Changes across much of the United States with a trend for conditions to turn more changeable from the west as Pacific weather systems move in before colder air moves down from the north in the wake of a low pressure system later in the week and into the weekend.
Starting off with the Northeast for today and a more unsettled outlook is now developing with showers and thunderstorms expected to develop today across southern New York and northern Pennsylvania before moving into parts of southern New England.. Elsewhere it should stay dry during today. Temperatures will widely make the 70's, but it will be cooler across eastern new York and New England.
For the South it is set to be a dry and warm day on Tuesday in many areas, but a few heavy showers or thunderstorms will break out over the Florida Peninsula, southern Louisiana and coastal Texas. Temperatures will be in the 80's or low 90's for much of the region.
Into the Midwest and an active front will bring some potentially severe weather in places today. Showers and thunderstorms are likely to break out in areas from Minnesota to northern Oklahoma, whilst thundery showers will also affect northeast Kansas and northern Missouri. As we head into this afternoon some severe storms are possible from western Iowa to southern Kansa where damaging winds, hail and isolated tornadoes are possible. Maximum temperatures will widely be in the 70's and 80's in most areas, but as that colder air arrives highs in the 50's at best are likely in the north.
Finally the West and whilst many parts will be fine and dry today, some showers are likely over parts of Wyoming, Colorado and northeast Utah, these falling as snow over the mountains. Temperatures will be below normal for many, ranging from the 50's in the northwest to the 80's over California and the Desert Southwest.