1. Why Was the Winter of 2013-14 so Cold and Snowy Kevin Birk and Ricky Castro NWS Chicago- Romeoville, IL

2. What is an “Average” Winter (1981-2010)

3. What Were the Stats This Winter (2013-14)

4. What Caused This?

5. The Jet Stream

7. The Jet Stream Pattern this Past Winter

8. The Jet Stream Pattern Winter 2011-12

9. What Impacts the Behavior of the Jet Stream?

10. Upper Level Pattern Near Alaska Also known as East Pacific Oscillation (EPO) Temperature anomalies Pressure anomalies Temperature anomalies Pressure anomalies Jet Stream

11. Eastern Pacific Oscillation (EPO)

12. North Atlantic and Arctic Oscillation (NAO/AO)

13. -NAO signal Jet Stream trough Develops over east CONUS

14. Conclusion

15. THANKS FOR READING! If you have any questions, email us: nws.chicago@noaa.gov