| Objective Determination of the Tropopause Using WMO Operational Definitions - :11558 | National Weather Service (NWS)
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Objective Determination of the Tropopause Using WMO Operational Definitions
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    "This Office Note describes a numerical method of objectively determining approximate tropopause pressure and temperature values using only mandatory height and temperature data. The numerical method to be described here is a revised version of the method that is briefly outlined in an article that was presented by W.L. Hughes (Ref. 1) before the International Civil Aviation Organization (ICAO) Area Forecast Panel in Montreal, Canada. The major premise upon which this proposed numerical method rests is the WMO operational definition for the tropopause. That definition states that the conventional tropopause is the lowest level at which the lapse-rate decreases to 0.002 °C/m or less, and the average lapse-rate from this level to any level within the next higher 2000 m does not exceed 0.002 °C/m (Refs. 2-3)"--Introduction.

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