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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!

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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

34°F

UV Index
0 Low
Pressure
30.24 Steady
Visibility
3 miles
Dewpoint
31 °F
Humidity
90%
Wind
E 1.1 mph
Gust
2.7 mph
Wind Chill
34 °F

Hourly Forecast

Today
3 AM
34°F
Cloudy
Today
4 AM
34°F
Mostly cloudy
Today
5 AM
34°F
Mostly cloudy
Today
6 AM
34°F
Cloudy
Today
7 AM
35°F
Cloudy
Today
8 AM
34°F
Intermittent clouds
Today
9 AM
35°F
Intermittent clouds
Today
10 AM
36°F
Intermittent clouds
Today
11 AM
38°F
Intermittent clouds
Today
12 PM
40°F
Intermittent clouds
Today
1 PM
41°F
Intermittent clouds
Today
2 PM
42°F
Cloudy

7 Day Forecast

Rain and snow

Thursday

37 °F

Cloudy and much colder; snow showers in the morning, accumulating a coating to an inch followed by brief showers in the afternoon


Showers

Thursday Night

34 °F

Mostly cloudy with a couple of brief showers beginning late evening


Mostly cloudy w/ showers

Friday

43 °F

Chilly with some sun, then turning cloudy; a little rain this afternoon


Rain and snow

Friday Night

32 °F

Periods of snow; rain mixed in early, accumulating an inch or two


Flurries

Saturday

40 °F

A bit of morning snow with little or no accumulation; otherwise, cloudy and chilly; storm total snowfall an inch or two


Intermittent clouds

Saturday Night

31 °F

Partly cloudy


Partly sunny

Sunday

64 °F

Partly sunny, pleasant and warmer


Partly cloudy

Sunday Night

41 °F

Partly cloudy


Intermittent clouds

Monday

79 °F

Warmer with a blend of sun and clouds


Intermittent clouds

Monday Night

36 °F

Increasing clouds


Sunrise and Sunset

Sunrise
6:17 AM
Sunset
7:43 PM

Based on AccuWeather data