[MTHOLLYSVRWX] Public Information Statement : PHI@ 11/8/2011 8:14:09 AM

[svrwx at wx3i.net]

NOUS41 KPHI 081313
PNSPHI
PAZ054-055-060>062-067>071-081715-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
813 AM EST TUE NOV 8 2011

...PUBLIC INFORMATION STATEMENT...

...THIS WEEK IS WINTER WEATHER AWARENESS WEEK IN PENNSYLVANIA...

YOUR NATIONAL WEATHER SERVICE IS URGING YOU TO PREPARE FOR THE 
HARSH...AND SOMETIMES DANGEROUS WEATHER THAT THE WINTER SEASON OFTEN 
BRINGS. 

THIS MESSAGE WILL PROVIDE YOU WITH SOME INFORMATION ON THE 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 POWER LINES. 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 NOREASTERS...BLIZZARDS AND OVERRUNNING 
SITUATIONS. LESSER AMOUNTS OF SNOW ARE OFTEN PRODUCED BY ALBERTA 
CLIPPERS.

NOREASTERS ARE INTENSE AREAS OF LOW PRESSURE THAT TYPICALLY DEVELOP
ALONG THE EASTERN SEABOARD MOST OFTEN DURING 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 
NOREASTERS IN RECENT YEARS INCLUDED THE PRESIDENTS DAY SNOWSTORM OF 
2003...THE FEBRUARY 11TH AND 12TH STORM OF 2006...THE VALENTINES DAY 
SNOWSTORM OF 2007 AND THE SNOWSTORM OF FEBRUARY 25TH AND 26TH 2010. 
SNOWFALL RATES IN NOREASTERS 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.

ALL OF OUR WEATHER INFORMATION IS AVAILABLE ONLINE. SIMPLY GO TO 
WEATHER.GOV AND THEN CLICK ON THE PHILADELPHIA REGION. THIS WILL TAKE
YOU TO THE MAIN WEBPAGE OF THE NATIONAL WEATHER SERVICE IN
PHILADELPHIA AND MT HOLLY. YOU CAN ALSO FIND MORE INFORMATION ON WINTER
WEATHER PREPAREDNESS HERE.


$$