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California Regional Weather Server
Instructions and Warnings for U.S. Weather-Radar Animations

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• Starting Instructions:
1. Select the desired length of the animation (default is 12 hours).
2. Select the interval between images (default is 2 hours).
3. Press the "Build Animation" button.

The interval between images partly determines the total number of images in the animation and hence both the downloading time and the extent to which changes occur from one image to the next. For example, an animation length of 1 day and an interval between images of 2 hours will generate a loop with 13 images in it, covering a 24-hour period ending with the latest available image and with 2 hours between images.

Missing images are listed and then automatically skipped.

• To step through animations frame-by-frame, first press the "Stop" button ("*"), then press the "Next" button ("|>") repeatedly to advance frames one at a time. Similarly, press the "Prev" button ("|<") to step backward one frame at a time.
• To restart the animation after stopping it, press the "Resume" button (">").
• The WWWeb server (virga.sfsu.edu) receives data for a new U.S. weather-radar map each hour, usually by 5 minutes after the following hour. To update an animation to add any newly created map(s) (which also drops the oldest map from the animation), simply press the "Build Animation" button again.

Trouble-shooting:

• If the animation does not seem to be working correctly, check your computer's date/time--the animation depends on its accuracy!
• In your browser's Preferences, make sure that JavaScript (or simpley "scripting" is enabled. (Under Netscape's Preferences, this is probably set in the "Advanced" category. In Microsoft's Internet Explorer, try looking in the "Web Browser" section of Preferences, under "Web Content" or "Advanced".)
• If you resize the browser window you might need to press the Reload button or choose Reload from the View menu.

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