From the National Weather Service

The National Weather Service is warning that waves of moisture and upper level disturbances interacting with a partly stationary boundary will bring periods of moderate to heavy rainfall to the area today through Thursday night.

Flash flooding also may be in the offing from heavy rainfall associated with a cold front this afternoon through tonight. The weather service says two to three inches of rain could fall and result in minor river flooding late this week continuing into next week.

Expect temperatures to contrast sharply over the next few days.

Strong temperature contrasts will persist across the lower 48 states, the weather service predicts, over the next several days on either side of the arctic front, initially lying along the lee of the Rockies and extending east northeastward from the Southern Plains into the mid-Mississippi Valley, Ohio Valley and mid-Atlantic. Much above average temperatures expected Wednesday and Thursday from the Southern Plains, eastward across areas to the east of the Mississippi River.

At the same time...much below average temperatures expected to the north of the arctic front across the Central to Northern Plains. While the coldest arctic air will be entrenched along and to the east of the Rockies, the remainder of the Western U.S. to the west of the Rockies will experience persistent below average temperatures.