A heat advisory is in effect through tomorrow night for the four states.

According to the National Weather Service, the advisory will run from 1 p.m. until 9 p.m. today and tomorrow for all of eastern Kansas, central and eastern Oklahoma, western Missouri and northern Arkansas.  Parts of Arkansas will be in an excessive heat warning.  The air temperature today in Coffeyville is expected to reach 103, while the heat index could be as high as 107.  Anyone working outside should take frequent breaks and drink plenty of water.