The Great Lakes, Ohio Valley and Northeast will see a large rainmaker slide through on Thursday.
A slow-moving front continues its progression southward from the Northern Tier of the country. Along this front, a low-pressure system will develop and be an impactful rainmaker from the southern Great Lakes, Ohio Valley and into the Northeast and northern Mid-Atlantic. A mixture of steady heavy rainfall and storms will take place with totals up to 3 inches possible. Localized urban flooding could occur as well as a few strong wind gusts in established storms.
On the north side of this front, cooler and drier air will give relief to the Midwest, northern Plains, Great Lakes, and Northeast. This does not necessarily mean that there will be no rain as the rainmaker moves across through the Mid-Atlantic and Northeast. However, the western Great Lakes and Midwest will become increasingly drier, especially as the day goes on.
There will be general thunderstorms farther south in the Southeast, Mid-South, and along the eastern Gulf Coast. These will feature the basic storm hazards of flash flooding, and damaging winds. It's likely these storms will be isolated and not widespread. Many areas will go through the day without seeing rain, while others may see a lot.
Out to the west, the High Plains will see scattered thunderstorms throughout the day and into the early evening. Large hail, and damaging winds will be the main threats.
Portions of the Rockies, Four Corners, Great Basin, and Pacific Northwest will see showers and a few weak storms. A few rumbles of thunder and a couple strong gusts of wind could accompany this activity. Lower elevation locations of the West will likely miss out on this activity and stay on the dry side. The Desert Southwest, lower Great Basin, and Pacific coast are areas that will be dry.
The higher terrain of the Rockies and northern Appalachians will see 50s and 60s for highs. The Great Lakes, Midwest, northern to central Plains, northern Ohio Valley and Mid-Atlantic, and Northeast will be well within pleasant 70s. Eighties are likely in the southern Mid-Atlantic and Ohio Valley, central Plains, West Coast, and Great Basin. Highs in the 90s will be found in the Mid-South, southern Plains, Southeast, Four Corners, and along the Gulf Coast. There may be a few 90s in the interior lower elevation sections of the Pacific Northwest. In the Desert Southwest and parts of the southern Plains, 100s will be common.