WENATCHEE — An "excessive heat watch" is in effect this week as temperatures are expected to rise to about 104 degrees before cooling on Friday.

Heat waves from California and Arizona are expected to move north and the Wenatchee Valley will experience higher temperatures up until Friday, according to National Weather Service Meteorologist Robin Fox.

It should hit 98 degrees today, and Wednesday will have a high of 102. “It’ll be about three to five degrees hotter each day,” Fox said. It will get hotter toward the end of Wednesday going into Thursday with the highest temperature of the week reaching 104 degrees Thursday, according to Fox.

“Hydrate and stay out of the heat,” Fox said. “Take appropriate rest times and take it easy when it’s hot.”

Temperatures will drop back down to the 90s on Friday as a cold front from the west moves in, Fox said. With the cold front, there is also the potential for thunderstorms Friday and Saturday, mostly in the mountains.

There will be an increase of winds in the Wenatchee Valley Friday through Saturday, which could affect wildfires, Fox said.

“We could see more smoke plumes, which could spread throughout the area,” Fox said, adding that the air quality of the valley could decrease until temperatures drop on Friday.

High temperatures are expected to drop down into the 80s on Saturday, Fox said.