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Sunday, August 2, 2020 | History

2 edition of meteorological analysis of clear air turbulence found in the catalog.

meteorological analysis of clear air turbulence

Herman Lake

meteorological analysis of clear air turbulence

a report on the U.S. Synoptic High-Altitude Gust Program.

by Herman Lake

  • 69 Want to read
  • 6 Currently reading

Published by Geophysics Research Directorate, Air Force Cambridge Research Center in Bedford, Mass .
Written in English

    Subjects:
  • Turbulence.,
  • Clear air turbulence.

  • Edition Notes

    SeriesGeophysical research papers ;, no. 47
    Classifications
    LC ClassificationsQC1 .U54 no. 56-201
    The Physical Object
    Paginationiii, 63 p. :
    Number of Pages63
    ID Numbers
    Open LibraryOL6216207M
    LC Control Number56061403
    OCLC/WorldCa8226332

    US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service National Centers for Environmental Prediction Aviation Weather Center NW st Terrace Kansas City, MO Clear Air Turbulence occurs in a Mackerel sky. That’s those high based cirrocumulus clouds roughed up by a jet stream that take on the appearance of fish scales. Then there is turbulence near jet stream cirrus and the back and north side of a developed low pressure called the deformation zone.

    Simultaneous lower atmosphere clear air turbulence analysis by multiwavelength radar, jet aircraft and special rawinsondes Publication Date: Aug Flights of ‘Project Jet Stream’ (–) have been analyzed with respect to various meteorological parameters and clear air turbulence near the jet stream in order to find a method for the prediction of high‐level turbulence in the atmosphere.

    Low-altitude Turbulence Characteristics. Occurs inside the storm. Occurs outside the storm in the clear air. Avoidance Procedure. At low altitudes with wind speeds 15 knots or less a safe distance of 5 nm nm is enough to avoid severe turbulence. For wind speeds greater than 30 knots, go by the standard for high-altitude turbulence. The climtyology of clear-air turbulence is defined herein as the likelihood that an aircraft or missile will encounter turbulent air at a given locality, altitude, and time of year. Turbulence data of three types were used in this study, these include obervations by instrumented.


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Meteorological analysis of clear air turbulence by Herman Lake Download PDF EPUB FB2

CLEAR AIR TURBULENCE. Clear air turbulence is turbulence not associated with cumuliform clouds, including thunderstorms, occurring at or ab feet. Clear air turbulence is not restricted to cloud-free air (75% of all CAT encounters are in clear air).

Get this from a library. A meteorological analysis of clear air turbulence: a report on the U.S. Synoptic High-Altitude Gust Program. [Herman Lake; Air Force Cambridge Research Center (U.S.).

Geophysics Research Directorate.]. Cite this paper as: Mitchell F.A., Prophet D.T. () Meteorological Analysis of Clear Air Turbulence in the Stratosphere. In: Pao YH., Goldburg A. (eds) Clear Air Turbulence and Its by: 3. Clear-air turbulence (CAT) is the turbulent movement of air masses in the absence of any visual clues, such as clouds, and is caused when bodies of air moving at widely different speeds meet.

The atmospheric region most susceptible to CAT is the high troposphere at altitudes of around 7,–12, metres (23,–39, ft) as it meets the tropopause.

Meteorological Analysis of Clear Air Turbulence in the Stratosphere. This paper is presented in two parts. In Part I, prepared by Mr. Mitchell a detailed meteorological analysis of several Project HICAT flights is presented along with some observations and conclusions derived therefrom. Abstract.

It must be recognized that Clear Air Turbulence (CAT) is a smaller scale phenomenon than macro-scale synoptic patterns. It is unlikely that upper air data can be obtained in sufficient detail in either time or space for adequate analysis and forecasting of CAT on a routine basis.

Air turbulence forecasts and maps. Check for turbulence potential before your flight. Pilot Reports; Max Turbulence Potential; Clear Air Turbulence; Storms/Convection; Radar/Echo Tops; Surface Analysis; Surface Winds; Weather Maps; Alaska; Cruise Wave Forecast; mb Analysis; mb Forecast; mb Analysis; mb Analysis; Archive.

