NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1002 AM EDT FRI JUL 27 2012


*** 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). ***


...INTERIOR VALLEYS OF CALIFORNIA...
...SOUTHERN NEVADA AND ARIZONA...

THE NAM INITIALIZES TEMPERATURES 5-10 F LOWER THAN OBSERVED
NUMBERS OVER MOST OF THE REGION. 


...NORTHERN UTAH...
...CENTRAL IDAHO...

NO SIGNIFICANT INITIALIZATION ERRORS ARE NOTED. 


...CENTRAL ROCKIES/HIGH PLAINS...

NO SIGNIFICANT INITIALIZATION ERRORS ARE NOTED.


...CENTRAL PLAINS...
...SOUTHEASTERN TEXAS...

NO SIGNIFICANT INITIALIZATION ERRORS ARE NOTED.


...MID ATLANTIC...
...OHIO RIVER VALLEY...
...NORTHERN GEORGIA...

NO SIGNIFICANT INITIALIZATION ERRORS ARE NOTED.


MUSHER