About Hourly Impact Scores:

Forecast hourly impact scores are computed based on the forecasted weather severity for each hour for each center/airport, which are then compared to the five-year historical distribution (2020-2024) of hourly impacts and assigned the score corresponding to the percentile thresholds shown to the right. Forecast hourly impact scores are generated for the next day using the 12Z forecast data. Day of Operations updates to these forecast impact scores are currently being developed.

  • 10: Above 98th Percentile
  • 9: Between 95th and 98th Percentile
  • 8: Between 90th and 95th Percentile
  • 7: Between 80th and 90th Percentile
  • 6: Between 70th and 80th Percentile
  • 5: Between 60th and 70th Percentile
  • 4: Between 45th and 60th
  • 3: Between 30th and 45th Percentile
  • 2: Between 15th and 30th Percentile
  • 1: Less than 15th Percentile (but greater than 0)
  • 0: No impact

Forecasted Hourly Scores

Please enter dates in U.S. format (Month/Day/Year). No data prior to Jan. 1, 2017.

Submitting a new date will replace the current hourly scores table.

"-" Indicates Missing Data