A lot of areas of shower and storm activity will be around the country through the weekend producing heavy rain and potentially a few severe storms.
First, in the west, a trough of low pressure will produce scattered showers and storms for parts of east-central CA, southeast ID, NV, UT, AZ, CO, WY, NM, and south-central MT. Heavy rain will be the main threat with this activity as there are Flood Watches in effect for a good portion of NV, parts of NM, and parts of east-central CA.
Next in the east with a very warm and moist air mass in place and weak disturbances and boundaries moving through the region, scattered showers and storms are expected through the weekend across much of the eastern third of the country. Heavy rain is expected with some of this activity as well as more Flood Watches are in effect for all of KY, much of WV, southern OH, and southern IN.
Finally, a cold front will bring scattered showers and storms to the Northern and Central Plains, and the Upper Midwest through the weekend. It will begin draped across the Dakotas today and by Monday morning it will be draped from KS to New England. A few severe storms are possible this evening and overnight in NE SD, SE ND, and NW MN, and then further south from SE SD to W WI on Saturday, otherwise, heavy rains are anticipated with some of the stronger storms.