Synopsis: A very weak short wave is bringing light snow to Pitt Metro, Laurel Highland, and into Ridge and Valley. Everyone else is under mostly cloudy skies. Clearing will occur on Sunday to mostly clear skies. Monday looks to be cold and clear, but clouds will increase Monday night for what will be the show down of the week. A two punch storm that will bring everything and maybe the kitchen sink for Tuesday and Wednesday. The storm moves out Wednesday Night, bring colder and clearer conditions for Thursday.
Short-term: Neither the WRF or GFS show the light snow that is falling over PM/LH/RV this morning. But they do have the clouds associated with it. They both show clearing conditions for the state Sunday afternoon and into Sunday night. Monday will be cold after this short wave passes through but clear. Relative Humidity at 700mb and 850mb levels start to increase Monday night as our two punch storm system purges from the southeast. Overrunning snow will start as our first punch after Midnight on Tuesday.
Long-term: The WRF is the warmer of the three models looked at (WRF, GFS, & EURO) for this storm. The 850 0C temp line during the height of the storm looks to be positioned just above the state. This brings an interesting wintry precipitation. Based on very cold stubborn air prior to the storm, warm air will have a hard time trying to reach the ground. The first batch of snow will end mid day for most of the state. A break in the action around dinner will occur before the more propionate second punch comes in for Tuesday night and Wednesday morning. Along the PA Turnpike and points south they will start off as snow then change over to rain before changing back over to wintry mix Wednesday Morning. North of the PA Turnpike they will see snow before changing over to wintry mix then back to snow for Wednesday Morning. The storm clears out for Wednesday afternoon and night, bringing in colder air. Thursday looks to be cold and clear.
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