on yesterday's news coverage, some family who sheltered at home and their first floor flooded ended up facetiming with the local news to ask for help on the air.
The response from officials? Get to highest level of your house and we'll get to you in a few days.
People have battery backups for their mobile devices, and cell service is typically spotty - but intermittently available - in these situations. They'll find out what they need when they reach out to family/friends/news outlets/etc.