Updated: Feb 18, 2019
We have been advertising a wet weather pattern and here is the main reason why we see the potential for heavy rainfall and even the chance for some wintry weather over the next seven days.
1. A -PNA teleconnection has allowed a trough to establish itself across the western United States for the past few weeks. That has allowed moisture from the tropical Pacific to be pulled northward into the United States. This moisture has impacted the West Coast with several significant weather systems over the past 10 to 14 days. moisture at the mid and upper levels of the atmosphere has transverse day across the country and is now impacting parts of the Eastern United States .
2. A strong sub tropical ridge has been established along the Gulf of Mexico and the Southern tier of the US during the same timeframe, however a shift the ridge axis out into the Southwest Atlantic will allow a strong low level moisture to begin flowing into the US.
3. A series of surface high-pressure systems will move across Southern Canada and the northern tier of the United States during the next week or longer. That will provide enough influence for cold air from the northern latitudes to interact with an active storm track at times.
The end result in all of this will be several active days of weather coming up. Sunshine looks to be at a premium for most of this week. Rainfall will be off and on during the weekend and especially late Tuesday night into the early hours of Wednesday, just enough cold air could move into parts of the Carolinas to deliver some winter weather...all details on the flood/winter impacts can be found in the High Impact Weather Outlook posted here on The Daily Weather Vane.