Saturday, December 13, 2008

Strong Winds/Winter Storm possible.




A complex situation is setting up in the western part of the bluegrass state. First things first enjoy a dry day with temperatures around 50ish and an increase in winds from the south.

Then as a pressure gradient enters the area tonight. A potential high wind event begins.

Starting tonight as the winds turn south an a low pressure system with an arctic cold front comes along the winds will start to pick up. It isn't going to take a lot to bring those strong winds 5000 to 7000ft to the surface. So sustained winds starting tonight though Sunday will be in the 20 to 29 MPH range with gusts as high as 40 to 49MPH. This will turn a lot of objects loose. Especially objects like loose items on porches and patios, weak tree limbs stressed by the windstorms, severe wx, and ice storms, and the droughts we have had since Summer of 2007. The IKE windstorm really weaken a lot of limbs, and those loose limbs and branches can easily fall. Even Monday and Tuesday wind gusts of 25mph may be possible but the worst is late tonight into Sunday night/very early Monday. There may even be some elevated non-severe thunderstorms around late Sunday night. Then
Then as an arctic cold front with shallow but pretty cold air moves into west KY along with storm system there is potential for rain that could change to freezing rain with maybe a little sleet mixed in along the ohio river.

As the arctic front will cross West KY sometime Monday Morning or towards the midday time frame. The high temps on Monday will be around 47-49 around NW KY and mid 50's in SW KY but those temperatures will be reached in the morning in NW KY and probably late morning/midday in KY/TN border area. In about 3 or 4 hours the temperature will drop about 20-30 degrees. By nightfall the temps. will be near or below freezing across all of West KY and any rain will changeover to freezing rain. There are uncertainties on how much precip. will be there when we go below freezing, but there is consistent model performance on the favorable EURO and NAM models at say there should be enough for some possible significant ice accumulation. The models are pretty consistent but this event is still 48 to 72 hours away. Also models do not handle shallow arctic air well, so placement on where the arctic front will be is key also.

There also the possibility of many shortwaves riding the arctic front which could be anywhere from the West KY parkway to south of Interstate 40. This could cause wintry mix situations Tuesday-Thursday but confidence is quite low.

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