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Due to the Frankenstorm nature of Sandy, there will be a confusing flow of information as the storm transitions from a tropical storm to a nor'easter:
They say that by using non-tropical watches and warnings, issued by local offices, they will avoid confusion, but I don't agree. I had already been wondering why the advisories hadn't been extended above North Carolina and the only way to figure out why is by reading this PDF. Worse, if the transition prediction is mis-timed:
This issue is too bad, IMO, because there is no concise tracking and informational source for just big storms. The NHC is an excellent resource -- I'm not sure what they do in the winter, but perhaps their responsibilities should be extended?
http://www.nhc.noaa.gov/news/20121027_pa_sandyTransition.pdfThe National Hurricane Center (NHC) issues advisories, forecasts, and warnings on tropical
cyclones - the generic term for hurricanes, tropical storms, and tropical depressions. Sometime
prior to making landfall, Hurricane Sandy is expected to lose its characteristics as a tropical
cyclone and take on the structure of a wintertime low-pressure area. Because the National
Hurricane Center only issues advisories on tropical cyclones, there will be changes in the flow of
information coming out of the NWS when this transition occurs...
Because Sandy is expected to make this transition before reaching the coast, the NWS has
been using non-tropical wind watches and warnings, issued by local NWS Weather Forecast
Offices (WFOs), to communicate the wind threat posed by Sandy in the Mid-Atlantic States and
New England. (This is why NHC’s tropical storm warnings extend only into North Carolina.)
The NWS plans to continue using non-tropical watches and warnings issued by local offices in
the Mid-Atlantic States and northward throughout this event. By using non-tropical warnings in
these areas from the start, we avoid or minimize the significant confusion that could occur if the
warning suite changed from tropical to non-tropical in the middle of the event.
When NHC determines that Sandy has become post-tropical, NHC advisory products will cease.
They say that by using non-tropical watches and warnings, issued by local offices, they will avoid confusion, but I don't agree. I had already been wondering why the advisories hadn't been extended above North Carolina and the only way to figure out why is by reading this PDF. Worse, if the transition prediction is mis-timed:
I'm not clear on what exactly that means, but it implies to me that even if Sandy makes landfall as a tropical storm, the NHC still won't be issuing watches/warnings.In the event Sandy remains a tropical cyclone through landfall, NHC advisories and products
would of course continue. There would be no transition, however, from non-tropical wind
warnings issued by the WFOs back to Tropical Storm or Hurricane Warnings issued by
NHC, since both sets of warnings describe the same wind hazard.
This issue is too bad, IMO, because there is no concise tracking and informational source for just big storms. The NHC is an excellent resource -- I'm not sure what they do in the winter, but perhaps their responsibilities should be extended?
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