582 FXUS66 KPDT 131753 AAA AFDPDT Area Forecast Discussion...Updated National Weather Service Pendleton OR 1053 AM PDT Sat Apr 13 2019 Updated aviation discussion .SHORT TERM...Today and tonight...A weather system will move through southern British Columbia today which will push a cold front through the forecast area this afternoon and overnight. Will see increasing clouds today and then rain this afternoon and evening turning to showers and breezy conditions following the frontal passage. && .HYDROLOGY...No new precipitation in the last 12 to 24 hours and streams and rivers are on their way down which will likely lead to the cancellation of some of the flood warnings soon. Main concern is the Mckay Creek drainage below the dam where water release from the dam will continue to run high in an attempt to lower the reservoir. && .AVIATION...18Z TAFs...Broken to overcast mid and upper level cloudiness will remain over the area as a cold front crosses the area today. Partial clearing expected overnight and tomorrow morning. Will see some rain showers along and ahead of the cold front primarily affecting PDT/PSC/ALW with rain accumulations of around a tenth of an inch with lesser amounts possible for the remaining terminals. Conditions will be mostly VFR aside a brief drop in cigs to 025-030 at PDT/ALW with cold frontal passage. Winds will increase this morning/early afternoon ahead of the front to southwesterly 10-15 kts before increasing to 15-20 kts with higher gusts from the west/northwest behind the front. Winds will then slowly taper off late tonight and tomorrow morning. Perry && .PREV DISCUSSION... /issued 318 AM PDT Sat Apr 13 2019/ SHORT TERM...Today through Monday night. Clear to partly cloudy skies over the region early this morning as high pressure provides a brief break in the active weather. Satellite shows next cold front is approaching the Pacific northwest. The front will move across the forecast area today. This will bring a period of rain mostly in the afternoon and evening. Highest amounts will be over the Cascades and Blues with 1/4 to 1/2 inch possible. Winds will increase after frontal passage becoming breezy in the afternoon and evening. Westerly flow aloft tonight will maintain showers over the mountains otherwise partly to mostly cloudy skies. For Sunday expect similar conditions with westerly flow aloft. Partly to mostly cloudy with showers mainly over the Cascades and Blues. Breezy winds will continue. The next system to move across the region will be stronger and slower moving. This will result in another period of rain Monday into Mon night. Have increased pops and rainfall amounts. 94 LONG TERM...Tuesday through Saturday...Upper level trough will continue swing through the region through the day Tuesday morning. GFS/GEFS/EPS are further north than the operational EC with the associated Pacific moisture plume and have trended in that direction. With a rather quick hit of precipitation and snow levels around 3500-4000 feet this should yield minimal further aggravations with spring runoff out of the Blues. Upper level ridging over the Pacific will slowly drift east over the Inland Northwest Wednesday through early Friday with daytime highs reaching 5 to 10 degrees above normal for most locations. In the Blues, this will mean daytime highs in the upper 50s to lower 60s and overnight lows in the mid 30s to lower 40s. With significant snow water equivalents locked in a very ripe snowpack above 4500 feet still waiting to come down, this will keep rivers, streams and creeks draining the Blues running high, cold and fast through the end of the week. Operational GFS keeps the ridge heading into Saturday while bulk of remaining guidance suggesting southwesterly flow with some convective potential... have trended toward the showery potential with some slight chance of rain showers mostly for the southern 1/3rd of the forecast area. Peck && .PRELIMINARY POINT TEMPS/POPS... PDT 57 39 53 36 / 80 70 10 20 ALW 59 39 55 38 / 90 80 10 20 PSC 61 42 59 38 / 70 20 0 20 YKM 59 36 57 35 / 50 0 10 20 HRI 60 41 58 38 / 70 20 0 20 ELN 54 34 51 33 / 50 10 10 20 RDM 59 35 50 31 / 30 20 20 30 LGD 56 35 49 32 / 50 80 20 30 GCD 59 37 48 33 / 40 70 20 30 DLS 56 40 56 38 / 60 40 20 20 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ 91/83/83