Skip to content

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

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

In Brief:

A cool front Thursday evening and another Friday evening will not only drop our temperatures to very comfortable levels over the weekend but bring back a chance of afternoon showers. We hang out within a few degrees of 80F for the next 10 days (for highs) with a system that might drop significant rain over the region Tuesday and Wednesday next week.

Forecast Discussion:

Our normal high for today is about 76F with a normal low of 46F. We are above normal, even with last night's cool down. For Wednesday, there is a chance of a few showers or thundershowers around the Front Range (Figure 1). The Tuesday PM front is draped through the state to our south.

For Thursday - there is still a general chance of showers and thundershowers over the eastern 2/3rds of the state (Figure 2) with our next cool front coming down in the evening after we hit the mid 80'sF again.

The Longer Range Forecast:

From lower 80'sF on Friday we cool to the mid/upper 70'sF over the weekend. Those mid 40'sF at night will have a snap to them (Figure 3). Over the next 5 days, very little rain will hit the state (Figure 4). Note, temperatures are still a few degrees above normal even on our upcoming coolest day.

A more significant (and slow moving) storm may roll over the state Tuesday/Wednesday next week and drop real rain over most folks. The GFS paints the foothills above Boulder and Denver with 3 inches of rain over the next 10 days! (Figure 5). The plume of tropical rains visible in yesterday's update down in the four corners area is gone - such is the way with tropical moisture sources.

For fun, the next 10 days snowfall puts down over a foot of snow in the higher elevations the middle of next week (Figure 6). We'll see!

Figure 1: The 9am screen capture of the radar and SPC thunderstorm risk map from MyRadar app from iOS.
Figure 2: The severe storm weather forecast for the U.S. from the Storm Predication Center in Norman, OK. Made Wednesday for Wednesday.
Figure 3: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 4: The forecast rainfall totals for the next 5 days from the GFS and weather5280.com
Figure 5: The forecast rainfall totals for the next 10 days from the GFS and weather5280.com
Figure 6: The forecast snowfall totals for the next 10 days from the GFS and weather5280.com

Current Weather

Mostly cloudy

Mostly cloudy

49°F

UV Index
0 Low
Pressure
29.89 Rising
Visibility
8 miles
Dewpoint
35 °F
Humidity
58%
Wind
NNE 4.9 mph
Gust
11.2 mph
Wind Chill
47 °F

Hourly Forecast

Tomorrow
12 AM
47°F
Thunderstorms
Tomorrow
1 AM
45°F
Cloudy
Tomorrow
2 AM
42°F
Mostly cloudy
Tomorrow
3 AM
40°F
Mostly cloudy
Tomorrow
4 AM
38°F
Mostly cloudy
Tomorrow
5 AM
37°F
Mostly cloudy
Tomorrow
6 AM
35°F
Mostly cloudy
Tomorrow
7 AM
38°F
Mostly cloudy
Tomorrow
8 AM
42°F
Mostly sunny
Tomorrow
9 AM
46°F
Partly sunny
Tomorrow
10 AM
50°F
Partly sunny
Tomorrow
11 AM
53°F
Intermittent clouds

7 Day Forecast

Mostly cloudy

Wednesday

68 °F

A morning shower in spots; otherwise, clouds and breaks of sun


Thunderstorms

Wednesday Night

35 °F

A thunderstorm in spots late this evening; otherwise, mostly cloudy


Intermittent clouds

Thursday

63 °F

A blend of sun and clouds


Mostly cloudy

Thursday Night

39 °F

Mostly cloudy


Partly sunny

Friday

64 °F

Some sun; breezy in the afternoon


Partly cloudy

Friday Night

36 °F

Partly cloudy


Partly sunny

Saturday

66 °F

Partial sunshine


Mostly clear

Saturday Night

41 °F

Clear to partly cloudy


Mostly cloudy

Sunday

78 °F

Rather cloudy and warmer; breezy in the afternoon


Mostly cloudy

Sunday Night

43 °F

Rather cloudy


Sunrise and Sunset

Sunrise
5:59 AM
Sunset
7:56 PM

Based on AccuWeather data