Public Information Statement
Issued by NWS National HQ
Issued by NWS National HQ
243 NOUS41 KWBC 221900 AAA PNSWSH Service Change Notice 25-59 Updated National Weather Service Headquarters Silver Spring MD 300 PM EDT Fri Aug 22 2025 To: Subscribers: -NOAA Weather Wire Service -Emergency Managers Weather Information Network -NOAAPort Other NWS Partners, Users and Employees From: Timothy Greten Director, NWS Office of Central Processing Subject: Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment effective immediately Effective immediately, this notice was updated to include a change to keep the WSR88D/TDWR radar data on the NMC channel which includes the following WMO headers: NXUS6[1-6] K* NXUS6[0789] P* NXUS6[0-9] T* SDUS2[1-6] K* SDUS2[1-6] P* SDUS2[0789] P* SDUS3[1-6] K* SDUS3[1-6] P* SDUS3[0789] P* SDUS5[1-6] K* SDUS5[1-6] P* SDUS5[0789] P* SDUS6[1-6] K* SDUS6[1-6] P* SDUS6[0789] P* SDUS7[1-6] K* SDUS7[1-6] P* SDUS7[0789] P* SDUS8[1-6] K* SDUS8[1-6] P* SDUS8[0789] P* SDUS[0-9][0-9] T* Previous SCN content issued Aug 1, 2025, also available here: https://www.weather.gov/media/notification/pdf_2025/scn25- 59_channel_realignment_to_SBN_no3.pdf The NWS has studied the existing NOAAPort/SBN/NWWS channel alignment, bandwidth usage, prioritization, and delay times. This study identified that reorganizing the data on the various channels would improve the timeliness of distributed products. The changes were divided into three phases. The previous two changes were implemented: Phase 1: migrating all grib, grib2, and bufr formatted data from the NMC channel to the NMC2 channel per this SCN: https://www.weather.gov/media/notification/pdf_2023_24/scn24- 54_channel_realignment_to_SBN_aaf.pdf Phase 2: placing Canadian Radar data on the SBN per this SCN: https://www.weather.gov/media/notification/pdf_2023_24/scn24- 100_channel_realignment_to_SBN_2.pdf The final change, phase 3, will realign some of the SBN channels and the data on them: 1) Move the priority of channel EXP up to #1 (2nd Highest). See the table farther below for the changes to the channels 2) Move some Radar related data on the SBN to the EXP channel. This includes the following on the NMC channel: WSR88D/TDWR Radar: NXUS6[1-6] K* NXUS6[0789] P* NXUS6[0-9] T* SDUS2[1-6] K* SDUS2[1-6] P* SDUS2[0789] P* SDUS3[1-6] K* SDUS3[1-6] P* SDUS3[0789] P* SDUS5[1-6] K* SDUS5[1-6] P* SDUS5[0789] P* SDUS6[1-6] K* SDUS6[1-6] P* SDUS6[0789] P* SDUS7[1-6] K* SDUS7[1-6] P* SDUS7[0789] P* SDUS8[1-6] K* SDUS8[1-6] P* SDUS8[0789] P* SDUS[0-9][0-9] T* Canadian Radar: SDCN01 CWAO Caribbean Radar: PAHM44 * 3) MRMS data on the NMC2 channel to the EXP Channel CONUS: YAUC01 KWNR YAUE01 KWNR YAUE04 KWNR YAUE06 KWNR YAUE09 KWNR YAUE10 KWNR YAUF01 KWNR YAUP01 KWNR YAUP02 KWNR YAUP03 KWNR YAUP04 KWNR YAUP06 KWNR YAUQ01 KWNR YAUS04 KWNR YAUS06 KWNR YAUS09 KWNR YAUS10 KWNR YAUS11 KWNR YAUS15 KWNR YAUS16 KWNR YAUS22 KWNR ALASKA: YAAC01 KWNR YAAP02 KWNR YAAP03 KWNR YAAP04 KWNR YAAP06 KWNR HAWAII: YAHP02 KWNR YAHP03 KWNR YAHP04 KWNR YAHP06 KWNR 4) Probabilistic Storm Surge (P-Surge) data on the NMC2 channel to the NMC Channel YA[B-P][A-F][0-2][0-9] KWEV