Blended TPW conveys no information on the vertical distribution of moisture, which is relevant to a variety of forecast concerns. A blended seven-satellite, four-layer, layered water vapor product developed by CIRA allows forecasters to see the vertical distribution of water vapor in near real-time. This product is called blended Layered Precipitable Water (LPW) and consists of four tropospheric layers of water vapor. Blended LPW is created by using NOAA investments in polar orbiting satellite sounding retrievals from passive microwave radiances, in particular, the Microwave Integrated Retrieval System (MiRS). Data from the Suomi-NPP, NOAA-18 and -19, Metop-A and –B, and Defense Meteorological Program (DMSP) F17 and F18 spacecraft are merged to create the LPW product. The NOAA Joint Polar Satellite System Proving Ground and Risk Reduction program supports the development of advanced blending algorithms and the distribution of the product to NOAA national centers.
Examples of forecast usage and animations of the total and layered precipitable water products will be presented. Interactions with the National Hurricane Center (NHC) and the Weather Prediction Center (WPC) will be discussed.