Observer staff

The hazy, hot conditions the Grande Ronde Valley is experiencing are expected to persist for another three days, according to the National Weather Service office in Pendleton.

Fortunately relief is in sight.

Starting Saturday evening, the high pressure system, which has been keeping smoke from wildfires in British Columbia and throughout Oregon trapped in the Grande Ronde Valley since Aug. 2, is expected to let up. It will start shifting east either Saturuday afternoon or evening, allowing a low pressure system to move into the area, according to Rob Brooks, a meteorologist with the National Weather Service in Pendleton.

The low pressure system will bring in moister air, and with it, the possibility of thunderstorms. Brooks said there is a 20 percent chance of thunderstorms Saturday night in the Grande Ronde Valley. Sunday's forecast calls for rain showers and cooler weather with a high of 84 degrees and a low 54 degrees. Monday's forecast calls for a high of 82 degrees and a low of 51.

"It will be a pleasant change,'' Brooks said,

La Grande has had a high of at least 90 degrees each day since July 23, a streak of 18 days. The streak should reach 21 for the National Weather Service is forecasting that La Grande will have high temperatures of 96 degrees Thursday , 97 on Friday and 92 on Saturday before the low pressure system moves in.