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"SFMR Peak (10s Avg.) Sfc. Wind" is divided by the "Peak (10 sec. Avg.) Flight Level Wind" and multiplied by 100 when both are available and not suspect to obtain the comparative percentage of 10 second SFMR estimated surface wind gusts to 10 second flight level wind gusts. This will allow you to get an idea of an appropriate reduction factor to use in other observations for that region of the storm and for that aircraft pressure level. With that reduction factor we can multiply the 30 second sustained flight level winds in order to get an estimate of the 30 second sustained surface winds.
These are Tropical Atlantic calculations that are not based on any official method. You may find this page from the National Hurricane Center helpful: Eyewall Wind Profiles in Hurricanes Determined By GPS Dropwindsondes. However, keep in mind that SFMR is not directly measured. The estimated 30 second surface wind speed calculation depends on the SFMR instrument having reported the highest winds accurately. While suspect data is noted, it is definitely possible that the highest winds were not noted. For this reason, the estimated 30 second sustained surface wind may be under reported due to this reason.
Our site also displays the storm status, such as a tropical storm or which category of hurricane. This information is not entirely accurate since the Saffir-Simpson Hurricane Scale is based on 1 minute surface sustained winds rather than the 30 second surface sustained winds we report in the decoder output.
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