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>> NOW HERE IN SAN ANTONIO WE
OFTEN DON’T SEE BEAUTIFUL
SNOWFALL IN THE WINTER TIME,
BUT WHAT WE DO SEE SOMETIMES
IS FREEZING RAIN SO WANT TO
TALK A LITTLE BIT ABOUT WHAT
FREEZING RAIN IS HOW IT FORMS
AND WHY WE GET IT HERE ON
BRIDGES AND OVERPASSES SO MUCH
AND IT RESULTS IN TRAFFIC
ACCIDENTS. FIRST THING YOU
SHOULD KNOW IS WAY UP HIGH IN
THE ATMOSPHERE. IT’S ACTUALLY
REALLY COLD SO ANY
TOPS OF THUNDERSTORMS YOU SEE
ARE USUALLY PRETTY COLD
SOMETIMES AS LOW AS 40
TO 60 BELOW 0 SO
IN THE WINTER TIME A LOT OF THE
RAIN THAT YOU SEE AROUND
ACTUALLY STARTS OFF
AS SNOW UP HIGH IN THE
ATMOSPHERE BUT AS IT FALLS
THROUGH THE ATMOSPHERE GETS
CLOSER TO THE GROUND. IT GETS
INTO A WARM LAYER RIGHT NEAR
THE GROUND AND IN SO THAT SNOW
MELTS AND IT JUST
BECOMES RAIN AND USUALLY THIS
IS WHAT WE SEE IF WE SEE ANY
KIND OF PRECIPITATION IN THE
WINTER TIME OR IN THE LATE FALL
IN SAN ANTONIO, JUST SOME
REALLY COLD RAIN.
NOW AND THEN IF WE GET A STRONG
COLD FRONT AS A RESULT IN A
VERY COLD LAYER CLOSE TO THE
GROUND THAT
ALLOWS THAT MELTED SNOW TO
IMMEDIATELY FREEZE ON IMPACT
AND YOU’LL SEE ICE ON THE
GROUND. SO SOMETIMES THAT DOES
HAPPEN IN FACT THAT HAPPENED
RECENTLY WHERE WE SAW BUT A
FREEZING RAIN ONE TUESDAY
MORNING. SO WHY IS
FREEZING RAIN SO DANGEROUS
PARTICULARLY ON BRIDGES AND
OVER PASSES. WELL, SOMETIMES
YOU’LL NOTICE THAT IF WE DO GET
A LITTLE BIT OF FREEZING RAIN.
THE GROUND ACTUALLY DOESN’T SEE
MUCH ACCUMULATION OF ICE THAT’S
BECAUSE THE GROUND IS WARM.
BUT ON BRIDGES AND OVER PASSES
RIGHT UNDER THE BRIDGES.
WE USUALLY GET A VERY COLD
LAYER OF AIR THAT CAUSES
FREEZING OF LIKE PUDDLES ON THE
BRIDGES AND SO SOMETIMES WHAT
YOU’LL SEE IS IF THERE’S A
LITTLE BIT OF RAIN CARS WILL
END UP SKIDDING
ON VERY VERY THIN. WHAT WE CALL
BLACK ICE WHICH IS JUST.
THEN LAYER OF MILLIMETERS
OF ICE AND SO THAT CAN CAUSE
SOME PROBLEMS THAT’S WHY WE SAY
DRIVE CAREFUL ON BRIDGES AND
OVERPASSES USUALLY IF WE SEE
ANY ICE PROBLEMS. THAT’S WHERE
WE SEE THEM. AROUND SAN
ANTONIO, SO NEXT TIME WE GET A
VERY ARCTIC COLD FRONT COUPLED