The AccuWeather.com RealFeel® Temperature was created in the 1990s by Joel N. Myers, Michael A. Steinberg, Joseph Sobel, Elliot Abrams and Evan Myers.
The RealFeel Temperature is an equation that takes into account many different factors to determine how the temperature actually feels outside. It is the first temperature to take into account multiple factors to determine how hot and cold feels.
Some of the components that are used in the equation are humidity, cloud cover, winds, sun intensity and angle of the sun. Humidity is a large contributor to determining the RealFeel, but the time of the day also is important, due to the angle of the sun.
In the morning the low angle of the sun gives off less heat because the energy is spread out, according to AccuWeather.com Expert Senior Meteorologist Dan Kottlowski. In the afternoon, the sun is overhead and the sun's energy is more direct and gives off more energy, making it feel warmer.
"The RealFeel takes into consideration the angle of the sun and its affects on an object or the body," Kottlowski said.
Once the equation was created, the inventors took the RealFeel to AccuWeather.com meteorologists, media and the public to make sure they weren't missing anything and to gather research on how they could improve the product, Steinberg said.
The equation also takes into consideration how people perceive the weather. Steinberg said that this can be debated, since not everyone perceives weather the same way, but the equation uses the average person's perception of weather and adds that into the RealFeel equation. The RealFeel Temperature can be used throughout all four seasons with the same equation.
Wind is a main component that determines how people perceive the weather and a factor that is used to determine the AccuWeather RealFeel. AccuWeather.com Senior Meteorologist Kristina Pydynowski, said that the wind can make a person feel colder because the cold wind blowing removes heat from your body.
"The stronger the wind, the faster the heat is getting removed from your body, so it will feel colder outside," Pydynowski said.
Humidity is another component in equating the RealFeel and also plays a role in how people feel outside. If there is low humidity in the air (meaning less moisture) when you sweat, the moisture is able to evaporate. This works as your body's cooling process, so you won't feel as hot. If there is high humidity in the air, the evaporating process is slowed down or stopped because there is already a lot of moisture in the air.
"That is why you get the sticky feeling, because the sweat isn't able to evaporate as efficiently," Pydynowski said.
The AccuWeather.com RealFeel Temperature is one of a kind because AccuWeather is the only company that can use more than two elements in its equation, to determine the RealFeel because of the patents that AccuWeather has, Steinberg said.
The potential for locally dangerous and disruptive thunderstorms will exist over the Midwest during Tuesday and Wednesday.
After a mild and dry Memorial Day, warmth will build across the northwestern United States.
Rounds of heavy thunderstorms will raise the risk of flooding across the south-central United States into Friday.
Temperatures and humidity levels will throttle back as dry air expands southward in the northeastern United States through the middle of the week.
Despite no longer being a tropical storm or depression, Bonnie will induce daily showers and thunderstorms across the Carolinas into the middle of the week.
Extremely heavy rain fell over the weekend in southwestern Germany, leading to dangerous and deadly flash flooding.
Ohio, Pennsylvania Ontario (1985)
Great tornado outbreak, reported to be the worst in Pennsylvania history. Path of destruction included 1,200 homes in Ohio alone. Eighty-nine people were killed and 550 injured. Considered by many to be the worst outbreak in the U.S. since April 3, 1974. The outbreak of tornadoes spun 21 well-defined tracks, one as long as 56 miles. Most of the tornadoes in PA, OH and southern NY were spawned from 9 different storm centers that began in the lower Great Lakes. The most violent tornado ran from Ravenna Arsenal, OH, southeast of Youngstown,OH, a distance of 41 miles to Mercer, PA. An airplane wing was carried 10 miles by the tornado.
Washington, DC (1991)
An average temperature of 73 degrees, making May 1991 the warmest May on record. There were a record 11 days of 90-degree heat.
Walla Walla, WA (1991)
6.63" of rain -- the wettest month in 105 years of record keeping.