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!
The Penguins announced contract extensions for forward Connor Dewar and defenseman Ilya Solovyov.
Pittsburgh is locked into a pattern of cool weather that will continue for a couple of weeks.
While we're all ready to celebrate moms on Sunday, let's not forget the dog moms on Saturday!
Larry Russ and Bobby Trygar each have worked at Kennywood Park for 50 years.
Paul Skenes threw eight brilliant innings in one of the best outings of the young star's career, Brandon Lowe hit a solo homer and the Pittsburgh Pirates edged the Arizona Diamondbacks 1-0.
Pennsylvania state lawmakers on both sides of the aisle are talking about suspending the gas tax for some relief.
Democratic Gov. Josh Shapiro raised $3.6 million over five weeks, an aide said.
Live updating Ohio primary election results for May 5, 2026.
A Character AI chatbot falsely claimed to be a licensed psychiatrist in Pennsylvania and provided an invalid license number, the state alleged.
Voters headed to the polls on Tuesday in Ohio and Indiana — in the Buckeye State, they cast ballots in Senate, House and governor's primary races, while Hoosiers are weighing in on House and state races.
Pennsylvania state lawmakers on both sides of the aisle are talking about suspending the gas tax for some relief.
If you're about to throw out all of those old documents while spring cleaning, there are some you should hold onto.
All three remaining Smokey Bones locations in the Pittsburgh area have closed after the restaurant chain's parent company filed for bankruptcy.
Wegmans now owns the land in Cranberry Township that will house its first Pittsburgh-area location.
As the war in Iran continues, the impact is hitting Americans' wallets, especially at the gas pump.
Mikey is introducing us to Jordan. Ge has big energy and even bigger jumps! They visit Sky Zone Trampoline Park in Monroeville to burn some energy and learn what Jordan is looking for in a family.
Big hair energy is back in a big way. We're revealing the spring cuts delivering serious cool girl vibes. Your next hair era could be one appointment away!
Mikey Hood is live at Shly Deck & Fence in Carnegie to find out what it takes to get the deck of your dreams built at your own home and how to enter the Ford Truck and Ten Thousand Dollar Deck Giveaway!
Korean fried chicken has become one of the fastest-growing food trends in the country. And now it's landed in the South Hills. Here from the Krunchy Bird in Castle Shannon are the owner, Noah, and the head chef, Jess.
This year's Gene Kelly Award nominees for excellence in high school musical theater were announced live on PTL! The awards have become a major launching pad to Broadway and Hollywood. Pittsburgh CLO's director of education, Jim Scriven, did the honors for best high school musical.
An artist in Pittsburgh said the Steel City clothing company used his artwork without his permission.
Alcosan's multi-billion-dollar construction project to clean up the rivers in southwestern Pennsylvania is already over budget.
Pennsylvania prisons now give suboxone to thousands of inmates, with thousands more on the waiting list.
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.
A new report from Public Citizen identified several Pittsburgh-area hospitals that could be at risk of closing due to federal budget cuts.
Allegheny Health Network's Psychiatry and Behavioral Health Institute moved to a new space on Friday.
Across the country, there's a rise in cases of a seasonal illness that's causing medical professionals to speak out.
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.
The Penguins announced contract extensions for forward Connor Dewar and defenseman Ilya Solovyov.
Western Pennsylvania has historically been a hotbed for producing talent that succeeds in the NFL.
Paul Skenes threw eight brilliant innings in one of the best outings of the young star's career, Brandon Lowe hit a solo homer and the Pittsburgh Pirates edged the Arizona Diamondbacks 1-0.
The former left fielder and coach died on Monday, May 4.
Dr. Wayne Sebastianelli spent more than 30 years as Penn State University's Director of Athletic Medicine.
If you're about to throw out all of those old documents while spring cleaning, there are some you should hold onto.
The hole left behind by Spirit will hit businesses and rental companies within Arnold Palmer Regional Airport.
The bar served its final pints Sunday night after 43 years in Oakland, near the heart of Pitt's campus.
Arnold Palmer Regional Airport officials are confident they'll be able to replace Spirit Airlines after the airline shut down early Saturday morning.
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.
Ten Carnegie Mellon University alumni have snagged nominations for Tony Awards.
A converted church in rural central Pennsylvania has become a place where musicians with Amish roots are coming to record music and make videos.
The newly announced tour will be at PPG Paints Arena for two nights in September.
Musgraves will perform at PPG Paints Arena on Tuesday, September 8.
Jake was at the funeral for one of his closest friends when he learned of his parents' deaths, he said.
Get the latest weather updates with meteorologist Ron Smiley’s forecast!
We're all ready to celebrate Mother's Day on Sunday, but one day before that, we'll celebrate the bond between dogs and their moms. John Shumway spoke with one dog trainer about the special bond between the two.
KDKA-TV's Rich Walsh and 93.7 The Fan's Chris Mueller discuss the sports topics of the day.
An historic church in Allegheny County, Indiana Township, suffered significant damage in a fire on Wednesday afternoon.
Two people are dead after five vehicles were involved in a crash near the Fort Duquesne Bridge in Pittsburgh.
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.
