Phoenix average high is 94 for today, the forecast high today, 78 & the 10 day, calls for temps to remain below normal.

The reason for this could be the la nina in the tropical pacific, jet stream temps r lower than normal:

[link to www.elnino.noaa.gov]

Stormchasers on the discovery channel Sunday night will go into it - claim the big twister, maybe the largest in history r a side effect of the La nina. The video's r intense:

[link to dsc.discovery.com]