textproduct: Pendleton

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

DISCUSSION

For the evening hours, the HREF ensemble mean shows a bolstering of the chances for visibility under one half mile, through out the foothills of the Northern and Southern Blue mountains and adjacent Columbia Basin of Oregon, Horse Heaven Hills, North Central Oregon and well as the Simcoe Highlands. Trends this afternoon will determine how many will require dense fog advisories, however an early showing of higher confidence probabilities coupled with the GFS LAMP favors the PDT/ALW areas overnight. Temperatures across the next couple of days will change very little across the cloudy/stratus areas especially below 2500 ft. NBM low temperatures for Friday morning vary only about 5 degrees between the 10th and 90th percentile members leading to fairly high confidence. As for highs, temperatures were running about 5 degrees too warm across the stratus influenced areas which will be the case again on Friday. The pattern will change from a fog to a rain pattern by Saturday with potential for several inches of snow in the high elevations of the Cascades, beginning around Sunday and running though Monday as the snow levels crash from around 5000 ft AGL to around 2800-3500 ft by Monday morning. This should favor a few inches (A Trace up to 2 or 3) in the pass levels to several inches of snow (6+) in the higher elevations based on the NBM right now. Total expected QPF averages about 0.75 across the lower slopes, around one half to one inch across the Blue Mountains. With a couple of tenths of an inch of rain over the low lands.

Preliminary Point Temps/PoPs

PDT 32 44 35 53 / 0 0 0 0 ALW 35 45 38 54 / 0 0 0 10 PSC 32 41 34 48 / 0 0 0 10 YKM 32 42 34 44 / 0 0 0 10 HRI 34 42 35 49 / 0 0 0 0 ELN 32 40 32 41 / 0 0 0 30 RDM 27 50 30 56 / 0 0 0 0 LGD 35 57 36 58 / 0 0 0 0 GCD 33 57 34 58 / 0 0 0 0 DLS 37 45 38 49 / 0 0 0 20

PDT WATCHES/WARNINGS/ADVISORIES

WA...None. OR...Air Quality Alert until noon PST Saturday for ORZ506-509.

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