Sunday, February 01, 2015

San Francisco gets no rain in January for first time in 165 years


In another sign California's persistent drought, downtown San Francisco recorded no measurable rain in January for the first time in 165 years.

The National Weather Service also said Santa Cruz recorded no rain in January for the first time since 1893. Normal rainfall for that city in January is more than 6 inches.

For the Bay Area as a whole, last month was the driest January on record, the weather service said .... http://www.latimes.com


How will global warming 
affect rainfall? - More rain


A warmer atmosphere can hold more moisture, and globally water vapour increases by 7% for every degree centigrade of warming. 

How this will translate into changes in global precipitation is less clear cut but the total volume of precipitation is likely to increase by 1-2% per degree of warming.

There's evidence to show that regions that are already wet are likely to get wetter, but details on how much wetter and what impacts there will be on a local scale are more difficult to ascertain .... http://www.theguardian.com