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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

Mostly clear

Mostly clear

53°F

UV Index
0 Low
Pressure
29.93 Rising
Visibility
8 miles
Dewpoint
30 °F
Humidity
41%
Wind
E 3.2 mph
Gust
5.9 mph
Wind Chill
53 °F

Hourly Forecast

Today
9 PM
51°F
Mostly cloudy
Today
10 PM
49°F
Mostly cloudy
Today
11 PM
47°F
Mostly cloudy
Tomorrow
12 AM
45°F
Cloudy
Tomorrow
1 AM
44°F
Cloudy
Tomorrow
2 AM
42°F
Cloudy
Tomorrow
3 AM
41°F
Cloudy
Tomorrow
4 AM
39°F
Mostly cloudy
Tomorrow
5 AM
38°F
Intermittent clouds
Tomorrow
6 AM
36°F
Partly sunny
Tomorrow
7 AM
35°F
Partly sunny
Tomorrow
8 AM
42°F
Partly sunny

7 Day Forecast

Mostly cloudy

Thursday

65 °F

Becoming cloudy


Mostly cloudy

Thursday Night

35 °F

Mostly cloudy


Partly sunny

Friday

71 °F

Pleasant with partial sunshine


Partly cloudy

Friday Night

38 °F

Partly cloudy


Partly sunny

Saturday

66 °F

Partial sunshine


Mostly clear

Saturday Night

41 °F

Clear to partly cloudy


Mostly cloudy

Sunday

76 °F

Rather cloudy; breezy in the afternoon


Intermittent clouds

Sunday Night

46 °F

Partly cloudy


Cloudy

Monday

60 °F

Cloudy and cooler with a shower in spots; windy in the afternoon


Mostly cloudy

Monday Night

41 °F

Breezy in the evening; otherwise, mostly cloudy


Sunrise and Sunset

Sunrise
5:58 AM
Sunset
7:57 PM

Based on AccuWeather data