Phased array radar beams can be directed and controlled to continuously scan severe storms.
BOULDER, Colorado — When a tornadic supercell thunderstorm forms on the eastern plains of Colorado, meteorologists use a Doppler radar to get critical scans and analyze the storm’s dangerous potential.
“We know tornadic storms can evolve rapidly, so six minutes is like an eternity for a tornado forecast,” said Wen-Chau Lee, a senior research scientist at the National Center for Atmospheric Research . . It's actually been used by the military for decades to detect enemy missiles and operatives, but it has not yet been applied to the weather community.
“The phased array radar can focus on a specific feature rather than to scan around and around and around in order to sample that feature,” Lee said."So it allows you to capture a more complete picture of storm formation, and drastically reduces the time it takes to do it." He said another capability of phased array radar is something called dual polarization scanning. It allows meteorologists to see the three-dimensional microphysics of cloud particles. Ground-based Doppler has that ability, but radar beams lose some of their integrity with distance.
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