910 WTPZ44 KNHC 051437 TCDEP4 Hurricane Bonnie Discussion Number 32 NWS National Hurricane Center Miami FL EP042022 1000 AM CDT Tue Jul 05 2022 Earlier microwave images reveal a well-developed inner core structure with a 10-nm-wide eye, and impressive curved band features in the west and south parts of the cyclone. The surrounding cloud tops have cooled quite a bit during the past few hours, but the eye temperature hasn't warmed that much. The initial intensity is increased to 100 kt for this advisory and is supported by a blend of the Dvorak satellite intensity estimates from TAFB and SAB. It appears as though modest northeasterly shear has begun to restrict the outflow some in the north portion of the cyclone, and this shear is expected to persist during the next 24 hours. Consequently, some fluctuations in strength are possible during the period and the NHC forecast shows a slight increase in intensity in 12 hours in deference to the recent inner core improvement. Afterward, the inhibiting shear should decrease, however,the GFS and ECMWF SHIPS intensity models show the cyclone traversing cooler oceanic surface temperatures and moving into a less favorable thermodynamic surrounding environment. A combination of these negative intensity contributions should cause Bonnie to slowly weaken through the remainder of the period and the official forecast follows suit. Bonnie's initial motion is estimated to be westward, or 280/12 kt. A mid-tropospheric ridge anchored to the north of the cyclone should keep it on a west to west-northwest heading through the entire forecast period. Around mid-period, however, a weakness in the ridge is forecast to develop over the Baja California peninsula, which should temporarily slow Bonnie's forward speed. The track forecast is a little faster than the previous one beyond day 3 and is based on the TVCE multi-model consensus aid. Although the core of Bonnie is expected to remain well south of Mexico, rough surf and the potential for rip currents will continue to affect southwestern Mexico for another day or two. FORECAST POSITIONS AND MAX WINDS INIT 05/1500Z 15.3N 104.3W 100 KT 115 MPH 12H 06/0000Z 15.6N 106.2W 105 KT 120 MPH 24H 06/1200Z 16.0N 108.3W 95 KT 110 MPH 36H 07/0000Z 16.3N 110.4W 90 KT 105 MPH 48H 07/1200Z 16.8N 112.7W 85 KT 100 MPH 60H 08/0000Z 17.4N 115.3W 80 KT 90 MPH 72H 08/1200Z 18.2N 118.4W 75 KT 85 MPH 96H 09/1200Z 19.5N 125.1W 60 KT 70 MPH 120H 10/1200Z 20.4N 131.3W 45 KT 50 MPH $$ Forecaster Roberts