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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

43°F

UV Index
0 Low
Pressure
30.18 Steady
Visibility
2 miles
Dewpoint
41 °F
Humidity
92%
Wind
NE 3.2 mph
Gust
6.5 mph
Wind Chill
42 °F

Hourly Forecast

Today
6 PM
45°F
Showers
Today
7 PM
46°F
Showers
Today
8 PM
46°F
Rain
Today
9 PM
46°F
Cloudy
Today
10 PM
46°F
Rain
Today
11 PM
46°F
Rain
Tomorrow
12 AM
46°F
Rain
Tomorrow
1 AM
46°F
Rain
Tomorrow
2 AM
45°F
Intermittent clouds
Tomorrow
3 AM
45°F
Intermittent clouds
Tomorrow
4 AM
44°F
Intermittent clouds
Tomorrow
5 AM
44°F
Intermittent clouds

7 Day Forecast

Showers

Friday

46 °F

A thick cloud cover and chilly with a few showers


Mostly cloudy w/ showers

Friday Night

43 °F

Rain and drizzle this evening; otherwise, low clouds breaking


Mostly cloudy

Saturday

74 °F

Warmer with variable cloudiness


Clear

Saturday Night

41 °F

Clear


Partly sunny

Sunday

80 °F

Very warm with sunshine mixing with some clouds; breezy in the afternoon; elevated fire risk due to gusty winds and low humidity


Partly cloudy

Sunday Night

46 °F

Partly cloudy


Mostly cloudy

Monday

64 °F

Turning cloudy, windy and cooler; a shower in spots in the afternoon


Mostly cloudy

Monday Night

39 °F

Cloudy in the evening, then partly cloudy late


Intermittent clouds

Tuesday

66 °F

Sun and clouds


Mostly clear

Tuesday Night

39 °F

Mainly clear


Sunrise and Sunset

Sunrise
6:08 AM
Sunset
7:49 PM

Based on AccuWeather data