Today through Thursday...An upper low pressure system will continue to influence the weather over the PacNW during the short term period. Over the past couple of days this upper low has bright a warm south to southwest flow over the forecast area with moderately high CAPE values, negative LI`s and diffluence aloft for isolated to scattered thunderstorms...mainly from central to northeast Oregon. This will still be the case today and Wednesday, but the coverage and intensity of thunderstorms will decrease due to cooling temperatures, cloud cover and the lack of forcing to help kick off thunderstorm development. One thing that will remain unchanged is the fact there will be a fairly solid coverage of showers over the forecast area...especially during the afternoons and evenings.
