On Jul 25, 1:22 pm, RHF wrote:
790 kHz - NOAA Weather Radio being Heard - SF Bay Area

Continous Loop {Cycled} Broadcast of NOAA Weather Radio

S-Meter : Constant S5 with Fair Audio
-but- NO Top-of-the-Hour ID at 20:00 UTC / 1:00 PM PDT

SOURCE - 790 KCOR CA, Richmond - 9/21 @ 2145
new emergency radio TIS (K-City of Richmond), mostly
relaying NOAA VHF weather radio KHB49; intended to
broadcast warnings of industrial accidents. (AWP-CA)http://www.hard-core-dx.com/archive/1995/msg00292.html

For those unfamiliar with Richmond, it's a largely industrial area.
The residents tend to be black and poor. The shoreline is lined with
oil refineries and other nasties. It is not far from Oakland, which is
why RHF can hear it. The weather radio is just a placeholder to keep
the tx busy. In most of the nation VHF weather radio is used to warn
of disasters, but Richmond residents cannot afford NOAA weather radios
even if they knew about them, and unlike in tornado alley weather
radios are hard to find in California. Frys sells them, but most
Richmond residents cannot get to a Frys. I don't know how many have MW
radios, considering the fact that most New Orleans residents did not
have battery operated radios.