National Weather Service United States Department of Commerce

Boston / Norton, MA

Weather Forecast Office

Watch / Warning / Advisory Criteria

Weather.gov > Boston / Norton, MA > Watch / Warning / Advisory Criteria


The following are National Weather Service criteria for issuing Watches / Warnings / Advisories:

  • Watches: 50% confidence of meeting Warning criteria (generally within 36-48+ hours).
  • Advisories and Warnings: 80% confidence in the event occurrence (generally within 24-36 hours).
  • If you are looking for actual products, please consult our product webpage.
  • If you are looking for product descriptions, please consult our product description webpage.
  • For the full listing of criteria, please consult this summaryresource.
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