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Service Change Notice 24-34 Updated
National Weather Service Headquarters Silver Spring MD
430 PM EDT Wed Apr 17 2024

To: Subscribers:
 -NOAA Weather Wire Service
 -Emergency Managers Weather Information Network
 -NOAAPort
 Other NWS Partners and NWS Employees

From: Ajay Mehta
 Director, NWS Office of Observations

Subject: Updated: NOAA-21 NUCAPS Soundings to be Added to the
Satellite
 Broadcast Network (SBN) on Near April 29, 2024

Updated for implementation date moved from April 29 to May 9, 2024.

On or near May 9, 2024, NOAA-Unique Combined Atmospheric Processing
System
(NUCAPS) soundings from the NOAA-21 polar-orbiting satellite will be
added
to the Satellite Broadcast Network (SBN).

NUCAPS estimates atmospheric temperature and moisture at 100 pressure
levels between the earth`s surface and the upper atmosphere, about an
hour
after local solar noon in each location. NOAA-21 NUCAPS soundings
provide
insight into the early-afternoon pre-convective environment,
complementing
the mid-morning soundings of the Metop-C satellite.

Each NOAA-21 NUCAPS file (granule) spans about 30 seconds of time
(about
200 granules per orbit) and samples an area roughly 2100km by 200km
with
a
grid of 30 x 4 = 120 atmospheric soundings. Each of these soundings
estimates the following atmospheric parameters at 100 vertical
levels:

Parameter     Units
--------------------------  ----
Pressure     mb
Air temperature      K
Liquid water mixing ratio    g/g
Water vapor mixing ratio     g/g
Ozone mixing ratio     ppb
Sulfur dioxide mixing ratio  ppb

NOAA-21 NUCAPS soundings on SBN will amount to 1,800 files/day and
0.38
GB/day. They will be broadcast via the SBN NMC3 channel (Port 1205,
PID
105) using the following WMO header codes:

IUTN11 KNESIUTN14 KNESIUTN17 KNES
IUTN12 KNESIUTN15 KNESIUTN18 KNES
IUTN13 KNESIUTN16 KNESIUTN19 KNES

These codes are also used for NOAA-21 NUCAPS. They correspond to
the
geographic regions previously detailed in SCN19-59
(https://www.weather.gov/media/notification/pdf2/scn19-
59nucaps_soundings.pdf)

Additional details on NUCAPS soundings from NOAA-21 and other
satellites
are available on the NOAA VLab at
https://vlab.noaa.gov/web/towr-s/jpss-
nucaps.

Critical weather, enhanced caution, or other factors may affect the
timing
of this change.

For questions pertaining to these changes, please contact:

    NOAA/NWS Office of Observations
    Silver Spring, MD
    Email: NWS-OBS-Satellites@noaa.gov
  or
    AWIPS Network Control Facility (NCF) Help Desk
    NOAA/NWS Office of Central Processing
    Silver Spring, MD
    Phone: 888-808-8624

For questions regarding the content or distribution of the products
listed
here please contact:

    Joseph V. Fiore Jr.
    NOAA/NESDIS/OSPO/Satellite Products and Services Division
    College Park, MD
    email: joseph.fiore@noaa.gov
    Google Voice: 240-622-5819

National Service Change Notices are online at:

https://www.weather.gov/notification/