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NRCS Streamflow Volume Forecasts (Pacific Northwest)

Official NRCS seasonal streamflow volume forecasts at HUC 17 forecast points, including the Columbia at Grand Coulee and The Dalles, every exceedance level and issuance, publications back to 1938.

NRCSHydrology dataBPA market
Query with the agent
Native record
point x publication x period x exceedance
semi-monthly (Jan-Jun) publication cadence
Evidence
Forecast data
Forward-looking values with an explicit issue time
Time basis
Point-in-time records
UTC · event_time

Overview

Official NRCS seasonal streamflow volume forecasts at HUC 17 forecast points, including the Columbia at Grand Coulee and The Dalles, every exceedance level and issuance, publications back to 1938.

Query contract

Preserve one canonical row per (station_triplet, element_code, publication_date, issue_date, forecast_period, exceedance_probability) before aggregating.

Analysis rules

  • % of normal is the 50% exceedance value / period_normal.

Access

Query from your own tools

Use the guarded HTTP endpoint directly, or connect an MCP client and load the dataset contract with describe_data before calling query_data.

BPA MCP API reference
HTTP endpoint
POST /api/v1/datasets/nrcs_snotel_streamflow_forecasts/query

Schema15

Column
Type
event_timeDateTime64(6, 'UTC')
station_tripletLowCardinality(String)
forecast_point_nameNullable(String)
element_codeLowCardinality(String)
publication_dateDate32
issue_dateString
forecast_periodLowCardinality(String)
forecast_period_beginLowCardinality(Nullable(String))
forecast_period_endLowCardinality(Nullable(String))
exceedance_probabilityInt32
valueNullable(Float64)
unitLowCardinality(Nullable(String))
period_normalNullable(Float64)
forecast_statusLowCardinality(Nullable(String))
ingested_atDateTime64(6, 'UTC')

Sample data

No preview available.

Coverage

No time-indexed data — coverage isn’t applicable to this dataset.