YC[A-K][A-F][0-2][0-9] KWEV YD[A-K][A-F][0-2][0-9] KWEV YE[A-E,I][A-F][0-2][0-9] KWEV YG[A-E,I][A-F][0-2][0-9] KWEV YH[A-E,I][A-F][0-2][0-9] KWEV 5) Move all data previously on EXP and GOES channels to NMC3 IXTA89 KNES IXTA99 KNES IXTB89 KNES IXTB99 KNES IXTC89 KNES IXTC99 KNES IXTD89 KNES IXTD99 KNES IXTF89 KNES IXTF99 KNES IXTG89 KNES IXTG99 KNES IXTH89 KNES IXTH99 KNES IXTI89 KNES IXTI99 KNES IXTJ89 KNES IXTJ99 KNES IXTK89 KNES IXTK99 KNES IXTL89 KNES IXTL99 KNES IXTM89 KNES IXTM99 KNES IXTN89 KNES IXTN99 KNES IXTO89 KNES IXTO99 KNES IXTP89 KNES IXTP99 KNES IXTQ89 KNES IXTQ99 KNES IXTR89 KNES IXTR99 KNES IXTT89 KNES IXTT99 KNES IXTU89 KNES IXTW01 KNES IXTW81 KNES IXTX01 KNES IXTX81 KNES IXTY01 KNES IXTY81 KNES 6) Lower the priority of the GOES channel and reallocate the bandwidth to the EXP / Radar channel Migration of this data requires changing the bandwidth available for a few channels. The table below summarizes the changes to channel priority and bandwidth. This information can also be found on the NOAAPort page: (https://www.weather.gov/noaaport/) Current: ============================================ Channel | Pri | Bandwidth | Port | PID ============================================ NMC |0 | 20 Mbps | 1201 | 101 GOES |1 | 3.5 Mbps | 1202 | 102 GRW |2 | 15 Mbps | 1209 | 107 GRE |3 | 15 Mbps | 1210 | 108 ADD (NBM) |4 | 30 Mbps | 1206 | 151 NMC2 |5 | 30 Mbps | 1203 | 103 NOAAPORT_OPT |6 | 2 Mbps | 1204 | 104 NMC3 |7 | 6 Mbps | 1205 | 105 EXP |8 | 10 Mbps | 1208 | 106 ENC |9 | 0 Mbps | 1207 | 150 NWWS | N/A | 750 Kbps | 1201 | 201 ============================================ New: ============================================ Channel | Pri | Bandwidth | Port | PID ============================================ NMC |0 | 15 Mbps | 1201 | 101 EXP (RDR) |1 | 35 Mbps | 1208 | 106 GRW |2 | 15 Mbps | 1209 | 107 GRE |3 | 15 Mbps | 1210 | 108 ADD (NBM) |4 | 30 Mbps | 1206 | 151 NMC2 |5 | 30 Mbps | 1203 | 103 NOAAPORT_OPT |6 | 5 Mbps | 1204 | 104 NMC3 |7 | 10 Mbps | 1205 | 105 ENC |8 | 0 Mbps | 1207 | 150 GOES |9 | 0 Mbps | 1202 | 102 NWWS | N/A | 750 Kbps | 1201 | 201 ============================================ This data is expected to move on or about 1400 Coordinated Universal Time (UTC) August 22, 2025. If a Critical Weather Day has been issued, this change will be postponed until 1400 UTC on the next non-Critical Weather Day. No change is expected to the data feed at the receiver. If no issues are experienced, the configuration will remain in place. If any issues are identified, the changes will be evaluated, and a new implementation date will be determined. We encourage all NOAAPort/SBN/NWWS users to closely monitor this Service Change Notice (SCN) during the transition period for updated information. If you have any questions or concerns, please contact the focal points below: Paul Kirkwood NOAA/NWS Southern Region Headquarters Email: paul.kirkwood@noaa.gov Andy Just NOAA/NWS Office of Central Processing Email: andy.just@noaa.gov James Glenn NOAA/NWS Office of Central Processing Email: james.glenn@noaa.gov National Service Change Notices are online at: https://www.weather.gov/notification