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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 sunny

Mostly sunny

91°F

UV Index
11 Extreme
Pressure
30.17 Steady
Visibility
8 miles
Dewpoint
46 °F
Humidity
20%
Wind
ESE 3.5 mph
Gust
9.7 mph
Wind Chill
91 °F

Hourly Forecast

Today
1 PM
92°F
Partly sunny
Today
2 PM
91°F
Partly sunny w/ t-storms
Today
3 PM
89°F
Partly sunny
Today
4 PM
88°F
Partly sunny
Today
5 PM
87°F
Partly sunny
Today
6 PM
84°F
Partly sunny
Today
7 PM
83°F
Partly sunny
Today
8 PM
79°F
Mostly sunny
Today
9 PM
74°F
Mostly clear
Today
10 PM
70°F
Mostly clear
Today
11 PM
65°F
Mostly clear
Tomorrow
12 AM
63°F
Clear

7 Day Forecast

Partly sunny w/ t-storms

Saturday

92 °F

Sunny to partly cloudy with a thunderstorm in spots this afternoon; thunderstorms can bring hail and damaging winds


Clear

Saturday Night

58 °F

Clear


Partly sunny w/ t-storms

Sunday

91 °F

More sun than clouds with a stray thunderstorm


Mostly clear

Sunday Night

58 °F

Mainly clear


Partly sunny

Monday

90 °F

Partly sunny


Clear

Monday Night

57 °F

Clear


Partly sunny

Tuesday

95 °F

Partly sunny


Clear

Tuesday Night

58 °F

Clear


Mostly sunny

Wednesday

100 °F

Very warm with the temperature tying the record from 2022 with sunshine and a few clouds


Clear

Wednesday Night

61 °F

Clear


Sunrise and Sunset

Sunrise
5:37 AM
Sunset
8:33 PM

Based on AccuWeather data