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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – August 7th, 2018

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

Forecast Discussion:

Storms dropped big hail in a few locations on the eastern plains, but not near Longmont on Monday. It was interesting that the pattern seen on the GFS forecast yesterday DID match what happened fairly closely. Maybe it triggered on orograph (land caused) storm formation. Interesting.

We have less moisture around today and will have a bit less tomorrow (Figure 1). That figure shows some more dry air on the eastern plains (with purple and blue afternoon thunderstorms). The smoke from the west is still present, but lighter than it has been much of the last week (Figure 2).

The frontal push of the last few days washes out to our south. Heating and an upper level trough will kick off a bit of a storm or two along the Front Range in the afternoon again (Figure 3).

Storms are isolated with many locations seeing only a sprinkle or little rain (Figure 4).

There will be a chance of severe storms today, but mainly in South Denver and south into New Mexico - Figure 5.

Figure 1: the water vapor satellite image from Monday night. Reds/Oranges are dry air, greys/whites are moist air regions.

Figure 2: The HRRR (high resolution rapid refresh) model forecast of smoke at all levels for Tuesday midday.

Figure 3: The forecast surface map for Tuesday midday. From NCEP.

Figure 4: The total accumulated precipitation between Monday PM and Tuesday late PM from the GFS and weather5280.com

Figure 5: the day 2 SPC thunderstorm and severe weather forecast made Monday (valid Tuesday).

The longer range forecast:

We dry out and warm to right around 88°F to 90°F each day. Pretty quiet after that.

Current Weather

Cloudy

Cloudy

72°F

UV Index
2 Low
Pressure
29.71 Falling
Visibility
9 miles
Dewpoint
41 °F
Humidity
31%
Wind
NNE 3.5 mph
Gust
9.2 mph
Wind Chill
73 °F

Hourly Forecast

Today
3 PM
73°F
Intermittent clouds
Today
4 PM
72°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
Today
11 PM
55°F
Cloudy
Tomorrow
12 AM
54°F
Cloudy
Tomorrow
1 AM
53°F
Cloudy
Tomorrow
2 AM
52°F
Cloudy

7 Day Forecast

Mostly cloudy w/ showers

Thursday

73 °F

Turning cloudy, warm; an afternoon shower


Thunderstorms

Thursday Night

47 °F

A thunderstorm in spots this evening; otherwise, considerable cloudiness


Thunderstorms

Friday

70 °F

Mostly cloudy 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