Thursday, January 24, 2013

CWS Technical Discussion

Technical Discussion

Synopsis…
High pressure will continue into this evening, but will quickly retreat to the southeast as a 500mb short-wave trough surges in from the northwest. A weak and disorganized clipper system will sweep by tomorrow and will gain strength once it reaches the Atlantic. A wide swath of 1-3" of snow is expected by this system. Scattered snow showers will continue into Saturday and temperatures will slowly begin to rise heading towards next week.
Short Term (through Saturday)…
A weak low pressure system currently in the northern plains will quickly move east southeast causing unstable conditions for the Commonwealth on Friday. Clouds will thicken and snow will begin to fall starting from the west around 1 p.m. High temperatures remain chilly only reaching the mid-to-upper teens. The majority of the state is only looking at a QPF of .1-.25 inches. With temperatures in the teens, snow to liquid ratios may exceed 15:1. A total of 1-3" of snow is expected with local amounts up to 4". As the upper-level trough that has been sitting over the eastern United States begins to weaken, temperatures will slowly being to rise into Saturday as highs will peak into the mid-20's. A northwesterly wind will enhance some more lake-effect snow and many of the squalls may scatter throughout the state on Saturday.
Long Term (Sun-Tues)…
High pressure will dominate a large portion of the northeast on Sunday giving way to an abundance of sun. High temperatures will be in the mid-to-upper 20's with some areas hugging 30 degrees Fahrenheit. As Sunday evening approaches, the trough will begin to retreat as a weak ridge moves in from the west. Warm air advection is expected to keep lows on Monday morning to be in the upper-teens, but quickly rise into the 20's. Clouds will begin to increase as a system from the west approaches. The cold air may stick around longer than the models predict, so forecasting this storm may be a little uncertain this far away. Overall, the outcome may lead to mixed precipitation along the lines of wet snow, sleet and freezing rain. High temperatures will sit around the freezing mark of 32 degrees. Warm air advection will continue into Monday night and Tuesday so any mixed precipitation will turn to all rain. High temperatures on Tuesday are expected to be in the mid-40's. 




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