The EMWIN Transition Plan – A Status Report

The EMWIN Transition Plan – The EMWIN Transition Plan – A Status Report A Status Report

IMPLEMENTATION - COORDINATION IMPLEMENTATION - COORDINATION MEETING ON THE GTS AND ISS IN RA V MEETING ON THE GTS AND ISS IN RA V

WELLINGTON, NEW ZEALANDWELLINGTON, NEW ZEALAND

8 - 12 DECEMBER 20038 - 12 DECEMBER 2003

Fred Branski

U.S. National Weather Service

Team Leader for Data Management

RTH Washington Focal Point

December 8, 2003December 8, 2003 22

What is EMWIN?What is EMWIN?

• The Emergency Managers Information The Emergency Managers Information Network is a wireless, priority-driven Network is a wireless, priority-driven computer weather data broadcast system.computer weather data broadcast system.

• EMWIN provides rapid dissemination of:EMWIN provides rapid dissemination of:– Warnings < 2 minutesWarnings < 2 minutes– Forecasts ~ 5 minutesForecasts ~ 5 minutes– Graphics ~ 10 – 15 minutesGraphics ~ 10 – 15 minutes– Imagery ~ 10 – 15 minutesImagery ~ 10 – 15 minutes– Other (as time permits)Other (as time permits)– In severe weather non-warning products may In severe weather non-warning products may

take longertake longer


Sample ForecastSample Forecast

• FPHW60 PHFO 201348FPHW60 PHFO 201348• SFPHI SFPHI

• STATE FORECAST FOR HAWAIISTATE FORECAST FOR HAWAII• NATIONAL WEATHER SERVICE HONOLULU HINATIONAL WEATHER SERVICE HONOLULU HI• 4 AM HST FRI JUN 20 20034 AM HST FRI JUN 20 2003

• HIZ001>003-005-006-210200-HIZ001>003-005-006-210200-• STATE FORECAST FOR THE ISLANDS OF KAUAI-OAHU-MAUI-MOLOKAI-LANAI-STATE FORECAST FOR THE ISLANDS OF KAUAI-OAHU-MAUI-MOLOKAI-LANAI-• 4 AM HST FRI JUN 20 20034 AM HST FRI JUN 20 2003

• ...HIGH SURF ADVISORY CANCELLED AT 4 AM......HIGH SURF ADVISORY CANCELLED AT 4 AM...

• .TODAY AND SATURDAY...MOSTLY CLEAR BUT FOR ISOLATED SHOWERS..TODAY AND SATURDAY...MOSTLY CLEAR BUT FOR ISOLATED SHOWERS.• HIGHS MID 80S. LOWS 70 TO 75. TRADE WINDS 15 TO 25 MPH.HIGHS MID 80S. LOWS 70 TO 75. TRADE WINDS 15 TO 25 MPH.

• .EXTENDED FORECAST....EXTENDED FORECAST...• .SUNDAY THROUGH TUESDAY...BECOMING PARTLY CLOUDY WITH SCATTERED .SUNDAY THROUGH TUESDAY...BECOMING PARTLY CLOUDY WITH SCATTERED • WINDWARD SHOWERS MONDAY AND TUESDAY. HIGHS 80 TO 85.WINDWARD SHOWERS MONDAY AND TUESDAY. HIGHS 80 TO 85.• LOWS 70 TO 75. TRADE WINDS 15 TO 25 MPH WEAKENING TO 10 TO 20LOWS 70 TO 75. TRADE WINDS 15 TO 25 MPH WEAKENING TO 10 TO 20• MPH MONDAY AND TUESDAY.MPH MONDAY AND TUESDAY.


