South­ern California’s sum­mer rains ex­plained

The North Amer­i­can mon­soon brings sticky, trop­i­cal weather to Los Angeles and show­ers and thun­der­storms mostly to South­ern California’s moun­tains and deserts. Here’s how it works:

Los Angeles Times - - CALIFORNIA -

1. Late spring and early sum­mer

The sub­trop­i­cal ridge of high pres­sure is typ­i­cally over Mex­ico.

2. July through Septem­ber

High pres­sure shifts to the north and expands, bring­ing heat to the desert South­west and South­ern California.

3. Mon­soonal mois­ture

Clockwise cir­cu­la­tion around the high pres­sure pulls sub­trop­i­cal mois­ture up from the south.

4. Sum­mer show­ers and thun­der­storms

Mon­soonal show­ers and thun­der­storms some­times spill over from the moun­tains and deserts into the L.A. Basin.

Paul Du­g­in­ski Los Angeles Times

Sources: Bill Patzert, NASA Jet Propul­sion Lab­o­ra­tory; Na­tional Weather Ser­vice Los Angeles/Ox­nard; Ac­cuWeather; Times re­port­ing

Newspapers in English

Newspapers from USA

© PressReader. All rights reserved.