Good late Thursday evening to everyone...there is a lot going on in the weather-world and for our area coming up a significant weather system will bring a soaking rainfall.
The feature of interest in the upper levels of the atmosphere is currently on shore the West Coast of the United States. A piece of that energy will begin to break off tonight and cross the Rockies on Friday...
The weather here in the Carolinas on Friday should be fairly tranquil as a fast zonal flow will help push out the moisture that impacted the region on Thursday. After a foggy start, we should see a bit of sunshine with temperatures well up into the 40's, close to average for this time of the year.
Our feature in the Rockies will quickly amplify Friday night and into Saturday helping spawn a vigorous storm system for the Eastern half of the country. Moisture will already be spreading through the Tennessee Valley by Saturday morning and will quickly move east.
Rain showers out ahead of the main storm system could impact the Foothills as early as late Saturday morning, thanks to southwest flow advecting moisture into the region. Rain coverage will increase through the afternoon hours, initially in a scattered nature but picking up in coverage late in the day.
By Saturday evening a well developed line of showers and maybe even a rumble of thunder will progress through the Western Carolinas...note on the back side of this storm, rain changes over to snow in the Tennessee and Lower Ohio Valley Region...
This looks to be a decent rain producer on Saturday as the coverage area may receive on average about 1 inch of rainfall. Of course any locations that pick up on convective elements could see higher amounts. Given how rainfall has been sparse in the past 7-10 days, there should be no issues in regards to flash flooding.
Once the frontal boundary passes through late Saturday night, colder air will rush into the Southern Appalachians. It's still unknown just how quick that cold air can rush into the lower elevations east of the Apps. In the mountains, northwest flow snowfall will be kicking in full force prior to daybreak Sunday...a few inches of snow cannot be ruled out in the high country...the arctic blast will win out by Sunday night as very chilly conditions will move in on gusty northwest winds. We will have more on the cold blast in a later update.