[Skywarn] GOES-15 drift

[Lloyd Colston]

Subject: GOES-15 (GOES-West) Satellite Drift to 128-degrees West
         Commencing 2015 UTC, October 23, 2018

The GOES-West satellite transition from GOES-15 to GOES-17 is
scheduled to commence at 2015 UTC, October 23, 2018, with the drift
of GOES-15 from 135 to 128-degrees west.  The transition is scheduled
to be completed on December 10, 2018, with GOES-17 declared as the
operational GOES-West satellite.

The GOES-15 EMWIN transponder will remain operational throughout the
0.88-degree/day drift to 128-degrees west.  Receiving stations with
fixed antenna installations are likely to experience degradation or
loss of signal lock should the satellite move outside the receiving
antenna’s effective beam width.  Users should consider incrementally
re-orienting their antennas to maintain an effective signal-to-noise
ratio and signal lock during the GOES-15 drift.

The schedule of events for GOES-15 and GOES-17 is provided below.
Additional details are available from the NESDIS web
site:https://www.goes-r.gov/users/transitionToOperations17.html

DATES        EVENTS                         NOTES
-----------  -----------------------------  -------------------
OCT23–NOV01  - GOES-15 drift from 135 to    - All instruments
               128W                          and services
                                             remain operational
OCT24–NOV13  - GOES-17 drift from 89.5 to   - HRIT/EMWIN
               137.1W                        disabled
NOV15        - GOES-17 HRIT/EMWIN
               activated
DEC10        - GOES-17 declared the
               Operational GOES-West
               satellite

The simultaneous operations of the EMWIN broadcast on
GOES-14(105W) and GOES-15(128W); and the HRIT/EMIWN broadcast on
GOES-16(75.2W) and GOES-17(137.1W) is scheduled to remain in
effect through May 2019.

The close proximity of broadcast frequencies and geosynchronous
orbits of the GOES-15 and GOES-17 satellites may cause EMWIN-15
users to experience interference from GOES-17. Users are
encouraged to make further adjustments in their antenna
orientation to reduce interference issues.

EMWIN virtual channels 20, 21 and 22 on the GOES-16 and 17
HRIT/EMWIN broadcasts will not be operational until 2019.
Users are reminded to use products on the GOES-14 and 15 EMWIN
satellite broadcasts for operations, and to refrain from using
products appearing on channels 20, 21 and 22 in the GOES-16
and 17 HRIT/EMWIN broadcast until declared operational by the NWS.

Questions or comments may be directed to:
NWS EMWIN Support at nws.emwin.support at noaa.gov

For NOAAPORT and NON-AWIPS Customers - if you have any
questions regarding distribution or would like to add these
products to your datastream please contact Data Management
at ncep.pmb.dm at noaa.gov.

This information is also posted on the NWS Data Management
change notices web page. The url is listed below.
http://www.nws.noaa.gov/datamgmt/notices.shtml

Data Management
NCO Production Management Branch College Park
GISC/RTH Washingto

-- 
Lloyd Colston KC5FM