All these articles are coming out (probably based on the same data) which predicts an (up to) 30 foot rise in the ocean level over the next 100 years from polar ice and greenland ice melt. If they would only quote all the data, it would suggest that rain reversal like we saw last year will become more frequent (where the northeast gets nothing and the southwest gets soaked).
More "out there" studies:
If the north pole did completely melt it's core and lose it's ice cap, (even close to it) the ocean water currents would change dramatically and northern europe and central canqada would on average decrease -20F (-7F would be a mini ice age and devistate agriculture), because of the cold air currents pushing south, the norhteast storms would hit further south and a generally cooler northern wind would dominate the midwest. This is where the confusion of colder winters in the midwest actually contradict global warming. On the pacific side, Washington, BC, and Oregon would become more arid, and the southwest would get more rain on average (northern storms).
Although this would not spell a doomsday forcast in the U.S. it would severly criple eastern europe and canada with much cooler temperatures eventually leading to years where spring will not come, snowpacks will build, and over thousands of years snowpacks will be so deep new glaisiers will form and push both north and south starting the next true ice age and won't reverse again until the north pole is coverd once again by glaciers growing from eastern europe and Canada northward.
Global warming according to my research (which is admitedly sparce) is not caused by humans and is a natural cycle of warming and cooling over tens of thousands of years. Although we may help it can't be more than 1/4-1 degree F per 100 years maximum.
In other words, expect more rain on average in California.