Going to show the maps for the Oct 2nd and Oct 9th this week as the NCDC was kinda slow in releasing the information.
As I have mentioned before, summertime is not a period for large temperature anomaly and that the other times of year had much stronger signals. Sep 25th showed some of that, but two weeks ago was the first real big anomaly week in some time.
The week that ended on Oct 2nd was well above normal in most of the country, but even in a week like that there was plenty of normal temperatures and places below average. To change pace the Southeastern US had some below average temperatures in a year that has had that area mostly above average. The reverse of the that in the Northwestern US where the cooler than average year was replaced by much warmer than average temperatures. I can attest to that as I was watching my sons football games in the afternoon in what was almost summer like temperatures. I prefer the cooler temperature myself.
Here are what the earlier years have looked like.
2009: Both weeks MUCH colder than usual at this time of year. This is how weather differs from climate.
So the two year trend for these weeks is an enormous trend up in temperature, but it is also totally meaningless.
2008: These are two great weeks to look at back to back. The anomaly basically flips on sides of the country. Not abnormal, but this is a pretty good example of that.
2007: Is a year that may have similarities to this fall as there was a La Nina as well that fall, but nothing compared to the one developing now. This winter and next spring will be very interesting to watch. The last La Nina was like this in the US. The west was cooler than normal 3 years ago and this winter is likely to be similar, but possibly much more so than 3 years ago. It could be a snowy and cold winter in the west. Good year to plan for lots of skiing.
I am working on the best way to present seasonal presentations of these maps. I hope that will be informative to most people.