| The hydrostatic checking of radiosonde heights and temperatures. Part II - :11466 | National Weather Service (NWS)
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The hydrostatic checking of radiosonde heights and temperatures. Part II
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  • Description:
    "This Office Note documents improvements to the new NMC hydrostatic check of radiosonde data. It brings up-to-date Office Note 344, in which the basic theory was presented and early results were shown. The hydrostatic check of radiosonde temperatures and heights relies on the redundancy of the data. The radiosonde instrument measures temperatures, and the heights. are determined from the temperatures by use of the hydrostatic equation. There is the possibility to measure the radiosonde height independently, but this opportunity is not presently used. Following the hydrostatic integration, the data are encoded and transmitted as a message. If the heights and temperatures decoded by NMC do not agree hydrostatically within certain limits, the decoded value of height(s) or temperature(s) must be in error. The new hydrostatic check (HSC) inspects the pattern of disagreement numbers, called hydrostatic residuals, to determine the value(s) that is(are) in error, and some new improvements try to determine the most likely original value. The logic of the code has also been improved to try to better handle more complicated error patterns. Recently, a check of the agreement of the low-level mandatory level heights and the reported surface pressure has been added. These improvements and the monitoring system will be described in Section II. The extensive testing of the modifications will be described in Section III. Section IV will present the results of those tests and Section V will detail some specific questions. The final Section VI will describe plans for the future. The HSC was implemented in the FINAL cycle, 4 times a day, beginning December 14, 1988. Following a period of examination and determination of robustness within the NMC operations, the HSC was then implemented into operations at all places where the old hydrostatic check, HYDROCHK, is executed (about 20 per day)"--Introduction.

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