About Impact Scores:

Daily weather impact scores are computed based on the 12-hr period of the day with the greatest observed aviation impacting weather severity, which is then compared to the five-year (2020-2024) historical baseline of daily impacts and assigned the score corresponding to the percentile ranges on the right. Forecast impact scores are generated for the next day using 12Z forecast data, and updated hourly during the Day of Operations starting with 8Z.

  • 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 Impact 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 daily scores table.

"-" Indicates Missing Data