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Winter Weather Products and Criteria

Winter Weather Products and Criteria. Steve Naglic WCM NWS Columbia, SC. Winter Storm Outlook Hazardous Weather Outlook Issued daily around 5am 1-7 day time period 30% or greater probability of meeting local warning criteria Update if threat changes. Special Weather Statement

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Winter Weather Products and Criteria

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  1. Winter Weather Productsand Criteria Steve Naglic WCM NWS Columbia, SC

  2. Winter Storm Outlook Hazardous Weather Outlook Issued daily around 5am 1-7 day time period 30% or greater probability of meeting local warning criteria Update if threat changes. Special Weather Statement Used by some offices in lieu of HWO

  3. Near to Long TermArea Forecast Discussion

  4. Winter Weather Watch (WSW) Winter Storm, Blizzard, Wind Chill Watch 12-48 hour time period (2nd, 3rd, or occasionally 4th periods) 50% or greater probability of meeting local warning criteria

  5. Winter Weather Warning (WSW) Winter Storm, Heavy Snow, Ice Storm, Sleet, Blizzard, Wind Chill Warning 12-36 hour time period (1st, 2nd, or occasionally 3rd periods) 80% or greater probability of meeting local warning criteria

  6. Watch and Warning Criteria Winter Storm -3 (~2) inches snow in 12 hrs, or 2 to 4 (~ 3) inches of snow/sleet in 24 hrs ¼ inch or more of freezing rain in 12-24 hrs. Blizzard heavy snow/vsyb <= ¼ mile and wind >= 35 mph for 3 hrs within first 12 hrs. Wind Chill…-15 degrees F or colder

  7. Winter Weather Advisory (WSW) Snow, Blowing Snow, Freezing Rain, Sleet and Wind Chill Conditions 12-36 hour time period (1st, 2nd, or occasionally 3rd periods) 80% or greater probability of meeting local warning criteria For freezing rain event, POP for FZRA should be 60% or higher

  8. Advisory Criteria Snow/Sleet Advisory…1 in. or less Freezing Rain Advisory…< ¼ in. Wind Chill Advisory…0 to -14 degrees F Blowing Snow Advisory…heavy snow/vsby <= ¼ mile and wind and wind < 35 mph for 3 hrs within first 12 hrs.

  9. OutlookLead Times Strive for 48 to 60 hours Long holiday weekends may require longer lead times

  10. WatchLead Times Strive for 24 to 36 hours Long holiday weekends may require longer lead times

  11. Warning and Advisorie Lead Times Strive for 12 to 24 hours Longer in exceptionally high confidence situations Long holiday weekends may require longer lead times

  12. Lead Time Summary Outlooks: 48 - 60 hrs Watches: 24 – 36 hrs Warnings: 12 - 24 hrs

  13. Criteria Summary

  14. On the Web

  15. On the Web

  16. On the Web

  17. Questions? Email: Steven.Naglic@NOAA.GOV 803-765-5501

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