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Subtropical Storm Wanda 2021

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Satellite images and tracking maps of Subtropical Storm Wanda 2021, October 25 - November 8. Max wind speed 50mph.

Wanda is no longer generating deep convection in association with its low-level circulation. In fact, most of the colder cloud tops seen on satellite over the center right now are actually upper-level cirrus associated with a cold frontal boundary part of a larger mid-latitude cyclone southeast of Greenland. In addition, an 11:56 UTC ASCAT-B pass over Wanda's circulation shows that the north side is beginning to open up into a trough as the cold front is encroaching on the system. These above factors suggest that Wanda is no longer a tropical cyclone, and the system is now classified as a post-tropical low as of this advisory. The winds remain 35-knots based on the peak wind retrieval of 33-knots from the scatterometer data on the southeast side of the circulation.

The system has been accelerating to the northeast with the latest estimated motion at 045/22 knots. The post-tropical cyclone should continue to accelerate to the northeast until it merges with the baroclinic zone approaching it. A 12 hour point is provided for continuity and to indicate the transition to an extratropical cyclone, though its quite possible the system will be fully absorbed by the frontal boundary by then. The track guidance at 12 hours is tightly clustered, and the NHC track forecast at that time fame follows the consensus aids closely.

This is the last NHC advisory on Wanda. Additional information on this system can be found in High Seas Forecasts issued by Meteo France under WMO header FQNT50 LFPW and available on the web at https://www.meteofrance.com/previsions-meteo-marine/bulletin/grandlarge/ metarea2.

Forecaster Papin. Information provided by the National Hurricane Center (NHC).