Warm front moving in from the south is unstable and could create supercells.

Severe weather – with large hail, high winds and even tornadoes – is possible again late this afternoon and evening in the metro area and beyond, and residents are advised to keep an eye on conditions.

The National Weather Service says a warm front stretched from north of Wichita to the Lake of the Ozarks at mid-day and was pushing north, expected to reach the Interstate 70 area. The Weather Service says it’s an unstable air mass that, coupled with upper-level winds, could create supercells, the storms that spawn severe thunderstorms and tornadoes.

Forecasters say everyone west of a line from Chillicothe to Warrensburg, including the entire Kansas City area, should monitor conditions between 4 p.m. and 9 p.m. Authorities also advise drivers never to go through flooded roadways.

The areas at risk, including west-central Missouri, northwest Missouri and northeast Kansas, could get thunderstorms that bring damaging wind gusts, tornadoes and “very large hail,” the Weather Service says.

The area already has been pounded by heavy rains Thursday night and this morning. The Lee’s Summit area suffered flooded streets, generally in the Missouri 150 area. A flash flood warning for parts of Jackson County was allowed to expire at 3 p.m., but a flood warning remains in effect until 11 p.m. for the Lake Lotawana and Lone Jack areas. Southern Lafayette County and northern edge of Johnson County remain under a flash flood watch,

The Weather Service reported several instances of heavy rain, including 3.57 inches between 8 p.m. Thursday and 10 this morning in Pleasant Hill, and 4.8 inches since 8 p.m. in Greenwood. Portions of Missouri 291 and Missouri 150 were closed this morning.

National Weather Service, Pleasant Hill: http://www.weather.gov/kc