What's going on with all this severe weather in Pittsburgh?

IN THE CLOUD, SO IT WILL NOT BE GONE FOREVER IF YOU NEED IT BACK. >>> TODAY IS A KDKA FIRST ALERT WEATHER DAY. IF IT SEEMS LIKE THESE DAYS ARE BECOMING MUCH MORE FREQUENT, THAT IS NOT YOUR IMAGINATION. >> NOT AT ALL. IN FACT, THE WEATHER COULD GET ROCKY'S LATER TODAY. THE QUESTION, WHAT IS GOING ON? JOHN, I FEEL LIKE THIS HAS BEEN THE CONVERSATION THIS SPRING. EVERYONE IS TALKING ABOUT, WHAT IS GOING ON? >> YOU CAN'T IGNORE WHAT IS HAPPENING . THIS IS SCIENCE, CALCULATIONS, IT IS THEORY. IF YOU TALK TO FIVE METEOROLOGISTS , YOU MIGHT GET FIVE OPINIONS, BUT NOT ABOUT THIS. >> Reporter: WE HAVE SEEN THE FUNNELS, WE HAVE SEEN THE DAMAGE, AND A LOT RECENTLY RIGHT HERE IN OUR NECK OF THE WOODS HERE IS >> IT IS UNUSUAL. YOU ARE NOT IMAGINING THIS. >> ACTUALLY, THIS IS THE MOST ACTIVE SEASON I HAVE SEEN IN MY CAREER. >> THE AVERAGE NUMBER OF TORNADOES IN MY 35 COUNTIES THAT I COVER, IS SIX. AND WE ARE ALREADY AT 14 . >> IF YOU THOUGHT MAY WAS BAD, JUNE IS ACTUALLY THE MOST ACTIVE MONTH FOR TORNADOES . >> A LOT OF RAIN, A LOT OF STORMS, A LOT OF TORNADOES, IT IS ALL OF IT HAPPENING. >> Reporter: KDKA'S METEOROLOGIST AND NATIONAL WEATHER SERVICE CHIEF SEVERE FORECASTER, FRED McMULLEN, SAYS, WE ARE REAPING WHAT THE WOODS ARE SOLD. >> WE DID NOT HAVE MUCH OF A WINTER, SO WE GET MORE MOISTURE HELP FEELING THESE STORMS . >> WE HAD A REALLY WARM WINTER. IT NEVER COOLED DOWN. WE HAD 80s IN MAY AGAIN, UPPER 80s . SEGMENT YOU NEED TWO INGREDIENTS FOR STORMS, WARM, MOIST AIR AND AN ATMOSPHERE. >> AND LATELY, WE HAVE NOT HAD THE COOL NIGHTS TO RECOVER. >> A LOT OF OUR RECORDS HAVE BEEN THAT WARM LOW, HAS BEEN A RECORD WE HAVE NEVER SEEN BEFORE. >> LITTLE THINGS ADD UP INTO SOMETHING MUCH BIGGER AND WE ARE SEEING BIGGER THINGS. >> THEY TELL ME, THIS DOES NOT MEAN IT NECESSARILY WILL BE THIS WAY EVERY YEAR FROM NOW ON. >> THIS IS NOT SOMETHING WE WILL SEE EVERY YEAR, DOES NOT LOOK LIKE WHAT TYPICALLY HAPPENS . >> LOOKING AT THE NEXT TWO WEEKS, IT LOOKS LIKE THE PATTERN WILL COOL DOWN A LITTLE BIT. I THINK OVERALL THIS SUMMER, WHAT YOU ARE LOOKING AT IS VERY HOT WEATHER. >> FIRST, WE HAVE TO GET THROUGH TODAY'S FIRST ALERT WEATHER DAY AND THROUGH THE REST OF THE MONTH OF JUNE. AS MARY POINTED OUT, JUNE USUALLY IS MUCH WORSE . HANG ONTO YOUR HATS. >> THIS VOLATILE WEATHER IS NOT A TEAR WE HAVE SEEN DAY IN AND DAY OUT, WE HAVE BEEN REPORTING ALL ACROSS THE COUNTRY. >> SECOND HIGHEST NUMBER OF TORNADOES THIS YEAR AND IT IS ONLY JUNE. >> SINCE MODERN RECORDS STARTED BACK IN 1990 FOR TORNADOES, IT IS A LOT OF TORNADOES THAT HAVE HAPPENED ALREADY AND EVEN HERE IN PITTSBURGH, VERY UNUSUAL. WE STILL EVEN HAVE THAT COMING UP IN JUNE, WHERE THAT IS THE MOST ACTIVE MONTH. >> A LOT OF PEOPLE DON'T THINK ABOUT TORNADOES HERE. THAT IS THE OTHER THING THAT IS WILD . >> EVERYBODY HAS BEEN TALKING