This sources sought notice is for market research only and does not constitute a solicitation, issued by NOAA to identify capable sources. The requirement involves developing an FVCOM-ERSEM model of Lake Erie to simulate harmful algal blooms and hypoxia over 2014-2020, including phytoplankton composition, nutrient budgets, and pH. A firm-fixed-price purchase order is anticipated with a one-year period of performance starting on 18 September 2026. The applicable NAICS code is 541990 with a $19.5 million size standard, and interested parties must be registered in SAM. Responses will inform competition and set-aside decisions, and the government may use provided information in a future solicitation.