• Kay will weaken as it tracks near Baja California into the weekend.
  • Its moisture will wring out heavy rain that could cause flooding in S. California Friday into the weekend.
  • Kay will also continue to bring heavy rain and strong winds to Baja California.

Hurricane Kay will send tropical moisture into Southern California and other parts of the Southwest beginning Friday, resulting in localized heavy rainfall that might trigger flooding in some areas.

Kay is forecast to track parallel to Baja California while weakening to a tropical storm because of cooler sea-surface temperatures and drier air. The storm’s low-pressure system will then curl westward well to the south of Southern California this weekend.

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Later Friday into this weekend is when Kay’s moisture could surge into Southern California as the system winds down well offshore.

F​lood watches have been issued by the National Weather Service from the mountains of Southern California into the adjacent deserts as far east as southwest Arizona. This is where rainfall from Kay is most likely to trigger flooding, including in recent burn areas.

At least some pockets of rain are expected in Southern California Friday night into Saturday, including the San Diego and Los Angeles areas. But it’s uncertain how much rain to expect in these areas at this time.

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T​otal rainfall in parts of the Southern California mountains could be 1 to 4 inches through Saturday.

Amounts in other areas coastal Southern California, southern Nevada and western Arizona will be lighter, overall. But rainfall could be excessive in localized pockets, triggering possible flooding.

I​n addition to the rainfall, gusty winds will also develop in Southern California, particularly in the mountains. Those winds could enhance wildfire danger prior to the onset of any rainfall. That includes the ongoing Fairview Fire near Hemet.

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M​exico’s Baja California Forecast

Baja California will see bands of heavy rain that could trigger more flash flooding and landslides over the next few days. Locally up to 15 inches of rain is possible in a few spots.

Tropical storm watches extend as far north as the U.S. – Mexico border, including Tijuana.

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The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.

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