[MTHOLLYSVRWX] Public Information Statement : PHI@ 11/4/2014 8:01:06 AM

[svrwx at wx3i.net]

NOUS41 KPHI 041300
PNSPHI
PAZ054-055-060>062-070-071-101>106-050300-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
800 AM EST TUE NOV 4 2014

...THE WEEK OF NOVEMBER 9TH THROUGH 14TH IS WINTER WEATHER
AWARENESS WEEK IN PENNSYLVANIA...

EACH DAY WE WILL FEATURE A DIFFERENT EDUCATIONAL MESSAGE CONCERNING 
THE DANGERS AND SAFETY CONCERNS ASSOCIATED WITH WINTER WEATHER. 

TODAY'S MESSAGE...
TYPES OF HEAVY SNOW EVENTS WHICH IMPACT PENNSYLVANIA 

HEAVY SNOW CAN IMMOBILIZE A REGION AND PARALYZE A CITY...STRANDING 
COMMUTERS...CLOSING AIRPORTS...STOPPING THE FLOW OF SUPPLIES...AND 
DISRUPTING EMERGENCY AND MEDICAL SERVICES. ACCUMULATIONS OF SNOW CAN 
CAUSE ROOFS TO COLLAPSE AND KNOCK DOWN TREES AND POWERLINES. HOMES 
AND FARMS MAY BE ISOLATED FOR DAYS AND UNPROTECTED LIVESTOCK MAY BE 
LOST. THE COST OF SNOW REMOVAL...REPAIRING DAMAGES...AND THE LOSS OF 
BUSINESS CAN HAVE SEVERE ECONOMIC IMPACTS ON CITIES AND TOWNS. 

HEAVY SNOW CAN BE PRODUCED BY NOR'EASTERS...BLIZZARDS AND OVERRUNNING 
SITUATIONS. LESSER AMOUNTS OF SNOW ARE OFTEN PRODUCED BY ALBERTA 
CLIPPERS. 

NOR'EASTERS ARE INTENSE AREAS OF LOW PRESSURE THAT TYPICALLY 
DEVELOP ALONG THE EASTERN SEABOARD MOST OFTEN DURING THE LATE 
FALL...WINTER AND EARLY SPRING. THEY USUALLY BRING STRONG NORTHEAST 
WINDS TO AREAS NEAR THE COAST AS THEY MOVE NORTH ALONG IT. SOME 
MEMORABLE NOR'EASTERS IN RECENT YEARS INCLUDED THE PRESIDENT'S DAY 
SNOWSTORM OF 2003...THE FEBRUARY 11TH AND 12TH SNOWSTORM OF 2006...THE 
VALENTINE'S DAY SNOWSTORM OF 2007 AND THE SNOWSTORM OF FEBRUARY 25TH 
AND 26TH...2010. SNOWFALL RATES IN NOR'EASTERS CAN REACH 2 TO 4 
INCHES PER HOUR AND THESE RATES CAN LAST FOR SEVERAL HOURS. 

OVERRUNNING CAN ALSO PRODUCE HEAVY SNOW. THIS OCCURS WHEN WARM AIR 
ALOFT FLOWS OVER COLD AIR NEAR THE SURFACE. OVERRUNNING HAPPENS 
MOSTLY DURING THE WINTER WHEN THE CONTRAST IN AIRMASSES IS GREATEST. 
OVERRUNNING OCCURS MOST OFTEN WHEN A LARGE DOME OF HIGH PRESSURE IS 
LOCATED IN SOUTHEASTERN CANADA AND A WARM FRONT IS APPROACHING OUR 
REGION FROM THE SOUTH OR SOUTHWEST. 

AN ALBERTA CLIPPER IS AN AREA OF LOW PRESSURE THAT USUALLY DEVELOPS 
OVER THE PROVINCE OF ALBERTA IN CANADA...EAST OF THE ROCKY 
MOUNTAINS. ALBERTA CLIPPERS USUALLY MOVE VERY QUICKLY SOUTHEAST FROM 
THEIR POINT OF ORIGIN AND USUALLY BRING ONLY LIGHT SNOW AS THEY 
CROSS OUR REGION UNLESS THEY INTENSIFY OFF THE EAST COAST. THEY ALSO 
ALLOW COLDER AIR FROM CANADA TO MOVE INTO OUR REGION IN THEIR WAKE. 

SOME SNOW TERMS WHICH ARE COMMONLY USED INCLUDE BLIZZARD...BLOWING 
SNOW...SNOW SQUALLS...SNOW SHOWERS AND SNOW FLURRIES. 

A BLIZZARD IS A WINTER STORM WHICH HAS SUSTAINED WINDS OR FREQUENT 
GUSTS OF 35 MPH OR MORE...WITH CONSIDERABLE FALLING AND OR BLOWING 
SNOW FREQUENTLY REDUCING THE VISIBILITY TO AT OR BELOW ONE QUARTER 
MILE...AND THESE CONDITIONS LAST FOR 3 HOURS OR MORE. SOME OF THE 
GREATEST SNOWFALLS ON RECORD IN PENNSYLVANIA OCCURRED DURING 
BLIZZARDS. 1 TO 2 FEET OF SNOW FELL OVER A LARGE PART OF 
PENNSYLVANIA DURING THE BLIZZARD OF 1993. 

BLOWING SNOW IS WIND DRIVEN SNOW THAT REDUCES VISIBILITY. BLOWING 
SNOW MAY BE FALLING SNOW OR SNOW ALREADY ON THE GROUND THAT IS 
PICKED UP BY THE WIND. 

SNOW SQUALLS ARE BRIEF INTENSE SNOW SHOWERS ACCOMPANIED BY STRONG 
GUSTY WINDS WHICH MAY PRODUCE SIGNIFICANT SNOW ACCUMULATIONS.

SNOW SHOWERS HAVE SNOW FALLING AT VARYING INTENSITIES FOR BRIEF 
PERIODS OF TIME WITH SOME SNOW ACCUMULATION POSSIBLE. 

SNOW FLURRIES ARE LIGHT SNOW WHICH FALLS WITH LITTLE OR NO SNOW 
ACCUMULATION. 


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