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Tropical Storm Kiko Forecast Discussion Number 28
2019-09-19 10:49:31| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Thu Sep 19 2019 000 WTPZ43 KNHC 190849 TCDEP3 Tropical Storm Kiko Discussion Number 28 NWS National Hurricane Center Miami FL EP132019 200 AM PDT Thu Sep 19 2019 Water vapor satellite imagery as well as satellite-derived winds indicate that there is some southwesterly shear undercutting Kiko tonight, with a large upper level trough digging several hundred miles to the northwest of the cyclone. This flow is likely feeding some dry air into the system, and these factors could explain why Kiko has not been intensifying recently. The objective Dvorak estimate from TAFB as well as subjective intensity estimates suggest that the initial advisory intensity remains at 55 kt. Despite the forecast for shear to be generally relaxed, Kiko will have to overcome dry and stable air to its north and west that may keep entraining into the cyclone's circulation in the coming days. The majority of the intensity guidance only show some slight strengthening over the next several days. And, due to the mixed positive and negative signals for intensification, the official forecast agrees with this scenario and gradually brings Kiko to hurricane strength in about 36 hours, and intensifies it just a little more after that time. The official forecast intensity is very near the HFIP corrected consensus HCCA. The initial motion is westward at 5 kt. A developing weakness in the ridge to the northwest of Kiko will allow for a west-northwest to northwest motion over the next couple of days. Ridging will rebuild to the northwest of Kiko after that time, which will induce a west-southwestward motion. Late in the forecast period, that ridge will weaken, resulting in a turn back to the northwest. The main change to the official forecast track was to nudge it a little to the right, as the well performing ECMWF has shifted quite a bit northward on the latest run. The official forecast now lies on the southern edge of the clustered consensus guidance. FORECAST POSITIONS AND MAX WINDS INIT 19/0900Z 15.9N 128.2W 55 KT 65 MPH 12H 19/1800Z 16.1N 128.9W 55 KT 65 MPH 24H 20/0600Z 16.6N 129.7W 60 KT 70 MPH 36H 20/1800Z 17.3N 130.4W 65 KT 75 MPH 48H 21/0600Z 17.7N 131.1W 65 KT 75 MPH 72H 22/0600Z 17.1N 132.9W 70 KT 80 MPH 96H 23/0600Z 16.3N 135.4W 75 KT 85 MPH 120H 24/0600Z 17.6N 137.5W 70 KT 80 MPH $$ Forecaster Latto
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