Mastodon bots which mirror the NWS warnings back them up
What failed was local officials not succeeding in alerting people — in large part because they had plan or mechanism available to do so with the roughly one-hour warning that current meteorology can provide for specific flash floods like this.
Archived copies of the article:
Where I live, we’ve gotten alerts at 2 or 3 am because someone shot at police in a completely different city an hour or two away.