They will probably wait for the next model runs to come out before shifting their forecast.
That may or may not help them any, depending on what fudgefactor, er I mean, model they use...
The 6-7 inches of congealed glowbull warmthing that I just finished removing from my drive was only supposed to be 1-3". And they stuck with that amount even after we had 4" on the ground...
Strangely, the total was then quietly revised to 4 - 6".. And as the total was quickly reaching that 6" mark they added another phrase - "possibility of locally higher amounts".
Nothing like covering all the bases, eh?