The above time series shows GPS PW at Univ. of Arizona versus NWS TWC RAOB PW for July 2013. Note that the new Vaisala RS92 sonde provides data that are much more in agreement with the GPS data. A much improved situation here at Tucson NWS. Every once in a while the new sonde data produce PW values that are a bit higher than GPS values. A complete turn around from the overly dry data before the change.
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