So that featured I drew into the grids was intentionally done in each forecast for this event based on meteorologist experience (a combo of going to school at Lyndon State and forecasting for the area for numerous years). The reason behind that swath of lower totals stems from SE winds forced over the Kinsman-Cannon Range & Garfield Ridge, which is called downsloping. This dries out & warms the environment locally, which is more hostile to adding up precipitation there in those regimes.