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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – March 20, 2018

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

Forecast Discussion:

This is the best hit of water we've had in months and months.  Let's look at the Front Range rundown...

Figure 1 is rainfall for Boulder County.  Longmont received 1/2 to 3/4ths of an inch of water (I predicted 1/4th to 1/2 an inch - so this storm over-performed on me. Good!). Boulder was similar in its water amounts.

Figure 2 is snowfall for Boulder County - we (Longmont) received 1/2 to 1 inch of snow, on average.  Boulder did about the same as well.

In Figure 3 and 4, Denver saw a lot of 1/2 to 1 inch rainfall amounts and 1-8 inches of snow (heavy amounts on the south and southwest edges).

Figures 5 and 6 show 1/4th to 3/4th's of an inch of water north of Longmont but very little snow, a trace to an inch along I-25.

Additional snow showers moved over all afternoon and evening on Monday. Now we warm to normal and above normal temperatures again.

Figure 1: Boulder County rainfall reports as of 7am Monday 3/19 from CoCoRaHS.

Figure 2: Boulder County snowfall reports as of 7am Monday 3/19 from CoCoRaHS.

Figure 3: Denver Metro rainfall reports as of 7am Monday 3/19 from CoCoRaHS.

Figure 4: Denver Metro snowfall reports as of 7am Monday 3/19 from CoCoRaHS.

Figure 5: Larimer County rainfall reports as of 7am Monday 3/19 from CoCoRaHS.

Figure 6: Larimer County snowfall reports as of 7am Monday 3/19 from CoCoRaHS.

The longer range forecast:

A ridge slowly inches overhead Tuesday through Friday.  As a representative image of this ridge, take a look at the blue line in the 500mb upper air forecast map (Figure 7) for Thursday AM.

Our next (also possibly nice and wet) storm begins mid-weekend. The trough moving in (the red line in Figure 8) is our next storm.

Figure 7: The 500mb forecast upper air map for Thursday morning from the GFS.

Figure 8: The 500mb forecast upper air map for Sunday morning from the GFS.

Current Weather

Rain

Rain

44°F

UV Index
0 Low
Pressure
29.79 Steady
Visibility
7 miles
Dewpoint
40 °F
Humidity
89%
Wind
NW 3.5 mph
Gust
7.5 mph
Wind Chill
42 °F

Hourly Forecast

Tomorrow
12 AM
45°F
Thunderstorms
Tomorrow
1 AM
45°F
Cloudy
Tomorrow
2 AM
44°F
Cloudy
Tomorrow
3 AM
44°F
Rain
Tomorrow
4 AM
44°F
Cloudy
Tomorrow
5 AM
44°F
Rain
Tomorrow
6 AM
44°F
Rain
Tomorrow
7 AM
44°F
Rain
Tomorrow
8 AM
43°F
Cloudy
Tomorrow
9 AM
42°F
Rain
Tomorrow
10 AM
41°F
Rain
Tomorrow
11 AM
41°F
Rain

7 Day Forecast

Mostly cloudy w/ t-storms

Friday

69 °F

Variable cloudiness with a couple of thundershowers this afternoon; gusty winds and small hail can accompany any downpour


Thunderstorms

Friday Night

41 °F

Cloudy; showers and thunderstorms this evening followed by periods of rain late; gusty winds and small hail can accompany any downpour


Rain

Saturday

44 °F

Chilly with periods of rain and a thunderstorm; travel in the foothills and mountains will be slippery due to snow


Rain and snow

Saturday Night

36 °F

Cloudy with rain, mixed with a little snow late; travel in the foothills and mountains will be slippery due to snow


Mostly cloudy

Sunday

61 °F

Mostly cloudy and warmer


Intermittent clouds

Sunday Night

36 °F

A thunderstorm in spots in the evening; otherwise, partly cloudy


Partly sunny

Monday

71 °F

Partly sunny, pleasant and warmer


Partly cloudy

Monday Night

45 °F

Partly cloudy


Mostly sunny

Tuesday

73 °F

Pleasant with sunshine and patchy clouds


Partly cloudy

Tuesday Night

40 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:06 AM
Sunset
7:51 PM

Based on AccuWeather data