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Hurricane Kiko Forecast Discussion Number 20
2019-09-17 10:52:37| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Tue Sep 17 2019 000 WTPZ43 KNHC 170852 TCDEP3 Hurricane Kiko Discussion Number 20 NWS National Hurricane Center Miami FL EP132019 200 AM PDT Tue Sep 17 2019 The northeasterly shear impacting Kiko has still not let up. Satellite imagery shows an irregular shaped central dense overcast with the anvils being forced downshear. A blend of the latest subjective and objective intensity estimates suggest the initial intensity has decreased to 70 kt, and this value may be a little generous based on a recent scatterometer pass. Kiko is moving slowly westward. All of the track guidance indicate that a turn to the west-southwest should be commencing very soon as the cyclone becomes steered by a mid-level ridge to its northwest. This steering pattern should remain in place for the next couple of days, before the ridge weakens and Kiko becomes steered to the west to west-northwest by a ridge to its northeast. Late in the forecast period, a new ridge should develop to the northwest of Kiko, causing another turn to the west-southwest. All the while, the steering currents will be fairly weak, resulting in a slow forward motion for the next several days. The official NHC forecast was adjusted only slightly to the south through 72 hours due to a shift in the consensus aids. The shear is expected to weaken Kiko to a tropical storm later today. By tonight, this shear is expected to diminish, which could allow for some re-strengthening. However, moderately stable air surrounding the system, subsidence from the ridge to the northwest, and marginal sea surface temperatures should keep the strengthening at a minimum before the shear returns in a couple of days. This re-strengthening is forecast by most of the guidance, and although the NHC forecast makes Kiko a hurricane again, the forecast intensity is a little lower than some of the most reliable consensus aids during that time period. Once the shear returns, Kiko is expected to begin weakening once again and should become a tropical storm by 72 hours. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 17.2N 124.7W 70 KT 80 MPH 12H 17/1800Z 16.9N 125.3W 60 KT 70 MPH 24H 18/0600Z 16.7N 126.3W 55 KT 65 MPH 36H 18/1800Z 16.6N 127.3W 60 KT 70 MPH 48H 19/0600Z 16.8N 128.5W 65 KT 75 MPH 72H 20/0600Z 17.5N 129.9W 55 KT 65 MPH 96H 21/0600Z 17.7N 131.0W 50 KT 60 MPH 120H 22/0600Z 17.0N 132.5W 45 KT 50 MPH $$ Forecaster Latto
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