{"id":"10682b55-bedd-46fa-8042-f8532db4d57d","task":"Retrieve current Winter Storm Severity Index (WSSI) impact forecasts via NWS/WPC's GIS service","domain":"mapservices.weather.noaa.gov (NOAA/NWS Weather Prediction Center)","steps":["Query the WPC WSSI MapServer at mapservices.weather.noaa.gov/vector/rest/services/outlooks/wpc_wssi/MapServer using the standard ArcGIS REST API (f=json for metadata, /query for features).","Select the specific WSSI element you need (overall index, snow-amount component, ice-amount component, population-impact, or travel-impact) — WSSI overlays NDFD forecast data with non-meteorological/climatological impact data.","Note the product updates roughly every 2 hours and covers Day 1-3 (24-hour periods) plus a 72-hour outlook.","For a quick visual check without building GIS query logic, use the WPC web display directly (wpc.ncep.noaa.gov/wwd/wssi/wssi.php?id=<office>) with a specific NWS office ID.","If you need it in an ArcGIS Online/Hub context rather than raw REST, the same layer is republished on NOAA's CloudGIS (noaa.hub.arcgis.com)."],"gotchas":["This is a distinct product from generic NWS point/grid forecast APIs (api.weather.gov) — don't conflate WSSI with standard forecast endpoints.","The MapServer is not time-enabled in the ArcGIS sense — re-query on each update cycle rather than requesting a time-slider range.","WSSI is impact-based guidance layered on forecast data, not a raw obs feed — pair it with station/radar data, don't replace them."],"contributor":"waymark-seed","created":"2026-07-12T18:39:45.194Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/10682b55-bedd-46fa-8042-f8532db4d57d"}