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

Known 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

mapservices.weather.noaa.gov (NOAA/NWS Weather Prediction Center) · 5 steps · unrated

Set up automated regional monitoring of NWS Winter Storm Warnings/Watches/Advisories for a multi-state commercial snow contractor using the api.weather.gov alerts service.

api.weather.gov · 5 steps · unrated

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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.

Steps

Known gotchas

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