More than half a degree C lower than the long term averages again during April.
This also represents more than 4C below the average minimum for April in 2010. April in 2011 was even cooler than this year, so there seems to be an obvious cooling trend here.
The seasonal change from ‘wet to dry’ that usually occurs in April, began a couple of weeks earlier, reflecting a rapid cooling of Sea Surface temperatures after the passing of Cyclone Lua. This also shows that the La Nina has declined to normal territory for now.
GLOBAL The weekly global sea surface temperature anomalies are wiggling their way upwards in response to ebbing of the La Niña, and they are now at about 0.12 deg C.…
NINO3.4 Sea Surface Temperature (SST) anomalies (a commonly used El Niño-Southern Oscillation Index) are above the threshold for a La Niña. For the week centered on April 18, 2012, NINO3.4 SST anomalies are approximately -0.39 deg C.
NINO3.4 SST Anomalies – Short-Term
This weekly Reynolds OI.v2 SST dataset begins in 1990. I’ve started the graphs in 2004 to make the weekly variations visible.
Bob Tisdale’s new book:
MY FIRST BOOK
I referred to my recently published book a few times in this post. It is available in pdf and Kindle formats. See If the IPCC was Selling Manmade Global Warming as a Product, Would the FTC Stop their deceptive Ads? A copy of the introduction, table of contents, and closing can be found here. Of course, donations are welcome and gratefully accepted, because the rumor that bloggers skeptical of anthropogenic climate change are supported by big oil is simply that, a rumor.