Admittedly my info is several years old, but an acquaintance of mine that is former IDF told me that Israel has 50 - 60 short and intermediate range ballistic missiles with nuke warheads (a few with MIRV capability) in hardened silos concealed very ingeniously around the country. Additionally they have between 60 and 80 airdrop weapons, and lastly have developed nuke-tipped cruise missiles for the new subs that are being built for them by the Germans.
Assuming this to be the case, their capability is nearly equivalent to India, and substantially greater than China, and Pakistan. Further assuming that their average warhead is somewhere in the 100 - 200 kiloton range, they have more than enough capability to make Iran uninhabitable for a few centuries, as well as most of the rest of the arab world. Further, they have been at this for several decades, and know how to properly maintain a nuclear arsenal at its peak effectiveness, unlike the "newcomers" to the club. I suspect that Israel is very nearly equal in capability to the US in the ability to design and build these weapons.
I further have no doubt whatsoever, that if Israel were attacked with a nuclear weapon from one of its arab neighbors, the war would likely be over before we heard that it was happening.......no need for us to get involved, other than providing aid to the survivors......
I acknowledge that Israel has kept their capability close to the vest to avoid the inevitable great outcry from the UN and their willing accomplices, but if I were the PM, I think I would make a tourist attraction out of a few sites, just for fun.......but that's just me.
doc