NOUS41 KWBC 011157



Technical Implementation Notice 11-42

National Weather Service Headquarters Washington DC

755 AM EDT Thu Sep 1 2011


To:          Subscribers:

                -Family of Services

                -NOAA Weather Wire Service

                -Emergency Managers Weather Information Network


                Other NWS Partners, Users and Employees


From:     Tim McClung

                Chief, Science Plans Branch

                Office of Science and Technology


Subject:   Real-Time Mesoscale Analysis to Become Operational:    

                          Effective October 4, 2011


Effective Tuesday, October 4, 2011, with the 1200 Universal Coordinated Time (UTC) cycle, the Real-Time Mesoscale Analysis (RTMA) will be upgraded from experimental to operational status.  These elements have been available experimentally from the National Centers for Environmental Prediction (NCEP) since 2006.


The RTMA is a set of gridded surface analyses for the elements listed in Table 1 below. NCEP uses all readily-available satellite, ASOS, METAR, mesonet, buoy, ship and other surface or near-surface sensor data that can be gathered in near-real time to generate the RTMA. Analyses are generated for CONUS at 5 and 2.5 km, Alaska at 6 km, and Hawaii, Puerto Rico, and Guam at 2.5 km. All of these fields for all of the resolutions listed above are currently disseminated on NOAAPORT. 


The transition to operational status will not affect these NOAAPORT products because they will keep their current WMO headers as listed below.


RTMA grids are also available in the National Digital Guidance Database (NDGD) for the domains listed above, except for the CONUS, for which only 2.5 km horizontal resolution RTMA grids are available. When moved to operational status, the location of the RTMA grids will move from:



The filenames on NDGD will stay the same during this transition. 


Table 1:  WMO Headings Assigned to the RTMA grids available on NOAAPORT at 5 km and 2.5 km horizontal resolution




LT*A98 KWBR     temperature analysis

LT*A98 KWBR     temperature analysis uncertainty

LR*A98 KWBR     dewpoint temperature analysis

LR*A98 KWBR     dewpoint temperature analysis uncertainty

LN*A98 KWBR     wind speed analysis

LN*A98 KWBR     wind speed analysis uncertainty

LN*A98 KWBR     wind direction analysis

LN*A98 KWBR     wind direction analysis uncertainty

LU*A98 KWBR     u wind component analysis (NOAAPORT ONLY)

LV *A98 KWBR     v wind component analysis (NOAAPORT ONLY)

LP*A98 KWBR     surface pressure analysis
LP*A98 KWBR     surface pressure analysis uncertainty
LH*A98 KWBR     RTMA model terrain height

LEMA98 KWBR     Accumulated precipitation (5km for CONUS only)

LEIA98 KWBR     Accumulated precipitation (2.5km for CONUS only)

LAMA98 KWBR     GOES effective cloud amount (CONUS only)


Where * is A for Alaska , C for Puerto Rico, G for Guam, H for Hawaii , I for 2.5km CONUS, M for 5km CONUS.



For questions regarding these changes, please contact:


    Geoff DiMego

    NCEP/EMC Mesoscale Modeling Branch

    Camp Springs , Maryland

    301-763-8000 x 7221


NWS National Technical Implementation Notices are online at: