AMSU Product 1 - Total Precipitable Water

Column integrated water vapor amount. The scale is in half inch (12.5 mm) increments from zero to three inches (75 mm). Gray indicates that no retrieval is possible, for example, where heavy rain is occurring. [Retrieved by the NOAA/NESDIS Microwave Sensing Group.]

For More information on these AMSU products see CIRA's AMSU website