From tonight's storm.

It think a geographic or thermal deal, but I don''t know.

Hmmmmm?!?!

Update:  I just emailed the NWS here in Tucson and Chuck George the question.  I will let you know what they say.

Update II - Chuck George responds:

Hi Scott!  The direction of movement has generally been very slowly to the west with recent storms.  Marana/NW Side are farther from the mountains.  If the atmosphere is not unstable enough, the storms will fall apart before they reach locations far from the Catalinas and Rincons (those two mountain ranges are high enough to help lift the air enough to enhance storm chances, even when the atmosphere is only moderately unstable or "ripe" for producing storms.)

Surely you got rain on Saturday, though, right?  The direction of movement was north to south, and the storms didn't need help from the mountains

Happy Weather!

Chuck George

KOLD NEWS 13

Yes.  We did get rain on Saturday.  And I don't disagree with his analysis, in fact I knew that, but why does it stop at the freeway? The freeway is far from the mountains. I have seen it to many times for it not to be something.  It is curious...