Yes, this is a problem down here in hurricane country too. There are a few battery powered digital TVs but they are rather expensive. I'm sure in time they will be more and cheaper- but they will never be as cheap as analogs because more circuitry is required to decode digital.
But most all the TV stations down here have their audio repeated on one or more local radio stations during weather emergencies so while you may not get to see radar pictures you can get most info by listening to the audio repeated on a radio.
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