Hey Ray: Relative humidity and rain
Why is it that when it's raining, the relative humidity isn't 100%?
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Why is it that when it's raining, the relative humidity isn't 100%?
The Moon is spherical like Earth, so why do we only see one side of it? Meteorologist Ray Petelin has the answer.
Heavy winds have been in the headlines lately, so has it been windier lately than it used to be in Pittsburgh?
Fluorescent bulbs can be lit up without a light fixture, but it takes caution.
The science of motion can often surprise you - and an inertia experiment could have the opposite results from what you think!
We see icicles hanging down from awnings and roofs, but have you ever seen them form sideways?
The temptation to walk or play on ice during the winter is high, but staying safe is more important. Here's how you can check if it's safe.
Whenever we get a big snowfall, people ask, "Why is snow white?" The answer, as always, is science!
People, things, and places are named for many different reasons, but how did the Arctic and the Antarctic get their names?
Every time snow is in the forecast, three magic words are uttered somewhere in western Pennsylvania!
A White Christmas is nice, but in Pittsburgh, the weather is much more interesting on December 25.
People always love to brag about how much snow they used to get back in the day, but who really has the bragging rights in Pittsburgh?
Have you ever noticed that your breath can both warm and cool things down? There is a science behind that!
Mixing drinks is a time-honored tradition, but did you know that you can use milk to knock the color out of cola?
Lighting a candle seems normal, even easy, but there's a lot of science behind getting the flame lit and keeping it lit!
A viewer asks, if it's raining outside, but the humidity gauge only reads 74%, shouldn't it be 100%? Ray Petelin has the answer in a new Hey Ray!
The Moon is spherical like Earth, so why do we only see one side of it? Meteorologist Ray Petelin has the answer.
Heavy winds and windstorms have been in the headlines a lot lately, which has plenty of Pittsburghers asking, "Is it windier today than it ever has been in Pittsburgh?" Ray Petelin explains!
Meteorologist Ray Petelin has a weird experiment today where he shows us how to illuminate fluorescent light bulbs without connecting them to a light fixture!
Science can often surprise you! Meteorologist Ray Petelin has a cool inertia experiment where the result may be the opposite of what you think!
It's common to see icicles hanging from roofs or awnings, but can they form sideways? The Barton Family saw just that, and Ray Petelin explains how it may have happened!
When rivers, lakes, and ponds freeze over, it's natural to want to go play on them, but checking them for safety is important. Ray Petelin explains what you need to do to make sure you don't fall through.
When we get large snowfalls, the same question gets asked - why is snow white but when it melts, it's clear? Ray Petelin answers that in a new Hey Ray!
KDKA meteorologist Ray Petelin uses science to debunk some popular conspiracy theories.
Places, people, and things have a variety of reasons for why they are named the way they are, but have you ever thought about why the Arctic and Antarctic have their names? Ray Petelin has and he explains it in a new Hey Ray!
As nurses from UPMC Magee Womens Hospital continue to negotiate their first union contract, two of them visited D.C. to fight for their patients.
The Pittsburgh Regional Transit said its system was an overall success at the NFL draft.
Pittsburgh leaders say they are bringing in more demolition crews as part of a city-wide blitz to knock down blighted and dilapidated buildings.
Visit Pittsburgh's CEO said he is ready to capitalize on the success of the NFL draft.
A sweeping list of cuts inside the Albert Gallatin School District could eliminate dozens of jobs.
As nurses from UPMC Magee Womens Hospital continue to negotiate their first union contract, two of them visited D.C. to fight for their patients.
King Charles is at the White House for a state dinner, after speaking about what he called the "truly unique" relationship between the U.K. and the U.S. in an address to Congress.
Ohio's Republican primary for governor is a few weeks away, but there are few signs that the top candidate sees it as a competitive race.
The suspect was identified to CBS News by law enforcement sources as 31-year-old Cole Allen of Torrance, California.
President Trump was evacuated from the White House Correspondents' Dinner after shots rang out at the hotel where the event was taking place.
Some Trader Joe's shoppers will get a payout after a lawsuit alleged that the retailer's customer receipts put shoppers at risk of ID theft.
The rising price of tomatoes is impacting some restaurants around Pittsburgh.
Music lovers tired of paying hundreds of dollars to see big-name acts may be getting some relief.
Pennsylvania Attorney General Dave Sunday is warning sports fans to watch for scams as they buy tickets and merchandise tied to the NBA and NHL playoffs.
