Subtropical storm Theta formed in the Atlantic Ocean early morning 10 November 2020.
01, December 2020
By Mark Higgins (EUMETSAT)
According to the National Hurricane Center, Theta is the record breaking 29th storm of this North Atlantic hurricane season.
Figure 1 shows the storm at 09:00 UTC on 11 November 2020. In this water vapour image the storm is seen as the rotation in the centre.
The National Hurricane Centre chart shows the initial storm location (Figure 2).
This storm formed very late in the hurricane season, and quite far north. It formed in an area of cooler sea surface temperatures, as can be seen in Figure 3.
The warmer waters are shown in red/orange (28-29 degrees), the cooler area (yellow) is still warm enough at 25 degrees to supply energy to sustain the storm.
Theta subsequently since travelled north-east and on 13 November was just off the coast of the Azores (Figure 4).
The season is not yet over (it officially ends on 30 November) - NHC forecasters are monitoring Tropical Depression 31, which is forecast to become a hurricane over the next few days.
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