In the attached photo you will see the Weather Prediction Center's (National Weather Service) outlook for the next next seven days of precipitation.
As you can see, the Pacific Northwest, the Gulf Coast, and the North-East will see the majority of the precipitation during the next week, while much of the Central Plains and the Inter-mountain West see very little. Why?
Right now, the jet stream is ridging over the western half of the United States. This works very much like a speed-bump that significantly weakens any storms that encounter it. The Pacific Northwest is very active right now as Low Pressure prevails offshore. Once these storms make landfall, however, they tend to run into the ridge of the jet stream and don't have much energy to continue progressing inland. Most of these storms have been producing rainfall, with snowfall above about 3000 feet in elevation, and freezing rain in inland valleys.
Meanwhile, it's not uncommon to see storms dropping out of Canada on the lee side of the Rocky Mountains and gaining strength after progressing into the Midwest and tapping into Gulf of Mexico and Atlantic moisture. In the next week, it looks like the heaviest precipitation to the the north-eastern section of the nation will be largely due to Lake-Effect Snow on the eastern shores of the Great Lakes. This happens when frigid, moist air blows over the warmer lake waters and induces strong snow showers due to instability.
Lastly, the Gulf Coast looks to get some heavy precipitation. This is due to slight perturbations in the overall pattern. As cold air from the north overruns the warm, nearly tropical air near the Gulf Coast, showers can form and produce heavy rainfall at times, In this case, multiple cold fronts are expected to push into the Gulf of Mexico, adding to this "overrunning" situation.
Although it's a way's out, I don't see a whole lot of change in the next 14 days....
Dan Schreiber is an operational meteorologist, with experience