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Update 7/14 4pm: Longmont Weather Forecast 7/13-14/2020

In Brief:

While a ridge continues to dominate the nation (and Colorado) bringing the heat, some moisture is sneaking into Colorado bringing back an afternoon chance of thunderstorms.

Update 7/14 4pm:

Just a quick update (without a new graphic)... the air flow around the western side of the big southern U.S. ridge is from the southwest and west across northern Colorado.  This is bringing in smoke from a few new Western fires, including one on the Western Slopes of Colroado.  The NWS has issued an air quality alert because of this.  You might notice some haze (made more noticable by increased atmospheric moisture).

End 7/14 4pm update.

Forecast Discussion:

Figure 1 in the gallery shows that some moisture is making it around the west side of the ridge aloft (light green arrow) and at the surface (dark green arrow).  We have plenty of heat, and now energy (latent heat - energy needed to keep water in a vapor state) for a welcome return of thunderstorms (hopefully without lightning induced fires). The forecast pattern for Tuesday is very similar with moisture still pooling abnormally high over the state but especially east of the Rockies (Figure 2). We have a chance of severe weather back to I-25 again Tuesday - for hail and high winds (Figure 3).  Tornado threats will remain way out in the northeast corner of the state where moisture is deeper and the winds are more favorable.

The Longer Range Forecast:

The daily afternoon thunderstorm pules are going to remain in the forecast for the next week (Figure 4). The trough we covered last time will indeed cool us to the 80'sF for a couple of days, but the near 100'sF temperatures are back at the end of the week.  The 5 day rainfall total map shows some folks getting VERY high 1-3 inch rainfall totals (not necessarily exactly the pattern you see in Figure 5).  We seem to get about 1/4 to 1/2 inch of rain around here over that time.

 


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 sunny

Mostly sunny

93°F

UV Index
1 Low
Pressure
29.86 Falling
Visibility
8 miles
Dewpoint
40 °F
Humidity
16%
Wind
ESE 4.5 mph
Gust
9 mph
Wind Chill
93 °F

Hourly Forecast

Today
7 PM
90°F
Intermittent clouds
Today
8 PM
86°F
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Today
9 PM
82°F
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Today
10 PM
79°F
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Today
11 PM
75°F
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Tomorrow
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72°F
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1 AM
69°F
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2 AM
68°F
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3 AM
67°F
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Tomorrow
4 AM
66°F
Intermittent clouds
Tomorrow
5 AM
65°F
Intermittent clouds
Tomorrow
6 AM
64°F
Intermittent clouds

7 Day Forecast

Partly sunny

Thursday

95 °F

Very warm with sunshine mixing with some clouds


Intermittent clouds

Thursday Night

64 °F

Partly cloudy


Partly sunny w/ t-storms

Friday

89 °F

Partly sunny with a thundershower in spots in the afternoon


Clear

Friday Night

61 °F

Clear


Partly sunny

Saturday

93 °F

Partly sunny


Clear

Saturday Night

56 °F

Clear


Partly sunny

Sunday

89 °F

Partly sunny with a stray thunderstorm


Clear

Sunday Night

57 °F

Clear


Partly sunny

Monday

93 °F

Partly sunny


Clear

Monday Night

57 °F

Clear


Sunrise and Sunset

Sunrise
5:36 AM
Sunset
8:33 PM

Based on AccuWeather data