Hook Echo A radar reflectivity pattern characterized by a hook-shaped extension of a thunderstorm echo, usually in the right-rear part of the storm (relative to its direction of motion). Echo Tops The height above ground of the center of the radar beam using the tilt, or scan, that contains the highest elevation where reflectivities greater than 18 dBZ can be detected. Echo Energy back scattered from a target (precipitation, clouds, etc.) and received by and displayed on a radar screen. Derechos include any family of downburst clusters produced by an extratropical MCS, and can produce damaging straight-line winds over areas hundreds of miles long and more than 100 miles across. Stages in the life cycle of a bow echo Derecho (Pronounced day-RAY-cho), a widespread and usually fast-moving windstorm associated with convection. Comma Echo A thunderstorm radar echo which has a comma-like shape. Areas of circulation also can develop at either end of a bow echo, which sometimes can lead to tornado formation - especially in the left (usually northern) end, where the circulation exhibits cyclonic rotation. Damaging straight-line winds often occur near the "crest" or center of a bow echo. Bow Echo A radar echo which is linear but bent outward in a bow shape. This feature is associated withĪ strong updraft and is almost always found in the inflow region of a thunderstorm. Upward into, and is surrounded by, higher reflectivities aloft. Thunderstorm characterized by a local minimum in radar reflectivity at low levels which extends NOAA's National Weather Service - Glossary Bounded Weak Echo Region (BWER) (Also known as a vault.) Radar signature within a
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