***Areas of heavy rainfall for the Southwestern U.S.***
***Late summer heatwave for the Dakotas and Upper Midwest***
***Pleasant weather for the East Coast***
For the beginning of the work week, the region of the country with the
most active weather will be the Desert Southwest and into the Great Basin.
Moisture from the remnants of Tropical Storm Ivo, combined with rich
monsoonal flow from Mexico, will result in scattered to numerous showers and thunderstorms. Moderate to heavy rainfall and localized flooding appear to be the main hazards, and orographically enhanced rainfall can be expected near mountain ranges.
Over the Northern Plains and Upper Midwest, heat will continue making weather headlines. Heat advisories and a few excessive heat warnings are in effect for high temperatures in the mid to upper 90s, and heat indices of 100-110 degrees. Overnight lows in the 70s will also be well above average for late August. This is the result of a building ridge of high pressure aloft.
Elsewhere, a high quality airmass will continue to deliver rather pleasant weather conditions for the Northeast and Mid-Atlantic through Monday, before warmer weather returns on Tuesday. Humidity levels will also be held in check during this time before rising.
Farther south, scattered showers and storms will be possible along the Gulf Coast as a stationary front slowly dissipates over the region.