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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – June 6, 2019

This content was originally published by the Longmont Observer and is licensed under a Creative Commons license.

In Brief:

If it wasn't for the cold fronts coming this weekend, this would be a very boring discussion. In advance of that, we'll see above average temperatures and a small chance of an afternoon thunderstorm. The main front arrives mid-afternoon Saturday with a better chance of showers/thunderstorms.

Sunday is cool with slowly clearing clouds. We remain just below 80F for much of next week with some afternoon rain chances.

Forecast Discussion:

Today (Thursday) will see very low chances of afternoon storms (more in the southern mountains again - Figure 1). We end the week with above average high temperatures (mid 80'sF). The first surge of cool air comes in Friday afternoon (blue line - Figure 2) with a slightly better chance of showers. We are cooled 10F on Saturday.

The Longer Range Forecast:

The next front comes in Saturday afternoon (with the big peak in rain chances - not marked by an added graphic- Figure 2) and we cool another 10F going into Sunday.

This double shot of cool air is coming in thanks to a big trough north of the state (Figure 3). Rain amounts over the next 5 days (the green line in Figure 2 - and painted out in Figure 4) show Longmont getting minimal rain totals, but lucky folks in the mountains and out on the eastern plains will break 1 inch of water.

There isn't any severe weather on the near horizon either. Any storm can be dangerous with local flooding, lightning, and a blast of strong winds. Respect the storms, especially if you are up in the mountains!

Figure 1: The forecast surface map for Thursday night from NCEP.
Figure 2: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 3: The 500mb forecast upper air analysis for Sunday AM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.
Figure 4: the forecast accumulated precipitation map from the GFS and weather5280.com for Colorado,over the next 5 days.

Current Weather

Cloudy

Cloudy

48°F

UV Index
0 Low
Pressure
29.77 Steady
Visibility
8 miles
Dewpoint
27 °F
Humidity
44%
Wind
SE 2.8 mph
Gust
6 mph
Wind Chill
47 °F

Hourly Forecast

Today
1 AM
45°F
Cloudy
Today
2 AM
43°F
Intermittent clouds
Today
3 AM
40°F
Intermittent clouds
Today
4 AM
38°F
Intermittent clouds
Today
5 AM
36°F
Intermittent clouds
Today
6 AM
34°F
Intermittent clouds
Today
7 AM
36°F
Intermittent clouds
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
50°F
Intermittent clouds

7 Day Forecast

Partly sunny

Thursday

65 °F

Partly sunny


Intermittent clouds

Thursday Night

34 °F

A shower in spots late this evening; otherwise, partly cloudy


Partly sunny w/ showers

Friday

53 °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

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


Sunrise and Sunset

Sunrise
6:50 AM
Sunset
7:22 PM

Based on AccuWeather data