Summer is making a grand entrance this weekend. The National Weather Service in Topeka has issued a heat advisory for Douglas County from 10 a.m. to 10 p.m. Saturday.

The scorching heat is arriving just ahead of the official first day of summer on Sunday. The Saturday advisory covers most of northeastern Kansas, which is expected to see temperatures from 95 to 100 degrees. The hot temperatures combined with high humidity will cause heat indices to surpass 100 degrees Saturday afternoon.

The hottest time of the day in Lawrence will be between 4 and 6 p.m., said Emily Heller of the National Weather Service in Topeka. The temperature is expected to reach 97 degrees with a heat index of 109 degrees near those times.

The summer solstice on Sunday — the longest day of the year and the official first day of summer — isn’t expected to bring any respite from the heat, with a high of 94 degrees and a heat index of 104, Heller predicted.

The weather service advises:

A heat advisory is issued when high humidities are expected to combine with hot temperatures to make it feel like it is 105 degrees or greater. Persons are advised to avoid prolonged work in the sun…Or in poorly ventilated areas. Also keep plenty of liquids on hand and try to stay in an air conditioned environment. Take extra precautions if you work or spend time outside. When possible…Reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work…The occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency…Call 9 1 1.