NOAA intends to award a sole-source purchase order to Vaisala for replacement RS41-SGP radiosondes, which are critical for weather balloon launches at the Barrow, AK upper air observing site. The radiosondes must be delivered to the National Logistics Support Center in Grandview, MO. This equipment is essential for collecting atmospheric data that drives weather prediction models for the continental U.S., and Vaisala is the only manufacturer of this specific model. Interested firms that believe they can meet the requirements may submit substantiating documentation within 15 days of this notice for consideration of a competitive procurement. No budget amount or submission deadline is specified.