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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

Drizzle

Drizzle

42°F

UV Index
0 Low
Pressure
30.17 Steady
Visibility
3 miles
Dewpoint
40 °F
Humidity
95%
Wind
NNE 2.6 mph
Gust
4.8 mph
Wind Chill
41 °F

Hourly Forecast

Today
11 PM
42°F
Rain
Tomorrow
12 AM
43°F
Rain
Tomorrow
1 AM
43°F
Rain
Tomorrow
2 AM
43°F
Intermittent clouds
Tomorrow
3 AM
43°F
Intermittent clouds
Tomorrow
4 AM
43°F
Intermittent clouds
Tomorrow
5 AM
43°F
Intermittent clouds
Tomorrow
6 AM
43°F
Intermittent clouds
Tomorrow
7 AM
45°F
Intermittent clouds
Tomorrow
8 AM
48°F
Fog
Tomorrow
9 AM
51°F
Fog
Tomorrow
10 AM
56°F
Fog

7 Day Forecast

Showers

Friday

46 °F

A thick cloud cover and chilly with a few showers


Mostly cloudy w/ showers

Friday Night

41 °F

Rain and drizzle this evening; otherwise, low clouds breaking


Mostly cloudy

Saturday

74 °F

Areas of fog in the morning; otherwise, warmer with variable cloudiness


Clear

Saturday Night

41 °F

Clear


Partly sunny

Sunday

80 °F

Very warm with sunshine mixing with some clouds; breezy in the afternoon; elevated fire risk due to gusty winds and low humidity


Partly cloudy

Sunday Night

46 °F

Partly cloudy


Mostly cloudy

Monday

64 °F

Turning cloudy, windy and cooler; a shower in spots in the afternoon


Mostly cloudy

Monday Night

39 °F

Cloudy in the evening, then partly cloudy late


Intermittent clouds

Tuesday

66 °F

Sun and clouds


Mostly clear

Tuesday Night

39 °F

Mainly clear


Sunrise and Sunset

Sunrise
6:08 AM
Sunset
7:49 PM

Based on AccuWeather data