>>> IF YOU LOOK OUT YOUR WINDOW AND WONDERED WHAT'S GOING ON?

YOU ARE NOT ALONE.

TODAY'S LIGHT SNOWFALL IN BELOW FREEZING WIND CHILL MIGHT BE MAKING LAST WEEK'S RECORD-SETTING WARM WEATHER FEEL LIKE A NOW DISTANT MEMORY.

JOINING US WITH MORE ON THE UNPREDICTABLE WEATHER IS TREND THE STATE CLIMATOLOGIST WELCOME BACK.

>> THANK YOU.

>> WHY DID IT GET SUPER COLD TODAY FOLLOWING THE WARM WEATHER WE JUST HAD?

>> THEY ARE ACTUALLY RELATED THE WARM WEATHER LAST WEEK WAS THE RESULT OF A PERSISTENT RANGE WHICH IS BULGING NORTH OF THE JET STREAM.

IT BRINGS UP WARM AIR FROM THE SOUTH AND LETS AIR SING FROM THE TOP DOWN.

NOT ONLY IS THE AIR WARM, IT WAS ALSO REALLY DRIVE.

WE HAD DAYS WHERE HIGHS WERE IN THE 80s BUT THE RELATIVE HUMIDITY WAS 17 OR 18% WHICH IS REALLY RARE.

ON THE BACKSIDE OF THAT RIDGE COMES THE TROUGH.

WHEN IT MOVES OFF TO THE EAST, THE TROUGH COMES IN WHICH IS A DIP IN THE JET STREAM BRINGS US COOLER AIR ALSO GUIDES LOW PRESSURE SYSTEMS STORM SYSTEMS INTO THIS PART OF THE COUNTRY AND THAT'S WHAT HAPPENS.

IT'S COLD AIR AND PRECIPITATION BRINGING THE STORM SYSTEM MADE FOR THAT SNOW AND RAIN MIX.

THE TWO ARE RELATED TO EACH OTHER.

>> I.D.s BIG SHIFTS AND THE WEATHER IS THAT NORMAL OR SOMETHING WE SHOULD WORRY ABOUT?

>> LOOKING BACK ON IT -- THE DIFFERENCE BETWEEN TODAY'S HIGH WAS 40 DEGREES WHICH IS FAIRLY RARE BUT IT DOES HAPPEN ONCE EVERY 10 MINUTES 15 YEARS OR SO AND CERTAINLY WE GET 20-30 DEGREES SHIFT FAIRLY COMMONLY.

WE LOOKED AT APRIL AS THE MOST COMMON TIME OF YEAR WHEN WE GET BIG LEATHER SHIFTS BECAUSE AREAS FURTHER TO THE SOUTH ARE WARMING UP .

WE GET THE CLASH OF AIR.

EVEN THOUGH IT SEEMS LIKE IT WAS A CHANGE FROM ONE DAY TO ANOTHER THIS TIME OF THE YEAR IT'S FAIRLY COMMON.

I THINK THE BIG RARITY WAS HOW PERSISTENT THE WARM WEATHER WAS LAST WEEK MAKING TODAY'S WEATHER SEEN THAT MUCH MORE ANOMALOUS.

>> WE JUST HAVE A FEW SECONDS LEFT BUT WHAT SHOULD WE EXPECT?

>> LOOKS LIKE THE COOLER WEATHER WILL STICK AROUND.

NOT