A wide-reaching severe weather threat, from the Midwest to the Gulf Coast, will continue to put millions of people in harm's way into Monday night.
Damaging winds will be the most prevalent threat. This threat will include cities from Des Moines, Iowa, to Louisville, Ky., to Jackson, Miss., Florence, Ala., Nashville, Tenn., and New Orleans.
Some of the most violent thunderstorms are expected to unleash large hail and even tornadoes. There is an elevated risk for strong, violent tornadoes into Monday evening from Mississippi to northwestern Alabama and middle Tennessee.
"Northern Mississippi will be at the greatest risk for tornadoes on Monday," AccuWeather Enterprise Solutions Storm Warning Meteorologist Justin Pullin said.
Life-threatening, destructive weather conditions will continue into Monday night.
The storms will be fast-moving and could be concealed by rain in some cases. People may have very little time to get out of harm's way.
The storms can result in long delays for both air and ground travelers. Air travelers in both St. Louis and Memphis could face the most interruptions in the region. Those traveling across Interstates 70, 64, 55 and 40 can be delayed by blinding downpours and water-covered roadways.
Repeated bouts of torrential downpours can spark flash flooding. If you ever encounter a water-covered roadway, turn around and seek another route.
Damage to power lines could wipe out power to many. Be prepared by storing fresh water and non-perishable food. Make sure fresh batteries are in flashlights and severe weather radios.
Monday's threat has evolved from a powerful storm that spawned violent thunderstorms across the Plains on Sunday and Sunday night.
These storms have developed east of areas hit hardest on Sunday and Sunday night, including those impacted by devastating tornadoes in northern Arkansas. This should help with the cleanup efforts already underway.
The storm will generate powerful winds aloft which will combine with warm and humid air at the surface to generate the violent thunderstorms.
A swarm of dangerous thunderstorms will persist into Monday night from Illinois to Louisiana ahead of a renewed severe weather threat on Tuesday.
"Severe storms will kick off again Tuesday afternoon across portions of the Southeast, especially across Mississippi and Alabama," Pullin said.
Cities that can be impacted on Tuesday will include Tupelo, Miss., Mobile and Birmingham, Ala., Chattanooga, Tenn., and even Atlanta.
A severe thunderstorm risk could linger into Wednesday and Thursday, potentially impacting areas from the mid-Atlantic to the Southeast.
Temperatures will be a few degrees below average across the UK this weekend, but largely dry conditions are expected.
After no rain for almost a month, Santiago braces for rain early in the week. Cool air follows, spreading into Chile, Argentina and Uruguay mid-week.
There is a significant chance that Jimena will turn back toward Hawaii and threaten the islands during the second week of September.
An unusually strong push of cool air for early September will move southward along the Atlantic Seaboard into the Labor Day weekend before July-like heat returns by next week.
Steering winds could take Ignacio, as a remnant storm, into the southeastern arm of Alaska or British Columbia during the middle days of next week.
Strong thunderstorms will roll across the Upper Midwest while rain and strong winds roar through the Northwest this weekend.
Greatest natural disaster for Arizona. Rains in central Arizona caused rivers to rise 5-10 feet per hour, sweeping cars and buildings 30-40 feet downstream. Twenty-three lives were claimed by the floodwaters. This rain came from Tropical Storm Norma.
Los Angeles, CA (1988)
110 degrees -- all-time September record.
Washington, DC (1939)
"Once in a hundred-year rainstorm" 4.40 inches in 2 hours at the Washington Zoo.