The National Weather Service modified its previous Excessive Heat Warning to a Heat Advisory that is in effect for many parts of Siskiyou County through 11 p.m. Monday.

High pressure is expected to strengthen over the region Friday and temperatures will warm to 20 to 25 degrees above normal for this time of year, according to NWS.

The hot temperatures, into the triple digits in some places, are expected to continue through at least the Labor Day holiday.

Relief, even at night, will be limited, as lows are expected to be in the mid 60s to lower 70s for much of the area.

While smoke from area wildfires will keep temperatures slightly less hot than they might otherwise be, NWS says it will also pose a health problem for those seeking relief by opening windows or attempting any outdoor activities.

The Heat Advisory includes the cities of Yreka, Weed, Mount Shasta, Dunsmuir, McCloud – the Klamath, Shasta, and Sacramento Valleys of central Siskiyou County.

A map of the Heat Advisory area can be seen at: https://www.wrh.noaa.gov/mfr/HAZARD

Impacts: Very warm temperatures and somewhat limited relief overnight will increase chances for heat related illness, especially for sensitive groups and people without access to air conditioning. Heat stress is also possible for livestock and outdoors pets.

Precautionary/preparedness actions suggested by NWS:

• A Heat Advisory means that a period of hot temperatures is expected.

• These hot temperatures may create a situation in which heat illnesses are possible.

• Drink plenty of fluids, and limit time spent in the heat and in the sun.

• Check up on relatives and neighbors, as well as outdoor pets and livestock.

• Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes.

For updates on area wildfires see: https://inciweb.nwcg.gov/

For updates on smoke conditions see: https://wildlandfiresmoke.net/outlooks/2017/NWCaliforniaFires#Overview