Number of cities plotted: 382
This website provides information about when heat wave days, as defined in the ‘About’ section, are present in different locations in Washington State.
Select 80°F (corresponding to regular clothing) or 52°F (corresponding to nonbreathable clothing) in the ‘Trigger Temp’ drop-down menu.
Select ‘yes’ or ‘no’ in the ‘Heat Wave’ menu (note: ‘yes’ will not be available if there are no heat wave days, and there will be no cities visible on the map if ‘yes’ is checked but there are no heat wave days for the selected trigger temperature).
Single click on a dot on the map or type a city into the ‘City Search’ box to obtain information about that city. You can also single click on cities in the table to see those cities highlighted in the map, and single click again to un-highlight them.
Red dots on the map indicate a ‘Heat Wave’ day is expected at that location, and blue dots indicate a ‘Heat Wave’ day is not expected at that location. A gray dot on the map indicates data are not available at that location.
The information on this website is only for the ‘Forecast date’ listed at the top of the website.
Note: This website is currently a beta (preliminary) version. Please provide feedback on the content and format of this website using the link in the ‘Feedback’ section at the bottom of the website.
The information provided on this website was developed using data from the Visual Crossing API. A ‘heat wave’ day was defined according to the proposed updated Washington State occupational heat rule as a predicted high temperature for the day of 80 degrees Fahrenheit or higher (for workers wearing regular work clothes) or 52 degrees Fahrenheit or higher (for workers wearing nonbreathable clothing) AND at least 10 degrees Fahrenheit (°F) higher than the average high daily temperature in the preceding five days.
Every day:
The predicted maximum temperature for that day (‘Predicted Max Temp’) is determined to be at or above 80 or 52 °F (‘Trigger Temp’);
The average maximum daily temperature (‘Average Max Temp’) for the previous five days (‘Num Days Averaged’) is calculated; and
The difference between the ‘Predicted Max Temp’ and ‘Average Max Temp’ is reported (‘Max Temp Difference’). A positive difference indicates that the ‘Predicted Max Temp’ is higher than the ‘Average Max Temp’, and a positive difference of 10°F or higher indicates a ‘Heat Wave’ day.
Download the data as CSV files.
Please email heatwave@uw.edu with feedback.