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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – January 19, 2019

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

Forecast Discussion:

The snow reports will come in at 7am and through the day, so I'll update this article later on Saturday to see how our county did.  We are clearly between systems today (and Sunday) as seen in Figure 1.

For the eclipse tomorrow night (Sunday night - see my earlier invitation to visit the Cherrywood Observatory during the eclipse) - skies seem to be 50/50 on clouds (but the moon clearly 'gets past' all but the worst sky conditions). Temperatures will be a few degrees above freezing and winds will be light around 5mph (red dash in Figure 2- Sunday).  I'll add some sky forecast graphics tomorrow (Saturday afternoon) as they come out.

Figure 1: The forecast surface map for Saturday PM. From NCEP.The longer range forecast:

Monday, a very quick moving system gives a brief window of moderate to heavy snow. With marginal temperatures (yet again) weatherunderground is only giving us an inch or so (Figure 2).  The GFS is more bullish and gives us 2-3 inches.  This bears watching after the 1/2 inch NE Longmont received today - when (nearly) no snow was expected by the GFS.  Watch for an update here tomorrow!

Figure 2: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com

Figure 3: The forecast accumulated snow map from the GFS and weather5280.com for Colorado, through Tuesday noon.

Current Weather

Light snow

Light snow

33°F

UV Index
0 Low
Pressure
30.36 Steady
Visibility
2 miles
Dewpoint
31 °F
Humidity
92%
Wind
NE 1.1 mph
Gust
2.8 mph
Wind Chill
33 °F

Hourly Forecast

Today
11 PM
33°F
Snow
Tomorrow
12 AM
33°F
Snow
Tomorrow
1 AM
33°F
Cloudy
Tomorrow
2 AM
33°F
Cloudy
Tomorrow
3 AM
33°F
Cloudy
Tomorrow
4 AM
33°F
Snow
Tomorrow
5 AM
33°F
Snow
Tomorrow
6 AM
33°F
Snow
Tomorrow
7 AM
33°F
Cloudy
Tomorrow
8 AM
33°F
Flurries
Tomorrow
9 AM
34°F
Snow
Tomorrow
10 AM
35°F
Cloudy

7 Day Forecast

Rain and snow

Friday

41 °F

Chilly; rain and snow showers this morning with little or no accumulation followed by rain and drizzle this afternoon


Snow

Friday Night

33 °F

Periods of wet snow, accumulating 1-3 inches; roads could be slippery


Flurries

Saturday

39 °F

A bit of morning snow with little or no accumulation; otherwise, cloudy and cold; storm total snowfall 1-3 inches


Intermittent clouds

Saturday Night

30 °F

A shower in places in the evening; otherwise, partly cloudy


Partly sunny

Sunday

64 °F

Partly sunny and warmer


Mostly clear

Sunday Night

41 °F

Mainly clear


Intermittent clouds

Monday

79 °F

Warmer with a blend of sun and clouds


Partly cloudy

Monday Night

40 °F

Partly cloudy


Mostly cloudy

Tuesday

66 °F

Mostly cloudy and not as warm


Mostly cloudy

Tuesday Night

40 °F

Mostly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data