Low pressure over Texas will track to the lower Great Lakes by Friday morning, leaving behind it a large area of heavy rainfall across the lower Mississippi River Valley, according to the National Weather Service.
Most of Middle Tennessee has already received rainfall amounts of a quarter to three-quarters of an inch, and an additional half inch to inch of rain can be expected tonight, especially south and west of Nashville.
Flooding is not anticipated, but runoff is expected to cause area creeks and streams to rise and leave the ground nearly saturated for additional rainfall.
A deepening trough over the western U.S. will allow a series of shortwaves to track across the lower Mississippi River and Ohio River Valleys from Saturday night through Tuesday night.
Each of these systems has the potential to bring a few inches of rain to the Mid-South and may lead to flooding of the larger creeks and rivers in Middle Tennessee. Those with interests along area waterways should monitor upcoming forecasts and statements from the National Weather Service through this weekend.
With the rain comes near record warmth on Friday and Saturday then a trend back to colder conditions blowing into the area Sunday.
Southerly winds will bring unseasonably warm weather to Middle Tennessee on Friday and Saturday and produce near record highs.
The forecast high at Nashville Friday is 72 degrees, which would tie the old record set back in 1890. A high of 75 degrees is expected at Nashville Saturday, which would tie the old record of 75, also set back in 1890. The all time record high at Nashville for the month of January is 78 degrees, last set back on January 24, 1972.
Murfreesboro's record highs for Friday and Saturday are 71 and 74 degrees, respectively, both set in 1916.
The average high for this time of year is 48 degrees.
This warm spell will be short lived and is expected to be followed by a general cooling trend over the next few weeks with some very cold Canadian air possibly arriving by late next week or shortly thereafter.
Temperatures over the next few weeks could very well tumble some 30 to 40 degrees, or even more, following this nice warm interlude.
So, don't put away the heavy coats. They'll probably come in handy again soon.