My 3 cents:
1993, weather predictions are pretty much accurate, 1, 3, 7, 14 days, whatever, works.
2003, daily forecasts would help if people looked outside a window though generally accurate and long range forecasts are broken.
2013, same day forecasts are broken and long range, pfft.
A couple things I have observed, which seem fairly important.
#1) The Arctic Jet is missing. In years past, there was a physical circle of water vapor orbiting at 10 to 15 North Latitude and when a finger broke off, the area that finger went to would get REALLY cold.
http://squall.sfsu.edu/scripts/nhemjetstream_model.html If you look at the images right now (build animation for 20 days, every 6 hours), you would see really strange things. Like a finger of the Northern Jet going up and through the arctic circle. Which brings me to
#2) The Tropical Jet, maybe it is also called the Gulf stream, is merging every so often with the Northern Jet. You can see it on the animation site I linked but if you also view the water vapor page, (which my site has had for quite some time:
http://agrisea.net/weather/wv.html), you can see where all the stuff is going.
If you are in to agriculture, get your own monitoring equipment so you know what is happening for your locations. The rest of you, hold on, it is going to be bumpy.