[nws-changes] Fwd: amended aviaiton model output ADMIN NOTICE NOUS41 KWBC

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NOUS41 KWBC 101228
PNSWSH
Technical Implementation Notice 11-46 AAB 
National Weather Service Headquarters Washington DC
828 AM EDT Tue Jul 10 2012
To: Subscribers: 
          - Family of Services
          - NOAA Weather Wire Service
          - Emergency Managers Weather Information Network
          - NOAAPORT
          Other NWS partners, users and NWS employees
From: Tim McClung 
          Science Plans Branch Chief
          Office of Science and Technology
Subject: Amended: Changes to Localized Aviation Model Output 
          Statistics Program (LAMP) Products:  Effective
          July 17, 2012.
Amended to set the implementation date for Tuesday, July 17, 
2012. Users are cautioned that if a Critical Weather Day (CWD)
designation is in effect on July 17, this implementation will be
delayed until the conclusion of CWD.  You can monitor the CWD
status at the following webpage:
http://www.nco.ncep.noaa.gov/pmb/cwd/ 

Effective on Tuesday, July 17, 2012, beginning with the 1600
Coordinated Universal Time (UTC) run, the NWS Meteorological
Development Laboratory (MDL) will update the Localized Aviation
Model Output Statistics Program (LAMP) system.

The LAMP changes include:
1. Replacing the current LAMP total sky cover guidance with 
new opaque sky cover guidance, which is dependent on cloud
opacity.
The LAMP sky cover guidance predicts an estimate of the total 
percentage of the sky covered by clouds in terms of the five
categories reported in the METAR observations: clear, few,
scattered, broken, or overcast. The current LAMP total sky cover
guidance does not distinguish between opaque and translucent
cloud cover.
The new LAMP sky cover will produce an estimate of opaque clouds. 
The anticipated effect of this change will be to decrease the
number of broken or overcast forecasts and to increase the number
of clear or few forecasts when only cirrus clouds are expected.
This change will make the LAMP guidance consistent with both the
NWS definition of sky cover, as well as the Global Forecast
System (GFS)-based MOS definition of sky cover. See TIN 07-34 for
details on GFS-based MOS opaque sky cover change.
http://www.nws.noaa.gov/os/notification/tin07-34juncloud.txt The LAMP total sky cover currently available in the LAMP public 
text bulletins (known by their AWIPS ids LAV) and labeled as CLD
will be replaced with the LAMP opaque sky cover. The CLD label
will not change. Likewise, the LAMP total sky cover currently
available in the BUFR message will be replaced with the LAMP
opaque sky cover. This change to the LAMP BUFR message will be
transparent to users with no changes to the descriptors in the
BUFR file.
2. Redeveloped ceiling height and conditional ceiling height 
equations to produce improved forecast guidance.
3. NWS will add 119 stations to the LAMP text bulletins and BUFR 
products. These changes will be reflected in the new equations
for opaque sky cover, and the redeveloped ceiling height and
conditional ceiling height equations. These changes will also be
reflected in the guidance for the following elements:
Precipitation occurring on the hour 
Precipitation in a 6-hour period
Precipitation in a 12-hour period
Thunderstorms in a 2-hour period
Precipitation type
Visibility
Conditional visibility
Obstruction to vision
These changes will slightly alter the format of the LAV text 
products because new lines will be added to the existing
bulletins to accommodate the new stations. In addition, some
stations might not have had guidance for all of the above
elements prior to this change, and with this change, guidance
will now be produced for those elements for those stations.
These changes will also alter the contents of the LAMP BUFR 
messages because new guidance will be available. The
communication identifiers for the text and BUFR products are
shown in Tables 1 and 2 below.
Table 1: Communication identifiers for the GFS-based LAMP 
products in ASCII format. Listed below are the WMO heading and
the AWIPS identifier.
WMO heading AWIPS ID 
-----------     --------
FOUS11 KWNO     LAVUSA
Table 2: Communication identifiers for the GFS-based LAMP 
products in BUFR format.  Listed below are the WMO headings.
WMO heading Region 
-----------     ------
JSMF10 KWNO     LAMP BUFR Pacific Region
JSMF11 KWNO     LAMP BUFR Northeast Region
JSMF12 KWNO     LAMP BUFR Southeast Region
JSMF13 KWNO     LAMP BUFR North Central Region
JSMF14 KWNO     LAMP BUFR South Central Region
JSMF15 KWNO     LAMP BUFR Rocky Mountains Region
JSMF16 KWNO     LAMP BUFR West Coast Region
JSMF17 KWNO     LAMP BUFR Alaska Region
A Web page providing additional details of these changes, 
including a link to the list of new stations, is online at:
www.nws.noaa.gov/mdl/gfslamp/docs/change_notice_01242012.php If you have technical comments or questions, please contact: Judy Ghirardelli 
National Weather Service
Meteorological Development Laboratory
Judy.Ghirardelli@xxxxxxxx
301-713-0056 x194
Links to the LAMP products and descriptions can found at: http://www.nws.noaa.gov/mdl/gfslamp/gfslamp.shtml National Public Information Statements are online at: http://www.weather.gov/os/notif.htm $$
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