Location of Jet Maxima

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  • 1 USAF, Centralized Forecast Facility, Kansas City, Missouri'
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In cases of strong winds aloft, the upper-air wind reports are often erratic and unreliable and frequently do not extend to the level of the jet-stream core. The jet maxima shown at standard levels on conventional constant-pressure charts are more likely to be reflections of the “true” jet maximum which is located between the standard levels. Since the temperature reports of upper-air observations are reliable and available in most cases, a method is introduced which utilizes the temperature soundings to determine the location of the jet maxima. The “true” jet maxima can then be identified by barometric pressure height, temperature, thermal wind shear, and velocity.

In cases of strong winds aloft, the upper-air wind reports are often erratic and unreliable and frequently do not extend to the level of the jet-stream core. The jet maxima shown at standard levels on conventional constant-pressure charts are more likely to be reflections of the “true” jet maximum which is located between the standard levels. Since the temperature reports of upper-air observations are reliable and available in most cases, a method is introduced which utilizes the temperature soundings to determine the location of the jet maxima. The “true” jet maxima can then be identified by barometric pressure height, temperature, thermal wind shear, and velocity.

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