Clean ASCAT pass from 0327z. Right where models progged development to begin (this is also a historically favored region for tropical cyclogenesis).

Fairly well defined surface circulation just offshore of Tampico, MX, but showers and thunderstorms remain sparse, fleeting, and insufficiently organized. There is a better chance later today, Tuesday, and tomorrow, Wednesday, of enough of a break in the moderately strong wind shear that has been plaguing this system for some development.

Regardless of development, potentially heavy rains will likely persist over eastern Mexico for much of this week.