FIRST ALERT: Tracking patchy frost for Friday AM, then heavy rain & strong storms Saturday WIS (Source: WIS) By Dominic Brown | April 22, 2021 at 6:07 PM EDT - Updated April 22 at 7:27 PM COLUMBIA, S.C. (WIS) - Weâre tracking more changes in your First Alert Forecast. WIS (Source: WIS) First Alert Weather Headlines: · Tonight is a First Alert. Areas of patchy frost is possible late as low temperatures drop into the mid to upper 30s. · Friday morning is a First Alert. It will be cold enough for patchy frost in the Midlands. A Frost Advisory is posted from 4AM - 9AM. · By Friday afternoon, highs will rebound into the 70s under partly to mostly cloudy skies.