NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1020 AM EDT FRI AUG 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). ***


...INTERIOR VALLEYS OF CALIFORNIA...

THE NAM INITIALIZED AS MUCH AS 10-15 DEGREES TOO COOL NEAR THE
MOUNTAINS...AS A RESULT OF TERRAIN RESOLUTION.


...OHIO VALLEY...
...EASTERN MID ATLANTIC STATES...
...SOUTHERN APPALACHIANS...

THERE WERE NO SIGNIFICANT MODEL INITIALIZATION ERRORS ACROSS THESE
REGIONS.


NO SIGNIFICANT MODEL INITIALIZATION ERRORS WERE NOTED OVER THESE
REGIONS.


CISCO