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El Niño: When Will It Start Raining In California?


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One of the strongest El Niño winters ever recorded since modern records first began in 1950 continues to grow in the Pacific Ocean, federal scientists reported Thursday.

 

 
 

So, with the likelihood for a wet winter increasing across drought-parched California, residents staring at empty reservoirs and dead lawns are asking: "When will it start pouring?"

 

 
 

The answer, experts said Thursday, is that winter storms in strong El Niño years typically bring more rain to California than normal, but they don't do it any earlier.

 

An analysis of the five winters back to 1950 in which strong El Niño conditions similar to this year have occurred shows that in the Bay Area during those years, October has been only slightly wetter than the historic average. November has been nearly twice as wet in most. December has been oddly drier than normal in all five strong El Niño winters. And the bulk of the rain -- the real downpours with high risk of floods and mudslides -- have occurred in January and February.

 

 
 

"For the most part, our rainy season really gets going in November, and El Niño is an add-on to our regular rainy season," said Jan Null, a meteorologist formerly with the National Weather Service who runs Golden Gate Weather Services in Saratoga.

 

 
 

Using San Francisco rainfall as a baseline for the Bay Area, in four of the five strong El Niño years -- 1957-58, 1972-73, 1982-83 and 1997-98 -- the overall annual rainfall totals have exceeded the historical average of 23.9 inches. In the wettest, 1997-98, the rainfall was double the average, at 47.22, with relentless rainfall in January and February that soaked the state and caused flooding and mudslides. Other Bay Area cities showed similar patterns.

 

 
 

"If we don't see a lot of rain in December, we should realize that's not a big deal; it's happened before in strong El Niño years," said Null, who compiled the data. "January and February have been big months."

 

 
 

Only once, in 1965-66, when the annual rainfall totaled 15.84 inches, was there a drier-than-normal year in the Bay Area during a strong El Niño.

 

On average, 70 percent of the Bay Area's yearly rain total falls during just four months: November, December, January and February, a staple of Northern California's Mediterranean climate. Similarly, during the soaked winter of 1997-98, about 77 percent of the Bay Area's rain fell in those same four months.

 

On Thursday, scientists at NOAA issued their monthly El Niño update. It reported very warm Pacific Ocean temperatures at the equator in a key area that indicates El Niño strength. The water there, off Peru, averaged 4.1 degrees Fahrenheit warmer than the historic average in September, up from 3.72 degrees above average in August and slightly above September 1997, when it was 4 degrees warmer.

 

"This El Niño continues to be a strong event, and we have every expectation that it will remain this way through the winter," said Mike Halpert, deputy director of the National Oceanic and Atmospheric Administration's Climate Prediction Center in College Park, Maryland. "The ocean has gotten a little warmer. It continues to strengthen."

 

NOAA scientists said there continues to be a 95 percent chance that El Niño conditions will continue through the end of this year -- up from 85 percent in June and 50 percent last spring.

Posted

December lo full rain, ippudu South carolina situation vastundi central cal/east bay levees daggara ani talk man. anyway, cali weather gurinchi discussions ante, www.weatherwest.com best resource. aa site discussions very good resources

Posted

December lo full rain, ippudu South carolina situation vastundi central cal/east bay levees daggara ani talk man. anyway, cali weather gurinchi discussions ante, www.weatherwest.com best resource. aa site discussions very good resources

 

we need rain man..

 

Sierra lo snow..ikkada kunda pota varsham kaval...

Posted

we need rain man..

 

Sierra lo snow..ikkada kunda pota varsham kaval...

 

kunda pota varsham padithe floods man, maa illu ki danger. jagratthaga ravali.

 

10 days back tahoe ki vellanu, 100 yards lopalaki undi water, naduchukuntu vellanu lopala daka. very bad.

  • 3 months later...
Posted

Calif. is back biatches. Lake Shasta above 50%, Oroville scheduled to be above 50% in the next couple of weeks

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