Area forecast discussion National Weather Service Nashville Tennessee 326 PM CDT Thursday may 23 2013 Discussion... a few showers popped up at middle afternoon over north and northeast parts of middle Tennessee as 500 mb trough rotates through the Ohio Valley. These should remain isolated through the rest of the afternoon and end this evening with loss of daytime heating and as the trough moves to our east. West and northwest winds behind a cold front that was moving through the middle state this afternoon will become more northerly overnight and stay up enough to prevent fog from developing Friday morning. Fair but cooler weather is in store Friday as trough moves slowly toward the East Coast...leaving northwesterly flow aloft across our region. It will be surprisingly cold Friday night as surface ridge settles in across the area and skies remain clear. In fact...low to middle 40s will be common for Saturday morning/S min temperatures but a few areas may drop into the upper 30s. The average low temperature this time of year should be in the 55 to 60 degree range. It will be dry Saturday and daytime temperatures will increase a little bit...but a better warmup will commence on Sunday as the 500 mb low moves further up the East Coast and ridging builds across the Tennessee/Ohio valleys. However...decided to insert 20 to 30 probability of precipitation Sunday and Monday as a warm front may get hung up in the region for a couple days. Temperatures will climb well into the 80s Tuesday/Wed/thur as the warm front moves well north of the area and 500 mb ridging intensifies. There could be an isolated thunderstorm or two during middle week but chances are too low to mention in the forecast. && Preliminary point temps/pops... Nashville 52 70 47 76 / 10 0 0 05 Clarksville 47 68 44 77 / 10 05 0 05 Crossville 50 65 40 72 / 20 0 0 0 Columbia 53 71 47 77 / 10 0 0 05 Lawrenceburg 53 72 47 78 / 10 05 0 05 Waverly 49 70 45 77 / 10 05 0 05 && Ohx watches/warnings/advisories... none. && $$ 49