Raymond and T.D. 21-E, The Latest Simultaneous Pair of Tropical Cyclones in the East Pacific

Jonathan Belles
Published: November 17, 2019

A late pair of simultaneous tropical cyclones have formed off the coast of Mexico as we enter the last two weeks of hurricane season.

While having one or even two tropical cyclones active in November isn't unheard of, it is rare to have two churning at the same this late in the year. In fact, it hasn't happened in the satellite era before this weekend.

Latest Information

Neither system is expected to be a big problem for Mexico, but Raymond is expected to spread moisture well inland.

Raymond will dissipate on Sunday as it nears Baja California, but its moisture will be strewn northward and into the southwestern United States.

This burst of moisture will function as an accelerant to a pattern change already taking shape along the West Coast.

This plume will help bring the first significant rain and snow of the rainy season for Southern California and some drought-denting rains to the rest of the Southwest.

Moisture and Satellite

Several tropical storms and hurricanes provide moisture for Mexico and the southwestern U.S., but that usually occurs during the monsoon. This burst of moisture will be later than usual coming from the tropics, but an uptick in rain chances across the Southwest this time of year is right on time as the rainy season begins.

The last tropical storm typically forms in the eastern Pacific around November 5, on average.

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