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This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

DISCUSSION

A progressive pattern will continue this weekend and through next week. Windy conditions are anticipated on Sunday afternoon as the forecast area undergoes mid level height falls and boundary layer warm advection. Mid level vorticity a zonal atmospheric river becomes more pronounced Monday, when Mountain snows become more impactful near the Pass levels in the WA Cascades. Daytime surface road temps might still be challenged by snow rates on Monday with slick roads at pass levels as 6 inches is possible at pass levels (70-80% confidence). This initial AR is followed up and another wave of moisture on increasing mid level height and stronger jet level winds Wednesday and Thursday. Thursday could also be a particularly windy day for the forecast area as the NAEFs shows an SA of around 3 across the Columbia Basin at the 850 mb level. The NAEFs also shows the moisture transport /IVT transitioning from a more robust episode over the weekend, with a meridional aspect, returning by Wednesday , weaker in terms of standardized anomalies but more zonal, impinging on the Mountains with lower snow levels. Mean SLRs fall from decent 15:1 at the pass levels on Tuesday into the 9 to 10:1 range by Wednesday into early Thursday. NBM ramps up snow Wednesday with mean totals of 2 to 4 feet of snow across the eastern Slopes of the WA Cascades through Friday (50% confidence for pass levels and 60-80% confidence in the higher elevations). Similarly one to two feet of snow is possible across the Oregon Cascade Eastern Slopes, and up to a foot of snow for the Northern Blues and Wallowas. The 6-10 day leans on normal temperatures and wetter than normal precipitation before trending to warmer , and slightly leaning wetter for the 8-14 (week 2) period, ending into the 3rd week of March.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

VFR conditions will prevail through the forecasted period. CIGs will be 10-25kft through the day with some TAF sites clearing to SKC. A shortwave disturbance will bring elevated winds across TAF sites DLS/ALW/PDT/PSC ranging from 10-17kts with gusts nearing 30 kts through the period. 90

Preliminary Point Temps/PoPs

PDT 64 43 63 34 / 20 0 10 30 ALW 64 47 62 35 / 20 0 20 50 PSC 69 46 66 34 / 10 0 0 10 YKM 66 40 62 30 / 10 0 20 0 HRI 67 45 65 35 / 10 0 0 10 ELN 58 41 55 30 / 10 10 40 20 RDM 62 32 60 30 / 10 0 0 0 LGD 61 39 60 32 / 30 0 10 50 GCD 58 35 60 36 / 20 0 0 20 DLS 63 46 60 37 / 20 10 40 30

PDT WATCHES/WARNINGS/ADVISORIES

WA...None. OR...None.

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