RIVERSIDE (CNS) - Widespread rain showers are in the forecast for the Inland Empire tomorrow, but the wet weather will make a fast exit, followed by a warming trend and possibly a Santa Ana wind event going into next week.According to the National Weather Service, a trough of low pressure dragging across Southern California will usher in light to moderate downpours during the predawn hours Friday, likely lasting until early afternoon."Overall, we are maintaining general rainfall totals between one-fourth and a half-inch, with local amounts around one-inch in the mountains, and the bulk of that between 5 a.m. and 11 a.m. Friday,'' the NWS stated."Hourly rainfall could be up to around .15 inches.''For western Riverside County, the chances of precipitation are up to 70%, with