NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1026 AM EDT TUE AUG 02 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 DESERTS NORTHWEST OF SAN DIEGO.

...WISCONSIN...

PRECIPITATION IS HEAVIER AND MORE WIDESPREAD THAN INITIALIZED.
ADDITIONALLY...WIND SPEEDS ARE 10 TO 12 KNOTS STRONGER ACROSS THE
NORTHERN HALF OF THE STATE.

JAMES