A new generation of weather satellites is making it possible to help Alaska pilots anticipate weather along their route of flight. An experimental Cloud Vertical Cross-Section (CVC) Product shows the estimated extent of cloud cover along a route, as well as whether the clouds contain ice, liquid or supercooled water. These products are available on an experimental basis from September 11th to October 11th. Check them out, and help provide feedback!
Imaging sensors on new NOAA weather satellites are supporting R&D activities by NOAA and Colorado State University’s Cooperative Institute for Research in the Atmosphere to create a number of new weather products for Alaska. While the rest of the country relies primarily on geostationary satellites, parked some 22,000 miles above the equator, they don’t provide very detailed information as you go toward the poles. At Alaska’s latitudes, we are better served with polar-orbiting satellites that make multiple passes per day sweeping over the state a little more than 500 miles overhead, capturing swathes of imagery as they fly by. Image data from these passes are extracted, processed and used to create a new generation of weather products for Alaska. Starting in mid-September, one set of these products is available to users for evaluation.
Cloud Vertical Cross-Section (CVC)Product
Shortly after a satellite passes over a portion of the state, data from the sensors is extracted and processed to created a cross-section product. Four routes that have been defined, to estimate cloud conditions between the cities of Anchorage and Bethel, Fairbanks and Juneau, plus a route from Fairbanks to Barrow (Utqiagvik). With each satellite pass that covers some or all of these routes, a cross-section product is generated and made available through a website:
Navigating the CVC Product
To get a sense of how these products work, click on Pop-up Loop on the Overview with Flight Routes panel. This animated loop will show the progression of satellite passes that covered the state, and which passes cover the defined routes. It also provides a good depiction of the cloud cover over the last day or so. Use the controls on this window to change the animation speed, or to step through individual frames for an overview of weather system motion across the state. Times are listed in both UT and Alaska Daylight Time for your convenience.
Using the Route Product
After pursuing the overview, select a route of interest. Either the HTML5 Loop or the Pop-up Loop launches an animation that steps through the products available for the route you picked. Here too, the animation speed can be adjusted. Or one can hit STOP and step through each frame individually. This product is highly derived and is pulling data from several intermediate products that estimate cloud height, the cloud base, as well as the type of cloud they think will be present (water, ice or supercooled liquid). Notice that at times there is missing data, color coded as light gray. In this case the product is not able to make a prediction. The cross sections also have a backdrop of the terrain along each routes, and an estimate of the freezing level.
How you can help
As described, these are experimental products, and your help is needed to validate them. First and foremost, please file Pilot Reports when you are flying anywhere within 50 miles of these routes. During this experimental period, PIREPs are needed to help the science team learn about their accuracy. Since they forecast the cloud base, as well as top, PIREPs for better than forecast conditions are needed, as well as those associated with icing, and cloud tops. In addition, if you have questions or specific feedback, there is a Feedback link on the site which will put you directly in touch with the researchers involved in this effort.
This is an exciting step forward in providing weather information for aviation. Please try out these new products during the 30 day experiment, and do all you can to help the science team understand how their products are working!