Fox News Weather Center

LIVE: Severe storm outbreak unfolds from Nebraska to Texas; Tornado threat looms

Severe thunderstorms are quickly developing across the south-central U.S. with storms threatening lives and property from Texas to Nebraska.

The area of highest risk spans across much of central Oklahoma and central Kansas, including Oklahoma City, Norman and Tulsa, Oklahoma; Wichita and Salina, Kansas; and Hastings, Nebraska.

"All modes of severe weather are likely, including tornadoes, hail and damaging winds," according to AccuWeather Assistant Director of Storm Warning Services Andrew Gagnon.

Some of the strongest tornadoes during the afternoon and evening may be long-lived, tracking on the ground for an extended period of time before the storm weakens.

Storms are expected to last well into Tuesday night, eventually shifting into Missouri and Arkansas.

UPDATES: (All times are listed in CDT)

3:15 p.m. CDT Tuesday: A severe thunderstorm capable of producing a tornado just crossed the border from Oklahoma into Kansas and is headed toward Wichita, Kansas.

2:33 p.m. CDT Tuesday: Have pictures of today's severe weather? Click on the picture below to submit your photo, but please be safe when taking pictures.

2:29 p.m. CDT Tuesday: Many reports of small hail and wind gusts past 50 mph around St. Louis.

2:00 p.m. CDT Tuesday: All classes, exams and activities at the University of Oklahoma that begin after 4:15 p.m. CDT have been canceled due to the threat of severe weather.

12:00 p.m. CDT Tuesday: Public schools in Oklahoma City are dismissing early due to the threat of severe weather.