Model Diagnostic Discussion NWS Weather Prediction Center College Park MD 236 PM EDT Sun Jun 07 2020 Valid Jun 07/1200 UTC thru Jun 11/0000 UTC ...See NOUS42 KWNO (ADMSDM) for the status of the upper air ingest... 12Z Model Evaluation Including Final Preferences and Confidence ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ...Closed low over the Pacific Northwest swinging across the northern Rockies late today... ...Associated upper trough moving from the Great Basin to the Great Plains tonight through Tuesday... ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Preference: non-GFS blend Confidence: Average Overall, models are in fairly good agreement across the Lower 48 with the shortwave lifting out across the northern High Plains into central Canada on Monday. However, models solutions continue to diverge over central Canada; with the GFS continuing to develop a deeper closed system centered along the southern Saskatchewan-Manitoba border Monday night. With respect to the energy in the base of the trough moving from the Four Corners region on Monday to the central Plains on Tuesday - the NAM, ECMWF, UKMET, and Canadian all show a mid-to-upper level center closing off over Kansas late Tuesday. Despite a trend toward a slower solution, the GFS is still a fast outlier -- showing a more progressive, open wave lifting northeast across the mid Mississippi valley to the upper Great Lakes late Tuesday and Wednesday. ...Cristobal... ~~~~~~~~~~~~~~~~~~ Preference: 15Z NHC advisory Confidence: Refer to NHC products Models are fairly well-clustered through early Tuesday -- showing a similar track along the lower into the mid Mississippi valley. By late Wednesday, as models begin to show increasing spread, the GFS lines up closest to the latest NHC forecast position. By early Wednesday, the 12Z GFS, ECMWF, UKMET and Canadian are all similar to the NHC track in showing a position over Lake Superior. At that point, the NAM begins to become a more easterly outlier. Model trends at www.wpc.ncep.noaa.gov/html/model2.shtml 500 mb forecasts at www.wpc.ncep.noaa.gov/h5pref/h5pref.shtml Pereira