* WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the upper 90s to 105 with very warm nights with low temperatures in the lower to mid 70s expected. For the Wind Advisory, east winds 15 to 25 mph with gusts to 45 mph expected. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...For the Extreme Heat Warning, from 10 AM this morning to 8 PM PDT Thursday. For the Wind Advisory, from 6 AM to 6 PM PDT Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Heat related illnesses increase significantly during extreme heat events.