TONIGHT: Mostly Cloudy. Lo 30.
FRIDAY: Clearing & Blustery. Hi 40. Winds: N 10-20 mph. Gusts to 30 mph.
SATURDAY: Mostly Cloudy, Cold & Brisk. Hi 22. Winds: N 5-15 mph.
SUNDAY: Increasing Clouds, Snow Develops After 5 PM. Winds Strengthen. Hi 30. Winds: E 5-15 mph.
Today brought hazy skies, but also milder conditions. Temperatures topped out in the low 40s making it the mildest day of the week. The clouds will be stubborn this evening, and tonight will also be mostly cloudy with lows around 30°. We do stay dry though even with light radar returns to our west.
Cold air quickly returns tomorrow with winds increasing out of the northwest between 10-20 mph. Highs for Friday will warm near 40° as skies clear with blustery conditions. Those north winds tomorrow will usher in major cold air for the weekend. Temperatures plummet into the lower teens Friday night.
Saturday will certainly be cold. Temperatures will struggle to warm into the 20s on Saturday. There will be more clouds than sun and a bit of a breeze again adding to the chill. The establishment of the cold air plays an important role in the developing Nor’Easter for late Sunday.
While we establish the initial cold air Sunday morning, a low pressure system will track north along the southern Appalachians Sunday afternoon. A secondary and stronger low begins to develop along the coast Sunday evening which is when we begin to see snow develop across the Midstate.
Our timeline shows that snow develops after 5pm Sunday evening. Steady accumulating snow lasts for several hours Sunday evening before warmer air arrives aloft. This will change the snow to rain, mainly south and east of Interstate 81 Sunday night.
Therefore we believe a wide range of snow amounts will occur in our area. Locations in southern York and southern Lancaster have the highest probability of the snow changing to rain which means less total snow for this area. Mifflin and Juniata counties are likely to experience all snow and receive the highest snow totals. This storm will exit near or slightly before daybreak Monday morning with cold and breezy conditions to follow Monday morning and afternoon.
Our weather team expects to continue to fine tune the timing and details of this storm. The toughest call will be when parts of the Midstate changeover to rain, which will ultimately determine snow amounts across our area. Be sure to check back for more updates.
-Meteorologists Eric Finkenbinder and Dan Tomaso