Sample ImageSample Image


Sample GraphicSample Graphic


EMWIN – How it works EMWIN – How it works • Data are collected from a variety of sourcesData are collected from a variety of sources

– GatewayGateway– Weather WireWeather Wire– FTPFTP– InternetInternet

• They are assembled at the EMWIN servers and:They are assembled at the EMWIN servers and:– PrioritizedPrioritized– Split into packetsSplit into packets– Assembled into a data streamAssembled into a data stream

• The data stream is then sent to Wallops CDA (NESDIS) where it The data stream is then sent to Wallops CDA (NESDIS) where it is:is:– Up-linked to satellite (GOES 10 & 12)Up-linked to satellite (GOES 10 & 12)

• The data stream is then available to be received by user The data stream is then available to be received by user stationsstations– From here EMWIN products can be retransmitted by other methodsFrom here EMWIN products can be retransmitted by other methods

• Up-linked to another satellite (ex. PSAT)Up-linked to another satellite (ex. PSAT)• Transmitted via radio frequencyTransmitted via radio frequency• Sent on the Internet (BYTE Blaster)Sent on the Internet (BYTE Blaster)


EMWIN ArchitectureEMWIN Architecture


Methods of DisseminationMethods of Dissemination• Primary Wireless MethodsPrimary Wireless Methods

– GOES East and WestGOES East and West– PeaceSATPeaceSAT

• Secondary Wireless MethodsSecondary Wireless Methods– Commercial SatellitesCommercial Satellites– TV SAP channelTV SAP channel– TV Vertical Blanking Interval (VBI)TV Vertical Blanking Interval (VBI)– Radio Radio – PagersPagers

• InternetInternet


Why it works so wellWhy it works so well• The equipment is inexpensiveThe equipment is inexpensive

– An entire turnkey system costs as little as $1kAn entire turnkey system costs as little as $1k• System needs little to no infrastructureSystem needs little to no infrastructure

– Easy to run on a laptopEasy to run on a laptop– Ex. Solar powered version existsEx. Solar powered version exists

• Signal is “Weather Proof” due to L-Band transmissionSignal is “Weather Proof” due to L-Band transmission• Equipment is relatively compact and is very ruggedEquipment is relatively compact and is very rugged• The Data-stream is free, repeatable and can be customized The Data-stream is free, repeatable and can be customized

for local retransmissionfor local retransmission• EMWIN is non-proprietaryEMWIN is non-proprietary• Multiple inexpensive software display packages are Multiple inexpensive software display packages are

availableavailable• A large and knowledgeable user community to help monitor A large and knowledgeable user community to help monitor

performance and answer user questions (EMWIN user list)performance and answer user questions (EMWIN user list)• Transmission covers 3/4 of world surfaceTransmission covers 3/4 of world surface


GOES East and West GOES East and West footprintfootprint


EMWIN in the PacificEMWIN in the Pacific

• GOES West broadcastGOES West broadcast• PeaceSAT broadcastPeaceSAT broadcast

– Currently PeaceSAT rebroadcasts the entire EMWIN data-Currently PeaceSAT rebroadcasts the entire EMWIN data-streamstream

– Could be customized for the PacificCould be customized for the Pacific

• Provides advance warning of Tsunami and Provides advance warning of Tsunami and TyphoonsTyphoons

• Testimonials received have reported that after a Testimonials received have reported that after a severe event the only weather system still severe event the only weather system still functioning is EMWINfunctioning is EMWIN

• Many island nations already use EMWIN to save Many island nations already use EMWIN to save lives and propertylives and property


EMWIN current specsEMWIN current specs

• Frequency on GOES - 1690.725 MHzFrequency on GOES - 1690.725 MHz

• Modulation – Dual Frequency Shift Modulation – Dual Frequency Shift Keying (DFSK)Keying (DFSK)

• Speed - 9.6 kbpsSpeed - 9.6 kbps

• Power – EIRP = 51 dBmiPower – EIRP = 51 dBmi


Why is change necessary?Why is change necessary?• EMWIN shares spare bandwidth in the EMWIN shares spare bandwidth in the

existing WEFAX channelexisting WEFAX channel• The EMWIN/WEFAX broadcast was allowed to The EMWIN/WEFAX broadcast was allowed to

exceed UN ITU authorized power level by exceed UN ITU authorized power level by special exceptionspecial exception

• NESDIS GOES N/Q series will use all of former NESDIS GOES N/Q series will use all of former WEFAX channel bandwidth for new Low Rate WEFAX channel bandwidth for new Low Rate Information Transfer (LRIT) broadcastInformation Transfer (LRIT) broadcast

• Must move EMWIN to its own channel, at Must move EMWIN to its own channel, at reduced powerreduced power


What changes will be made?What changes will be made?

