Live Subsurface data from Roadway Weather Information System (RWIS) sites in Iowa. Any field of NA or 9999 describes an invalid value being sent from sensor and was excluded for this REST service. This data gets updated every 5 minutes. This service feeds Iowa DOT's WeatherView ApplicationThe weather data provided here by the Iowa Department of Transportation only reflects conditions at the specified site. Because of Iowa weather patterns, conditions can vary greatly in a small area; i.e., weather conditions a few miles away from the sensor could be completely different. In addition, failure of the sensors, or the equipment processing the information, may occur and produce unreliable information. Therefore, this information should not be used as the only factor in determining whether to travel in a particular area. The Iowa DOT recommends you check a number of sources, including media weather reports, in making your travel plans.