Becoming larger
growing, developing, maturing, multiplying, proliferating, broadening, widening, augmenting, waxing, sprouting, flourishing, rising, ever-widening, expanding, branching out, enlarging, accumulating, piling up, doubling, crescent, shooting up, getting big, swelling, spiraling, snowballing, on the rise, on the increase, on the upgrade, booming; see also growing.
Becoming more intense
intensifying, heightening, escalating, growing, dominant, advancing, getting louder, sharpening, accentuating, aggravating, emphasizing, accelerating, deepening, building, building up, revving up*.