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Ángel F. Adames and Yi Ming

, with the corresponding increase in height southward toward the Indian Ocean. A low-level westerly jet is seen in the area where the height gradient is strongest. There are also some differences with respect to ERA-Interim. AM4.0 exhibits stronger westerlies that extend farther eastward past the Philippines, and the geopotential height gradient is stronger. The difference in the westerly jet is further shown in Fig. 2 , along with moisture, precipitation, and its variability. Mean precipitation

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Toward a Systematic Evaluation of Warm Conveyor Belts in Numerical Weather Prediction and Climate Models. Part I: Predictor Selection and Logistic Regression Model

Julian F. Quinting and Christian M. Grams

; Methven 2015 ) where it generates anticyclonic PV anomalies (label 3 in Fig. 1 ). When this WCB outflow, along with its diabatically driven divergent flow, impinges on the midlatitude waveguide and jet stream, the waveguide is deflected poleward, and a ridge is built (e.g., Pomroy and Thorpe 2000 ; Grams et al. 2011 ; Teubler and Riemer 2016 ; Bosart et al. 2017 ; Quinting and Reeder 2017 ). This ridge building may trigger the development and downstream propagation of a baroclinic Rossby wave

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