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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – April 24, 2018

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

Forecast Discussion:

Figure 1 shows our first thunder-maker moving through at 5:30p Monday. It wasn't a lot of water, but it was nice to hear.

By the time most read this, it will be Tuesday morning, but I'll release this Monday night to give the latest on the snowfall forecast.  We might see a morning coating of snow from this minor system (Figure 2). The front is just south and east of Denver at 6pm Monday (Figure 3).

Midday today (Tuesday), the front will be down into Texas and New Mexico, but some post front precipitation is still possible in the easterly flow behind the front (Figure 4). This is also being aided by a short wave moving over today (the red line to the northwest of Colorado Tuesday AM in the 500mb map-Figure 5). I have to admit, with the split jet stream flow - that is a messy, confusing map!

By this evening (Figure 6), some showers and higher elevation snow chances continue.  They won't be gully-washers. They will be more like wandering showers.

Figure 1: The live radar image from RadarScope Pro app at 5:30pm showing our thunderstorm. White zig zags are lightning strikes.

Figure 2: total snowfall accumulation between Monday PM and Tuesday PM from the GFS and weather5280.com Longmont is the pink dot.

Figure 3: The current surface analysis map from the weather channel.Longmont is the pink dot.

Figure 4: The noon Tuesday forecast surface analysis map from NCEP. Longmont is the pink dot.

Figure 5: the 500mb upper air forecast map for Tuesday AM. Ridges are blue lines, troughs are red lines. Longmont is the pink dot.

Figure 6: The Tuesday PM forecast surface analysis map from NCEP. Longmont is the pink dot.'

The longer range forecast:

Things simplify in the upper atmosphere later this week as a big ridge moves into place.  Warm spring like weather will become the rule. More later!

Figure 7: the 500mb upper air forecast map for Friday AM. Ridges are blue lines, troughs are red lines. Longmont is the pink dot.

Current Weather

Mostly cloudy

Mostly cloudy

70°F

UV Index
5 Moderate
Pressure
30.21 Falling
Visibility
6 miles
Dewpoint
60 °F
Humidity
70%
Wind
NNE 1.8 mph
Gust
3.9 mph
Wind Chill
70 °F

Hourly Forecast

Today
12 PM
72°F
Mostly cloudy
Today
1 PM
76°F
Mostly cloudy
Today
2 PM
78°F
Mostly cloudy
Today
3 PM
80°F
Mostly cloudy
Today
4 PM
82°F
Mostly cloudy
Today
5 PM
84°F
Intermittent clouds
Today
6 PM
82°F
Intermittent clouds
Today
7 PM
79°F
Intermittent clouds
Today
8 PM
77°F
Intermittent clouds
Today
9 PM
73°F
Partly cloudy
Today
10 PM
69°F
Partly cloudy
Today
11 PM
65°F
Intermittent clouds

7 Day Forecast

Mostly cloudy

Saturday

84 °F

Clouds and breaks of sun; high levels of ozone will lead to poor air quality


Partly cloudy

Saturday Night

58 °F

Partly cloudy


Partly sunny w/ showers

Sunday

94 °F

Partly sunny with a passing shower in the afternoon


Partly cloudy

Sunday Night

61 °F

Partly cloudy


Mostly cloudy

Monday

91 °F

Considerable cloudiness


Mostly clear

Monday Night

60 °F

Clear to partly cloudy


Intermittent clouds

Tuesday

92 °F

Sun through high clouds


Partly cloudy

Tuesday Night

58 °F

Partly cloudy


Intermittent clouds

Wednesday

84 °F

Not as warm with times of clouds and sun; a thunderstorm in spots in the afternoon


Intermittent clouds

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Sunrise and Sunset

Sunrise
5:41 AM
Sunset
8:30 PM

Based on AccuWeather data