MODEL DIAGNOSTIC DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1201 PM EDT THU APR 17 2014 VALID APR 17/1200 UTC THRU APR 21/0000 UTC ...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR INGEST... 12Z NAM/GFS EVALUATION WITH PRELIMINARY MODEL PREFERENCES ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NAM/GFS INITIALIZATION ERRORS DO NOT SEEM TO DEGRADE THEIR SHORT RANGE FORECASTS. THE GUIDANCE IS IN GOOD AGREEMENT MASS FIELD-WISE AT 500 HPA, 700 HPA, AND THE SURFACE PRESSURE FIELD FROM COAST TO COAST. A GENERAL MODEL COMPROMISE IS PREFERRED WITH ABOVE AVERAGE CONFIDENCE CONSIDERING THE GOOD MODEL AGREEMENT. www.wpc.ncep.noaa.gov/html/model2.shtml... ROTH