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Post-Tropical Cyclone Nine-E Forecast Discussion Number 7
2021-08-01 10:39:01| National Hurricane Center (East Pacific)
Issued at 1100 PM HST Sat Jul 31 2021 000 WTPZ44 KNHC 010838 TCDEP4 Post-Tropical Cyclone Nine-E Discussion Number 7 NWS National Hurricane Center Miami FL EP092021 1100 PM HST Sat Jul 31 2021 The depression has remained poorly organized for more than 24 hours and has produced a very limited amount of convection during that time. As a result of the lack of organized deep convection over the past day, the system no longer meets the definition of a tropical cyclone, and it has degenerated into a remnant low. In addition, the original low-level swirl that was tracked over the past day or so appears to have been absorbed within the envelope of the broader low pressure area. The system's initial intensity is maintained at 25 kt, but this could be generous. The depression has been plagued by shear and dry air entrainment, and those conditions are expected to persist for at least the next couple of days. If the system is able to survive past 72 hours, there is some chance of redevelopment when the shear decreases later in the period. However, given the uncertainty surrounding the potential interaction with Hurricane Hilda located to the cyclone's northeast, the official forecast calls for the system to remain a remnant low, and this will be the final NHC advisory on this system unless regeneration occurs. The cyclone has been nearly stationary overnight, but it is forecast to begin a slow westward to west-northwestward motion later today, and that motion should continue for the next few days. After that time, possible interaction with Hilda increases the track forecast uncertainty, but since the majority of the dynamical models keep the low on a west-northwestward heading, so does the NHC forecast. Future information on the remnant low can be found in High Seas Forecasts issued by the National Weather Service, under AWIPS header NFDHSFEPI, WMO header FZPN02 KWBC, and on the web at ocean.weather.gov/shtml/NFDHSFEPI.php Information on potential regeneration will be available in the Tropical Weather Outlook as needed. FORECAST POSITIONS AND MAX WINDS INIT 01/0900Z 11.4N 127.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 12H 01/1800Z 11.8N 128.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 24H 02/0600Z 12.0N 129.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 02/1800Z 12.3N 131.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 03/0600Z 12.7N 132.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 03/1800Z 13.1N 134.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 04/0600Z 13.5N 135.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 05/0600Z 14.5N 137.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 06/0600Z 15.5N 140.5W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Brown
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