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What is Root Mean Square Error?

Root mean square error (RMSE) is defined mathematically as:

RMSE = 1 N Σ i = 1 N F i – O i 2

where

Fi = the forecast values of the parameter in question

Oi = the corresponding verifying value (observed or analysed)

N = the number of verifying points (grid points or observations) in the verification area

RMSE is a measure of the "average" error, weighted according to the square of the error. It answers the question, "what is the average magnitude of the forecast errors?", but does not indicate the direction of the errors. Because it is a squared quantity, RMSE is influenced more strongly by large errors than by small errors. Its range is from 0 to infinity, with 0 being a perfect score.

Weather shortcuts


How to use
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    • Go to the desired page on the site, open the Weather shortcuts menu and click on the "Add to shortcuts" button
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    • Click on the "Save" button to add the link to the list
    • Click on the "X" button to close the panel
  • Delete a link
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    • Click on the "Delete" button to remove the link from the list
    • Click on the "Close" button to save the change
  • Move a link up/down the list
    • Click on the "Organize shortcuts" button
    • Click and hold the link and move to new location in the list
    • Click on the "Close" button to save the change
  • Rename a link
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    • Select the link to rename
    • Click on the "Rename" button and change the link name
    • Click the enter or tab key
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  • Keyboard navigation
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    • Use the Enter key to click on buttons or links
    • Organize shortcuts navigation
      • Use the ↑ Up key to select the link above. If none are selected, it will select the first link.
      • Use the ↓ Down key to select the link below. If none are selected, it will select the last link.
      • Use the Page Up key to move a selection up in the list.
      • Use the Page Down key to move a selection down in the list.
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    Warning: Clicking on the button below will remove all your customized links.

Customized Weather shortcuts

Save your customized list as a bookmark.

Copy/paste or click on the link below then when the page displays, you can bookmark the page using the web browser. Bookmarking your customized list will allow you to access it even if the local storage on your device is erased.

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