NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1013 AM EDT TUE JUL 17 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). ***


NORTHEAST...
MID ATLANTIC...
SOUTHEAST PIEDMONT...
MIDWEST...

THERE WERE NO SIGNIFICANT INITIALIZATION ERRORS NOTED WITH THE NAM
IN THESE REGIONS.


NORTHERN FRONT RANGE OF COLORADO...

THERE WERE NO SIGNIFICANT INITIALIZATION ERRORS NOTED WITH THE NAM
IN THIS REGIONS.


INTERIOR VALLEYS OF CALIFORNIA...
LOWER COLORADO VALLEY...

THE NAM INITIALIZED SURFACE TEMPERATURES AS MUCH AS 15 DEGREES TOO
COOL NEAR THE MOUNTAINS IN THESE REGIONS...MOST LIKELY DUE TO ITS
TERRAIN RESOLUTION.


CISCO