NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1037 AM EDT FRI JUN 01 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). ***


...SOUTHEAST TEXAS...

NO SIGNIFICANT INITIALIZATION ERRORS WERE NOTED.


...ARIZONA/NEW MEXICO...

SURFACE TEMPERATURES WERE AS MUCH AS 10 DEG F WARMER THAN
INITIALIZED ACROSS MUCH OF CENTRAL AND SOUTHERN NEW MEXICO.
SURFACE TEMPERATURES WERE AS MUCH AS 10 TO 15 DEG F WARMER THAN
INITIALIZED ACROSS THE DESERTS OF CENTRAL AND SOUTHERN ARIZONA.


...SACREMENTO VALLEY DOWN INTO THE LOS ANGELES BASIN...

SURFACE TEMPERATURES WERE AS MUCH AS 15 DEG F WARMER THAN
INITIALIZED OVER THE INTERIOR DESERTS OF SOUTHERN CALIFORNIA.
SURFACE WINDS WEER NOTED TO BE ABOUT 10 KTS STRONGER THAN
INITIALIZED OVER THE SOUTHERN PORTIONS OF THE SACREMENTO VALLEY.


ORRISON