From the National Weather Service

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
423 AM EST WED MAR 6 2013

PAZ060-061-103-105-062100-
/O.EXT.KPHI.WW.Y.0014.130306T1200Z-130307T1100Z/
BERKS-LEHIGH-WESTERN MONTGOMERY-UPPER BUCKS-
INCLUDING THE CITIES OF...READING...ALLENTOWN...COLLEGEVILLE...
POTTSTOWN...CHALFONT...PERKASIE
423 AM EST WED MAR 6 2013

...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 7 AM THIS MORNING
TO 6 AM EST THURSDAY...

* LOCATIONS...THE FAR NORTHWEST PHILADELPHIA SUBURBS...BERKS
  COUNTY AND THE WESTERN LEHIGH VALLEY.

* HAZARD TYPES...SNOW.

* ACCUMULATIONS...SNOW ACCUMULATION OF 2 TO 4 INCHES.

* TIMING...SNOW IS EXPECTED THROUGH THE DAY AND WILL START
  TAPERING OFF THIS EVENING AND END TONIGHT.

* IMPACTS...EXPECT SLUSHY TRAVELING CONDITIONS WITH THIS EVENINGS
  COMMUTE. GREATER IMPACTS WILL OCCUR ON SMALLER ROADWAYS. SNOW
  COULD ARRIVE IN TIME TO IMPACT THIS MORNINGS COMMUTE TOO.
  ISOLATED POWER OUTAGES ARE POSSIBLE.

* WINDS...NORTH 10 TO 20 MPH WITH GUSTS UP TO 35 MPH.

* TEMPERATURES...IN THE MID 30S.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE
TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED
VISIBILITIES...AND USE CAUTION WHILE DRIVING.