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Longmont Weather Forecast 7/30-31/2020

In Brief:

Slightly better storm chances are slated for Thursday before a big western ridge returns us to only small afternoon storm chances.

Forecast Discussion:

One more short wave passes Thursday giving us better storm chances (Figure 1 in the gallery above). The ridge to the west with a high center over NW Arizona is about to grow! The moisture for Thursday is having to travel pretty far from the Gulf to get to us, but it will for one more day (Figure 2). This northwest flow is bringing a bit of haze and smoke in with the moisture (Figure 3) but it isn't very thick this time.  Note, severe weather is not expected around Longmont at this time. A nice feature to this pattern is that there is a strong northern component to the air flow into the state, so we won't see abnormally warm temperatures until maybe next week (Figure 4).

Rainfall over the next 48 hours should be quite minimal and confined to the I-25 corridor overall (Figure 5).

The Longer Range Forecast:

In the long term, blobs of moisture will interact with short waves in the northwest flow to give us slightly better storm chances Friday, Sunday and Tuesday afternoons (Figure 4). The eastern plains *might* get a lucky 1/2 inch or more in spots (Figure 6).  The longer term forecast is really all about the giant western U.S. ridge that will form and stay in place (Figure 7).  Again, that northern flow will keep us from seeing record high tempreatures (whew!).

In Figure 7 you can see the GFS's take on Isaias around Saturday noon.  The National Hurricane Center still expectes it to stay below hurricane status (due to the hostile enviroment it is moving through; dry air, wind shear)- but impacts might be felt across Floriday and up the east coast into next week (Figure 8).

This Week's Video Forecast!


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 clear

Mostly clear

32°F

UV Index
0 Low
Pressure
29.99 Steady
Visibility
8 miles
Dewpoint
24 °F
Humidity
71%
Wind
WNW 2.2 mph
Gust
4.3 mph
Wind Chill
32 °F

Hourly Forecast

Today
4 AM
30°F
Intermittent clouds
Today
5 AM
28°F
Intermittent clouds
Today
6 AM
26°F
Mostly cloudy
Today
7 AM
29°F
Mostly cloudy
Today
8 AM
36°F
Partly sunny
Today
9 AM
42°F
Partly sunny
Today
10 AM
48°F
Partly sunny
Today
11 AM
53°F
Partly sunny
Today
12 PM
57°F
Partly sunny
Today
1 PM
60°F
Partly sunny
Today
2 PM
62°F
Partly sunny
Today
3 PM
63°F
Partly sunny

7 Day Forecast

Mostly sunny

Wednesday

54 °F

Sunny to partly cloudy and warmer


Mostly cloudy

Wednesday Night

26 °F

Increasing cloudiness


Partly sunny

Thursday

64 °F

Partly sunny


Intermittent clouds

Thursday Night

35 °F

Partly cloudy


Partly sunny w/ showers

Friday

54 °F

Cooler with times of clouds and sun; a couple of showers late in the afternoon


Showers

Friday Night

33 °F

A couple of showers in the evening; otherwise, cloudy


Mostly cloudy

Saturday

60 °F

Mostly cloudy


Intermittent clouds

Saturday Night

36 °F

Partly cloudy


Intermittent clouds

Sunday

62 °F

Times of sun and clouds


Mostly cloudy

Sunday Night

36 °F

Becoming cloudy with a shower in spots late


Sunrise and Sunset

Sunrise
6:51 AM
Sunset
7:21 PM

Based on AccuWeather data