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.
Showers will work back into the Harrisburg area on Monday before a turn to turn to dry and milder weather by midweek.
The weekend will end on a dry note around Philadelphia before showers once again return on Monday.
Showers will work back into the New York City area on Monday before a turn to a dry and seasonable midweek.
The weather threatens to interfere with search, rescue and cleanup operations in the wake of the major 7.8-magnitude earthquake that has killed at least 2,000 people with the death toll mounting.
Temperatures will have their ups and downs across the Northeast this week, starting off on a cool note before milder air moves in for the middle of the week.
Throughout the planet’s 4.5-billion-year history, the Earth has undergone amazing and dramatic changes. Even today, the planet is in a constant state of flux.
Binghamton, NY (1993)
0.6" of snow.
Huntsville, AL (1834)
Severe frost highlighted "backward spring" in the South.
Norfolk, VA (1888)
Latest killing freeze: 34 degrees officially in Norfolk, but lower in outlying sections.