october 2014 weather in review friday weather discussion 31 october 2014
TRANSCRIPT
October 2014 Weather in Review
Friday Weather Discussion31 October 2014
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
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
Up North
Left: Arctic sea ice extent, 1 July to 29 OctoberRight: Northern Hemisphere snow and ice cover as of 29 October
Sources: Natl. Snow and Ice Data Center (left), National Ice Center (right)
Regional View
Left: Average 2-m temperature (°F), 1-29 OctoberRight: Departure of avg. 2-m temperature from 1981-2010 mean
Data obtained from Midwestern Regional Climate Center.
Regional View
Left: Accumulated precipitation (in), 1-29 OctoberRight: Percent of 1981-2010 mean for 1-29 October accum. precip.
Data obtained from Midwestern Regional Climate Center.
Local View
Data obtained from the National Weather Service.
High
Low
Departurefromnormal
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
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
Midwestern US: 1-2 October
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
Midwestern US: 9-10 October
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
Midwestern US: 13 October
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
Hurricane Gonzalo
Image obtained from http://weather.unisys.com/hurricane/atlantic/2014/.
Hurricane Gonzalo
Image obtained from NOAA/Environmental Visualization Laboratory.
Hurricane Gonzalo
Loop credit: Brian McNoldy/RSMAS-UMiami. Radar credit: Bermuda Weather Service.
Hurricane Gonzalo
Image credit: University of Wyoming.
Hurricane Gonzalo
Hurricane Gonzalo
Image credit: NASA/TRMM (http://trmm.gsfc.nasa.gov/publications_dir/regional_africa.html)