AVIATION...SHOWERS WILL EVENTUALLY SPREAD NORTHWARD AND IMPACT ALL TERMINALS BY THIS EVENING WITH PERIODS OF MVFR OR LIFR CEILINGS AND VISIBILITIES AS THE SHOWERS MOVE ACROSS THE TERMINALS. LOOK FOR WIDESPREAD DEVELOPMENT OF MVFR AND LIFR CEILINGS AND VISIBILITIES TONIGHT...ESPECIALLY IN THOSE AREAS THAT RECEIVE SIGNIFICANT RAINFALL TODAY.