Michael J. Ventrice, Ph.D.
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Global Time–Longitude Plots ​

o   Time–longitude plots of rainfall and winds, averaged over the indicated 10° latitude bands.
o   Wind plots use 1° GFS analyses for the last 90 days
o   Updated daily at 1200 UTC 


                                  850 hPa Meridional Wind              
20°N – 30°N                    total    anom             
10°N – 20°N                    total    anom              
Eq – 10°N                       total    anom              
5°S – 5°N                        total    anom              
10°S – Eq                       total    anom            
20°S – 10°S                    total    anom              
30°S – 20°S                    total    anom     


850 hPa Global Zonal Wind Time–Longitude Plots
o   Time–longitude plots of 850 hPa U for each region, averaged over the indicated latitude bands
o   GFS forecast attached to 30 Day plots


                                                    30 Day                                      90 Day              
20°N – 30°N                          total    anom                                        
total    anom                             
10°N – 20°N                           total    anom                                        
total    anom                                                
Eq – 10°N                               total    anom                                        
total    anom                                        
5°S – 5°N                                total    anom                                       
total    anom                                              
10°S – Eq                               total    anom                                        
total    anom                                            
20°S – 10°S                           total    anom                                        
total    anom                                         
30°S – 20°S                           total    anom                                        
total    anom    


200 hPa Global Zonal Wind Time–Longitude Plots
o   Time–longitude plots of 200 hPa U for each region, averaged over the indicated latitude bands
o   GFS forecast attached to 30 Day plots

                                          30 Day                                     90 Day              
20°N – 30°N                    total    anom                              total    anom                                  
10°N – 20°N                    total    anom                              total    anom                                                
Eq – 10°N                       total    anom                              total    anom                                                
5°S – 5°N                       total    anom                              total    anom                                                
10°S – Eq                       total    anom                              total    anom                                              
20°S – 10°S                    total    anom                              total    anom                                             
30°S – 20°S                    total    anom                              total    anom          
          

200 hPa Global Velocity Potential Time–Longitude Plots

o   Time–longitude plots of velocity potential for each region, averaged over the indicated latitude bands 

o   GFS forecast attached to 30 Day plots
                                          30 Day                                        90 Day              
20°N – 30°N                  
  total    anom                                   total    anom                                                          
10°N – 20°N                   
total    anom                                   total    anom                                                                        
Eq – 10°N                      
total    anom                                          total    anom                                                                          
5°S – 5°N                       
total    anom                                  total    anom                                                                      
10°S – Eq                      
total    anom                                   total    anom                                                                          
20°S – 10°S                   
total    anom                                   total    anom                                                                  
30°S – 20°S                   
total    anom                                  total    anom        


850 hPa Global Velocity Potential Time–Longitude Plots
o   Time–longitude plots of velocity potential for each region, averaged over the indicated latitude bands 
o   GFS forecast attached to 30 Day plots
                                          30 Day                                            90 Day              
20°N – 30°N                  
  total    anom                                   total    anom                                                          
10°N – 20°N                   
total    anom                                   total    anom                                                                        
Eq – 10°N                      
total    anom                                   total    anom                                                                          
5°S – 5°N                       
total    anom                                   total    anom                                                                      
10°S – Eq                      
total    anom                                    total    anom                                                                          
20°S – 10°S                   
total    anom                                    total    anom                                                                  
30°S – 20°S                   
total    anom                                    total    anom        

                                                  
                                                                                                                        
200 hPa Meridional Wind:  Extra-tropical wave trains
o   Time–longitude plots of meridional wind for both hemispheres, averaged over the indicated latitude bands 
o  GFS forecast attached to 30 Day plots

                                                      30 Day                                          90 Day              
30°N – 60°N                            
  total    anom                                               total    anom                                                          
30°S – 60°S                             
total    anom                                               total    anom                                                                                                                                                                                                                                                                                                                      

o   The precipitation data comes from the real-time version of NASA’s TRMM multisatellite precipitation analysis (TMPA, TRMM product 3B42RT).
o   Forecast data and 850-hPa wind analyses come from NCEP’s GFS model.  
o   Anomalies are calculated by subtracting the first four harmonics of the annual cycle.  The annual cycle for precipitation is calculated from the research on of the NASA TRMM 3B42 (1998–2008), and the cycle for 850-hPa winds are calculated from ERA-interim reanalyses (1989–2008).
o   All plots are made using NCAR Command Language (NCL).
o   This website is supported by funding from the NASA Grant NNX09AD08G.          
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