Rainless streaks weeks or months in the making may fall this week as a big shift in the weather pattern unfolds in California and the Southwest.
Slow-moving low pressure, still well off shore as of Sunday, could serve up some weather surprises as it begins sparking widely separated showers and thunderstorms as early as Tuesday.
To be clear, odds for any widespread soaking rain are very low, as this weather system will begin with limited stores of moisture.
The offshore low will take a track to the east and southeast, ending up near the Southern California coast by Thursday.
Monday, little in the way of rain will fall, as the low will still be over open water off northern California.
Tuesday, as the weather system drifts nearer to the coast, scattered showers will begin to be sparked in the west, and a few thunderstorms along and near the Sierra Nevada.
Wednesday and Thursday, the low will gain access to moisture from northwestern Mexico. Showers and thunderstorms are likely to increase at this time over the southern half of the state, throughout the Sierra Nevada and into Nevada.
Furthermore, scattered thunderstorms may break out eastward to Utah and northern Arizona on Thursday.
Notwithstanding limitations to rain-generating moisture, this low pressure area will have enough vigor to gin up a few strong thunderstorms with localized downpours, powerful wind gusts, even hail, Wednesday and Thursday.
For most Californians, it would be the first rain to speak of since late spring or early summer.
No measurable rain has fallen in downtown Los Angeles since July 12, for instance. San Franciscans have to look back to June 4 to find the last measurable rain. In Fresno, one most go all the way back to April, as the 26th was the date of the last rain of significance here.
Dry, even rainless, summers the rule in most of California, which has a "Mediterranean" climate.
Although the far north can turn rainy in October, most of California normally has to wait until November for the season's first widespread rainstorms.
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A potent storm will deliver a dose of cold rain and accumulating heavy, wet snow to parts of the northeastern United States into Friday.
As many as three storms will roll in from the Pacific Ocean and bring rounds of soaking rain and high-country snow to California from late this week to early next week.
While the big rain held off for baseball in Cleveland, weather may play a role with fly balls in Chicago for Games 3 and 4 of the World Series.
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12-18" of snow fell across the southwestern counties of the state.
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Heavy snow brought power lines down, leaving 44,000 people without power.