MODEL DIAGNOSTIC DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1209 PM EDT TUE MAY 09 2017 VALID MAY 09/1200 UTC THRU MAY 13/0000 UTC ...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR INGEST... 12Z GFS/NAM EVALUATION WITH PRELIMINARY MODEL PREFERENCES ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GFS/NAM INITIALIZATION ISSUES DO NOT APPEAR TO DEGRADE THEIR SHORT RANGE FORECASTS. DEEP CYCLONE MOVING INTO THE NORTHWEST TROUGH/UPPER LOW PROGRESSING THROUGH THE MS VALLEY CYCLONE LEAVING NEW ENGLAND ~~~~~~~~~~~~~~~~~~~~~~~~~~~ THE GUIDANCE SHOWS RELATIVELY GOOD AGREEMENT NEAR THE LOWER 48. A COMPROMISE OF THE AVAILABLE GUIDANCE -- SIMILAR TO THE PARALLEL VERSION OF THE NATIONAL BLEND OF MODELS -- SHOULD SUFFICE WITH ANY LINGERING DETAIL ISSUES SUCH AS THOSE SEEN IN THE MISSISSIPPI VALLEY AND APPALACHIANS FRIDAY. CONFIDENCE IS ABOVE AVERAGE IN THIS CHOICE. WWW.WPC.NCEP.NOAA.GOV/HTML/MODEL2.SHTML... /ALL LOWER CASE/ WWW.WPC.NCEP.NOAA.GOV/H5PREF/H5PREF.SHTML... /ALL LOWER CASE/ ROTH