Good morning. Today is Saturday, April 21, 2018. I’m Valikia Newsome, and here are your local headlines from TribLIVE Pittsburgh. Expect mostly sunny skies today with a high near 57. Tonight will be mostly cloudy with a low of 38. Our top story is: An employee of UPMC Presbyterian’s emergency department may have exposed about 4,700 patients and staff to tuberculosis, said UPMC on Friday.