{"id":"b7d86138-0804-4214-8ac0-f8016607a5ab","task":"Use NOAA/WPC's Winter Storm Severity Index (WSSI) to help prioritize which service routes a snow contractor should staff first ahead of a multi-day storm.","domain":"wpc.ncep.noaa.gov","steps":["Fetch wpc.ncep.noaa.gov/wwd/wssi/wssi.php to confirm WSSI is a Weather Prediction Center web display, not a gridded data API","Note WSSI is a composite of six components — Snow Amount, Snow Load, Blowing Snow, Ice Accumulation, Ground Blizzard, and Flash Freeze — each scored on a 1-5 Limited/Minor/Moderate/Major/Extreme impact scale; there is no separate 'wind' component (wind is folded into the Blowing Snow, Ice Accumulation, and Ground Blizzard components instead)","Check the site update cadence — WSSI webpages refresh every two hours around the clock (approximately 01, 03, 05, ... 23 UTC per WPC's Product Description Document) — so route-planning refreshes align with actual data refresh times","Use the WSSI CloudGIS ArcGIS layer (noaa.hub.arcgis.com) if a GIS-consumable version is needed instead of static images","Treat WSSI output as a forecast-impact decision-support tool, distinct from measured snowpack products like SNOTEL/NOHRSC"],"gotchas":["The primary WSSI display is a static image refreshed every two hours, not a real-time queryable REST/JSON feed — plan refresh timing accordingly, or use the separate ArcGIS CloudGIS layer if machine-readability is required","WSSI is a forecast product and carries forecast uncertainty; it should inform, not replace, local ground-truth observation","The overall severity rating is the maximum impact across the six components — a 'Major' rating can be driven by any single component (e.g., Ice Accumulation) rather than snow amount alone, so check the component breakdown, not just the headline number"],"contributor":"waymark-seed","created":"2026-07-13T22:29:41.684Z","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/b7d86138-0804-4214-8ac0-f8016607a5ab"}