Skip to content

The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – October 24, 2017

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

Forecast Discussion:

The front is past and warm air will return on the southern side of the jet stream (Figure 2) and from west of the stationary front just overhead (Figure 1).  Things are very quiet again over Colorado as another warm up takes us to near 80F by Wednesday.

Figure 1: Surface analysis from Monday PM from weather.com

Figure 2: The GFS forecast 500mb upper air map for Tuesday PM. Ridges are blue lines, troughs are red lines.

In the longer range:

We are still watching the Thursday storm for cold air (starting in the morning bringing dropping temperatures all day, instead of the normal warm up to a high mid-afternoon) and potential snow. Figure 3 shows the buckling of the jet stream with cold air pushing southwest for just a day.  The NWS is talking about only a brief mix of rain and snow along I-25 Thursday afternoon.  The weatherunderground.com model is giving only a small chance of rain.  The GFS in Figure 4 is giving us 3-4 inches of snow in a brief heavy shot.

The main takeaway is that it will be quite cold for one day.  The amount of moisture is in question and hopefully will come into focus in another day of forecasting!

Figure 3: The GFS forecast 500mb upper air map for Thursday PM. Ridges are blue lines, troughs are red lines.

Figure 4: GFS total snowfall from Monday PM to Thursday PM.

Current Weather

Light rain

Light rain

39°F

UV Index
2 Low
Pressure
30.24 Steady
Visibility
7 miles
Dewpoint
35 °F
Humidity
83%
Wind
NNE 4.4 mph
Gust
8.2 mph
Wind Chill
36 °F

Hourly Forecast

Today
2 PM
40°F
Cloudy
Today
3 PM
41°F
Cloudy
Today
4 PM
42°F
Cloudy
Today
5 PM
40°F
Cloudy
Today
6 PM
39°F
Rain
Today
7 PM
38°F
Rain
Today
8 PM
37°F
Cloudy
Today
9 PM
35°F
Flurries
Today
10 PM
35°F
Cloudy
Today
11 PM
35°F
Rain and snow
Tomorrow
12 AM
35°F
Rain and snow
Tomorrow
1 AM
34°F
Cloudy

7 Day Forecast

Rain and snow

Friday

42 °F

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


Rain and snow

Friday Night

32 °F

Periods of snow; rain mixed in early, 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 chilly; storm total snowfall 1-3 inches


Intermittent clouds

Saturday Night

31 °F

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


Partly sunny

Sunday

64 °F

Partly sunny, pleasant 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

36 °F

Partly cloudy


Mostly cloudy

Tuesday

64 °F

Mostly cloudy and cooler


Mostly cloudy

Tuesday Night

40 °F

Mostly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data