Argo probes broadcast surface measurements (among other things) on the worlds oceans, far away from traditional surface observations. Yin et al. (2010) study the assimilation of these measurements in an ocean model, but according to an unsourced remark on Wikipedia:
When a float transmits a profile it is quickly converted to a format that can be inserted on the GTS (Global Telecommunications System). The GTS is operated by the World Meteorological Organisation, or WMO, specifically for the purpose of sharing data needed for weather forecasting. Thus all nations who are members of the WMO receive all Argo profiles within a few hours of the acquisition of the profile..
The ocean model by Yin et al. (2010) is not a weather forecasting model. Are there any operational agencies that actually use Argo probe data for numerical weather prediction? Are there any publications on the impact this has had on forecast skill?