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LIVE: Menacing Thunderstorms Ramp Up Across Kansas

The first major severe weather outbreak of the spring season will ramp up with dangerous thunderstorms moving across Kansas, Missouri and Arkansas into Wednesday night.

A swath of thunderstorms will bring the risks of large hail, damaging winds and even some isolated tornadoes to the areas of Missouri and northern Arkansas later in the night.

As of 9 p.m. EDT severe thunderstorms were ramping up through Kansas.

Flash flooding will be another potential problem in the region as the storms fire up Wednesday. Travelers should be prepared for road and air traffic travel delays, flooded roadways and possible vehicle damage from hail.

Areas at risk through Wednesday night include communities in Arkansas, Kansas, and Missouri.

As a part of a multiple-day severe weather event, severe weather will continue through the end of the week, taking aim next on 40 million people from the Gulf Coast to the Ohio Valley.

UPDATES: (All times are listed in EDT)

2:02 a.m. EDT Thursday: A line of thunderstorms are training south of Kansas City, Mo. and west of Columbia, Mo. Many reports of flooding are coming from this area. Radar:

12:50 a.m. EDT Thursday: Torrential downpours created a flash flood in Anderson County, Kansas. Law enforcement reports of several roads with flowing water over them.

10:50 p.m. EDT Wednesday: A hail producing storm is heading towards the western suburbs of Kansas City. A trained spotter reported 1-inch diameter hail in Douglas County earlier form this storm.

10:23 p.m. EDT Wednesday: Car windshields parked near the Kansas Star Casino were busted out by hail measuring 2 inches in diameter, according to a public report.

9:40 p.m. EDT Wednesday: Heavy rain totaling 2.09 inches in Effingham, Ill., according to Mesonet.

9:03 p.m. EDT Wednesday: Golf ball sized hail and hail totaling more than two inches has been reported in Allen County, Kan., according to NWS spotters.

6:55 p.m. EDT Wednesday: Watch this evening's edition of AccuWeather LIVE for the latest on the severe thunderstorms firing up across Kansas:

12:45 p.m. EDT Wednesday: Parts of Homer Adams Parkway Route 3 Underpass are flooded with water flowing underneath the pass in Alton, Ill., reports an NWS spotter.

11:40 a.m. EDT Wednesday: Ping-pong ball-sized hail fell in Waterloo, Ill., according to an NWS spotter.