Skip to content

Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – November 10th, 2018

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

Forecast Discussion:

We warm up to near normal for a day today as a short wave ridge zips past. (As seen in Figure 6, normal highs are around 55F and lows around 27F this week of the year.)

The ridge is the blue line to our west-ish in Figure 1.  Our big trough, for the weekend storm, is down to the southwest of us. We'll cover that in Figure 2 and the longer range forecast below...

Figure 1: The water vapor satellite image from Friday AM from NOAA. Longmont is the pink dot. Red lines are approximate locations of upper air troughs, blue lines upper air ridges.

The longer range forecast:

The upper air pattern for Sunday PM show the big trough consolidating north to south and is sliding towards us (Figure 2). That is the lift needed for the next snow storm.  Figure 3 is the abnormally cold air (in blue). There are three blobs, one coming out of Canada, one pressed up against the Rockies over us, and one down in Texas.

What do the models say currently about snow amounts?  Weatherunderground is calling for 1-3 inches (Figure 6). The GFS has about the same 1-3 inches (Figure 4). The NAM has about 2.5 to 3.5 inches (Figure 5).

Figure 2: The 500mb forecast upper air analysis for Sunday PM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.

Figure 3: The temperature departure from normal national forecast map for Sunday midday. Longmont is the pink dot.

Figure 4: The forecast accumulated snow map from the GFS and weather5280.com for Colorado for the next 4 days, through Monday PM. Longmont is the pink dot, as always.

Figure 5: The forecast accumulated snow map from the NAM and tropicaltidbits.com for Colorado for the next 3 days, through Monday noon. Longmont is the pink dot, as always.

Figure 6: the piece of the next 10 days of the graphical forecast for Longmont, CO from weatherunderground.com

Current Weather

Mostly clear

Mostly clear

55°F

UV Index
0 Low
Pressure
29.9 Rising
Visibility
7 miles
Dewpoint
45 °F
Humidity
67%
Wind
NNW 3.9 mph
Gust
9.6 mph
Wind Chill
55 °F

Hourly Forecast

Today
1 AM
52°F
Partly cloudy
Today
2 AM
50°F
Mostly clear
Today
3 AM
47°F
Mostly clear
Today
4 AM
45°F
Clear
Today
5 AM
43°F
Mostly clear
Today
6 AM
41°F
Mostly clear
Today
7 AM
45°F
Partly sunny
Today
8 AM
50°F
Partly sunny
Today
9 AM
55°F
Partly sunny
Today
10 AM
62°F
Intermittent clouds
Today
11 AM
66°F
Intermittent clouds
Today
12 PM
70°F
Intermittent clouds

7 Day Forecast

Mostly sunny

Wednesday

75 °F

Mostly sunny, pleasant and warmer


Partly cloudy

Wednesday Night

41 °F

Patchy clouds


Mostly cloudy w/ t-storms

Thursday

75 °F

Turning cloudy, warm; breezy, a thunderstorm around in the afternoon


Thunderstorms

Thursday Night

49 °F

A thunderstorm in spots in the evening; otherwise, considerable cloudiness


Thunderstorms

Friday

70 °F

Mostly cloudy with a couple of thundershowers


Thunderstorms

Friday Night

46 °F

Cloudy with a couple of thundershowers


Rain

Saturday

50 °F

Chilly with periods of rain and a thunderstorm


Rain and snow

Saturday Night

39 °F

Cloudy with rain, mixed with a little snow late


Mostly cloudy

Sunday

59 °F

Mostly cloudy with a stray thundershower in the afternoon


Partly cloudy

Sunday Night

36 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:08 AM
Sunset
7:49 PM

Based on AccuWeather data