NAM AIR QUALITY DIAGNOSTIC DISCUSSION NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD 959 AM EDT FRI JUL 15 2011 *** The following information pertains to initialization errors noted on the 12Z NAM that may negatively impact the performance of the 12Z CMAQ output as used for air quality forecasting. Specifically, errors that apply to temperature, winds, relative humidity and precipitation are included. This discussion only applies to geographical regions of the CONUS where air quality is currently forecast to be degraded (i.e. CODES: YELLOW/ORANGE/RED/PURPLE/MAROON). *** ...NORTHERN MID ATLANTIC STATES... ...SOUTHERN GREAT LAKES... ...TENNESSEE VALLEY... NO SIGNIFICANT INITIALIZATION ERRORS WERE NOTED WITH THE NAM ACROSS THESE REGIONS. ...NORTHEAST OKLAHOMA... NO SIGNIFICANT INITIALIZATION ERRORS WERE NOTED WITH THE NAM IN THIS REGION. CISCO