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How fresh snow can impact temperatures

Published: Friday, December 29, 2017 @ 7:55 AM

How a snow pack impacts temperatures

Fresh snow can play a big role in keeping the Miami Valley colder in the winter, according to Storm Center 7 Meteorologist Kirstie Zontini.

RELATED: Winter Weather Advisory issued ahead of accumulating snow tonight

“With no snow on the ground, sunshine warms the ground, and in turn the air,” Zontini said. “This can help us get into the 30s or 40s even during the winter when the ground is snow-free.”

RELATED: Track the latest conditions with live WHIO Doppler 7 Radar


But when snow is on the ground, the story changes, Zontini says.

>>Download the WHIO Weather App to track conditions on your mobile device

“Snow has a high albedo, which means it can very effectively reflect incoming solar radiation it receives from the sun during the day. Snow pack will reflect about 50-percent to 90-percent of the incoming solar rays back out to space and the other part is used to melt the snow,” Zontini said. 

RELATED: Photos: US dealing with burtal cold, snow heading into New Year’s holiday

Because the snow is reflecting the solar radiation, the radiation doesn’t have the ability to warm the ground and air, meaning colder temperatures during the day and at night. 

“At night, especially with clear skies, the snow is a great radiator of any little heat the earth absorbed during the day back out at night. Nights with fresh snow and clear skies in the winter can sometimes produce record-breaking low temperatures as well,” Zontini said. 

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Threat for flash flooding through Wednesday

Published: Tuesday, June 19, 2018 @ 4:24 AM
Updated: Tuesday, June 19, 2018 @ 11:30 PM

Flooding on Third Street

Clouds will linger with still a chance for a passing shower or storm overnight. Patchy fog will be possible late in areas that have heavy rain. Temperatures will drop into the lower 70s by morning, Storm Center 7 Chief Meteorologist Eric Elwell said.

>> Man hears ‘boom boom clack’ before tree falls on vehicle


  • On-and-off storms through midweek
  • Locally heavy rain possible
  • Heat to ease into the weekend

>> FLOODING: Know your risks


Wednesday: Scattered showers and storms return, but will be more widespread across the southern counties. Outside of the storms, skies will be partly sunny with highs in the lower 80s.

>> LIVE Doppler 7 Interactive HD Radar

>> How to prevent heat-related and life-threatening illnesses during extreme heat

Thursday: Partly sunny skies with a bit less humidity. A passing shower or storm is possible again in southern counties. Temperatures will climb into the lower 80s.

>> Cloudy with a chance of podcast

Friday: Scattered showers and storms spread back across the area with locally heavy rain possible. A few stronger storms are possible as well with highs again in the lower 80s.

Saturday: A chance for showers and storms are expected again. Otherwise, skies will be partly sunny with highs in the upper 70s.

>> The UV index explained

Sunday: Skies will be partly cloudy There is a slight chance for a passing shower or storm, mainly in the southern counties. Highs will be in the lower 80s. 

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WPAFB Wednesday Weather: Scattered showers, storms return 

Published: Wednesday, June 20, 2018 @ 12:09 AM

WRIGHT PATTERSON AIR FORCE BASE—Scattered showers and storms return, but will be more widespread across the southern counties.

RELATED: County-by-County Weather

Outside of the storms, skies will be partly sunny with highs in the lower 80s.

 A passing shower or storm is possible again Thursday, mainly in southern counties. Overall partly sunny skies for the day with temperatures climbing into the lower 80s and a bit less humidity.

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WHIO Doppler 7 Interactive Radar

Published: Friday, January 12, 2018 @ 1:01 AM
Updated: Tuesday, April 03, 2018 @ 5:34 AM


Track the storms as they move into the area with our Interactive Radar.

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Dayton hits first heat wave of 2018

Published: Monday, June 18, 2018 @ 11:40 AM
Updated: Tuesday, June 19, 2018 @ 5:53 AM

A stretch of warm days is needed but how warm and for how long?

In the Miami Valley, a heat wave is classified as three consecutive days or more at or above 90 degrees, according to Storm Center 7 Meteorologist Kirstie Zontini. Dayton saw two 90 degree days in a row in May and this weekend, we added two more. It officially hit 92 degrees Monday making this stretch an official heat wave in Dayton. The airport climbed to 90 degrees Saturday and 92 degrees Sunday and Monday.

RELATED: The UV index explained

The most recent heat wave was July 23-25, 2016. The last heat wave Dayton experienced in June was June 10-14, 2015. That stretch produced five days at 91 degrees! 

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