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Experimental cross section weather product has new features

A typical cross section shows vertical cloud extent, and cloud type (ice, supercooled, etc.). Areas where satellite coverage is missing for that segment are displayed in light gray. Graphic courtesy of CIRA/Colorado State University.

The Vertical Cloud Cross-Section home page shows the latest satellite coverage over Alaska. Click on the Latest Loop button to see recent passes to understand the limits of coverage, as well as watch weather features move across the state. Graphic courtesy of CIRA/Colorado State University. Image sensors on National Oceanic and Atmospheric Administration polar-orbiting Joint Polar Satellite System (JPSS) satellites are making it possible to create higher resolution products, especially in high-latitude places like Alaska. A NOAA-funded project at CAU’s Cooperative Institute for Research in the Atmosphere has integrated data from the JPSS satellites to create a very different kind of experimental aviation weather product. Instead of a 2D map showing the areal extent of weather (areas of VFR, MVFR, IFR for example), this product depicts a vertical cross-section along a flight route.

New feature

The first generation of the product was limited to fixed routes, such as Juneau to Anchorage. After receiving feedback from users, the development team has given the product a new look, and more importantly, has added the ability for users to create custom routes, defined either by typing in a list of airport codes, or by using a drag and drop method, if where you plan to fly doesn’t have an airport. It also allows the user to define a multi-leg route. If you haven’t yet tried this product, please give it a look.

I find it helpful, before looking at a cross-section, to click the “latest loop” button on the home page and step through the satellite passes that cover Alaska. This shows what areas have recent satellite coverage and is useful for watching cloud patterns to see which way weather systems are moving.

Limitations

Unlike geostationary satellites, which image an entire hemisphere at a time but don’t cover the high latitudes very well, the JPSS satellites orbit from pole to pole, imaging an 1,800-mile-wide swath of the Earth’s surface as they fly by about 500 miles overhead. Consequently, depending on the exact route you plan to fly, there may not be complete coverage during a specific orbit. Users may examine cross sections during several satellite passes, looping between them to look for trends. At times, you will find a portion of your prescribed route is not covered. In this case, light gray shading indicates that data is missing for that portion of the route. Clicking through the image slider will display past cross-sections, allowing users to watch how conditions are changing. The CVC is derived from complex satellite products. To understand the sources of information that go into making it, check out the reference documents, available from links at the top of the homepage.

User feedback needed

The development team has been very responsive to feedback and has adapted the product by adding graphic pilot reports, freezing levels, and other features along the route segments. After using the product for a while, please take the user survey (link at the top of the homepage) to describe how you use the product, what you like, and what you might like to see changed. This helps the science team understand what is needed to make this product more useful for flight planning proposes. Your feedback is a vital part of making this an operational product in the future.

By AOPA Alaska Regional Manager Tom George

A custom flight path, in this case from Fairbanks to Lake Minchumina and McGrath (PAMC). Graphic courtesy of CIRA/Colorado State University.

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