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

Clouds are overspreading the entire area as rain became anchored across the Washington Cascades this morning. For the balance of the afternoon the area can expect better than just under one tenth of an inch per hour to as much as one quarter inch per hours in the higher rainfall rates in those highest level Cascade mountain zones. Rain will also develop over the eastern mountains after around 5 pm as the rains over the Cascades crest begin to trend towards lower rates. Very high snow levels (7-9kft) this afternoon will be crashing Tonight to around 2500 ft AGL in the WA Cascades to around 3-4 kft in the Oregon Cascades and Northern Blue Mountains, creating a dusting up to a couple of inches total over Wednesday/Wednesday Evening. Other than the breezy conditions Wednesday following Today's marginal near advisory level wind gusts in locations like the Simcoe Highlands, and Yakima Valley, no near headlines worthy weather elements pose a risk other than the ongoing high running and flooding rivers to the Yakima mainstem and its largest tributary the Naches through mid week. Look to an opportunity for elevated fire risk later in the week, pointing Friday especially (see Fire Weather section). Although some cloud cover is noted by the NBM mean the temperatures for the weekend ramp up from a broad lowland 50s and low 60s to mid an upper 60s for the low lands and into the 70s across the John Day Basin and Ochoco Highlands/Grande Ronde Valley.

AVIATION /06Z TAFS THROUGH 06Z THURSDAY/

VFR conditions are generally expected through the TAF period. There are some isolated rain showers in and around PDT and ALW. These should be moving out in the next hour or two. However, if a shower impact either site, there could be some brief MVFR as there was some brief MVFR earlier. Otherwise, winds will mainly be 10 kts or less through the night and into the early morning, then winds are expected to increase and become gusty with gusts in the 25 to 30 kt range in the afternoon and evening hours.

FIRE WEATHER

Overall its a lower risk of fire weather risk parameters through midweek. Although breezier periods over the next couple of days, relatively high afternoon relative humidity will be experienced. Following that, when the drier air develops later in the week, especially Thursday into Friday, the NBM 25th to 75th percentiles show some potential for elevated fire weather conditions. The high end of the statistical candlestick produces 20 mph gusts across areas than have an NBM mean well below 20% minimum afternoon relative humidity, particularly the Ochoco-John Day Highlands and eastern slopes of the Oregon Cascades parts of central Oregon.

HYDROLOGY

Additional rains across the WA Cascades today will keep the Yakima River and its tributaries running high through the week. The Naches, which has been in minor flood, will remain so until Thursday afternoon, cresting below moderate stage midday Wednesday. Additionally the Yakima is forecast to remain in minor flood until falling below Thursday evening.

Preliminary Point Temps/PoPs

PDT 43 55 29 53 / 80 40 10 0 ALW 45 57 33 52 / 90 50 20 0 PSC 43 62 33 58 / 50 10 10 0 YKM 35 57 28 54 / 20 10 10 0 HRI 43 60 31 56 / 60 10 10 0 ELN 33 49 27 49 / 20 30 10 0 RDM 37 55 20 53 / 40 10 10 0 LGD 43 54 27 49 / 100 70 30 0 GCD 47 59 26 51 / 70 40 10 0 DLS 42 57 34 59 / 70 50 20 0

PDT WATCHES/WARNINGS/ADVISORIES

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

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