Tropical Storm Dolly will bring the risk of flooding to northeastern Mexico at midweek.
Showers and thunderstorms will return to the Southwest late this week and could reach part of California.
A cold front swinging into the Northeast will bring the threat of severe weather to part of the region on Tuesday afternoon.
The southwest Gulf of Mexico has given birth to the Atlantic basin's fourth tropical storm of the season and will send torrential rain into northern Mexico.
Flooding is a concern across southwest Mexico through midweek as Norbert moves just offshore.
The Alaskan wood frog, which freezes itself during the harsh winter months, can remain in an extreme frozen state far longer than researchers originally thought.
Watch a video from inside of a tornado that touched down near Bashkortostan, Russia, on August 29.
An area of low pressure will bring a threat of heavy rain and flooding to parts of southern Europe through the middle of the week.
The late-season swelter will continue along much of the Atlantic Seaboard through the week as tens of millions head back to school and work.
A second volcanic eruption occurred on Sunday morning in Iceland in the same area that had one on Friday.
While temperatures and humidity levels will fluctuate from day to day this week, unseasonable warmth will continue into next weekend around New York City.
Mecca, CA (1950)
126 degrees - highest ever for U.S. in Sept.
East Coast (1775)
Matecumbe Key, FL (1935)
Labor Day Hurricane hit Florida. Pressure at Matecumbe Key dipped to 26.35"/892.3 mb. Most intense hurricane ever to hit the U.S. with 200-mph wind. Tide of 15 feet; 408 dead.