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Ice Free Wind Sensors (IFWS) are part of the sensor array that provides critical wind speed measurements to the National Weather Service (NWS) via the Automated Surface Observing Systems (ASOS). This ... Ice Free Wind Sensors (IFWS) are part of the sensor array that provides critical wind speed measurements to the National Weather Service (NWS) via the Automated Surface Observing Systems (ASOS). This requirement is for IFWS instruments that are compatible with the current ASOS existing infrastructure. The NWS Office of Observations (OBS) is responsible for the operations and maintenance of automated fielded systems that sense the atmosphere in support of surface based Aviation Operations. The ASOS program is an essential, joint mission in support of the NWS, the Federal Aviation Administration, and the Department of Defense. The ASOS is the nation's primary system for collecting and reporting surface-weather observations, primarily at airports in support of aviation operations, as well as weather forecasting and the timely issuance of warnings.