SATL: Brazilian disturbance (now just north of equator)

[RL3AO]

Pretty messy on ASCAT, but it looks okay on satellite. A nice little treat during SH winter.





GOES 16 loop

http://rammb-slider.cira.colostate.edu/?sat=goes-16&sec=full_disk&x=21114&y=12588&z=3&im=24&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&p%5B0%5D=16&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20170706131538&slider=-1&hide_controls=0&mouse_draw=0&s=rammb-slider

[terstorm1012]

this is neat. thanks!
bit out of season though, yes?

[1900hurricane]

Pretty low latitude. It actually reminds me of, along with 04L, twin tropical disturbances/cyclones that will occasionally develop in the Pacific with strong westerly wind bursts.

[Kingarabian]

Pretty low latitude. It actually reminds me of, along with 04L, twin tropical disturbances/cyclones that will occasionally develop in the Pacific with strong westerly wind bursts.

2nd instance this year.

Calvin and Cindy in June as well due to a WWB.

[RL3AO]

Pretty low latitude. It actually reminds me of, along with 04L, twin tropical disturbances/cyclones that will occasionally develop in the Pacific with strong westerly wind bursts.

2nd instance this year.

Calvin and Cindy in June as well due to a WWB.

I think he was referring to systems on opposite sides of the equator. Happens with Equatorial Rossby waves in WPAC And Indian Ocean.

[Kingarabian]

Pretty low latitude. It actually reminds me of, along with 04L, twin tropical disturbances/cyclones that will occasionally develop in the Pacific with strong westerly wind bursts.

2nd instance this year.

Calvin and Cindy in June as well due to a WWB.

I think he was referring to systems on opposite sides of the equator. Happens with Equatorial Rossby waves in WPAC And Indian Ocean.

Oh that's interesting.

Then maybe TD04 and future Don will count since the WWB is still active.

[1900hurricane]

Pretty low latitude. It actually reminds me of, along with 04L, twin tropical disturbances/cyclones that will occasionally develop in the Pacific with strong westerly wind bursts.

2nd instance this year.

Calvin and Cindy in June as well due to a WWB.

I think he was referring to systems on opposite sides of the equator. Happens with Equatorial Rossby waves in WPAC And Indian Ocean.

Yep, that is what I was referring to. I've seen Madden-Julian spawn hemispheric twins as well (such as with Pam and Bavi in March 2015), but I'm not quite sure if there is anything significant at play here, especially since the equatorial westerlies didn't really seem to extend into the Southern Hemisphere. It may just be coincidence (as you speculate in your own tweet), but the proximity of the two does make you wonder.

 https://twitter.com/codyyeary/status/883104936304795649

[AJC3]

The weak remnant CW-rotating cyclonic low level vortex continues to move quickly northward, and as of 12Z, has actually crossed the equator. It's now what I like to call a "wrong-way" vortex centered at around 0.7N, 34W and headed toward the ITCZ and its demise.

Time-sensitive animation here... http://rammb.cira.colostate.edu/ramsdis ... height=480

Static Image with and without annotations...

[chaser1]

Nice loop. It's an interesting perturbation in and of itself. I'm curious if in the much broader picture, if this might be some indication of some greater than typical equatorial convergent flow enhancing tropical waves over the MDR this season?