1. October 2014 Weather in Review Friday Weather Discussion 31 October 2014

2. Global View Left: 1-27 October mean 500 hPa geopotential height (m) Right: Departure of 1-27 October mean from 1980-2010 climatology Data obtained from NOAA/ESRL/PSD, derived from NCEP-NCAR Reanalysis

3. Global View Left: 1-27 October mean 850 hPa temperature (K) Right: Departure of 1-27 October mean from 1980-2010 climatology Data obtained from NOAA/ESRL/PSD, derived from NCEP-NCAR Reanalysis

4. Up North Left: Arctic sea ice extent, 1 July to 29 October Right: Northern Hemisphere snow and ice cover as of 29 October Sources: Natl. Snow and Ice Data Center (left), National Ice Center (right)

5. Regional View Left: Average 2-m temperature (°F), 1-29 October Right: Departure of avg. 2-m temperature from 1981-2010 mean Data obtained from Midwestern Regional Climate Center.

6. Regional View Left: Accumulated precipitation (in), 1-29 October Right: Percent of 1981-2010 mean for 1-29 October accum. precip. Data obtained from Midwestern Regional Climate Center.

7. Local View Data obtained from the National Weather Service. High Low Departure from normal

8. Outline Midwestern US precipitation episodes – October 1-2, 9-10, 13 Amplified pattern across Eurasia Notable tropical cyclone events and their possible influences upon the mid-latitudes

9. Midwestern US: 1-2 October http://tinyurl.com/octradar1

10. Midwestern US: 1-2 October Top: 500 hPa height (every 6 dam), temperature (every 2°C), and observations Bottom: 850 hPa height (every 3 dam), temperature (every 2°C), dew point temperature (every 1°C), and observations Valid: 0000 UTC 2 October 2014 Source: Storm Prediction Center

11. Midwestern US: 1-2 October

12. Midwestern US: 9-10 October http://tinyurl.com/octradar2

13. Midwestern US: 9-10 October Top: 500 hPa height (every 6 dam), temperature (every 2°C), and observations Bottom: 850 hPa height (every 3 dam), temperature (every 2°C), dew point temperature (every 1°C), and observations Valid: 0000 UTC 10 October 2014 Source: Storm Prediction Center

14. Midwestern US: 9-10 October

15. Midwestern US: 13 October http://tinyurl.com/octradar3

16. Midwestern US: 13 October Top: 500 hPa height (every 6 dam), temperature (every 2°C), and observations Bottom: 850 hPa height (every 3 dam), temperature (every 2°C), dew point temperature (every 1°C), and observations Valid: 0000 UTC 14 October 2014 Source: Storm Prediction Center

17. Midwestern US: 13 October

18. Eurasia: 1-31 October http://www.atmos.albany.edu/student/heathera/dt/nhem/1_to_15_oct14.html http://www.atmos.albany.edu/student/heathera/dt/nhem/15_to_31_oct14.html Early: higher latitude blocking, vortex merger and subsequent southward displacement Middle: ejection, but with reinforcement of longwave trough-dominated pattern Late: more progressive pattern taking hold

19. Hurricane Gonzalo Image obtained from http://weather.unisys.com/hurricane/atlantic/2014/.http://weather.unisys.com/hurricane/atlantic/2014/

20. Hurricane Gonzalo Image obtained from NOAA/Environmental Visualization Laboratory.

21. Hurricane Gonzalo Loop credit: Brian McNoldy/RSMAS-UMiami. Radar credit: Bermuda Weather Service.

22. Hurricane Gonzalo Image credit: University of Wyoming.

23. Hurricane Gonzalo

24. Image credit: NASA/TRMM (http://trmm.gsfc.nasa.gov/publications_dir/regional_africa.html)