Clear-air turbulence (CAT) is small-scale turbulent eddies in the free atmosphere that directly affect cruising aircraft usually in clear sky conditions (Sharman and Lane ).CAT frequently occurs in the vicinity of upper-level jet and frontal systems in which strong vertical wind shear (VWS) leads to Kelvin–Helmholtz instability, which can be quantified by the Richardson number (Ri) (e.g.

Clear Air Turbulence Maps - - Current. About. Need help. Get a forecast by email. This map shows projected turbulence in the US. Current +6 Hours +12 Hours +18 Hours +24 Hours. Air turbulence forecasts and maps. Check for turbulence potential before your flight. At UTC 25 Maya Boeing B aircraft that was en route from London, England, to Los Angeles, California, encountered severe clear-air turbulence (CAT) at ~km elevation over the southern tip of Greenland.

Two passengers were seriously injured, and the flight was diverted to Montreal, Quebec, Canada. Clear air turbulence (C-A-T) occurrences over the United States reported by pilots in April are analyzed with reference to weather conditions, wind speed, horizontal and vertical wind shear, thermal stability, and jet stream location and curvature.

Cloud-induced turbulence can occur both within clouds and in the surrounding clear air. Turbulence associated with but outside of clouds is of particular concern because it is more difficult to discern using standard hazard identification technologies (e.g., satellite and radar) and thus is often the source of unexpected turbulence encounters.

ANALYSIS OF CLEAR AIR TURBULENCE DATA FOR MARCH DeVER COLSON. DeVER COLSON U.S. Weather Bureau, Washington, D.C. Search for other works by this author on: and for varying values of such meteorological parameters as vertical and horizontal wind shear, location and intensity of jet stream, wind speed, temperature and height of tropopause.

Meteorological phenomenon are often categorized, examined, and forecasted according to their average horizontal size and life span. Ordered from minimum to maximum spatiotemporal scale, the three major classes of weather systems and processes are microscale, mesoscale, and macroscale.

Thunderstorms, cumulonimbi, clear-air turbulence, heat. This technical note is a compilation of the latest clear air turbulence(CAT) forecasting techniques used by AFGWC forecasters. It is a comprehensive treatment of a complex and unique forecasting subject.

The methods are relatively easy to follow and are a step-by-step approach to forecasting this weather. 74 monthly weather review february 1b63 yb form u. ment of couuerde 2 - 61 ulaircp hurepll clear air turbulence report ( or above) type of aircrift oate (day.

month h year) from to route t iprincipal checr points i v route altitude profile (thousands of feet msl> i i i 1 3eparture time arrival time gmt gmt. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): A special intensive collection of complete flight data for flights ab ft.

MSL furnished detailed data on areas of non-occurrence as well as areas of occurrence of high level turbulence during a selected 5-day period in March The data were tabulated by ” latitude-longitude “squares. No, we're not gluttons for punishment; however, the turbulence Imagery in ForeFlight Mobile has just gotten way better.

Forecasts now go out beyond 12 hours to include lead times of 15 and 18 hours. This is a significant improvement to NOAA's Graphical Turbulence Guidance (GTG-3) product that now includes an analysis and forecast for clear air turbulence as well as.

Decoded example: For Atlantic City, N.J., at feet MSL wind from degrees true at 33 knots, temperature 2 degrees Celsius. IN-FLIGHT ADVISORIES warn pilots of potentially hazardous include SIGMETs, CONVECTIVE SIGMETs, AIRMETs, and Center Weather Advisories (CWA).

SIGMETs warn of hazardous conditions of importance to all aircraft i.e. severe icing or turbulence. The study is the first to document a significant increase in wind shear associated with the North Atlantic jet stream, which is a primary cause of clear air turbulence.

It lends support to.A. Turbulence •“Bumpiness” in flight •Four types –Low-level turbulence (LLT) –Turbulence near thunderstorms (TNT) –Clear-air turbulence ab ft (CAT) –Mountain wave turbulence (MWT) •Measured as –Light, moderate or severe –G-load, air speed fluctuations, vertical gust.Report of the national committee for clear air turbulence to the federal coordinator for meteorological services and supporting research.

[Washington, D.C.]: U.S.G.P.O., (OCoLC)