National Weather Service United States Department of Commerce

Severe Thunderstorms in the Southern and Central Plains; Flooding Threat in Western Hawaii

Isolated to scattered severe thunderstorms may produce large hail, severe wind gusts, and heavy rain and isolated flash flooding across portions of the southern and central Plains. Showers and thunderstorms are expected to linger cross the South the next couple of days. Heavy showers are creating a flash flooding threat around Kauai and Niihau, Hawaii. Read More >

Emergency Managers Weather Information Network

National Program

Weather.gov > Emergency Managers Weather Information Network
Topic Description
General Description

EMWIN disseminates alerts, watches, warnings, observations, forecasts and climate products in text and image formats (see EMWIN Catalogs) via:

  1. Satellite broadcast:

    • GOES-19 (East), GOES-18 (West) High Rate Information Transmission (HRIT) broadcast.
    • Freq/channels: 1694.1-MHz / 20,21,22

  2. EMWIN FTP File Server:

    • Accessible on the public Internet.

      Systems Status information is manually updated M-F during Eastern Time business hours 8am-4pm.
Hardware

  1. Satellite broadcast reception:

    • HRIT Reception reception characteristics (NESDIS)
    • Commercial HRIT satellite terminal
      Manufacturers list (NESDIS)
    • Fabricated HRIT satellite terminals built with components and parts available on the open market. (Internet search "build goes-r receiver" for additional publishedinformation).

  2. EMWIN FTP File Server:

    PC/workstation/mobile device with public Internet access
Software

  1. Satellite broadcast:

    • Commercial HRIT satellite terminals are generally equipped with all the required software. Consult vendor for additional information.
    • Fabricated HRIT satellite terminals will require users to identify and acquire the necessary software. Information is available by searching the public Internet.Government information on "demonstration software" developed for HRIT/EMWIN is available here: https://www.goes-r.gov/users/hrit-links.html

  2. EMWIN FTP File Server:

    Web browsers, commercial applications or scripting software programs (e.g., Perl) may be used to access and download products.
Format(s)

  1. Text Products are presented in WMO Bulletin format

    US products may include AWIPS Identifiers containing a descriptive product category code (see: AWIPS Category Codes (NNN)).

  2. Image Products are broadcast in their native file format with telltale file extensions:

    • JPG - Joint Photographic Experts Group (JPEG) format
    • PNG - Portable Network Graphics
    • GIF - Graphics Interchange Format

    Note: Products larger than 5 kilo-bytes in size are compressed into a .zip formatted file prior to broadcast and must be uncompressed to return the file to its original file format.
Monitoring
  1. The EMWIN product stream creation and EMWIN FTP archive file server operations are monitored by NOAA Central Operations (NCO), NWS, 24x7.
  2. EMWIN satellite uplink and satellite broadcast services are monitor by NESDIS 24x7.
  3. EMWIN image product accountability is monitored by the Dissemination Systems Branch, NWS, daily.
Access Information

EMWIN broadcast services are open and available to the public 24x7:

  1. EMWIN GOES-East/West satellite broadcast footprint: see NESDIS HRIT Broadcast
  2. EMWIN GOES-East/West satellite broadcast reception: see NESDIS HRIT Reception

  3. EMWIN FTP File Server on the public Internet - URL:

    https://tgftp.nws.noaa.gov/SL.us008001/CU.EMWIN/DF.xt/DC.gsatR/OPS/
Documents

  1. HRIT/EMWIN Service Overview:

  2. Products on EMWIN broadcast services:

  3. Service description:
Alert Information

EMWIN disseminates national and international weather and water alerts and warnings, and US non-weather emergency message alerts. Refer to the EMWIN_Text_Product Catalog for a listing of product category codes (ref: US AWIPS Category Codes (NNN)) and WMO product header included on the broadcast.
Special Needs

Users may interface their EMWIN receiving systems with separate commercial or user-developed applications and devices to address their specific special needs.
Issues
  1. The status of EMWIN broadcast services is updated manually during normal business hours on the Home Page.

  2. EMWIN service issues impacting user operations should be reported immediately to:

    Tech Control:

    Phone:
    301-683-1518
    or
    Email:
    SDM@noaa.gov
    and cc:
    nws.emwin.support@noaa.gov
  3. Questions regarding the broadcast products, adding or replacing broadcast products or broadcast product format should be addressed to: nws.emwin.support@noaa.gov
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