definition from WU
Posted by
cypresstx on 8/7/2018, 1:07 pm
https://www.wunderground.com/hurricane/subtropical.asp
If the waters under the extratropical cyclone are at least 21C (70F), thunderstorm activity will gradually build inside the storm and moisten and warm the lower levels. Over time, the core of the storm may gradually go from cold to warm, and the storm will start getting some of its energy from "latent heat", which is the energy released when water vapor that has evaporated from warm ocean waters condenses into liquid water. Latent heat is what powers tropical cyclones. At this point, the storm is called subtropical. If the winds are already more than 39 mph (as happened in the case 2007's Subtropical Storm Andrea), it is called a subtropical storm. If the winds are less than 39 mph, then it is called a subtropical depression. So, you don't need to start with a subtropical depression in order to get a subtropical storm.
tool from a link in the article: http://moe.met.fsu.edu/cyclonephase/index.html |
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