NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1003 AM EDT FRI JUL 06 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 CALIFORNIA VALLEYS AND SOUTHERN NEVADA...

THE 12Z NAM INITIALIZATION DEPICTED A FEW TEMPERATURES
APPROXIMATELY 10-15 DEGREES TOO COOL ACROSS SECTIONS OF THE THE
INTERIOR SOUTHERN CALIFORNIA VALLEYS.  THIS INCLUDES THE LAS VEGAS
METRO REGION.

BANN