Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 252 PM EDT Mon Oct 31 2022 Valid 00Z Tue Nov 01 2022 - 00Z Thu Nov 03 2022 ...Halloween Trick-or-Treaters may get wet across the eastern third of the Lower 48, South Texas and from portions of the Northern Rockies into the Pacific Northwest... ...A big cool down for areas west of the Rockies, while much above average temperatures persist to the east of the Rockies all the way the east coast... ...Much needed precipitation to spread southward through California Monday night into Wednesday... ...Heavy snows possible across portions of the Northern Rockies, Oregon Cascades and northern to central Sierra... ...Fire weather threats increase Tuesday into Wednesday across the Central High Plains... Unsettled weather may haunt Trick-or-Treaters this evening across the eastern third of the nation, South Texas and from portions of the Northern Rockies into the Pacific Northwest. All of these areas will have the potential for precipitation this evening as they are affected by three different storms systems. The mid to upper level flow across the Lower 48 will become increasingly amplified early this week as a strong upper trough forms along the west coast on Tuesday and pushes inland on Wednesday. This will bring a big cool down to temperatures across the west with below average temperatures expected Tuesday from the Pacific Northwest into California, pushing inland through the Great Basin and Northern Rockies on Wednesday. The opposite will occur from areas to the east of the Rockies all the way to the east coast where above average temperatures are expected over the next few days. The heavy rains that have been affecting the Pacific Northwest this weekend will be shifting southward tonight into Wednesday, bringing some much needed rains to portions of California. The heaviest precipitation expected from Northern California into the Sierra, with lighter totals expected across Southern California. While much needed, this precipitation will not make much of a dent in the extreme to exceptional drought that continues to plague much of California. The cooler temperatures across much of the west will also support potential for heavy snows through portions of the Northern Rockies from northwest Montana, northern Idaho and northeast Oregon, through the Cascades of Oregon and southward into the northern and central Sierra of California. Increasingly windy and dry conditions late Tuesday into early Wednesday are forecast to develop across large sections of the Central High Plains. This will support an elevated fire weather risk from eastern Colorado, southeast Wyoming, western Nebraska and into southwest South Dakota. Happy Halloween! Oravec Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php