*** Hi.  What you seem to be describing are Simple Partial Seizures
(auras) triggered by either the noise or are there Flashing Lights on
the screen?  Do you have a Remote TV Control, so you can change
channels when that happens, or Look Away when it starts until it's
done? (plug ears if it's the noise)
   Several of the szr. types can be triggered by Flashing lights (like
strobes).  If you can find an Email address for them you could write
them (online) and tell them what the Warning does for People with
Seizures (7% of their potential audience).  *My (Canada) channel has a
www address to report Local Conditions as it's a National Weather
channel/covering 6+ timezones, and I could report that sort of thing to
That www, and explain what it could be doing to 1 person in 15 or 30?
(depending which website is used--> that's potentially 3 to 7% of their
Audience **gone for the rest of that day). Some stations *care how many
people are watching the commercials between forecasts, as above--
determines how much they charge.
 If it's Noise Signal, rather than Flashing on the TV that seems to be
a Trigger for you, they might want to turn that off, as it's not needed
to get someone's attention, *or if you have a Mute Button (on a remote)
when it starts, if someone Hits the Mute it will cut out the *Sound.
Look AWAY from the screen for 30-60 seconds until the full warning is
passed, OR change Channels and use a Radio to hear Weather news.

 Moving to another (non-BBC?) channel, for the next 3? hours to one
that doesn't do that, will Lose their Audience for that period of time.
(Sponsors *pay by the no. of people per Hour who watch -- if they're
Losing at audience, they'll lost the Income to get their "Important
Disruptive message" out.  )

   If you have a Video machine, that might be a good time to watch a
Movie until weather warnings have passed. Hope that helps. If you still
have older links I posted Late Dec./Early Jan., Julie's Idaho website
(and I think Howdy Dave's) have a First Aid Chart with specific
remedies depending on the seizure type-- symptoms common with each type
are listed. I think there's "Printable page" icon-- it takes out
graphics, just lets you print a text page, without any (still) graphics
that might be there.
  You'll note on charts that Shaking Someone to bring them back isn't
always the best solution as it can produce headaches or a rougher
return to 'Normal'  than by turning off the Trigger. Hope that helps.
G./

I have heard of a few cases of sonic induced seizures...was even
mentioned briefly on "House M.D."  Typically it is a loud, modulating
sound or tone that triggers a [partial] seizure starting in the
auditory processing area of the brain, and can sometimes cascade into
a general seizure [rare].  

Here are some triggers that has effected a girlfriend.

- Car Alarm going off outside the window
- Watching a movie in the theater - the film jammed up and the sound
was a rapid thudding noise...  I caught it kinda quickly and rushed
her out of the theater.