Israel would be insane to use a nuke, tactical or otherwize within 300 miles of their own borders.
They can and would use 'em on anything that looked hostile beyond the 300 mile radiation buffer. Lil PITA countries like Iran, Iraq, Saudi Arabia and even Egypt west of the canal are no doubt zeroed in targets.
Scenario.. Syria attacks, using all available weapons along with heavy armor supplied and suported by Iraq or Iran. No doubt, they will employ chemical weapons, or threaten to do so. The saudi's and the Egyptians make sympathetic noises in support of syria, palestine and iraq. Israel pounds the syrian attack to shreads with their superior army and airforce, while spitting off 2 nukes to slap down Tehran and Baghdad. Then they eyeball Cairo and the Saudis... "you wanna be next??" and they go on about mopping up the syrians and for good measure they occupy Jordan and Lebannon too... this all becoming the new 'buffer zone'. Palestine becomes a null issue.
We need not waste another dime on supporting israel with 14 fediddlein million per day in aid. They can (and probably will very shortly) whip everybodys bellybutton in that region.. including ours should we stick our nose in. Lets not forget the USS Liberty.. they have no compunctions about shedding american blood to insure their ultimate goal... total domination of the middle east. Think about THAT.