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Weather Forecast Near the Ground

As an aid to planning astronomical observing sessions, we offer wind, temperature, and relative humidity forecasts. Wind and temperature forecasts are useful for deciding what clothing to wear, and windy conditions can impair observing due to telescope vibrations. The relative humidity forecast can help astronomers decide whether or not to apply gentle heat to lenses to prevent dew formation. Note that the actual 10km resolution RDPS model used to produce these forecasts has cold bias and weak wind bias on top of mountains.

Winds forecast are represented by 6 colour levels.

Dark blue: Calm winds.
Medium blue: Light winds.
Light blue: Light to moderate winds.
Pale blue: Moderate winds.
Grey: Strong winds.
White: Very strong winds.

Regional model, surface wind forecast for North America

Surface wind forecastFootnote†
00 UTC

Animation

12 UTC

Animation

Temperature forecastFootnote†
00 UTC

Animation

12 UTC

Animation

Relative humidity forecastFootnote†
00 UTC

Animation

12 UTC

Animation

Footnote

†T+hh refers to the forecast’s time interval (hh), in hours, from the hour T of the model’s initial run time. The hour T is indicated, in Universal Time, at the top of each column.

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
    • Page name will display in the "Add this page" window, the name can be changed by highlighting the text and entering the desired name
    • Click on the "Save" button to add the link to the list
    • Click on the "X" button to close the panel
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    • Click on the "Close" button to save the change
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    • 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
    • Click on the "Close" button to save the change
  • 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.
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      • 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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