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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

Sunny

Sunny

63°F

UV Index
6 High
Pressure
29.82 Falling
Visibility
7 miles
Dewpoint
47 °F
Humidity
58%
Wind
NE 1.7 mph
Gust
4.3 mph
Wind Chill
63 °F

Hourly Forecast

Today
11 AM
68°F
Partly sunny
Today
12 PM
73°F
Intermittent clouds
Today
1 PM
77°F
Intermittent clouds
Today
2 PM
76°F
Cloudy
Today
3 PM
75°F
Cloudy
Today
4 PM
73°F
Cloudy
Today
5 PM
70°F
Cloudy
Today
6 PM
68°F
Cloudy
Today
7 PM
65°F
Cloudy
Today
8 PM
62°F
Thunderstorms
Today
9 PM
59°F
Cloudy
Today
10 PM
56°F
Cloudy

7 Day Forecast

Mostly cloudy

Thursday

77 °F

Turning cloudy; warm


Thunderstorms

Thursday Night

47 °F

A thunderstorm in spots this evening; otherwise, considerable cloudiness


Thunderstorms

Friday

70 °F

Mostly cloudy and not as warm with a couple of thundershowers


Thunderstorms

Friday Night

43 °F

Cloudy with a couple of thundershowers


Rain

Saturday

46 °F

Chilly with periods of rain and a thunderstorm


Rain and snow

Saturday Night

39 °F

Cloudy with rain, mixed with a little snow late


Mostly cloudy

Sunday

59 °F

Mostly cloudy and warmer; a stray afternoon thundershower


Partly cloudy

Sunday Night

36 °F

Partly cloudy


Partly sunny

Monday

71 °F

Partly sunny and warmer


Partly cloudy

Monday Night

39 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:07 AM
Sunset
7:50 PM

Based on AccuWeather data