Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 241 PM EDT Tue Apr 24 2018 Valid 00Z Wed Apr 25 2018 - 00Z Fri Apr 27 2018 ...Heavy rain possible over Mid-Atlantic and New England States... ...Record high temperatures possible across the West today and tomorrow... A deep layer cyclone will move northeast up the Northern Mid-Atlantic and New England coasts over the next couple of days. The system will produce showers and thunderstorms within its warm conveyor belt to the east and northeast of the surface low. Generally heavy rain of 1-2 inches, with locally higher amounts, is expected from northern Virginia northeast through Maine through Thursday with a marginal risk of excessive rainfall anticipated. An upper level disturbance over the Northern Rockies will move southeastward to the Central/Southern Plains by Wednesday evening, driving a weak cold front forward. Light snow over parts of the Northern/Central Rockies and the Northern/Central High Plains is expected to fade tonight. Rain will develop over parts of the Northern/Central Plains that will ends by Wednesday morning. Rain then advances into the Middle/Lower Mississippi Valley on Wednesday. Within areas of greater instability, showers and thunderstorms will develop along and ahead of the associated front over parts of the Southern High Plains today and tonight, moving southeast into the Southern Plains Wednesday then streaking through the Gulf Coast and Southeast Wednesday night and Thursday. Another cold front over Western Canada will sink southward into the Northern High Plains/Northern Rockies on Wednesday and Thursday which will produce areas of light rain over parts of the region by Wednesday evening with thunderstorms across the southern Plains expected Thursday. Out West, a strong packet of energy aloft moves towards the region, sparking showers and thunderstorms across Oregon, northeast California, and northwest Nevada Thursday afternoon and evening. For the rest of the area, dry conditions are expected under a dome of high pressure aloft. Record high temperatures are possible Tuesday and Wednesday across the Pacific Northwest and Desert Southwest. Roth Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php