomorrow
8 AM
35°F
Mostly sunny
Tomorrow
9 AM
38°F
Mostly sunny
Tomorrow
10 AM
43°F
Sunny

7 Day Forecast

Partly sunny w/ showers

Tuesday

61 °F

Breezy this morning; otherwise, sunshine mixing with some clouds with a shower in spots late this afternoon


Partly cloudy w/ showers

Tuesday Night

31 °F

A couple of brief showers late this evening; becoming clear


Mostly sunny

Wednesday

52 °F

Mostly sunny


Mostly clear

Wednesday Night

29 °F

Mainly clear


Mostly sunny

Thursday

60 °F

Partly to mostly sunny and pleasant


Mostly clear

Thursday Night

28 °F

Clear to partly cloudy


Intermittent clouds

Friday

55 °F

Intervals of clouds and sunshine


Mostly clear

Friday Night

29 °F

Clear to partly cloudy; not as cold late


Mostly sunny

Saturday

57 °F

Mostly sunny


Partly cloudy

Saturday Night

26 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:43 AM
Sunset
4:46 PM

Based on AccuWeather data