A Saturday Wind Whipping (Through the) Trees
A storm system departing the area will kick up strong winds on Saturday, causing perhaps more damage than we saw duing last Tuesday's severe weather.Posted — Updated
The surface component of this system will be taking shape across our area as it moves northeastward, and the more it develops, the tighter the pressure gradient will be come. That gradient is the difference in atmospheric pressure between two points divided by the distance between those points. The larger or "tighter" the gradient, the faster the winds will blow.
Look at it this way. Imagine that the area of low pressure that will affect us tonight and tomorrow is a valley, and the area of high pressure that will move in behind it is a tall hill. All other things being equal, if the "hill" of high pressure and the "valley" of low pressure are very close together, the side of the hillside inbetween will be very steep. On the other hand, if they are far apart, the hillside will be gently sloped.
Saturday, the high pressure "hill" and low pressure "valley" will be very close together, and the "valley" itself will be getting progressively deeper as the day wears on. Much like a ball released at the top of the hill, the winds will blow very fast to get from the top of the hill to the bottom of the valley.