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Heavy snow in the Rockies, Fire weather threat in the Southwest, and Heavy rainfall threat for the weekend in the Southern Plains into the Ohio Valley

Heavy snow is expected in the northern and central Rockies. There is a critical to elevated fire risk across the Southwest. A few severe storms are expected from the Southeast States into the Great Lakes and portions of the Central Plains on Thursday. Heavy rainfall is forecast through the weekend with a threat for significant flooding for the Southern Plains into the Mississippi Valley Read More >


2017 Solar Eclipse      





  Summary and Eclipse Path | Climatology | Forecast | What is an Eclipse?

August 21, 2017

A total solar eclipse will track from the Pacific coast to the Atlantic. The shadow of the moon will begin over Oregon and move east to Idaho, Montana, Wyoming, Nebraska, Kansas, Missouri, Illinois, Kentucky, Tennessee, Georgia, and South Carolina. Totality will begin over the US in Newport, OR at 11:16 MDT and will end near Charleston, SC at 12:48 MDT. A partial solar eclipse will be viewable over the rest of the US. Totality will track directly across Wyoming and Nebraska. At the center of totality the moon will block out the sun completely for approximately 2 minutes 40 seconds. Totality time will decrease the further you are away from the center of totality. An event of this magnitude will not occur again until 2045.


Eclipse Path Map

Blue Line: Center of Totality

Red Lines: Northern and Southern Boundaries of Totality


Wyoming Eclipse Map - Path and Times

Click on Images to Enlarge

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Sunshine over most of Wyoming in the summer is a common occurrence, about 75% of the time during the summer. A minimum in cloudiness occurs in the late summer especially during the morning hours. Cumulus clouds develop almost every day contributing to partly to mostly cloudy afternoons. If you are looking for the odds of seeing the solar eclipse Wyoming the odds are in your favor. The solar eclipse will reach totality from 11:34 to 11:48 AM lasting for just over 2 minutes.


Click on Images to Enlarge


Total Mean Sky Cover and Frequency for Select Cities in Wyoming


Casper's mean hourly total sky cover based on observations from 1950 - 1990. Annual minimum shown during August from 1:00 to 5:00 AM.

Lander's mean hourly total sky cover based on observations from 1950 - 1990. Also having an annual minimum shown during August from 1:00 to 5:00 AM

Cheyenne's mean hourly total sky cover based on observations from 1950 - 1990.

Sheridan's mean hourly total sky cover based on observations from 1950 - 1990.

Casper average total sky cover frequency. Minimum cloudiness occuring in early fall.

Lander average total sky cover frequency. Sky cover minimum ranging throughout the summer months.

Cheyenne average total sky cover frequency.

Sheridan average total sky cover frequency.

Photo credit: Wyoming Climate Atlas, University of Wyoming

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August 21 2014-2016 Visible Satellite

Yearly Aug Satellite East Vis Sat


Over the last 3 years past satellite shows little cloud cover over Wyoming and Nebraska. Visible satellite images taken at 17Z (11:00 AM MDT). 2014 partly cloudy skies existed over Wyoming, and 2015 and 2016 had clear skies. In the summer the sun is not only visible a majority of the time, but also when the sun is most intense. Due to the elevation (most of Wyoming sits over 6,000 ft or 1,828 m) the sun's rays have less atmosphere to penetrate, thus eliminating the potential for haze, fog, and smoke contamination.



Mean Monthly and Annual Number of Clear Days

Wyo Cloud Stats


Monthly cloud statistics based on daylight hours only. A clear day is defined as a day with zero to three-tenths average sky cover. Due to rounding annual totals may differ from 12-month totals.

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Choose a forecast product type (temperature, wind, cloud cover, etc) and desired time from the menu/slider bars at the top of the map. The map will update automatically. Use your mouse to zoom into/pan around on the map.
National Weather Service forecasts are issued out to 7 days. Please check back for accurate forecasts near the eclipse date.

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What is an Eclipse?

There are 2 different types of eclipses: solar and lunar.

A lunar eclipse happens at nighttime and occurs when the moon passes through the shadow of the Earth. These types of eclipses are much more common and generally last for a few hours.
Lunar Eclipse
A lunar eclipse is generally viewable in the locations in which it is nighttime. Lunar eclipses occur roughly 2 to 4 times per year.

Solar eclipses on the other hand are a rare special to see. Solar eclipses occur when the moon passes in between the Earth and the Sun.
Solar Eclipse
Eclipse safety below will explain the dangerous of viewing a solar eclipse and how to view one safely.
Solar eclipses can be broken up into 2 categories: Partial and Total. Partial solar eclipse is when the moon does not completely block out the Sun. This is due to there the Moon, Sun, and Earth do not form into a perfectly straight line. A total solar eclipse is what we will experience on August 21, 2017. The Moon, Sun, and Earth will align and the moon will completely cover the sun. Only during this time is it safe to look at the eclipse without any eye protection. This will only last for a few minutes before the Moon moves and the sun will begin to reappear.
Solar Eclipse

  • This will be the first total solar eclipse on America since 1991
  • Last time a total solar eclipse was seen in Wyoming was 1979
  • The first solar eclipse to move across the entire mainland of Americe since 1918
  • Community and social events are being held across the United States click here to find one across the US.


Eclipse Safety

Safety is a big concern when viewing a solar eclipse. You should NEVER look directly at the sun during an eclipse. Looking directly at the sun is only safe during the few minutes when the sun is at the totality. That will only occur in the very narrow path of about 60 to 70 miles wide from Oregon to South Carolina (see map above).

Viewing a Solar Eclipse


The only way to safely observe a partially eclipsed sun is through special solar filtered glasses. Homemade filters and ordinary sunglasses, are not safe for looking at the Sun. There are several manufactures of eclipse glasses to meet international standards.
Solar Glasses
Glasses can be found at various online retailers and are generally inexpensive. Be sure to follow any packaging instructions and supervise children using solar glasses.


If you are looking for a DIY solar eclipse viewer a pinhole projector is a safe but indirect way to view a solar eclipse.
Pinhole Projector


Other ways to view a solar eclipse include:

  • Telescopes with a Solar Filter
  • Welder's Glass #14 or darker

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