Everlasting:

[Leanne]

Black heralded in the storm-- heralding the storm is overdone, especially with black
Low minacious clouds argued "minacious" is a terrific word but starting that line with "low" does you no favours in the sonics department -- maybe get rid of it altogether, or try "minacious clouds lowered"
thumping chests and roaring. you might want to ease up on the -ings
Throaty obscenities flew
within cumulonimbus.
just two seconds after blue nice use of casual rhyme

Kids swam streets, oblivious
power lines lay limp. Unlit
tipper trucks ploughed the water, the punctuation in these three lines is very off-putting -- if you wrote these out in sentences you'd be horribly confused, so there's no point doing it in a poem. I mean, "oblivious power lines" and "unlit tipper trucks"? WTF?
loaded to the gunnel's, high gunwales
enough for human debris
to be carried from their roofs.

Once, it cleared and lightness sprang. if you use a full stop, you need a capital letter on the next line
floods grew weak and settled down, "grew weak" is... well, weak
people cheered, defences down.
All too soon the laughter died:
Anger raced across the sky a little overdone, maybe not to the point of cliche but there could be a revision here, especially on "raced across the sky"
then dropped like rods of iron.

Again it rained. great dramatic ending