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The Next Storm/Next Snow and Lunar Eclipse Forecast Discussion from the Cherrywood Observatory – January 30, 2018

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

Forecast Discussion:

Bring on the heat!  The ridge overhead is at a maximum today (Figure 1).  The forecast high for today is 62F - some 17 degrees above normal.  The westerly jet flow will still bring clouds overhead at times.

Now let's turn to the change in the weather AND the eclipse Wednesday morning.  You are still invited to come to the Cherrywood Observatory at 4:45am to 6am at 507 Cherrywood Dr. IF it is not thickly overcast and/or raining or snowing.  I will post a Go or No Go here on the active/current post for Wednesday morning (probably around 4:15 to 4:30am). Check back on the Wednesday post that will go live at 1am.

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Tuesday AM Update: The cloud forecasts for the morning eclipse don't look significantly different.  All of the models but one have some to significant cloudiness at 4:45am through 6am. The forecast discussion for tomorrow will appear at 1am, as usual.

I'll post a Go or No Go on that post around 4:15am.  I hope to see you there!

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Storm timing - The front should come through around 8am. Rain chances (later snow) rise after 5pm on Wednesday. Cloud cover from weatherunderground.com is at 50% rising to overcast later in the day.

Figure 2 shows cloud cover on the top line and sky transparency on the second line.  According to this model, it looks pretty good for the eclipse!

Figure 3 is the top line in this chart (Figure 2) in map form.  There are mountain clouds, but things are good at the Plus sign for Longmont.

Figure 4 is the second line in the chart (Figure 2) in map form. Transparency doesn't look as good, so dim galaxies and star clusters I might be able to normally show as a side-show, will be invisible.

Figure 5 is the GFS's idea for cloud cover and it has us fairly cloudy, but not as bad as the mountains to our west.

Figure 6 is a Chinese model for sky conditions and IT has us completely overcast.  Bad news.

Finally, Figure 7 shows the snowfall from the GFS and it has us surrounded by a trace to 1 inch of snow - we are in a down slope hole it seems.  Blah.

Figure 1: The 500mb upper air forecast map for Tuesday morning from tropicaltidbits.com and the EPS.

Figure 2: The clear sky chart for the Cherrywood Observatory with the eclipse highlighted with a red arrow.

Figure 3: The clear sky map of cloud cover for the Cherrywood Observatory with Longmont highlighted with a red arrow.

Figure 4: The clear sky map of sky transparency for the Cherrywood Observatory with Longmont highlighted with a red arrow.

Figure 5: The GFS simulated IR cloud forecast map for Wednesday morning (eclipse time). Longmont is the pink dot.

Figure 6: The 7! Timer version of the clear sky chart - model is run in China. The eclipse is colored red.

Figure 7: The total snowfall between Monday PM and Thursday midday from the GFS and Weather5280.com

The longer range forecast:

We see another small storm for Saturday/Sunday and cooler temperatures for the next week, but we'll look at that after the Wednesday storm shapes up.

Current Weather

Cloudy

Cloudy

34°F

UV Index
0 Low
Pressure
30.2 Steady
Visibility
7 miles
Dewpoint
32 °F
Humidity
93%
Wind
NNE 2.3 mph
Gust
3.9 mph
Wind Chill
34 °F

Hourly Forecast

Today
7 AM
35°F
Cloudy
Today
8 AM
34°F
Intermittent clouds
Today
9 AM
35°F
Intermittent clouds
Today
10 AM
36°F
Intermittent clouds
Today
11 AM
38°F
Rain and snow
Today
12 PM
40°F
Intermittent clouds
Today
1 PM
41°F
Intermittent clouds
Today
2 PM
42°F
Cloudy
Today
3 PM
43°F
Cloudy
Today
4 PM
41°F
Cloudy
Today
5 PM
40°F
Cloudy
Today
6 PM
39°F
Rain

7 Day Forecast

Rain and snow

Friday

43 °F

Chilly with some sun, then turning cloudy; a morning rain or snow shower in spots followed by a little rain this afternoon


Rain and snow

Friday Night

32 °F

Periods of snow; rain mixed in early, accumulating 1-3 inches


Flurries

Saturday

40 °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

Partly cloudy


Partly sunny

Sunday

64 °F

Partly sunny, pleasant and warmer


Partly cloudy

Sunday Night

41 °F

Partly cloudy


Intermittent clouds

Monday

79 °F

Warmer with a blend of sun and clouds


Partly cloudy

Monday Night

36 °F

Partly cloudy


Intermittent clouds

Tuesday

64 °F

Cooler with periods of clouds and sunshine


Mostly cloudy

Tuesday Night

40 °F

Mostly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data