NOAA's Oceanic and Atmospheric Research (OAR) Service Office of Weather and Air Quality (OWAQ), (through the Joint Technology Transfer Initiative (JTTI)) is soliciting proposals to conduct research and development activities related to advancing data assimilation of new observations and data assimilation techniques for convective-scale weather prediction, improving water prediction capabilities through enhancements to National Water Model, improving daily to subseasonal scale prediction of Arctic sea ice, and communicating forecast uncertainty.