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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

Cloudy

Cloudy

25°F

UV Index
0 Low
Pressure
29.89 Rising
Visibility
4 miles
Dewpoint
23 °F
Humidity
94%
Wind
NE 2.7 mph
Gust
4.8 mph
Wind Chill
21 °F

Hourly Forecast

Today
6 PM
26°F
Cloudy
Today
7 PM
27°F
Cloudy
Today
8 PM
26°F
Cloudy
Today
9 PM
26°F
Flurries
Today
10 PM
25°F
Flurries
Today
11 PM
24°F
Flurries
Tomorrow
12 AM
23°F
Flurries
Tomorrow
1 AM
22°F
Cloudy
Tomorrow
2 AM
21°F
Cloudy
Tomorrow
3 AM
20°F
Flurries
Tomorrow
4 AM
20°F
Flurries
Tomorrow
5 AM
19°F
Flurries

7 Day Forecast

Freezing rain

Saturday

27 °F

Mainly cloudy and colder; watch for slippery spots early


Snow

Saturday Night

17 °F

A little snow at times with little or no accumulation


Mostly cloudy w/ flurries

Sunday

31 °F

A little accumulation of snow early in the morning; otherwise, clouds giving way to some sun and cold


Mostly clear

Sunday Night

16 °F

Clear to partly cloudy


Partly sunny

Monday

39 °F

Partly sunny and not as cold


Mostly cloudy w/ flurries

Monday Night

22 °F

Increasing clouds with a bit of snow late with little or no accumulation


Snow

Tuesday

26 °F

Cloudy with occasional snow and flurries, mainly early; colder


Partly cloudy

Tuesday Night

3 °F

Partly cloudy and colder


Sunny

Wednesday

36 °F

Not as cold with plenty of sunshine


Mostly clear

Wednesday Night

14 °F

Mainly clear


Sunrise and Sunset

Sunrise
7:23 AM
Sunset
4:48 PM

Based on AccuWeather data