This maximum was evidently caused by a broad ribbon of large grains the brightest fireballs which were reported were around 100g in mass, quite amazing for a meteor shower. Hopefully we will encounter it again next year, although it will be best observed from America. Technically, the Leonid reached sub-storm level during this maximum. However, because of the number of very bright meteors, the activity appeared a lot more spectacular. To sum up Historical precedent from the 1960s suggests that there is a possibility of seeing storm activity in 1999, despite the relatively weak principal maximum observed in 1998.
Intermediate values are less unlikely.
It all depends on whether or not we hit the same part of the Leonid stream, or a much richer vein. Nothing like it appears to have been seen previously, so it is difficult to guess what its future behaviour may be like. This maximum is most like to be seen from America in 1999.