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Here are some UHF frequencies that are allocated for use by the NOAA:
410.1000 - Weather Link
410.1750
410.4750
410.5500
410.5750 - Weather Link
410.6750
410.7250
410.8500
410.8750
412.3250
415.8500
415.9000 - Weather Link
416.3750 - Weather Link
416.9750 - Weather Link
I have noted where I have heard the NOAA weather being linked to VHF transmitter sites.
So if you have trouble hearing the normal VHF NOAA Weather frequencies, give the UHF federal band a search!