A new consumer safety warning is raising concerns about carbon monoxide detectors sold online.
Heather is back at Sognatore for a look at a few hairstyles that turn the clock back to the 1990s for your next party, wedding, or special event.
Our next UPMC Community Hero is Melissa Fligger, a teacher in Westmoreland County, who has been making every person in her classroom feel like they matter, helping every child discover what they’re capable of in their own way and at their own pace.
Instead of handing mom a card for Mother’s Day this year, why not hand her a plate, one she didn’t have to cook herself. We have the perfect brunch recipe that she will love.
Antiques appraiser Dr. Lori is examining more of your family heirlooms and treasures.
Neubauer’s Flowers and Market House is here with a wonderful display of gifts for moms everywhere ahead of Mother's Day.
After suffering roof damage from this year's brutal winter, a Pittsburgh family says their insurance company has left them with even bigger problems.
The Downtown Neighbors Alliance's board voted Thursday to dissolve the organization.
The federal government will begin the long-awaited cleanup of a nuclear waste dump outside Apollo in Armstrong County.
Short-term rental owners in Washington County could soon face new scrutiny.
Allegheny County Common Pleas Judge Edward Borkowski refused to drop an attempted homicide charge against Jasper Hilliard.
As nurses from UPMC Magee Womens Hospital continue to negotiate their first union contract, two of them visited D.C. to fight for their patients.
A growing number of parents across the U.S. are declining routine preventive care for their newborns. Doctors say the trend is raising concerns.
Shaler Township has installed new AEDs in 10 of its parks.
Health care workers are preparing to care for anyone who will need treatment.
UPMC and AHN say they've been collaborating about getting ready for an event of this magnitude.
The Pittsburgh Steelers are giving themselves a little cover if quarterback Aaron Rodgers plays elsewhere in 2026.
Western Pennsylvania has historically been a hotbed for producing talent that succeeds in the NFL.
The St. Louis Cardinals rallied to beat the Pittsburgh Pirates 4-2 after breaking up a perfect game bid in the seventh inning.
A bounce house stood in the middle of the Pittsburgh Pirates' clubhouse before Monday night's game against St. Louis, courtesy of NL Cy Young Award winner Paul Skenes.
The Penguins defeated the Flyers 3-2 in Game 5 of their Eastern Conference playoff series on Monday at PPG Paints Arena.
The Atlanta-based railroad said Friday that it earned $547 million, or $2.43 per share, down from $750 million, or $3.31 per share, a year ago.
Some Trader Joe's shoppers will get a payout after a lawsuit alleged that the retailer's customer receipts put shoppers at risk of ID theft.
North Side business owners were left frustrated after unauthorized NFL draft no-parking signs appeared on Western Avenue.
Music lovers tired of paying hundreds of dollars to see big-name acts may be getting some relief.
The Pittsburgh Post-Gazette will stay open after it was sold to a nonprofit.
Jake was at the funeral for one of his closest friends when he learned of his parents' deaths, he said.
Gaffigan announced a continuation of his "Everything Is Wonderful!" Tour and he'll stop in Pittsburgh in November.
Western Pennsylvania natives Bret Michaels and KELS talked about their upcoming free performances at the NFL draft.
Music lovers tired of paying hundreds of dollars to see big-name acts may be getting some relief.
The trailer is out for the Pittsburgh-filmed "Hershey" biopic.
With the record-setting crowds for the NFL Draft, it was expected that traffic could be a challenge. But that never happened, in part because of the mass transit setup for fans. Chris Hoffman reports.
As nurses from UPMC Magee Women's Hospital continue to negotiate their first union contract, two of them took a trip to our nation's capital to expand the fight for their patients. Lauren Linder reports.
As nurses from UPMC Magee Womens Hospital continue to negotiate their first union contract, two of them took a trip to our nation's capital to expand the fight for their patients. Lauren Linder reports.
Stay on top of the weather in the Pittsburgh area with First Alert Meteorologist Ray Petelin's forecast.
Visit Pittsburgh's CEO said he is ready to capitalize on the success of the NFL draft.
Mike Tomlin stepped down as head coach of the Pittsburgh Steelers after 19 seasons with the team.
Pitt's regular season has ended with an 8-4 record.
Pitt's five-game winning streak came to an end with a 37-15 loss to Notre Dame.
Mason Heintschel set a new Pitt freshman single-game passing record in the Pitt win at Acrisure Stadium.
The 44th annual KDKA-TV Turkey Fund will help our neighbors in need have a nice meal for Thanksgiving.
