A heat advisory is in effect for Lamar and the Prowers County area from 9 a.m. to 8 p.m. Monday as temperatures soar to a high near 106 under sunny skies. Monday will be sunny, hot, and breezy, with an east-southeast wind of 10 to 20 mph becoming south in the morning. Monday night carries a 30 percent chance of showers and thunderstorms, mainly before 11 p.m., with a low around 64. Winds shift to the north at 20 to 25 mph after midnight behind the front, with gusts as high as 35 mph. Dangerous heat Monday, then a sharp cooldownMonday's high near 106 makes for the hottest day of the week and dangerous conditions for anyone outdoors during the afternoon.