Code Yellow PM2.5 levels were observed for the majority of the nation today; across many communities in Pacific Northwest/Southwest, Great Lakes, Southeast, Mid-Atlantic and Northeast (top left). Continuing on the reoccurring theme, the worst PM2.5 conditions, Code Orange, Unhealthy for Sensitive Groups PM2.5 levels were observed in southern California. The Hazard Mapping Smoke Analysis team at NOAA indicates a concentrated region of fires across the Southern Plain states, including a plume of smoke in Arkansas (top right). Surface level pollutants in these areas did not appear to be impacted today, and the MODIS overpass aboard the Terra satellite showed little indication elevated aerosol optical depth values near fires (bottom left). Finally, as the jet stream returns to a more zonal position, and temperature rebound across the Mid-West, Southeast, and along the eastern seaboard, today's "true color" imagery from the Terra satellite provides a remarkable image of what's left after the prolonged period of heavy snowfall and frigid temperatures along the Appalachian Mountains (bottom right).