Model Diagnostic Discussion NWS Weather Prediction Center College Park MD 224 AM EST Tue Feb 20 2018 Valid Feb 20/0000 UTC thru Feb 23/1200 UTC ...See NOUS42 KWNO (ADMNFD) for the status of the upper air ingest... Please refer to the WPC QPFPFD precipitation forecast discussion for details on model preferences and system timing until the next PMDHMD is issued at 1645 UTC. Previous model trends at www.wpc.ncep.noaa.gov/html/model2.shtml Previous 500 mb forecasts at www.wpc.ncep.noaa.gov/h5pref/h5pref.shtml