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Here it comes.
Purple = Excessive heat warning
Brown = Heat advisory

Screenshot text is for California.

For weather details from NOAA, including the timing, open the map, click/tap any colored area, follow the link. Since the spot you clicked might have more than one type of weather watch/warning, scroll down in the popup since each type of watch or warning has its own link for the details.
#ClimateChange #HeatWave #CAwx #NVwx #AZwx

Open GISsurfer map:
https://mappingsupport.com/p2/gissurfer.php?center=34.768616,-117.180176&zoom=6&basemap=USA_basemap&overlay=State_boundary,Weather_watch_warning&data=https://mappingsupport.com/p2/special_maps/disaster/USA_weather.txt