Update at 2:55 a.m. CDT Sunday:
This blog is no longer live, as the severe threat has ended. Detailed reports of the event can be found below.
Severe thunderstorms brought tornadoes, large hail, flooding downpours and damaging winds to parts of the Plains and the Rockies on Saturday.
Tornadoes were reported in Colorado and Kansas. Building damage was reported in Adams and Weld counties in Colorado. A tornado touched down in Hamilton County, Kansas.
Strong storms moved through the Chicago area Saturday evening, causing ground delays at Chicago O'Hare International Airport and Chicago Midway International Airport. The start of the game between the Chicago Cubs and Pittsburgh Pirates at Wrigley Field was also delayed.
Some of the storms were highly efficient rainmakers, dropping as much as 2.7 inches of rain in 90 minutes in northern Illinois.
Storms also knocked out power for thousands in Illinois, Missouri and the Carolinas, where another series of severe weather occurred on Saturday.
1:19 a.m. CDT Sunday: 1.5 inches of rain fell from two storms, 12 miles NE of Creighton, South Dakota, trained spotter reports.
12:25 a.m. CDT Sunday: 63 mph gust clocked at McCook, Nebraska, according to NWS observation.
11:45 p.m. CDT Saturday: About 5,000 Ameren Missouri customers, most in St. Louis County, are without power, the utility said.
11:07 p.m. CDT Saturday: Flooding with vehicles stranded in water 1 mile west-southwest of Wyoming, Michigan, trained spotter reports.
11:01 p.m. CDT Saturday: More than 4,100 Duke Energy Progress customers in the Carolinas are without service at this time, the utility reported. Almost half of those outages are in the Florence, South Carolina, area.
10:48 p.m. CDT Saturday: 75 mph gust clocked 4 miles west of Goodland, Kansas, reports NWS employee:
10:38 p.m. CDT Saturday: About 325 U.S. flights have been canceled with another 4,800 delayed, FlightStats reports.
10:13 p.m. CDT Saturday: 60 mph gust occurred 5 miles east of Vale, South Dakota, reports fire department.
9:26 p.m. CDT Saturday: Street flooding occurring in Aurora, Illinois, law enforcement reports.
9:16 p.m. CDT Saturday: 0.98 inches of rain fell in one hour at the James River, Ashton, South Dakota, according to Mesonet:
8:27 p.m. CDT Saturday: NWS spotter reports 2.5 inches of rain fell in 35 minutes in Sullivan, Missouri.
7:55 p.m. CDT Saturday: Ameren Missouri reports more than 9,000 outages and Ameren Illinois reports more than 8,500 outages.
7:07 p.m. CDT Saturday: Strong thunderstorm moving into the St. Louis area. It is expected to arrive in downtown St. Louis in 20 to 30 minutes, AccuWeather.com Meteorologist Brian Edwards said.
7:02 p.m. CDT Saturday: Wind gusts up to 52 mph reported in Harvester, Missouri, reports NWS employee.
6:29 p.m. CDT Saturday: Due to thunderstorms in the area, ground stops are in effect at Chicago O'Hare International Airport and Chicago Midway International Airport.
6:27 p.m. CDT Saturday:
6:21 p.m. CDT Saturday:
5:58 p.m. CDT Saturday:
The storms to our west have produced over 750 lightning strikes in the last 15 minutes— NWS Northern Indiana (@NWSIWX) June 21, 2014
5:47 p.m. CDT Saturday:
542 PM CDT: 0.9" of rain at Chicago-O'Hare in 20 minutes! Do not attempt to drive onto any flooded roadways. Turn Around, Don't Drown!— NWS Chicago (@NWSChicago) June 21, 2014
5:43 p.m. CDT Saturday:
The tarp is going on at Wrigley Field so the start of the game will be delayed https://t.co/RxOikYLSCJ— Pittsburgh Pirates (@Pirates) June 21, 2014
5:27 p.m. CDT Saturday: Golf-ball-sized hail near Horace, Kansas, law enforcement reports.
5:14 p.m. CDT Saturday:
5:13 p.m. CDT Saturday: NWS spotter reports 2.7 inches of rain has fallen near Versailles, Illinois, in the last hour and a half.
5:06 p.m. CDT Saturday: Wind gusts up to 70 mph recorded in Hawthorn Woods, Illinois, reports NWS spotter.
4:47 p.m. CDT Saturday:
60 to 70 mph winds reported 6 miles northeast of Java at 415 pm CDT. #sdwx— NWS Aberdeen (@NWSAberdeen) June 21, 2014
4:44 p.m. CDT Saturday Possible tornado headed into the northern suburbs of Chicago, said AccuWeather.com Meteorologist Brian Edwards. Reports of trees down around Round Lake Beach.
3:56 p.m. CDT Saturday: Wind gusts up to 52 mph recorded near Deer Creek, Illinois.
3:47 p.m. CDT Saturday: Golf-ball-sized hail in Astoria, Illinois, reports emergency management.
Snow will swing across parts of the central and northern Plains to the Upper Midwest as November ends and December begins.
As millions head home from their Thanksgiving ventures the weather may cause trouble on the roads and at the airports from the southern Appalachians to the central Rockies on Sunday.
The reprieve from heavy rain across southern India will not last with the threat for flooding downpours set to return for the final days of November.
The first widespread ice storm of the season will slowly diminish over parts of the southern and central Plains, but areas of slippery travel will continue into Sunday morning.
An active storm track across northern Europe will bring more wind and rain across Germany into the new week.
Several days of heavy rain will bring the potential for significant flooding from the southern Plains to the middle Mississippi Valley into early next week.
Tropical Storm Karen brought wind and flooding rains to western Cuba.
Pillar Point, CA (1991)
68-mph winds on the Pacific shore near San Francisco.
Havre, MT (1896)
Minus 51 degrees.