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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – August 25-26, 2019

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

In Brief:

We ride a roller coaster temperature-wise this week. We stay dry through Thursday morning with (in these runs) at least three cold fronts of note. We are cool Tuesday (and not so much at the end of the week, as it appeared a few days ago. We have real heat before the cool-down on Sunday - pushing close to 100F.

Forecast Discussion:

Moisture is now far from the state (Figure 1) and a transient ridge will bake us on Sunday. Temperatures will be up to 12-15F above normal around Longmont (Figure 3).

Relief is visible up in the Pacific northwest with an approaching cold front (Figure 2). We are dry and hot today, then we cool down but stay mostly dry into Tuesday.

The Longer Range Forecast:

Models differ and model runs differ every few hours, but this snapshot of the long range forecast has a cold front Sunday and Monday afternoons and another on Thursday. The BIG cool down at the end of the week is not visible on the weatherunderground model run - but is still not impossible (Figure 4).

Figure 1: the water vapor satellite image (browns/reds are dry air, whites and light grey is moist air, purple/blue is ice and high cloud tops). From the the Weather Channel from Saturday midday.
Figure 2: The forecast surface map for Saurday midday from NCEP.
Figure 3: the surface temperature anomaly (departure from normal) from the GFS for Sunday PM.
Figure 4: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com

Current Weather

Cloudy

Cloudy

52°F

UV Index
2 Low
Pressure
29.82 Falling
Visibility
7 miles
Dewpoint
38 °F
Humidity
57%
Wind
NNE 1 mph
Gust
3.3 mph
Wind Chill
52 °F

Hourly Forecast

Today
11 AM
61°F
Mostly cloudy
Today
12 PM
65°F
Cloudy
Today
1 PM
69°F
Cloudy
Today
2 PM
72°F
Cloudy
Today
3 PM
75°F
Cloudy
Today
4 PM
78°F
Cloudy
Today
5 PM
77°F
Cloudy
Today
6 PM
75°F
Cloudy
Today
7 PM
73°F
Cloudy
Today
8 PM
69°F
Cloudy
Today
9 PM
66°F
Cloudy
Today
10 PM
63°F
Mostly cloudy

7 Day Forecast

Mostly cloudy

Sunday

78 °F

Rather cloudy and warmer; breezy this afternoon


Mostly cloudy

Sunday Night

47 °F

Mostly cloudy and windy


Windy

Monday

56 °F

Winds gusting past 40 mph; cloudy


Intermittent clouds

Monday Night

43 °F

Partly cloudy


Partly sunny w/ showers

Tuesday

59 °F

A couple of showers in the morning; otherwise, windy and cool with times of clouds and sun


Partly cloudy

Tuesday Night

32 °F

Partly cloudy


Intermittent clouds

Wednesday

58 °F

Times of clouds and sun


Intermittent clouds

Wednesday Night

38 °F

Partly cloudy


Intermittent clouds

Thursday

56 °F

Breezy and cool with sun and clouds


Intermittent clouds

Thursday Night

37 °F

Partly cloudy


Sunrise and Sunset

Sunrise
5:54 AM
Sunset
8:00 PM

Based on AccuWeather data