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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – December 5, 2018

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

Forecast Discussion:

I'm working on getting the inside decorations up now, so I'll use this quiet weather period to go 'lite' on the posting. Eventually we'll have so much weather I won't be able to fit it all here. Just not this week.

The weather map, minus a weak lee trough (black dashed line in Colorado), is still quiet.  The next system is occluding (purple front) out on the West coast. It next heads past us to the south (Figure 1) over the next 48 hours.

The snowfall over the next 48 hours really really meager across Colorado (Figure 2). We may see a dusting to a coating again tonight through Thursday AM.

Figure 1: The current surface map from Tuesday PM and the Weather Channel.

Figure 2: The forecast accumulated snow map from the GFS and weather5280.com for Colorado, through Thursday afternoon. Longmont is the pink dot, as always.

Forecast Discussion:

We have the current cold front pass mid-afternoon today followed by about 12 hours of elevated light snow chances. This does put us at near freezing for a day and a half. The next warm up continues until a double (dry, it seems) cold front hit comes Tuesday and Wednesday next week (Figure 3).

Even over the next 10 days (Figure 4) Longmont does not expect (from the GFS) to see any more snow than it gets over the next day or so. The mountains will see more snow with the systems next week at least. That is important for long term water supplies and ski resort happiness. Crazy way to run a late-Fall.

Figure 3: the graphical forecast for the next 10 days forecast for Longmont, CO from weatherunderground.com

Figure 4: The forecast accumulated snow map from the GFS and weather5280.com for Colorado, through the next 10 days.

Current Weather

Cloudy

Cloudy

39°F

UV Index
0 Low
Pressure
29.94 Rising
Visibility
9 miles
Dewpoint
38 °F
Humidity
95%
Wind
NW 0.5 mph
Gust
1.1 mph
Wind Chill
39 °F

Hourly Forecast

Today
8 AM
39°F
Cloudy
Today
9 AM
42°F
Cloudy
Today
10 AM
46°F
Mostly cloudy
Today
11 AM
49°F
Mostly cloudy
Today
12 PM
52°F
Cloudy
Today
1 PM
55°F
Cloudy
Today
2 PM
57°F
Cloudy
Today
3 PM
58°F
Thunderstorms
Today
4 PM
59°F
Mostly cloudy
Today
5 PM
61°F
Mostly cloudy
Today
6 PM
59°F
Mostly cloudy
Today
7 PM
57°F
Intermittent clouds

7 Day Forecast

Thunderstorms

Sunday

61 °F

Mostly cloudy and warmer; a thundershower in spots this afternoon


Partly cloudy w/ t-storms

Sunday Night

37 °F

An evening thunderstorm in parts of the area; otherwise, partly cloudy


Partly sunny

Monday

70 °F

Partly sunny, pleasant and warmer


Intermittent clouds

Monday Night

43 °F

Partly cloudy


Mostly sunny

Tuesday

73 °F

Mostly sunny and pleasant


Mostly cloudy

Tuesday Night

41 °F

Mostly cloudy


Intermittent clouds

Wednesday

65 °F

Times of sun and clouds with a passing shower in the afternoon


Intermittent clouds

Wednesday Night

39 °F

A thundershower in spots in the evening; otherwise, partly cloudy


Rain

Thursday

49 °F

Chilly with rain and drizzle


Partly cloudy

Thursday Night

28 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:03 AM
Sunset
7:53 PM

Based on AccuWeather data