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The 2021 Western North America heat wave was an extreme heat wave that affected much of Western North America from late June through mid-July 2021. [5] The heat wave affected Northern California, Idaho, Western Nevada, Oregon, and Washington in the United States, as well as British Columbia, and in its latter phase, Alberta, Manitoba, the Northwest Territories, Saskatchewan, and Yukon, all in ...
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On May 12, the National Weather Service issued a health advisory between May 13 and 15 for the western parts of Oregon and Washington state. [12] [13] On May 13, four locations in the Seattle region broke temperature records, with Quillayute reaching 90 °F (32 °C), SeaTac reaching 86 °F (30 °C), and Olympia and Hoquiam reaching 89 °F (32 °C).
A heat advisory is a notice issued by the National Weather Service of the United States.Local offices often have their own criteria. High values of the heat index are caused by temperatures being significantly above normal and high humidities, and such high levels can pose a threat to human life through conditions such as heat stroke.
On NOAA's HeatRisk tool, the scale ranges from 0 or green, meaning little or no risk from expected heat, to 4 or magenta, which indicates extreme and/or long-duration heat-related impacts.
The threshold for a heat advisory in the local Tri-State area, including Washington County and Franklin County, Pa., is a 100 degree heat index for two or more hours, said meteorologist Craig ...
An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time.
A new color-coded heat warning system relies on magenta to alert Americans to the most dangerous conditions they may see this summer. The National Weather Service and the Centers for Disease ...