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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 ...
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The heat can be particularly dangerous in some cities west of the Cascades in western Washington, such as Seattle, Olympia and Port Angeles, where many people and homes do not have air conditioning.
Map of regions covered by the 122 Weather Forecast Offices. The National Weather Service operates 122 weather forecast offices. [1] [2] Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts.
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 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).
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.
More than 100 million people were put on heat alerts, and over 85% of the country had temperatures at or above 90 °F (32 °C). A man died in Dallas County, Texas, and a heat emergency was triggered in Washington DC due to temperatures over 95 °F (35 °C), on the weekend of July 23–24. This extreme heat severely intensifies drought conditions.