• Power level will be reduced to 44.5 dBmiPower level will be reduced to 44.5 dBmi

• New L band carrier frequency will be 1692.7 New L band carrier frequency will be 1692.7 MHzMHz

• Forward error correction will be addedForward error correction will be added

• Modulation scheme will be changed from Modulation scheme will be changed from DFSK to binary phase shift keying (BPSK)DFSK to binary phase shift keying (BPSK)


What the NWS has done so What the NWS has done so farfar• Upgrade of all EMWIN serversUpgrade of all EMWIN servers

– All programs now 32 bitAll programs now 32 bit– Network has been upgradedNetwork has been upgraded– All servers now fully redundantAll servers now fully redundant

• EMWIN GOES-N Transmission server createdEMWIN GOES-N Transmission server created– Transmission now 19.2 kbps (downlink 9.6)Transmission now 19.2 kbps (downlink 9.6)– It’s been under test since May 1, 2003It’s been under test since May 1, 2003

– No problems have been encounteredNo problems have been encountered• Communication lines to NESDIS installedCommunication lines to NESDIS installed

– Lines have been tested operationally using the current Lines have been tested operationally using the current systemsystem

– Installed new modems and they are in use operationallyInstalled new modems and they are in use operationally• Installed a downlink system to monitor EMWIN Installed a downlink system to monitor EMWIN

GOES-N broadcast when availableGOES-N broadcast when available


Space segment restrictionsSpace segment restrictions

• Original plan to use GOES-8Original plan to use GOES-8

• GOES-8 now diverted to back up GOES-9GOES-8 now diverted to back up GOES-9

• Present view:Present view:– GOES-8 & 9 available for manufacturer GOES-8 & 9 available for manufacturer

testingtesting– Use GOES-11 during its annual test cycle Use GOES-11 during its annual test cycle

For west coast of US and Pacific areaFor west coast of US and Pacific area


EMWIN transition planning EMWIN transition planning • NWS/NESDIS joint effort NWS/NESDIS joint effort • Revised transition plan in preparation, to includeRevised transition plan in preparation, to include

– Technical specificationsTechnical specifications– SchedulesSchedules– Transition stepsTransition steps

• Prototype software demodulator and receiver is being Prototype software demodulator and receiver is being developed by NESDIS developed by NESDIS – Will be capable of operating in both present and Will be capable of operating in both present and

future EMWIN operational modes with keystroke future EMWIN operational modes with keystroke switchingswitching

– Development contract awarded on June 23, 2003 Development contract awarded on June 23, 2003 with delivery expected in November, 2003with delivery expected in November, 2003•System currently under testSystem currently under test


Prospective timetableProspective timetable

• 20032003– Sept – Prototype user Sept – Prototype user

workstation available, workstation available, – Dec – Complete user Dec – Complete user

workstation testing & workstation testing & documentationdocumentation

• 2004 2004 – Jan - Issue final technical Jan - Issue final technical

specifications to specifications to manufacturers and usersmanufacturers and users

– Mar – Integrate & test Mar – Integrate & test EMWIN-N uplink EMWIN-N uplink equipmentequipment

• 2004 cont’d 2004 cont’d – Apr to July – Manufacturers & Apr to July – Manufacturers &

users test new workstation users test new workstation using GOES-8 or GOES-9using GOES-8 or GOES-9

– June – GOES N available for June – GOES N available for public testingpublic testing

– Sep to Jan 2005 – Sep to Jan 2005 – Deployment of new Deployment of new workstationsworkstations

• 2005 2005 – Transition GOES-West to the Transition GOES-West to the

EMWIN-NEMWIN-N– Transition GOES-East to the Transition GOES-East to the

EMWIN-NEMWIN-N

The EMWIN Transition Plan – A Status Report

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