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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.

KEY MESSAGES

- Warming trend next week.

DISCUSSION

A tight zonal flow pattern is in place at the base of a more broad mid level trough across the Columbia basin . A thermal trough was also developing along the nrn CA and srn OR coasts. Models show the northward development of the thermal trough through Monday as an upper ridge build back over the Cascades behind the exiting shortwave. As the upper ridge builds through the week, hotter temperatures are expected to develop each afternoon through Thursday; Thursday will be the hottest day with widespread upper 90s across the Columbia Basin, Snake River and John Day Basins. Heat Risk will be widespread in the Minor category (yellow) with some locally Moderate Wednesday onto Saturday. Thursday will the the warmest day with areas of of moderate heat risk affecting those sensitive to heat and without cooling to hydration, and some health systems. Following into the weekend, the upper ridge appears to flatter based on the GFS/EC as shortwave energy moves across BC. This pattern would ease the Heat while remaining dry. The 6 TO 10 DAY OUTLOOK leans dryer than normal with warmer than normal temperatures for the August 7 to 11 period.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Nighttime microphysics RGB satellite channel is showing clear sky with some stratus along he Cascades and patchy 4-5kft stratus in the Oregon Columbia Basin. Winds Today will be lighter as high pressure dominates.

FIRE WEATHER

Relative humidity will remain critical over the next week. Wind will be lacking enough to prevent any risk of widespread red flag criteria. Red flag criteria could be met on a more localize basis and mainly in the last few hours of the afternoon as afternoon mixing/wind gusts become maximized with this weather pattern.

Preliminary Point Temps/PoPs

PDT 77 45 81 50 / 0 0 0 0 ALW 78 51 83 55 / 0 0 0 0 PSC 82 50 86 53 / 0 0 0 0 YKM 81 51 84 56 / 0 0 0 0 HRI 80 51 85 54 / 0 0 0 0 ELN 74 49 82 55 / 0 0 0 0 RDM 79 38 83 44 / 0 0 0 0 LGD 78 46 83 49 / 0 0 0 0 GCD 81 45 85 48 / 0 0 0 0 DLS 79 56 87 60 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

WA...Air Quality Alert until further notice for WAZ028>030. OR...Air Quality Alert until 2 PM PDT Monday for ORZ044-049-050-502- 503-505>511.

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