The Mid-South will get wedged between an upper level trough (or lower pressure) to our east and an upper level ridge (or higher pressure) to our west for most of the work week. This will result in what is called "northwest flow" for the area, in which the upper level flow of air is from northwest to southeast. This pattern is usually quite progressive, resulting in large oscillations in temperatures due to frontal passages and increased precipitation. In this case though, the pattern looks a lot drier, with a shortwave embedded in the flow only able to bring cloud cover (and perhaps a few sprinkles) to Memphis Wednesday into Wednesday night.
|Upper level map showing height anomalies, indicative of ridges and troughs. |
The Mid-South wedged in between the two, resulting in northwest flow.
|Surface temperature anomalies Wednesday morning showing temperatures about 8 degrees below average for the Mid-South.|
These below average temps won't stick around too long though, with a building upper level ridge to our west that will slowly make its way into the Mid-South. We'll start feeling the effects of that ridge by Friday as above average temps settle in for the weekend (high temps in upper 50's and lower 60's).
|Surface temperature anomalies during the day on Saturday. A drastic difference just 3 days after the previous map.|
|The Climate Prediction Center forecasting over a 50% probability |
that we see above average temps from December 14th-18th (early next week).