More rain and thunderstorms – some heavy – are expected for the next couple of days, and that could lead to flooding in some places.

There’s a 90 percent chance of rain and thunderstorms the rest of today, according to the National Weather Service. An unstable air mass is expected to move back into the region tonight, meaning thunderstorms could form quickly, bringing large hail, damaging winds and torrential rainfall. That’s more likely if the sun breaks through this afternoon, raising temperatures.

The area is under a flash flood watch through Friday evening, and officials stress the need to avoid driving through standing or moving water. Moving water as shallow as six inches can sweep a vehicle away.

Also, flooding warnings remain in effect on parts of the Missouri River, from St. Joseph to Atchison and then again from Sibley downstream to Boonville. At Sibley, the river was reported at 22 feet – flood stage – at mid-day today and is projected to crest at 25.5 feet at mid-day Saturday, then fall below flood stage Monday. Overall, minor flooding is expected.

The river valley becomes wider and deeper at Kansas City, where the Kansas River flows in, and no flood warning is up for the Missouri in the immediate Kansas City area. Flood stage there is 32 feet, and it’s projected to crest at 26 feet late Friday. Also, no flooding on the Little Blue River – controlled by dams – is expected.

The forecast:

• Occasional rain, possibly with a thunderstorm, this afternoon, then picking up after 4 p.m. High near 73, and breezy. The chance of rain is 90 percent. Showers and thunderstorms tonight – a 70 percent chance – mainly after 1 a.m. Some rainfall heavy. Low of 65.

• More rain and thunderstorms – a 70 percent chance – on Friday, and some storms could produce heavy rainfall. One to two inches of rain possible. High of 77. The chance of rain and thundershowers lingers at 40 percent in the evening. Low near 65.

• Mostly sunny for the weekend and Monday. Saturday high of 75, low of 69. Sunday 69/53, Monday 74/60. The next chance of rain comes Tuesday.

National Weather Service, Pleasant Hill: http://www.crh.noaa.gov/eax/