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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

Cloudy

Cloudy

47°F

UV Index
0 Low
Pressure
30.02 Rising
Visibility
8 miles
Dewpoint
44 °F
Humidity
89%
Wind
NE 2.6 mph
Gust
6.5 mph
Wind Chill
46 °F

Hourly Forecast

Today
10 PM
47°F
Rain
Today
11 PM
46°F
Rain
Tomorrow
12 AM
46°F
Rain
Tomorrow
1 AM
46°F
Cloudy
Tomorrow
2 AM
46°F
Rain
Tomorrow
3 AM
46°F
Rain
Tomorrow
4 AM
46°F
Rain
Tomorrow
5 AM
46°F
Rain
Tomorrow
6 AM
46°F
Cloudy
Tomorrow
7 AM
47°F
Cloudy
Tomorrow
8 AM
47°F
Mostly cloudy
Tomorrow
9 AM
49°F
Mostly cloudy

7 Day Forecast

Mostly cloudy w/ t-storms

Wednesday

71 °F

Turning cloudy; a thundershower in parts of the area this morning followed by thundershowers this afternoon


Rain

Wednesday Night

46 °F

Rain and drizzle


Partly sunny w/ showers

Thursday

59 °F

A touch of rain in the morning; otherwise, cooler with increasing amounts of sun


Partly cloudy w/ showers

Thursday Night

40 °F

A couple of showers in the evening; otherwise, partly cloudy


Mostly cloudy

Friday

68 °F

Mostly cloudy


Clear

Friday Night

38 °F

Clear


Mostly sunny

Saturday

77 °F

Mostly sunny, pleasant and warmer


Mostly clear

Saturday Night

41 °F

Mainly clear


Mostly cloudy

Sunday

74 °F

Sun followed by clouds; breezy in the afternoon


Intermittent clouds

Sunday Night

49 °F

Windy in the evening; becoming partly cloudy


Sunrise and Sunset

Sunrise
6:02 AM
Sunset
7:54 PM

Based on AccuWeather data