ZCZC HFOTCDCP3 ALL TTAA00 PHFO DDHHMM Post-Tropical Cyclone Miriam Discussion Number 31 NWS Central Pacific Hurricane Center Honolulu HI EP152018 1100 AM HST Sun Sep 02 2018 Under continued strong vertical wind shear of 45 to 55 kt, limited amounts of deep convection have been displaced well to the north of the exposed low-level circulation of Miriam for about 24 hours. HFO and SAB deemed the system too weak to classify. JTWC gave a Dvorak current intensity of 1.0/25 kt, and CIMSS ADT yielded an estimate of 1.5/25 kt. An overnight ASCAT pass from 0658Z showed a large area of 30 kt wind retrievals and one near 35 kt. Based on these inputs, Miriam will be designated a post-tropical low with an intensity of 30 kt, and this will be the final advisory for this system. Miriam is moving toward the northwest (310 degrees) at 10 kt. This general motion will continue over the next day or so as a deep ridge holds to the northeast and a mid- to upper-level trough remains parked to the northwest. This trough will maintain strong southwesterly vertical wind shear that will inhibit redevelopment of the system, and the post-tropical remnant low should open into a trough on Monday. The track and intensity forecasts are in the middle of their guidance envelopes near TVCE and ICON, respectively. FORECAST POSITIONS AND MAX WINDS INIT 02/2100Z 26.4N 144.6W 30 KT 35 MPH...POST-TROPICAL 12H 03/0600Z 27.3N 146.1W 25 KT 30 MPH...POST-TROP/REMNT LOW 24H 03/1800Z 28.2N 148.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 04/0600Z...DISSIPATED $$ Forecaster Wroe NNNN
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