Solar Eclipse Weather

Total Eclipse of the sun August 21st, 2017. This page will update weather forecast information along the path, to help you plan where the clearest skies might be for viewing this event. This page also features links to the best websites with information about the Eclipse to help you prepare for viewing.

Countdown to start of Eclipse over Jackson, WY

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Weather Outlook & Eclipse Info

Cloud Cover Forecast box below will be updated this weekend by 9:00 MDT. By 7:00 MDT on Monday morning. One cloud cover forecast map from computer models is displayed, others can be viewed by clicking “More+“. All maps are valid for Noon Mountain Daylight Time on August 21st. (That is: 1100 PDT, 1200 MDT, 1300 CDT, 1400 EDT) .

Maps Updated 0915 MDT August 19th

Latest Outlook updated: Saturday, August 19th, 2017

Read meteorologist Jim Woodmencey’s latest Eclipse Weather Outlook. Click Here>>

Wyoming Cloud Cover Forecasts

Regional cloud cover forecast maps valid for 12:00 Noon MDT on August 21st are shown below, from three different models, focus is on Wyoming.

NEMS Model

NEMS Model: Wyoming

NEMS Model:

NOAA Environmental Modeling System

Scale is from white or light gray representing 10 to 25% sky cover. Up to very dark gray representing near 100% cloud cover.

European Model

ECMWF Model: Wyoming

ECMWF Model:

European Center for Medium-range Weather Forecasts

a.ka. The “Euro” Model

Scale is from a dim but darker gray, representing 10 to 30% cloud cover. To a dim but whiter shade, representing something more than 50% cloud cover. To areas where cloud cover is hatched and colorized,  representing 80 to 100%, and precipitation is also likely.

 

GFS Model

GFS Model: Wyoming

GFS Model:

Global Forecast System

Scale of cloud cover:
CLR = Clear skies
FEW = 10 to 20%
SCT = 30 to 50%
BKN = 60 to 70%
OVC= Overcast or 100%

Jackson Hole Cloud Cross-Sections

These cloud cross-sections are centered over Gros-Ventre Jct. near the Jackson Hole Airport, under the center of the max line. They are Valid for 10:00 am & Noon on August 21st. The scales on the left side show the percent cloud cover (colors) & also altitude in Kilometers. The South to North panel extends about 50 miles north & south. The West to East panel cover s about 70 miles West & East of the location.

10:00 am over Jackson Hole

10:00 a.m. Cross Section

Cross sections generated from the NEMS Model

Noon over Jackson Hole

Noon Cross-Section

Cross sections generated from the NEMS Model

See historic Aug. 21st Satellite images on the MountainWeather Blog. Click Here>>

Viewing Times & Data

Start times are for beginning of Partial Eclipse. The Total Eclipse peak time is the point of the Maximum Eclipse. The End Time is when the Partial Eclipse is completely over. All times are local MDT.

Eastern Idaho

Idaho Falls, ID
Start Time= 10:15 am
Total Eclipse peak= 11:33 am
End Time= 12:57 pm

More Details:
All times MDT

Start of Total= 11:32:34 am
End of Total= 11:34:51 am
Duration of Total= 2min 18sec
Altitude of Sun at Peak= 49° (above the horizon)
Azimuth of Sun at Peak= 132° (Southeastern sky)

Location under center line:
I-15 & HWY 33 at Sage Junction

 

Jackson Hole Area

Jackson, WY
Start Time= 10:16 am
Total Eclipse peak= 11:36 am
End Time= 1:00 pm

More Details:
All times MDT

Start of Total= 11:35:00 am
End of Total= 11:37:20 am
Duration of Total= 2min 20sec
Altitude of Sun at Peak= 50° (above the horizon)
Azimuth of Sun at Peak= 135° (Southeastern sky)

Location under center line:
Gros Ventre Jct.-Kelly Road

Central Wyoming

Casper, WY
Start Time= 10:22 am
Total Eclipse peak = 11:43 am
End Time= 1:09 pm

More Details:
All times MDT
Start of Total= 11:42:38 am
End of Total= 11:45:04 am
Duration of Total= 2min 26sec
Altitude of Sun at Peak= 54° (above the horizon)
Azimuth of Sun at Peak= 143° (South-SE Sky)

Location under center line:
Casper College

Where the best viewing weather might be…read Jim’s column from the JH NaG>>

NWS Point Forecasts

Hit “More+” under each region to see links to National Weather Service Point Forecast data for specific locations under the path of totality. These graphical forecasts include Sky-Cover forecasts, the blue line shows the percent of cloud cover predicted overhead, hour-by-hour, for the next 5 to 6-Days.

NOTE: Anywhere within the shaded area on the maps will experience a TOTAL Eclipse. The duration of the eclipse will be longest along the red center-line.

Eastern Idaho

Idaho Weather Access Map

Graphical Point Forecasts:

Pick your own Point Forecast:
Use the IDAHO W.A.M.

Use pre-set location icons,
or move blue magnifying glass
to a specific location.

Western Wyoming

Wyoming Weather Access Map

Graphical Point Forecasts:

Pick your own Point Forecast:
Use the WYOMING W.A.M.

Use pre-set location icons,
or move blue magnifying glass
to a specific location.

Central-East Wyoming

Wyoming Weather Access Map

Links to Point Forecasts:

Pick your own Point Forecast:
Use the WYOMING W.A.M.

Use pre-set location icons,
or move blue magnifying glass
to a specific location.


For a Printable Eclipse Fact Sheet from NASA, Click Here>>

Mike Zeiler’s Animation of the Eclipse shadow crossing the Tetons, Click to View>>

 

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