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South Dakota skies go green amid severe storms

By Thomas Leffler, AccuWeather staff writer

Published Jul. 5, 2022 8:19 PM EDT | Updated Jul. 6, 2022 12:14 PM EDT

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Before severe weather swept through the area, ominous green skies loomed over Sioux Falls, South Dakota, on July 5.

As millions of residents found themselves in the path of severe storms Tuesday, one state in particular received a colorful concoction in the skies as rain and hail fell.

Storms passed through South Dakota during the Tuesday afternoon hours, leaving behind considerable rainfall, hail and wind reports. The most unique portion of the severe weather came in its particular hue, eschewing the typical gloomy grey skies for a green shade more in common with night vision goggles than daytime thunderstorms. The hue covered the South Dakota hub of Sioux Falls throughout the late afternoon hours.

For an explanation of the sharp contrast in colors, AccuWeather Meteorologist Isaac Longley points to the late-afternoon fuel source of the storms.

The sky turns green during a severe storm in downtown Sioux Falls, South Dakota, on July 5, 2022.

Twitter/jkarmill

"Thunderstorms tend to occur later in the day due (to) the sun's energy during the day helping to fuel them," Longley stated. "As we know, the sun appears more red later in the day as it approaches the horizon."

Once light underneath tall thunderclouds is introduced, the combination of red sunlight and blue lights leads to the green colors engulfing the sky.

"Light underneath a tall thundercloud appears blue due to the scattering by water droplets," Longley said. "When the blue light is illuminated by the red light from the setting sun, it appears green, which is why some thunderstorms have that greenish hue to it."

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Video taken from Sioux Falls amidst the strong winds, thunderstorms and hail captured the greenish color, which was the view for many residents in the area:

Sioux Falls, strong winds, hail and stupid people out trying to get home before it hit. Me, I am one of those stupid people but made it home. pic.twitter.com/pGM38Gg77T

— Mhor Rioghain (@morrighansaoirs) July 5, 2022

Sioux Falls was slammed with more than 3 inches of rain within a few hours of the storms starting up Tuesday, while wind was also a top concern. Top wind gusts reported in South Dakota Tuesday included a 96-mph gust in Huron, as well as immense gusts felt in Agar (91 mph), Ree Heights (87 mph) and Wall Lake (85 mph).

Sky turns green in Sioux Falls
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"Typically, severe thunderstorm wind damage tends to be much more localized to a part of a community, whereas this cluster of thunderstorms may create widespread damage over a much larger area," AccuWeather Meteorologist La Troy Thornton explained.

More rounds of severe weather are forecast for Wednesday, according to AccuWeather meteorologists. Parts of the Dakotas will again be at risk for some disruptive storms.

Read more:

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Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.

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