Highs may reach 70 here today, so the Weather Service is activating a rarely used advisory known as a White-out Warning: Motorists should exercise extreme caution, as unusually high temperatures could result in severe, visibility-impairing glare from the out-of-season, pasty white, too-early exposed calves, thighs, backs and bellies of pedestrians and runners. Wear dark sunglasses and do not look directly at skin.