NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1024 AM EDT THU JUN 07 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). ***


...SOUTHERN CALIFORNIA...

NAM SURFACE TEMPERATURES WERE INITIALIZED ABOUT 5 TO 10 DEGREES
TOO COLD IN THE VICINITY OF THE ANTELOPE VALLEY OF SOUTHERN CA. 
IN GENERAL..THE INITIALIZED WIND FIELDS WERE ALSO TOO WEAK OVER
THE INTERIOR VALLEYS OF SOUTHERN CA BY ABOUT 10 KTS THOUGH THE
WIND DIRECTION AGREED WITH OBSERVATIONS.

...NORTH CENTRAL TEXAS...

THE NAM APPEARS MISPLACED WITH THE EXTENT AND INTENSITY OF SHOWERS
CURRENTLY BEING OBSERVED OVER THE SOUTHERN PLAINS.

KORTY