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





UV Index
10 Very High
30.07 Falling
8 miles
47 °F
ESE 2.9 mph
6.2 mph
Wind Chill
91 °F


Partly sunny w/ t-storms


92 °F

Mostly sunny with the temperature near the record of 95 set in 2002; a t-storm late this afternoon

Intermittent clouds

Monday Night

61 °F

Mild with increasing clouds

Intermittent clouds


88 °F

Very warm with intervals of clouds and sun

Intermittent clouds

Tuesday Night

58 °F

Partly cloudy and mild

Intermittent clouds


88 °F

Periods of clouds and sunshine

Partly cloudy

Wednesday Night

55 °F

Partly cloudy

Partly sunny


87 °F

Very warm with sun and some clouds

Mostly clear

Thursday Night

54 °F

Clear to partly cloudy

Mostly cloudy


91 °F

Rather cloudy and very warm

Intermittent clouds

Friday Night

62 °F

Partly to mostly cloudy and mild

Sunrise and Sunset

11:33 AM
2:24 AM

Based on AccuWeather data