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Longmont Weather Update

In Brief:

Afternoon thunderstorms (briefly severe now and then) and highs in the 80'sF are the rule for the week.

Update 5/28 8:30a:

As Figure 1 update shows in the gallery, we are under a Marginal Risk (1 on a scale of 1-5) of severe weather later this afternoon. Some storms may produce large hail and damaging winds, but the storms will be very widely scattered fast-moving, and the local NWS office really feels this is barely a Marginal Risk situation. So we may be a 0.75 on a scale of 1-5. A cell or two may reach severe levels for a part of its life cycle.

End 5/28 8:30 a.m. update.

The Forecast Discussion:

We are caught between two stationary fronts on Thursday (Figure 1 in the gallery of images). Moisture will be in place from the Gulf of Mexico and the Pacific.  Daytime heating will use these convergence zones and that energy to kick off daily thunderstorms all week (red boxes in Figure 2 in the gallery). We will see storms pop up in the early afternoon in the foothills to the west. The storms will then drift off across I-25 before dying out on the plains to the east. Brief heavy rain, dangerous lightning, and pea-sized hail are possible right under storm cells.

The Longer-Range Forecast:

Looking at the weekend, it will continue to reach for the upper 80'sF every day before the afternoon storms wander down to cool us off  (red boxes in Figure 2 in the gallery). If you are lucky to get a direct hit by a storm, you might pick up a good amount of rain. On average, though, most folks will see less than a quarter of an inch of rain over the next four days (Figure 3 in the gallery). Be prepared for the heat - Saturday morning will be about 15F above normal (Figure 4 in the gallery) and we'll get even hotter by Monday when a 90+F high temperature is likely. Keep an eye on the western skies every afternoon. Be prepared to shelter from lighting and brief shots of pea-sized hail from a thunderstorm direct hit.

 

The Video Forecast from Longmont Public Media

 


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 cloudy

Mostly cloudy

38°F

UV Index
0 Low
Pressure
29.81 Steady
Visibility
8 miles
Dewpoint
29 °F
Humidity
68%
Wind
N 2.2 mph
Gust
4.4 mph
Wind Chill
38 °F

Hourly Forecast

Today
6 AM
38°F
Showers
Today
7 AM
37°F
Mostly cloudy
Today
8 AM
38°F
Intermittent clouds
Today
9 AM
41°F
Intermittent clouds
Today
10 AM
44°F
Intermittent clouds
Today
11 AM
47°F
Intermittent clouds
Today
12 PM
49°F
Intermittent clouds
Today
1 PM
51°F
Intermittent clouds
Today
2 PM
52°F
Intermittent clouds
Today
3 PM
52°F
Intermittent clouds
Today
4 PM
51°F
Intermittent clouds
Today
5 PM
50°F
Intermittent clouds

7 Day Forecast

Partly sunny w/ showers

Friday

52 °F

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


Showers

Friday Night

34 °F

A couple of showers this evening; otherwise, cloudy


Mostly cloudy

Saturday

60 °F

Mostly cloudy


Intermittent clouds

Saturday Night

34 °F

Partly cloudy


Intermittent clouds

Sunday

62 °F

Periods of clouds and sun


Mostly cloudy

Sunday Night

33 °F

Becoming cloudy


Showers

Monday

52 °F

Cloudy and cooler with occasional rain; windy in the afternoon


Intermittent clouds

Monday Night

29 °F

Windy in the evening; partly cloudy


Mostly sunny

Tuesday

61 °F

Mostly sunny and milder


Clear

Tuesday Night

29 °F

Clear


Sunrise and Sunset

Sunrise
6:48 AM
Sunset
7:23 PM

Based on AccuWeather data