National Weather Service United States Department of Commerce

A Number Of Hazards Expected Today

A number of hazards are expected across the U.S. today. Severe thunderstorms are expected in the Upper Mississippi Valley and from Missouri to the Carolinas. Widespread critical fire weather conditions are likely from the Southwest to south-central High Plains. Flood watches are in effect for parts of Hawaii and Alaska. Finally, record heat persists in the Southern U.S. Read More >

Why EMWIN is Transitioning

NESDIS is preparing to replace a GOES-N series satellite with a GOES-R series satellite.

  • GOES-R (GOES 16) launched November 19, 2016 and will be operational in 2017.
  • GOES-R HRIT/EMWIN transponder will replace the GOES-N EMWIN transponder.

NWS is consolidating the management of dissemination services, under a program called the Integrated Dissemination Program (IDP)

  • Objective: sustainable, consolidated enterprise architecture; reduced costs
  • Operations centers located in:
    • ‚ÄčCollege Park, MD
    • Boulder, CO

IT Security threats require NOAA to periodically updating controls and procedures to minimize the risk of potential EMWIN operational impacts.


Transitioning HRIT/EMWIN from GOES-N to GOES-R (NESDIS-1)

Improved data products for hemispheric re-transmission

  • Faster full disk images: between 15 and 30 minutes
  • Warnings, Watches, Tropical Storm Information
  • Copy of GOES Data Collection System (GOES DCS)

Requires new antenna and receiver hardware

  • Receiver frequency shift to 1694.1 MHz from:
    • EMWIN 1692.7 MHz and LRIT 1691.0
  • BPSK Modulation; EMWIN shift from Offset QPSK
  • Data Rate to a combined 400 Kilobits per Second from: EMWIN: 19.2 Kbps and LRIT : 128 Kbps (combined 147.2)

Documents and updates to be posted on the GOES-R web site:

NOTES: GOES-R: HRIT = High Rate Information Transmission ~ 400 kbps (combined transmission rate)
               GOES-N: LRIT = Low Rate Information Transmission ~ 128 kbps


Transition from LRIT and EMWIN to HRIT/EMWIN


On GOES –N Series
On GOES-R Series
Full Disk, NH, SH images 3 Hourly Full Disk; .5 hour
NH/SH; follows GOES
East/West Schedule. RSO issue
Variable but planned 3
Channels of Full Disk every
15 minutes
Modulation LRIT BPSK
Receiver Center Frequency LRIT 1691.0 MHz (L-Band)
EMWIN 1692.7 MHz (L-Band)
1694.1 MHz (L-Band)
Data Rate LRIT 128 Kbps
EMWIN 19.2 Kbps
400 Kbps
Antenna Coverage Earth Coverage to 50
Earth Coverage to 50
Imagery Data Sources GOES-N Imager (IR,VIS,WV)
MTSAT Imager
ABI (3 or more bands)
HBI (3 bands hourly-GOES W
EMWIN Products Full Suite of Current Products
Combined w/ LRIT Products
GOES DCS Copy of DCS observations
Copy of observations