Here's something you don't see everyday.
KEWR 051451Z 35010KT 1/2SM R04R/4500VP6000FT TSSN FG BKN003CB OVC008 01/M01 A2966 RMK AO2 TSB25RAB1352E47SNB25 SLP043 OCNL LTGICCC S TS S MOV E P0013 60013 T00111006 55003=
Basically, it's saying they had 1/2 mile visibility in a Thunderstorm, with moderate snow, aka Thundersnow. Not the rarest of occurances, but definitely unusual, and it is April after all. All kicked off by a pretty strong vorticity max which dropped at least a half foot of snow in the Poconos this morning before making its way over to Newark.
This led to the EWR diversion wave to come over here at ABE:
(BTA is ExpressJet/Continental Express)
BTA2303 from BWI (ERJ-145)
BTA2700 from LIT (ERJ-145XR)
BTA3206 from MSY (ERJ-145XR)
BTA2950 from RDU (ERJ-145)
BTA2346 from PIT (ERJ-145 - Hey, too bad we don't always have ERJ's ABE-PIT!)