***Areas of heavy rainfall for the Southwestern U.S.***
***Late summer heatwave for the Dakotas and Upper Midwest***
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.