[EAS] NWS Impact Based Warnings

[Mike McCarthy]

In severe weather alley (south of the 45th parallel, west of I-75 to the
mountains and Gulf Coast), it's not uncommon to have cascading severe
weather events. Especially in the mid to late summer where you can have
multiple events in a single day.

When you have SVR WX event after SVR WX event, it gets really old fast. 
Last year, we had a stretch where my Sage log spanned 4 pages of received
alerts. I expect the same thing to occur this year.

MM

> SBE Chapter One tends to visit the National Weather Service Binghamton
> (BGM) office each year for a SkyWarn session and the presenter went over
> some of this with us.  If I recall correctly, they started in a small
> region last year and are slowly expanding it to make sure it works and
> scales.
>
> As for message flooding, our local forecast warning office is very