August 4, 2011: Pastcasts now available! Little nubbins in the History/Today/Forecast/Averages header section indicate when there's a pastcast available. Simply click the nubbin to load it. This displays the forecast for the current weather station, as fetched at that point in time, allowing you to see how well the forecasts fare against the actual outcome.
July 28, 2011: Made precipitation amount, precipitation rate, and wind speed plot logarithmically to allow for extreme values while still keeping the graph sane. Added submenus to the Select Graphs... menu to allow configuration of per-graph settings. More UI tweaks and minor bug fixes.
July 27, 2011: A bunch of minor bugfixes and minor UI updates.
June 28, 2011: Extended historical radar to include back to the beginning of 2007. Improved the map sun indicator to include sunset & sunrise.
June 27, 2011: Added map sun indicator. Added a drop shadow to the radar image and improved the map pan-performance when showing the radar image.
June 22, 2011: Made radar more up to date (now only 5 minutes back if possible, used to be a 10 minute delay) and switched the default map type to the terrain map instead of the plain one. Added sunrise/sunset time indicators to the sun graph (and the temperature graph when the sun trace is added to it).
June 21, 2011: Added wind arrows to the map, added optional dew point and sun traces to the temperature graph, added optional temperature trace to dew point graph. Added current conditions to the map station tool tip. Added map type option (plain and terrain). Several small bug fixes.
June 16, 2011: Added a video tutorial.
June 8, 2011: Added animation of the data shown in the weather stations, expanded the series that can be shown on the map to include dew point, pressure, and humidity, and extended the animation range to include 2009.
So when playing the radar animation, the corresponding value for each weather station is also shown. This makes for some really cool animations: see how the temperature is suppressed by the rain and how the high & low pressure zones move with the storms!
You can easily select a time slice for animation by holding down shift while clicking and dragging in the graph. A faint line in the graph indicates what time slice is currently shown on the map.
Also added full-screen mode. Full-screen mode disables sleep mode, so if you want to keep the application running indefinitely you can now easily do that.
June 2, 2011: Added a new forecast source: Weather Central (WXC). Some design updates and a new dashboard tab.
May 23, 2011: Front page redesign: cleaned it up & styled it a bit.
May 17, 2011: Animated radar added. You can view up to 5 days of continuous radar animation for the conterminous United States (CONUS) and Hawaii, and the history currently goes back to the beginning of 2010 for CONUS (sadly we only have recent radar images for Hawaii). We're working on extending the historical coverage.
May 4, 2011: Simple forecast tab added. It's not the default tab yet as we're still experimenting with it - feedback encouraged! We've also added the forecasted amount of precipitation (as opposed to just the probability of precipitation).
March 31, 2011: Big update: we're now in the Chrome App Store, have per-graph unit customization (click the drop-down button next to F|C up right), and several new graphs: dew point, humidity, and two more for precipitation. Enjoy!
March 23, 2011: We're relocating our offices - please pardon any delays in responding to feedback this week. We're very excited about all the new visitors, and can't wait to roll out new features to the site!
March 18, 2011: Weather reports are now back online with a very scalable backend, so check out e.g. San Francisco on March 16.
March 16, 2011: Lots of excitement on LifeHacker via Kottke! Unfortunately our current weather report backend didn't quite scale enough to meet demand, so we've had to temporarily disable them. Will get them back as soon as we can!
March 16, 2011: Introducing weather reports! These are in-depth printable descriptions of the weather in any location on any day of the year. Currently text only, graphs will be forthcoming. Check out San Francisco on March 16, or why not Honolulu?
March 11, 2011: Servers are holding up, and we have been making a lot of little behind-the-scenes updates to keep the system running smoothly in the face of ramping traffic (nothing like patching your web framework in the middle of a traffic spike to make it deal with proxy caching correctly ;). We're very excited about the user response - you rock! And keep the feature requests & bug reports coming - sorry for any delays in responding, we're working as hard as we can.
March 7, 2011: You can now compare multiple locations to each other and have the graphs overlaid. Check out San Francisco vs New York. Just hold down shift when clicking on a station or when pressing enter in the search box. Also works with the list of most recently used stations: just hold down shift while clicking on the link. You can compare up to four locations at once (gets a bit cluttered beyond that ;)
March 7, 2011: The current conditions are now promptly updated. The stations report new conditions once an hour, and within just a few minutes of the report the data is available on the site. Thanks everyone who reported the bug in the initial release!