NOUS41 KWBC 071531
PNSWSH

Service Change Notice 11-17 
National Weather Service Headquarters Washington DC
1128 AM EDT Thu Apr 7 2011

To:       Subscribers:
         -Family of Services
         -NOAA Weather Wire Service
         -Emergency Managers Weather Information Network
         -NOAAPORT
         Other NWS partners and NWS employees

From:    Therese Z. Pierce
         Chief, Marine and Coastal Services Branch

SUBJECT: Probabilistic Tropical Cyclone Storm Surge Exceedance
         Products Become Operational: Effective June 1, 2011

Effective June 1, 2011, the Tropical Cyclone Probabilistic Storm 
Surge Exceedance products will become operational.  The products 
provide storm surge heights, in feet above normal tide level, and 
the probabilities, from 10 to 90 percent at 10 percent 
increments, of storm surge exceeding the displayed height.  
 
The products are produced when a hurricane watch or warning are 
in effect for any portion of the Gulf or Atlantic coasts of the 
continental United States. The products will be posted online at:

	http://www.weather.gov/mdl/psurge

GRIB2 and ESRI shape files will be available at this web site by 
clicking on the download tab. 

GRIB2 files will also be available on NOAAPORT with the following 
WMO headers:

LGXP10 KNHC   10 percent chance of exceedance
LGXP20 KNHC   20 percent chance of exceedance
LGXP30 KNHC   30 percent chance of exceedance
LGXP40 KNHC   40 percent chance of exceedance
LGXP50 KNHC   50 percent chance of exceedance   
LGXP60 KNHC   60 percent chance of exceedance
LGXP70 KNHC   70 percent chance of exceedance
LGXP80 KNHC   80 percent chance of exceedance
LGXP90 KNHC   90 percent chance of exceedance

In addition, the GRIB2 products will be available in the National 
Digital Guidance Database (NDGD). The directory of where the 
products can be found will change as from:

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.sl
osh/AR.conus/

To (effective June 1, 2011):

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.sl
osh/AR.conus/

No change in the file names will occur. The GRIB2 file names of 
ds.surgeexcdNN.bin, where NN is the exceedance probability 10 
through 90 percent in increments of 10, will continue to be used.  

If June 1, 2011 is declared a Critical Weather Day by the 
National Centers for Environmental Prediction, the implementation 
date for transitioning the storm surge probabilities in the NDGD 
to operational will be postponed.  Users will be notified of that 
decision via another Technical Implementation Notice and a new 
implementation date will be established.

If you have any questions, please contact

   John Kuhn
   National Weather Service
   Silver Spring, Maryland 20910
   301 713 1677 extension 121
   John.F.Kuhn@noaa.gov

National Service Change Notices are online at:

   http://www.nws.noaa.gov/om/notif.htm

$$
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