Glossary
NWPS
NWPS (National Water Prediction Service) is NOAA’s presentation layer for river forecasts—often what people mean by “NOAA river forecasts” on inland waters. It complements NWS weather products and USACE pool data.
Published May 16, 2026 · Editorial standards
Why it matters
Rain upstream can arrive at a reservoir days after a sunny afternoon on the pool. NWPS hydrographs help you see that timing on forecast points—not replace the project gauge at the dam.
NWPS vs pool stage
On real lakes
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Lake Marion
/lakes/marion
Track Lake Marion for level trends, inflow context, and how forecasts and gages relate on Lake Insights. Published levels use MSL unless the lake page notes otherwise.
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Piedmont Lake
/lakes/piedmont-oh
Track Piedmont Lake for level trends, inflow context, and how forecasts and gages relate on Lake Insights. Published levels use NGVD29 relative to MSL unless the lake page notes otherwise.
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Arcadia Lake
/lakes/arcadia
Track Arcadia Lake for level trends, inflow context, and how forecasts and gages relate on Lake Insights. Published levels use NGVD29 relative to MSL unless the lake page notes otherwise.
Related terms: NOAA · NWS · Hydrograph · Flood stage · Streamgage
Reference information only. See data sources, editorial standards, or suggest a correction.