On September 23, a surface trough formed in conjunction with an upper-level low that was producing a huge area of scattered thunderstorm activity in an arc east and south of Bermuda. The system consolidated some over the following day as it moved generally northward and a well-defined surface center appeared north of Bermuda. The island experienced only minor impacts as the disturbance passed near it. There was some deep convection too, though it was generally located north and east of the center of circulaton. The storm was non-frontal. However, it was still located under an upper-level low and furthermore did not look much like a conventional tropical storm: thus, it was classified Subtropical Storm Teresa. Teresa was the second earliest nineteenth named storm (typically, "T" storm) on record, after only Teddy of 2020.
The storm's genesis was not well-anticipated, and it only had a small window for intensification, as a powerful extratropical low was forming near New England. Teresa was heading northwest initially, and then turned north and then northeast as it became caught up in the low. Increasing shear overwhelmed the storm and it became post-tropical on September 25. The low lost its identity soon after.
Teresa's satellite presentation looks distinctly subtropical, with little convection near the center and an asymmetric appearance.
Teresa added to the list of short-lived cyclones of the 2021 season.
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