* WHAT...Hot temperatures of 90 to 95 degrees expected with low temperatures around 60 to 67 degrees. * WHERE...Siskiyou Mountains and Southern Oregon Cascades south of Crater Lake. This includes Lake of the Woods, Howard Prairie and Mt Ashland. * WHEN...From 11 AM this morning to 11 PM PDT Thursday. * IMPACTS...Hot temperatures will lead to a moderate risk of heat illnesses, especially for those without adequate cooling methods.