Area Forecast Discussion
Issued by NWS Pendleton, OR

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000 FXUS66 KPDT 191636 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 936 AM PDT Mon Apr 19 2021 .MORNING UPDATE...The weak, dry cold front that brought periods of breezy conditions and patchy blowing dust last night is exiting the region this morning. Cooler air is filtering into the region behind the frontal passage and will lower afternoon temperatures around 15 degrees cooler than yesterday. Tonight, cooler dry air over the region combined with light winds will allow low temperatures to dip into the lower 30s across much of the forecast area. Freeze warnings will be in effect across the Yakima valley, Columbia Basin, and into north central OR for tonight through early Tuesday morning. Otherwise, cloud cover will increase later this afternoon over central OR today as a shortwave moves into southwest OR. This system will be fairly dry with any precipitation chances remaining south of the forecast area. Made minor updates and added Yakima valley to the freeze warning, with rest of morning forecast package on track. Lawhorn/82 && .PREV DISCUSSION... /issued 230 AM PDT Mon Apr 19 2021/ SHORT TERM...TODAY THROUGH WEDNESDAY...A dry cold front from Canada is working its way southward across the forecast area at this time. This is ushering in cooler temperatures with todays high temperatures being around 15 degrees cooler than on Sunday which puts us back to near normal. Cool dry air over the region tonight combined with light winds will allow Monday night low temperatures to dip into the lower 30s. A freeze warning will be in effect through early Tuesday morning. Those who have begun growing outdoor vegetation that would be sensitive to freezing temperatures should take necessary precautions to provide protection. Meanwhile, a piece of energy over the eastern Pacific will begin to undercut the ridge of high pressure along the coast and move into southwest Oregon late today and overnight before moving into the Great Basin on Tuesday. This system will have little impact to the forecast area other than some cloudiness over central Oregon. Any precipitation threat will remain south of the forecast area. The ridge will then remain off the coast keeping us under a dry northerly flow through Wednesday. Will see a gradual warming trend through the first of the week with coolest temperatures being today. LONG TERM...Thursday through Sunday...Models and ensemble guidance coming into better agreement for the long term. Thursday will see northwest flow as model guidance is better in line with keeping ridge offshore. Another back door cold front will slide down east side of ridge down the Rockies and will likely clip the region. Expect a chance of showers over the east, esp over the northern Blues and Wallowas. Increasing winds through the gorge and Cascade gaps Thur as thermal and pressure gradients tighten west to east across the Cascades and with frontal passage. While majority of model and ensemble guidance have the ridge building over the CWA with dry conditions For Friday, some solutions are keeping ridge off shore with northwest flow continuing with a few lingering showers for northeast mountains. For Friday night into weekend expect ridge axis to quickly work overhead and push east as the main large scale upper low approaches the coast. Flow is expected to turn more southwest with increasing mid to high level moisture and cloudiness streaming overhead Friday night into early Saturday. As the low approaches the region, it is expected to pull in a fairly deep plume of Pacific moisture ahead of it and spread it over the region. Rain chances look to return by Saturday afternoon and continue through Sunday as the large upper low approaches northern Cali coast. Mild Thu/Fri with highs in the upper 60s to 70s. Breezy winds possible and slightly cooler temps expected for the weekend as cold front passes through, with highs by Sunday forecasted to be in the upper 50s to 60s. AVIATION...12Z TAFs...VFR conditions expected through the period. Skies sct-bkn 8-10kft at taf sites except RDM/BDN this morning will give way to clear skies this afternoon. Winds 8-14g16-22kts through early evening will become light overnight. && .PRELIMINARY POINT TEMPS/POPS... PDT 62 33 67 35 / 0 0 0 0 ALW 66 37 69 40 / 0 0 0 0 PSC 68 35 72 37 / 0 0 0 0 YKM 67 32 71 35 / 0 0 0 0 HRI 68 32 72 35 / 0 0 0 0 ELN 64 31 68 34 / 0 0 0 0 RDM 65 27 66 28 / 0 0 0 0 LGD 59 31 62 33 / 0 0 0 0 GCD 63 32 64 35 / 0 0 0 0 DLS 70 38 73 40 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...Freeze Warning from midnight tonight to 9 AM PDT Tuesday for ORZ044-507-508-510. WA...Freeze Warning from midnight tonight to 9 AM PDT Tuesday for WAZ027>029. && $$ MORNING UPDATE...82 SHORT TERM...91 LONG TERM....84 AVIATION...84

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