Storms will begin to enter western New Hampshire around 5 p.m., moving east through the evening.
Storms will move into eastern Kansas by the early afternoon, slowly advancing southeastward through the evening, the weather service said.
In the Denver metro area, isolated afternoon and evening showers and thunderstorms are possible as well.
Minor flooding of creeks and streams are possible in areas of heavy rainfall. National meteorologists predict severe weather potential throughout the weekend to be limited to heavy rainfall and multiple rounds of storms.
Temperatures will rise into the 70s across today, reports the National Weather Service.
Tonight, there is a 70 percent chance of precipitation, with storms and showers likely mainly after 1 a.m., according to the weather service. Winds may gust as high as 18 miles per hour.
A cold front will push through the region on Thursday dropping temps into the upper 60s to low 70s with the greatest threat of showers and thunderstorms in west central and southwest Montana. We'll see a mostly sunny sky early.
National Grid reported almost 650 customers in Horicon, Chester, Schroon and North Hudson who lost power as of late afternoon, with restoration expected by early evening.