(Gresham, OR)  --  Gresham police are asking for help to find a 50-year-old woman who hasn't been heard from by her family or friends for the last two weeks.  Investigators say Elissa Twombly, also known as "Lisa," is described as white, five-feet-seven, 150 pounds, with brown hair and brown eyes.  Twombly's family says it's unusual to not hear from her this long.  Anyone who knows Lisa Twombly's location is asked to call 503-618-2233.