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Update 10/13 3pm: Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – October 13-15, 2019

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

In Brief:

Very nice mild weather weather is the story for this upcoming week. A trough will pass Tuesday and kick up some winds and cool us down, but we recover to the 70'sF until the weekend. A chance of rain (and snow?) return at the start of next week.

Update 10/13 3pm:

It is too beautiful out there to stay inside at the computer long, but the snow for Sunday/Monday 10/20-21 is looking like it might be a bigger deal. This is your heads up for next weekend.

Figure 1 update: The forecast snowfall totals for the next 10 days from the GFS and weather5280com for Colorado made Saturday morning.

End update 10/13 3pm.

Forecast Discussion:

The cold front continues plow across the nation this weekend as we begin our warm-up. Dry and warmer conditions is the simple story for this long weekend (Figure 1). We'll even see 70'sF Monday (Figure 2).

The Longer Range Forecast:

A passing upper level trough cools us about 10 degrees Tuesday with a windy morning (not shown). Little precipitation is expected. We bounce back to the 70'sF for the rest of the week (Figure 2). This warmth is created by a ridge as it drifts over the state (Figure 3). There is indication of a return of cool wet weather next Sunday (Figure 2) with snow up in the mountains (some runs give us a bit of snow as well - Figure 4).

Figure 1: the surface temperature anomaly (departure from normal) from the GFS for Saturdamorning from weather5280.com.
Figure 2: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 3: The 500mb forecast upper air analysis for Wednesday AM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.
Figure 4: The forecast snowfall totals for the next 10 days from the GFS and weather5280com for Colorado made Saturday morning.

Current Weather

Light snow

Light snow

35°F

UV Index
0 Low
Pressure
30.29 Rising
Visibility
3 miles
Dewpoint
31 °F
Humidity
86%
Wind
NNE 3.4 mph
Gust
6.3 mph
Wind Chill
33 °F

Hourly Forecast

Today
7 PM
36°F
Rain
Today
8 PM
36°F
Cloudy
Today
9 PM
36°F
Snow
Today
10 PM
36°F
Cloudy
Today
11 PM
36°F
Snow
Tomorrow
12 AM
36°F
Snow
Tomorrow
1 AM
35°F
Cloudy
Tomorrow
2 AM
35°F
Cloudy
Tomorrow
3 AM
34°F
Cloudy
Tomorrow
4 AM
34°F
Snow
Tomorrow
5 AM
33°F
Snow
Tomorrow
6 AM
33°F
Snow

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