Convectively Coupled Equatorial Waves

Tropical-Extratropical Interactions

TRMM 3B42 rain-rates (shaded),
MJO-filtered 200 hPa Velocity Potential anomalies (colored-contours; cold-colored if negative; 0.5 STD intervals),
200 hPa Winds (magnitude only; black contours; starts at 40 m/s at 10 m/s intervals),
200 hPa irrotational winds (vectors; winds greater than 4 m/s only plotted)

Tropical-Extratropical Regional Plots

o   Maps of TRMM 3B42 rain-rates; MJO filtered VP200 anomalies; and 200 hPa Winds
o   TMPA rainfall rates and 1° GFS analyses are used for the last 7 days
o   Analyses are updated at 0000, 0600, 1200, and 1800 UTC with a 12-hour lag
o   Negative (cold-colored contours) MJO Filtered 200 hPa VP anomalies represent upper-level divergence
o   Positive (warm-colored contours) MJO Filtered 200 hPa VP anomalies represent upper-level convergence

Latest Analysis                    Last 7 Days
Pacific                               Pacific
Atlantic                                    Atlantic
Global                                 Global

Kelvin Wave Phase Space Diagram

To construct this diagram, the GFS variables used are anomalies of (Left) Kelvin filtered 200 hPa velocity potential; To see the variance of EOFs 1 and 2, click here.

Regional TRMM 3B42 rain rates, KW filtered 200 hPa VP anomalies, and 200 hPa GFS Wind anomalies

o   Maps of 200-hPa winds and rainfall rates
o   TMPA rainfall rates and 1° GFS analyses are used for the last 7 days
o   Analyses are updated at 0000, 0600, 1200, and 1800 UTC with a 12-hour lag
o   Negative (cold-colored contours) Kelvin Filtered 200 hPa VP anomalies represent upper-level divergence
o   Positive (warm-colored contours) Kelvin Filtered 200 hPa VP anomalies represent upper-level convergence

Latest Analysis                    Last 7 Days
Pacific                                Pacific
Atlantic                                 Atlantic
Africa                          Africa
Indian                                  Indian
Global                                  Global

Current State (200 hPa Velocity Potential)

Regional Filtered VP200 anomaly Maps

Latest Analysis                  Last 7 Days
Western Hemisphere             Western Hemisphere
Eastern Hemisphere                 Eastern Hemisphere
Global                            Global

Kelvin Filtered Velocity Potential Time-Longitude Plots (90 Days)

o   Global time–longitude GFS VP plots
o Unfiltered VP is shaded
o   Negative VP = Divergence
o   Kelvin Filtered Velocity Potential Anomalies are contoured and are standardized
     CINT: 1 STD
o   The convectively active phases of all Kelvin waves are represented by the "blue dashed" lines
o   Kelvin Filtering: Wave numbers 1-14; period of 2.5-30 days; equivalent depth of 8-90m.

                    VP200                                                                         VP850
20°N – 30°N          total    anom                  20°N – 30°N          total    anom
10°N – 20°N       total    anom                    10°N – 20°N       total    anom
Eq – 10°N              total    anom                                           Eq – 10°N              total    anom
5°S – 5°N           total    anom                                          5°S – 5°N                 total    anom
10°S – Eq            total    anom                                           10°S – Eq            total    anom
20°S – 10°S       total    anom                                           20°S – 10°S       total    anom
30°S – 20°S          total    anom                                           30°S – 20°S          total    anom

Kelvin and MJO Filtered Velocity Potential Time-Longitude Plots (260 Days)

Global time–longitude GFS VP200 plots
o Unfiltered VP is shaded
o   Negative VP = Divergence
o   Filtered VP anomalies are normalized
o   Kelvin Filtering: Wave numbers 1->14; period of 2.5-30 days; equivalent depth of 8-90m.
     CINT: 2 STD
o   MJO Filtering: Wave numbers 1->5; period of 30-96 days
     CINT: 0.5 STD
o   Contour Colors: Kelvin Waves = BLACK; MJO = RED

                VP200                                                             VP850
20°N – 30°N          total    anom                                                20°N – 30°N          total    anom
10°N – 20°N       total    anom                                                10°N – 20°N       total    anom
Eq – 10°N              total    anom                                               Eq – 10°N              total    anom
5°S – 5°N           total    anom                                            5°S – 5°N           total    anom
10°S – Eq            total    anom                                                10°S – Eq         total    anom
20°S – 10°S       total    anom                                                20°S – 10°S       total    anom
30°S – 20°S          total    anom                                              30°S – 20°S          total    anom

Kelvin Filtered TRMM 3B42 Rain Rate Time-Longitude Plots (30 Days)

o   Unfiltered TRMM 3B42 rain rates (and anomalies) are shaded
o   Negative Kelvin filtered TRMM rain rate anomalies are dashed (Suppressed phase)
o   Kelvin Filtering: Wave numbers 1-10; period of 2-20 days; equivalent depth of 8-mis.

                                         Pacific                             Atlantic                                   Africa
10°N – 15°N            total    anom                  total    anom                       total    anom
7.5°N – 12°N               total    anom              total    anom                       total    anom
5°N – 10°N              total    anom                total    anom                       total    anom
5°S – 5°N              total    anom                    total    anom                       total    anom
10°S – 5°S              total    anom                total    anom                       total    anom
12°S – 7.5°S       total    anom              total    anom                     total    anom
15°S – 10°S            total    anom                  total    anom                       total    anom