ZCZC HFOTCDCP2 ALL TTAA00 PHFO DDHHMM Hurricane Douglas Discussion Number 30 NWS Central Pacific Hurricane Center Honolulu HI EP082020 1100 AM HST Mon Jul 27 2020 Douglas is experiencing noticeable wind shear this morning, with deep convection limited to the northeast quadrant of the circulation. Satellite presentation continues to erode, with the low level circulation center just inside the southwest edge of this deep convection, leaving the rest of the circulation exposed. Initial six hour motion is 270/17 kt, reflecting either a 12Z motion which was too slow or stronger low level steering as this system decouples. This motion is slightly left of the previous forecast track and was incorporated into the reasoning for the current track. Subjective Dvorak satellite intensity estimates from all the national centers are 4.0/65 knots, while UW-CIMSS ADT is 61 knots. Given these estimates and the gradual deterioration in satellite presentation overnight, initial intensity is set at 70 kt, a decrease in 10 kt from the last package. Douglas continues to be steered by a deep ridge to its north and the expectation is for this system to continue on a west to west northwest track through the remainder of its life. With 20 to 25 kt of shear forecast through 48 hours, significant weakening is also expected. The updated track forecast is slightly to the left of the previous one, given short term motion. This is still within the northern portion of the guidance envelope, closest to the HCCA consensus track. Like last time, the intensity forecast leans heavily on the dynamical models, anticipating a fairly rapid rate of weakening. FORECAST POSITIONS AND MAX WINDS INIT 27/2100Z 23.0N 162.2W 70 KT 80 MPH 12H 28/0600Z 23.1N 165.4W 65 KT 75 MPH 24H 28/1800Z 23.5N 169.3W 55 KT 65 MPH 36H 29/0600Z 23.8N 173.1W 50 KT 60 MPH 48H 29/1800Z 24.3N 176.8W 40 KT 45 MPH 60H 30/0600Z 24.9N 179.3E 35 KT 40 MPH 72H 30/1800Z 25.2N 175.3E 30 KT 35 MPH...POST-TROP/REMNT LOW 96H 31/1800Z...DISSIPATED $$ Forecaster Powell NNNN
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