15th anniversary of publication of seminal work on wind profiles in the tropical cyclone eyewall from dropwindsondes

Starting in 1996, NOAA phased out use of the obsolete Omega DropWindsondes (ODW) in favor of the Global Positioning Satellite (GPS) Dropwindsondes.  In addition to being more accurate due to the superior navigation system, this next-generation sonde was also more moisture tolerant.  ODWs would fail in they were launched in areas of heavy rain, but …

20th anniversary of the first ever dropwindsonde observation in a hurricane eyewall

For decades, meteorologists used dropwindsondes, weather instrument packages deployed from aircraft, to make atmospheric soundings below flight level.  Starting in the 1970s they used Omega dropwindsondes (ODWs) that employed the very low-frequency Omega navigation signals to estimate the ODW's motion relative to the aircraft, and subsequently calculate the wind.  Because of the limitations of this system, …