NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1002 AM EDT TUE JUL 12 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). ***


...COASTAL CONNECTICUT...
...MID ATLANTIC STATES...
...SOUTHEAST PIEDMONT...
...SOUTHERN APPALACHIANS...

NO SIGNIFICANT INITIALIZATION ERRORS WERE NOTED.


...SOUTH SHORE OF LAKE ERIE...
...OHIO VALLEY...
...CENTRAL MISSISSIPPI VALLEY...

NO SIGNIFICANT INITIALIZATION ERRORS WERE NOTED.


...INTERIOR VALLEYS OF SOUTHERN CALIFORNIA...

THE NAM INITIALIZED AS MUCH AS 10 TO 15 DEGREES TOO COOL NEAR THE
MOUNTAINS...A RESULT OF THE RELATIVE COARSENESS OF ITS TERRAIN
RESOLUTION.  OTHERWISE...NO SIGNIFICANT INITIALIZATION ERRORS WERE
NOTED.


CISCO