***AN EARLY SPRING/ MIXED WINTERSTORM*** WILL IMPACT ALL OF UPSTATE NY & THE NORTHERN PORTIONS OF PENNSYLVANIA LATER THIS EVENING THROUGH SUNDAY & HAS CAUSED THE NATIONAL WEATHER SERVICE TO ISSUE **A WINTER WEATHER ADVISORY** FOR NEARLY ALL OF UPSTATE NY & NORTHERN SECTIONS OF PA FROM LATE TONIGHT THROUGH SUNDAY: ***AN AMPLIFIED/ MID TO UPPER LEVEL TROUGH OVER THE PA/ MARYLAND BORDER WILL BECOME NEGATIVELY TILTED OVERNIGHT, AS A STRENGTHENING/ DEEPENING LOW PRESSURE SYSTEM LIFTS VERY SLOWLY NORTHEAST FROM WESTERN, VIRGINIA CURRENTLY TO THE DELMARVA PENNINSULA BY EARLY MORNING SUNDAY. THE INCREASING WRAPPING CIRCULATION AROUND THE LOW`S CENTER WILL PULL COPIOUS AMOUNTS OF DEEP- LAYERED MOISTURE WELL INLAND FROM THE NORTHWESTERN ATLANTIC OCEAN AS A CONVEYOR BELT OF MODERATE TO HEAVY RAINS ACROSS MOST OF THE EASTERN TWO THIRDS OF THE REGION EARLY THIS EVENING, BUT AS LOW- LEVEL/ NORTHERN JET STREAM WINDS UNDERCUT THE WARMER AIR ALOFT FROM A BLOCKING AREA OF HIGH PRESSURE TO THE NORTH OF THE INTENSIFYING STORM SYSTEM...SINKING COLD- ADVECTED AIR FROM THE NORTH WILL GRADUALLY MIX FREEZING RAIN, SLEET & SNOW ACROSS THE WESTERN TWO THIRDS OF THE AREA AFTER MIDNIGHT...FIRST, AT THE HIGHEST TERRAIN DOWN THROUGH THE MID TO LOWER ELEVATIONS TOWARDS DAWN, AS TEMPERATURES SLOWLY FALL INTO THE LOWER 30`S DURING THE PRE- DAWN HOURS OF SUNDAY. THIS WILL CREATE VERY HAZARDOUS/ SLIPPERY DRIVING CONDITIONS AT THE HIGHER ELEVATIONS MOST OF TONIGHT TO THE VALLEY AREAS POSSIBLY TOWARDS DAWN. THIS IS A VERY TRICKY/ FINE LINE SYSTEM, TO SAY THE LEAST & WILL MAINLY BE AN ELEVATION- TYPE ICE/ SNOW STORM EVENT WITH GENERALLY A COATING IN THE VALLEYS & RANGE FROM 2 TO 5 INCHES OVER THE HIGHER ELEVATIONS, BUT MAY EXCEED 6 INCHES OVER THE HILLTOPS OF WESTERN, NY. THE OTHER CONCERN WILL BE THE HEAVY RAINFAL...ESPECIALLY ACROSS EASTERN, PA/ EASTERN, NY WHERE 2 TO 3 INCHES IS POSSIBLE CAUSING MINOR FLOODING ISSUES, SO STAY TUNED THROUGH THE NIGHT WITH ANT POSSIBLE FLOOD ADVISORIES OR WARNINGS FOR YOUR LOCAL AREA** **FROM** STEVE MATTISON...VOLUNTEER SKYWARN SPOTTER FOR THE NWS.
Posted on: Sat, 29 Mar 2014 21:33:38 +0000
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