Why Storm-Based Warnings?
The National Weather Service (NWS) mission is
defined as the provision of weather forecasts and
warnings for the protection of life and property and
the provision of weather information for the
Nation’s economic well-being. The NWS previously
issued and disseminated warnings for tornado, severe
thunderstorm, flood and marine hazards using
geopolitical boundaries. Realizing the continuing
need to improve the specificity and accuracy of
warnings for tornadoes, severe thunderstorms, floods
and marine hazards, the NWS currently implements
Storm-Based Warnings (as
of October 1, 2007). Note: Storm based
warnings are not yet implemented in Shelby or
Jefferson County Emergency Management Agencies.
Storm-Based Warnings
(threat-based polygon warnings), are
essential to effectively warn for severe weather.
Storm-Based Warnings show
the specific meteorological or hydrological threat
area and are not restricted to geopolitical
boundaries. By focusing on the true threat area,
warning polygons will improve NWS warning accuracy
and quality. Storm-Based
Warnings will promote
improved graphical warning displays, and in
partnership with the private sector, support a wider
warning distribution through cell phone alerts,
pagers, web-enabled Personal Data Assistants (PDA),
etc. NOAA Weather Radios will work as before and
continue to alert entire counties.
http://www.weather.gov/sbwarnings/
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