A very stong high pressure system will develop across the west during the later half of the week. Daytime temperatures will be much above normal with daily records likely in some locations. Temperatures may approach all-time record levels. An excessive heat warning will likely be required for some of the lower elevations in Northern Arizona.

From www.ready.gov:

To prepare for extreme heat, you should:

•To begin preparing, you should build an emergency kit and make a family communications plan. •Install window air conditioners snugly; insulate if necessary. •Check air-conditioning ducts for proper insulation.

Install temporary window reflectors (for use between windows and drapes), such as aluminum foil-covered cardboard, to reflect heat back outside. •Weather-strip doors and sills to keep cool air in. •Cover windows that receive morning or afternoon sun with drapes, shades, awnings, or louvers. (Outdoor awnings or louvers can reduce the heat that enters a home by up to 80 percent.) •Keep storm windows up all year. •Listen to local weather forecasts and stay aware of upcoming temperature changes. •Know those in your neighborhood who are elderly, young, sick or overweight. They are more likely to become victims of excessive heat and may need help.

Be sure to drink plenty of water and avoid over exertion during the hottest portion of the day.