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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

62°F

UV Index
0 Low
Pressure
30.01 Steady
Visibility
8 miles
Dewpoint
56 °F
Humidity
81%
Wind
NNE 5.6 mph
Gust
12.9 mph
Wind Chill
62 °F

Hourly Forecast

Today
6 AM
62°F
Cloudy
Today
7 AM
62°F
Partly sunny w/ showers
Today
8 AM
63°F
Cloudy
Today
9 AM
65°F
Cloudy
Today
10 AM
68°F
Cloudy
Today
11 AM
70°F
Cloudy
Today
12 PM
73°F
Cloudy
Today
1 PM
72°F
Cloudy
Today
2 PM
72°F
Intermittent clouds
Today
3 PM
71°F
Mostly cloudy w/ t-storms
Today
4 PM
69°F
Intermittent clouds
Today
5 PM
70°F
Intermittent clouds

7 Day Forecast

Mostly cloudy w/ t-storms

Tuesday

73 °F

Cooler with variable cloudiness; a strong afternoon thunderstorm in spots; thunderstorms can bring hail and damaging winds


Clear

Tuesday Night

53 °F

Clear


Mostly sunny

Wednesday

86 °F

Mostly sunny, pleasant and warmer; a big warmup is on the way later this week


Clear

Wednesday Night

55 °F

Clear


Mostly sunny

Thursday

98 °F

Sunny to partly cloudy and hot with the temperature approaching the record of 100 set in 2016; caution advised if outside for extended periods of time


Clear

Thursday Night

58 °F

Clear


Hot

Friday

102 °F

Sunny to partly cloudy and very hot with the temperature breaking the record of 101 set in 1989; first day of intense heat


Clear

Friday Night

60 °F

Clear


Hot

Saturday

104 °F

Blazing sunshine and very hot with the temperature breaking the record of 103 set in 2016; check on groups more sensitive to extreme heat


Mostly clear

Saturday Night

62 °F

Mainly clear and mild


Sunrise and Sunset

Sunrise
5:30 AM
Sunset
8:32 PM

Based on AccuWeather data