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-------- Original Message --------
983
NOUS41 KWBC 172005
PNSWSH
Technical Implementation Notice 12-28
National Weather Service Headquarters Washington DC
405 PM EDT Thu May 18 2012
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
-Other NWS Partners, Users and Employees
From: Matthew Peroutka
Chief, Product Generation Branch
Office of Science and Technology
Subject: Implementation of Ensemble Kernel Density Model
Output Statistics Effective May 29, 2012
Effective on or about Tuesday, May 29, 2012, beginning at 1200
Coordinated Universal Time (UTC), Ensemble Kernel Density Model
Output Statistics (EKDMOS) will be implemented on NOAAs Central
Computing System. EKDMOS uses output from the North American
Ensemble Forecast System (NAEFS) to produce probability
distributions of sensible weather elements. The EKDMOS CONUS
(Alaska) products contain guidance on a 2.5 km Lambert Conformal
(3.0 km Polar Stereographic) grid. These grids cover the same
expanse as the corresponding National Digital Forecast Database
grids. Grids will be generated twice daily, based on the 0000 and
1200 UTC runs of the NAEFS. To express the probability
distribution, grids will be produced for the ensemble mean and
for these 11 non-exceedance probability levels:
.05, .10, .20, .30, .40, .50, .60, .70, .80, .90, and .95
The following surface weather elements and time projections will
be available initially:
- 2-m temperature guidance every 3 hours for days 1 to 8,
then every 6 hours for days 8 to 10 for the ensemble
mean and 11 non-exceedance probability levels
- 2-m dewpoint guidance every 3 hours for days 1 to 8,
then every 6 hours for days 8 to 10 for the ensemble
mean and 11 non-exceedance probability levels
- Daytime maximum temperature guidance for days 1 to 14
for the ensemble mean and 11 non-exceedance probability
levels
- Nighttime minimum temperature guidance for days 1 to 14
for the ensemble mean and 11 non-exceedance probability
levels
Additional weather elements will be added in the future.
A web page outlining the EKDMOS products and the NWS server
directory and file structure can be found online at:
http://www.mdl.nws.noaa.gov/~naefs_ekdmos
The grib2 products will be provided as part of the National
Digital Guidance Database (NDGD). These products will initially
be available on the NWS ftp server at:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.mo
sekd/AR.conus
and:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.mo
sekd/AR.alaska
On a date to be announced, these products will be disseminated
across the Satellite Broadcast Network (SBN) and NOAAPORT.
Table 1: Communication Identifiers for the EKDMOS Grib2
Products for CONUS
WMO HEADING ELEMENT
LEXXXX KMDL 2-Meter Temperature
LFXXXX KMDL 2-Meter Dew Point Temperature
LGXXXX KMDL Daytime Maximum Temperature
LHXXXX KMDL Nighttime Minimum Temperature
Table 2: Communication Identifiers for the EKDMOS Grib2 Products
for Alaska
WMO HEADING ELEMENT
MEXXXX KMDL 2-Meter Temperature
MFXXXX KMDL 2-Meter Dew Point Temperature
MGXXXX KMDL Daytime Maximum Temperature
MHXXXX KMDL Nighttime Minimum Temperature
Each grib2 element and probability has a unique WMO header. The
table above lists representations of the WMO headers. A complete
list of EKDMOS WMO headers is available at:
http://www.mdl.nws.noaa.gov/~naefs_ekdmos/EKDMOS_WMO_Headers.pdf
A web page outlining the EKDMOS guidance and the ftp server
structure can be found online at:
http://www.mdl.nws.noaa.gov/~naefs_ekdmos/
For questions regarding the new EKDMOS guidance please contact:
John Wagner
MDL/Silver Spring, Maryland
301-713-0056, Ext. 187
John.L.Wagner@xxxxxxxx
NWS national Technical Implementation Notices are online at:
http://www.weather.gov/os/notif.htm
$$
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