by Dept. of Commerce, National Oceanic and Atmospheric Administration, [Office of Oceanic and Atmospheric Services], National Weather Service in Silver Spring, Md .
Written in English
|Statement||Julius Badner, Meteorological Services Division|
|Series||NOAA technical memorandum ; NWS FCST-23|
|Contributions||United States. National Weather Service. Meteorological Services Division|
|The Physical Object|
|Pagination||ii, 57,  p. :|
|Number of Pages||57|
Wind shear affects sailboats in motion by presenting a different wind speed and direction at different heights along the mast. The effect of low level wind shear can be factored into the selection of sail twist in the sail design, but this can be difficult to predict since wind shear may vary widely in . A low-level windshear alert system (LLWAS) measures average surface wind speed and direction using a network of remote sensor stations, situated near runways and along approach or departure corridors at an airport. Wind shear is the generic term for wind differences over an operationally short distance (in relation to flight) which encompass meteorological phenomena including gust fronts. Thunderstorms produce convective wind shear, which is short-lived, and localized –Microbursts (FAA may refer to this as ground-based wind shear) Non-convective wind shear is longer-lived and on a larger scale –LLWS not associated with a thunderstorm –Low-level jet (often occurs in morning-nocturnal) WS in TAF –non-convective wind shear. LOW-LEVEL WIND SHEAR. Wind shear is a change in wind speed and/or direction over a short distance, which results in a tearing or shearing action. Although wind shear can occur at any altitude, it is particularly hazardous when it happens over a short period of time and within 2, feet of the ground, during takeoff or landing.
Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. Scott: “A forecast for non-convective low level wind shear (LLWS) is perhaps one of the most misunderstood aviation weather forecasts. Understandably so; a pilot hears the term wind shear and immediately jumps to the conclusion that severe turbulence is likely. It’s a common misconception, but non-convective low level wind shear is not a forecast for . Oct 07, · Wind shear is defined as a marked change of wind speed and/or wind direction over a horizontal plane or within a vertical depth of the atmosphere. When the wind shear occurs near the surface, it is referred to as low-level wind shear and abbreviated LLWS. Low-Altitude Wind Shear and Its Hazard to Aviation Report of the Committee on Low-Altitude Wind Shear ant! Its Hazarc! to Aviation A Joint Study Commission on Engineering ant} Technical Systems Aeronautics and Space Engineering Boars!
Get this from a library! Low-level wind shear: a critical review. [Julius Badner; United States. National Weather Service. Meteorological Services Division,]. Sep 05, · The best antidote to wind shear, however, is a good forewarning. If forecasts mention low-level wind shear, be prepared for a go-around and carry extra airspeed on final approach. The usual recommendation is to add one-half the gust factor to your usual, V SO approach speed. So if the wind is 10 gusting to 20 knots, add 5 knots to your. Sep 22, · Low-level (low-altitude) wind shear can be expected during strong temperature inversions, on all sides of a thunderstorm and directly below the cell. A pilot can expect a wind shear zone in a temperature inversion whenever the wind speed at 2, feet . The results of studies of wind shear hazards to aircraft operation carried out under NASA Marshall Space Flight Center contract for the period through are summarized in this report.