Objective Diagnosis of Binary Tropical Cyclone Interactions forthe Western North Pacific Basin

Lester E. Carr III Department of Meteorology, Naval Postgraduate School, Monterey, California

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Russell L. Elsberry Department of Meteorology, Naval Postgraduate School, Monterey, California

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Abstract

Objective criteria for distinguishing among three modes of binary tropical cyclone (TC) interactions (TCI) are defined and tested with an eight-year sample of western North Pacific TCs. These objective criteria lead to an approximate 4:1 ratio of hits to misses of the subjectively assigned TCIs. False alarm rates of approximately 20% are also found, which indicate that similar track deflections may occur for other reasons, and the objective identifications must still be carefully validated by a forecaster.

Corresponding author address: L. E. Carr, Department of Meteorology, Naval Postgraduate School, Code MR/Cr, 589 Dyer Rd., Monterey, CA 93943-5114.

Email: carrle@nps.navy.mil

Abstract

Objective criteria for distinguishing among three modes of binary tropical cyclone (TC) interactions (TCI) are defined and tested with an eight-year sample of western North Pacific TCs. These objective criteria lead to an approximate 4:1 ratio of hits to misses of the subjectively assigned TCIs. False alarm rates of approximately 20% are also found, which indicate that similar track deflections may occur for other reasons, and the objective identifications must still be carefully validated by a forecaster.

Corresponding author address: L. E. Carr, Department of Meteorology, Naval Postgraduate School, Code MR/Cr, 589 Dyer Rd., Monterey, CA 93943-5114.

Email: carrle@nps.navy.mil

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