Via Weather.com. Various alerts have been posted covering the entire Washington/Oregon region. For information covering your area, see–
NOAA Advisory
Weather.com Advisories
HEAT/AIR-STAGNATION WARNINGS
WESTERN WHATCOM COUNTY- SOUTHWEST INTERIOR-WESTERN SKAGIT COUNTY- HOOD CANAL AREA-LOWER CHEHALIS VALLEY AREA- WEST SLOPES NORTHERN CASCADES AND PASSES- WEST SLOPES CENTRAL CASCADES AND PASSES- 110 PM PDT THU AUG 14 2008
…AIR STAGNATION ADVISORY [...]