NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
953 AM EDT WED JUL 13 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). ***


...MID ATLANTIC STATES...
...SOUTHEAST PIEDMONT...
...SOUTHERN APPALACHIANS...
...TENNESSEE VALLEY...

THE NAM DOES NOT APPEAR TO HAVE PROPERLY RESOLVED THE LINE OF
SHOWERS SINKING THROUGH EASTERN PENNSYLVANIA AND NEW JERSEY THIS
MORNING.  OTHERWISE...NO SIGNIFICANT INITIALIZATION ERRORS WERE
NOTED OVER THESE REGIONS.


...LOWER COLORADO VALLEY...

THE NAM INITIALIZED AS MUCH AS 15 DEGREES TOO COOL NEAR THE
MOUNTAINS...DUE TO COARSE TERRAIN RESOLUTION.  OTHERWISE...NO
SIGNIFICANT INITIALIZATION ERRORS WERE NOTED OVER THIS REGION.


CISCO