Quantitative Precipitation Forecast Discussion NWS Weather Prediction Center College Park MD 258 AM EDT Wed May 09 2018 Prelim Day 1 QPF Discussion Valid May 09/1200 UTC thru May 10/1200 UTC Reference AWIPS Graphics under...Precip Accum - 24hr Day 1 ...Great Lakes into the OH Valley... There are no significant mass field differences in the latest suite of models with the eastward push of the mid to upper level trof from the Upper MS Valley into the Great Lakes-OH Valley. Fairly well defined upper difluence ahead of this trof in an axis of above average pw values will support a broad area of scattered to organized convection across these areas. Confidence is low with qpf details---with general model consensus for widespread moderate to heavy precip values. The WPC day 1 qpf leaned toward the href mean and in house hi res ensemble mean---with areal average .25-.50"+ amounts depicted. ...Southeast New England... The mid to upper level trof moving off the NC coast early this morning is expected to become increasingly negatively tilted as it pushes northeastward---passing close to Cape Cod and the offshore Island early Thursday morning. The northwest edge of the associated precip with this system may impact southeast New England with moderate totals in the .25-50"+ range. ...Pacific Northwest---Northern Rockies into the Northern High Plains... A lead area of height falls will be pushing eastward Wednesday from the Pacific Northwest into the Northern Rockies and then eastward into the Northern High Plains Wednesday night into early Thursday morning. A concentrated area of large scale uvvs along and ahead of the associated frontal boundary with these height falls will support an organized area of precip pushing eastward across these areas. Model consensus is for .25-50"+ totals from far northeast WA---across northern ID and into western to central MT. Additional upstream northeast Pacific height falls will follow this lead area---pushing into the coastal areas of Washington-Oregon Wednesday night into early Thursday morning. Overall weaker large scale dynamics and lower pw values will support mostly light to moderate additional precip totals late Wednesday into early Thursday for coastal sections of Washington and Oregon. Oravec