Dress Rehearsal.

       Inevitable.  It's a Universal LAW - It MUST rain on Mayday in Penrith.  I've lost total track of how many days/weeks since last rain.  I certainly can't remember this ever being so anhydrous.
       Not that 5mm is much, it's jut the design of the gauge to enable a reading with so little rain.  I think it's "rained" more dust than water - wash out on the cards.