1. Winter Weather Jim Stefkovich National Weather Service Office Calera, Alabama Jim.stefkovich@noaa.gov

3. NOAA

4. Definitions Winter Storm Watch - 50% confidence of meeting warning criteria in next 12-48 hours Winter Storm Warning - > 2” snow, > 1” sleet, 1/4” ice Winter Weather Advisory – less than warning criteria

5. Winter Storm Outlook: Alerts the public to the chance for winter storm conditions 3 to 7 days in advance.Winter Storm Outlook: Alerts the public to the chance for winter storm conditions 3 to 7 days in advance. Winter Storm Watch: 50% confidence of meeting warning criteria within the next 12 to 48 hours.Winter Storm Watch: 50% confidence of meeting warning criteria within the next 12 to 48 hours. Winter Storm Warning: Issued for significant accumulations of snow, freezing rain, or sleet, usually issued 12 to 36 hours before the event begins.Winter Storm Warning: Issued for significant accumulations of snow, freezing rain, or sleet, usually issued 12 to 36 hours before the event begins. Winter Weather Advisory: Issued for accumulations of snow, freezing rain/drizzle, or sleet below warning criteria but are expected to cause hazardous driving conditions.Winter Weather Advisory: Issued for accumulations of snow, freezing rain/drizzle, or sleet below warning criteria but are expected to cause hazardous driving conditions. Winter Weather Definitions

6. HuntsvilleBirmingha m MobileTallahasse e Advisory Warning 1-2” ¼ to 2”Up to 2”Up to 1” > 2”> 2” ≥ 2” ≥ 1” HuntsvilleBirmingha m MobileTallahasse e Advisory Warning < 1/4” < < < ≥ 1/4”≥ 1/4” ≥ 1/4” ≥ 1/4”

7. Is it about the “Warning” or Impacts?

10. HuntsvilleBirminghamMobileTallahassee Advisory Warning National Weather Service Birmingham www.srh.noaa.gov/bmx 1-2” ¼ to 2”Up to 2”Up to 1” Patrice Kurzejeski, St. Clair County EMA

11. National Weather Service Birmingham www.srh.noaa.gov/bmx Madison County, January 9 th, 2011 HuntsvilleBirminghamMobileTallahassee Advisory Warning 1-2” ¼ to 2”Up to 2”Up to 1” > 2”> 2” ≥ 2” ≥ 1” Winds ≥ 35 MPH and visibilities < 1/4 mile

12. National Weather Service Birmingham www.srh.noaa.gov/bmx Randolph County, January 9 th, 2011 HuntsvilleBirminghamMobileTallahassee Advisory Warning < 1/4” < < < ≥ 1/4”≥ 1/4” ≥ 1/4” ≥ 1/4”

13. National Weather Service Birmingham www.srh.noaa.gov/bmx HuntsvilleBirminghamMobileTallahassee Freeze* Hard Freeze 3 hrs < 32⁰ < < 2 hrs < 32⁰ N/A≤ 15⁰ ≤ 20⁰ 2 hrs < 26⁰ Limited to “growing season”

14. National Weather Service Birmingham www.srh.noaa.gov/bmx HuntsvilleBirminghamMobileTallahassee Advisory Warning < 1/4” < < < ≥ 1/4”≥ 1/4” ≥ 1/4” ≥ 1/4”

15. National Weather Service Birmingham www.srh.noaa.gov/bmx HuntsvilleBirminghamMobileTallahassee Advisory Warning 0 to -9⁰ 0 to -9⁰10 to -9⁰20 to 1⁰ ≤ -10⁰≤ -10⁰ ≤ -10⁰ ≤ 0⁰

16. National Weather Service Birmingham www.srh.noaa.gov/bmx