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Winter Weather Meeting

Winter Weather Meeting. Leonard Vaughan NWS Meteorologist. Winter Storm Outlook (HWO). Winter Storm Outlook (HWO) 1-7 day time period 30% or greater probability of meeting local warning criteria Update if threat changes. Winter Weather Watch (WSW). Winter Weather Watch (WSW)

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Winter Weather Meeting

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  1. Winter Weather Meeting Leonard Vaughan NWS Meteorologist

  2. Winter Storm Outlook (HWO) Winter Storm Outlook (HWO) 1-7 day time period 30% or greater probability of meeting local warning criteria Update if threat changes.

  3. Winter Weather Watch (WSW) 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

  4. Winter Weather Watch Criteria (Winter Storm)…2 to 4 (~ 3) inches of snow/sleet or ¼ in. of freezing rain – 24 hrs.  (Blizzard)…heavy snow/vsyb <= ¼ mile and wind >= 35 mph for 3 hrs, 12-36 hour period. (Wind Chill)…-15 degrees or colder

  5. Winter Weather Warning (WSW) 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. Winter Weather Warning Criteria (Winter Storm)…2 inches snow in 12 hrs 2 to 4 (~ 3) inches of snow/sleet in 24 hrs ¼ inch 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 or colder

  7. Winter Weather Advisory (WSW) Winter Weather Advisory (WSW) Winter Weather, Snow and Blowing Snow, Snow, Blowing Snow, Freezing Rain, Sleet, Wind Chill Advisory 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. Winter Weather 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. Criteria for Winter Weather Advisories Snow and/or Sleet: 1/2 inch regardless of time period Can be worded as “around an inch” Freezing Rain: Any accretion of freezing rain or freezing drizzle on roads and/or sidewalks

  10. Criteria for Winter Storm Warning Freezing Rain 1/4 inch regardless to time period

  11. Criteria for Winter Storm Warning Snow and/or Sleet 12-hr criteria: 2 inches Can word as “1 to 3 inches” or “around 2 inches” 24-hr criteria: 3 inches Can word as “2 to 4 inches” or “around 3 inches”

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

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

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

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

  16. Winter Outlook

  17. Winter Outlook – “El Nino”

  18. Effects…

  19. to this…

  20. Course will run through March 3rd. • Any questions you can e-mail Jim or Leonard at: • Jim.Kilmer@noaa.gov • Leonard.Vaughan@noaa.gov

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