NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1005 AM EDT WED AUG 03 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). ***

...SOUTHERN CALIFORNIA...

SURFACE TEMPERATURES ARE 5 TO 10 DEGREES WARMER THAN INITIALIZED
IN THE VALLEYS AND DESERTS EAST AND SOUTHEAST OF LOS ANGELES.

...TENNESSEE RIVER VALLEY...

A LINE OF THUNDERSTORMS OVER NORTHERN KENTUCKY IS MOVING FASTER
AND STRONGER THAN INITIALIZED AND INCLUDES THICKER AND GREATER
CLOUD COVER.

JAMES