Winter Weather Update- Philly Weekend Weather Forecast

10PM Update:  Latest NAM shows QPF values back up to 0.15 inches water.   The atmosphere warms a bit in the upper levels towards evening.  Here are the latest changes:  Light snow starts in the afternoon, mixes with sleet and possibly some freezing rain after 6pm and ends during the evening.  Accumulations less than an inch. Temperatures fall below freezing later Saturday night.

Today’s NAM has really backed off from the higher QPF values showing yesterday and this afternoon’s 1 PM model run (18z) has the QPF down to 0.06 inches water.  This falls into the category of a dusting or coating and at this low QPF level, this sometimes can translate into a complete zero.   The GFS has been in a similar range of QPF values.

The NAM has any precipitation occurring during the afternoon and early evening.

So this “snow event” (to use the TV people’s jargon) is looking like it’s not worth talking about.

The next data (NAM) becomes available after 9 PM and the NAM FOUS (Forecast OUtput Statistics)  about 9:40.   I’ll update only if there’s a significant change.

Saturday looks to be cold and cloudy with some light snow coating possible, per the discussion above, in the afternoon.  Light snow , sleet and freezing rain into the evening.  Highs about 32-33.

Sunday will be mostly sunny and milder.  Highs about 45.