http://www.bom.gov.au/climate/enso/

The 2011–12 La Niña event has ended, with key indicators returning
to neutral (neither El Niño nor La Niña) levels. Climate models surveyed by the
Bureau of Meteorology suggest that neutral conditions will persist until at
least early winter.

http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.html

La Niña is expected to transition to ENSO-neutral conditions
during April 2012. La Niña continued to weaken during March 2012, as
below-average SSTs persisted primarily in the central Pacific.

Because atmospheric impacts often lag the demise of an ENSO episode, aspects of
La Niña are reflected in the coming season. Over the U.S. during April - June
2012, La Niña has the following weak influences on the climate outlook: There is
an increased chance of above-average temperatures in the south-central U.S., and
below-average temperatures in the Northwest. Also, drier-than-average conditions
are more likely across Utah and Colorado, and along the western Gulf of Mexico
(see 3-month seasonal outlook released on 15 March 2012).