First alert that will take effect later on today. What does that mean . We want to make sure youre prepared for wintry mix coming towards us. Krystal klei, fill us in. This first alert starts this afternoon and overnight through monday. Thats a look at dangerous conditions possible especially north and west of philadelphia. But you look at your radar and slight and might think the snow is already here. Not necessarily. What were looking at, falling through west and central parts of pennsylvania but not necessarily moving through maryland and into our viewing zone. Why this happens . Sometimes radar, because its that beam that shoots up into the sky, further it is from the location point, the higher up in the sky its taking that reading. You may see snow high above you but it doesnt it to the ground meaning your return on radar is a little deceitful. Lets take a look, im zooming in on delaware. You can see snow. I just checked an update in wilmington and its pot reporting snow at the su