As mentioned in my post yesterday, there’s much uncertainty with all aspects of the storm that is expected to develop Saturday evening.    Much of the details won’t be resolved until the immediate 24 hours preceding the event. Here’s what we know now-

• It’s a fast mover.  Over in about 7 hours.
• Precipitation starts during the late afternoon or early evening Saturday and ends well before daybreak on Sunday.
• Temperatures appear marginal for snow in the immediate PHL area and immediate western suburbs.  The NAM which showed snow likely for PHL has flipped to a warmer scenario and is now favoring rain or rain maybe with sleet.
• Temperatures on Sunday, with sunshine, will melt much of whatever falls, if it falls as snow.  There’s no post-storm freeze.

So, anyone thinking this will be “February-style big snowstorm” is likely to be disappointed.