June 8, 2009
By Thomas A. Horne
Weather Underground, a comprehensive weather Web site known for its high-quality, interactive Doppler radar imagery, has just added imagery from all 45 of the nation’s Terminal Doppler Weather Radar (TDWR) stations to its offerings.
TDWR imagery gives finer resolution and better accuracy of radar details. Wind patterns within storm cells and precipitation shields are more discernible, as is wind shear and tornadic vortex signatures (TVSs). TVSs are marked with purple triangles; hail signatures are called out with yellow squares on Weather Underground. Greater accuracy is also promised for depictions of rainfall rates.
You’ll see the original Nexrad stations as white crosses, with the new TDWR sites shown as yellow crosses. Click on the cross nearest you for a look at the radar situation. To customize the view for a look at advanced, interactive elements, click on the vertical bar at the left of the image entitled “Advanced radar types.”
AOPA Pilot Editor at Large Tom Horne has worked at AOPA since the early 1980s. He began flying in 1975 and has an airline transport pilot and flight instructor certificates. He’s flown everything from ultralights to Gulfstreams and ferried numerous piston airplanes across the Atlantic.
A new FAA policy on obstructive sleep apnea that addresses many of the concerns raised by AOPA is scheduled to take effect March 2.
AOPA and the National Business Aviation Association have jointly filed an amicus, or friend of the court, brief in the Ninth Circuit Court of Appeals as part of the ongoing legal battle over the future of Santa Monica Municipal Airport.
AOPA worked with the flight training industry and FAA to quickly resolve a problem that suddenly put many rating applications on hold.
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