The Winter Storm Watch that was in effect has now been replaced by a Winter Storm Warning in parts of Middle Tennessee. This means that winter storm conditions are imminent and appropriate actions should be taken. The National Weather Service does a great job giving some tips and explaining what to do/get to be prepared. Visit http://www.srh.noaa.gov/ohx/?n=safety-winter for more info.
This image was taken as of 4:00 PM CST.
Northern portions of the mid state are expected to have up to 4 inches of snow, with lower portions having snow/sleet/ice all by the end of Friday. Saturday accumulations could add an inch or two more to snowfall totals. The NAM forecast shows a possibility for up to 6 inches of snow, but I do not know what factors contribute to the model. So I cannot say that this will be the outcome. Models are supposed to be used with other information and the forecaster’s knowledge, and I don’t have that much… that is why there are the people at the NWS who do this for a living. 
Lastly, here is the winter storm warning text from the National Weather Service.
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE NASHVILLE TN
336 PM CST THU JAN 28 2010
...WINTER STORM WARNING FOR NORTH MIDDLE TENNESSEE FRIDAY AND
FRIDAY NIGHT...
.A LOW PRESSURE SYSTEM PASSING TO OUR SOUTH WILL BEGIN SPREADING
PRECIPITATION ACROSS NORTH MIDDLE TENNESSEE EARLY FRIDAY MORNING.
SNOW...SLEET..AND FREEZING RAIN WILL DEVELOP ACROSS THE AREA...
WITH 3 TO 8 INCHES POSSIBLE FRIDAY THROUGH FRIDAY NIGHT NORTH...
1 TO 3 SOUTH. ADDITIONALLY ONE-QUARTER TO ONE-HALF INCH OF ICE IS
LIKELY.
TNZ005>011-022>034-057-059-062>066-291000-
/O.UPG.KOHX.WS.A.0002.100129T1200Z-100130T1200Z/
/O.NEW.KOHX.WS.W.0001.100129T1200Z-100130T1200Z/
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON-
HOUSTON-HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-
SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-HICKMAN-WILLIAMSON-
RUTHERFORD-CANNON-DEKALB-WHITE-CUMBERLAND-
INCLUDING THE CITIES OF...DOVER...CLARKSVILLE...SPRINGFIELD...
GALLATIN...LAFAYETTE...CELINA...BYRDSTOWN...CAMDEN...ERIN...
WAVERLY...DICKSON...ASHLAND CITY...KINGSTON SPRINGS...NASHVILLE...
LEBANON...MOUNT JULIET...HARTSVILLE...CARTHAGE...GAINESBORO...
COOKEVILLE...LIVINGSTON...JAMESTOWN...ALLARDT...CENTERVILLE...
FRANKLIN...BRENTWOOD...MURFREESBORO...WOODBURY...SMITHVILLE...
SPARTA...CROSSVILLE...FAIRFIELD GLADE
336 PM CST THU JAN 28 2010
...WINTER STORM WARNING IN EFFECT FROM 6 AM FRIDAY TO 6 AM CST
SATURDAY...
* MAIN IMPACT: ON FRIDAY...1-4 INCHES OF SNOW. ONE-QUARTER TO ONE-
HALF INCH OF ICE.
* FRIDAY NIGHT...2-4 ADDITIONAL INCHES OF SNOW. ONE-QUARTER INCH
OF ICE.
* OTHER IMPACTS: ROADS AND BRIDGES WILL BECOME SLIPPERY AND
DANGEROUS FOR DRIVING. GUSTY WINDS MAY CAUSE DRIFTING SNOW...
AND WIND CHILLS FRIDAY NIGHT WILL DROP INTO THE TEENS AND SINGLE
DIGITS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...
SLEET...AND ICE ARE EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO
POSSIBLE. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.
&&
$$
