NOXX20 KWBC 272150

ADMEMW

NATIONAL ADMINISTRATIVE MESSAGE FOR EMWIN

NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC

450 PM EDT FRI APR 27 2001

TO: EMERGENCY MANAGERS WEATHER INFORMATION NETWORK /EMWIN/

USERS

FROM: WALTER TELESETSKY

DIRECTOR...OFFICE OF OPERATIONAL SYSTEMS

NATIONAL WEATHER SERVICE /NWS/

AND

GARY DAVIS

DIRECTOR...OFFICE OF SATELLITE OPERATIONS

NATIONAL ENVIRONMENTAL SATELLITE...DATA... AND INFORMATION

SERVICE /NESDIS/

SUBJECT: EMWIN TRANSITION UPDATE 4/27/01

THE EMERGENCY MANAGERS WEATHER INFORMATION NETWORK /EMWIN/ HAS

MATURED INTO A VERY EFFECTIVE AND VALUABLE SERVICE FOR ITS USERS.

THROUGH EMWIN. THE NATIONAL WEATHER SERVICE /NWS/ PROVIDES VITAL

WARNINGS AND OTHER METEOROLOGICAL INFORMATION TO A BROAD SPECTRUM

OF USERS IN AN INEXPENSIVE MANNER.

EMWIN IS NOW BROADCAST FROM GOES /GEOSTATIONARY OPERATIONAL

ENVIRONMENTAL SATELLITE/ EAST AND WEST. THE FINAL SATELLITE OF

THE CURRENT SERIES /GOES M/ IS SCHEDULED TO BE LAUNCHED IN

JULY 2001. WE PLAN TO CONTINUE TO BROADCAST EMWIN IN ITS CURRENT FORM

AS LONG AS THE CURRENT SERIES OF SATELLITES IS OPERATIONAL.

CURRENTLY...GOES N IS SCHEDULED FOR LAUNCH IN FEBRUARY 2003 AND

TO BE STORED IN ORBIT. TRANSITION OF THE EMWIN BROADCAST TO

GOES N WILL NOT OCCUR UNTIL SOMETIME BETWEEN LATE 2003 AND 2005

/BARRING MULTIPLE CATASTROPHIC SATELLITE FAILURES/.

EMWIN CAN NOT BE BROADCAST IN ITS CURRENT FORM ON THE GOES SERIES

N THROUGH Q. MAJOR DIFFERENCES ARE:

- THE NEW SERIES OF SATELLITES WILL BROADCAST A DIGITAL SIGNAL

RATHER THAN THE CURRENT ANALOG

- THE EMWIN SIGNAL WILL USE A DEDICATED TRANSPONDER RATHER

THAN SHARE A CHANNEL AS IS CURRENTLY DONE...AND

- THE EMWIN SIGNAL WILL CONFORM TO INTERNATIONAL REGULATIONS

FOR POWER FLUX DENSITY RESULTING IN REDUCED EMWIN BROADCAST

POWER LEVELS

GOES N THROUGH Q WILL REQUIRE EMWIN TO USE DIFFERENT MODULATION

AND LINK CHARACTERISTICS. LATER THIS YEAR, THE GOES N THROUGH Q

BROADCAST WILL BE SIMULATED USING CURRENT SATELLITES TO PROVIDE

THE TECHNICAL INFORMATION NECESSARY FOR THE DESIGN OF NEW DIGITAL

EMWIN RECEIVER SYSTEMS.

THE NWS AND NESDIS ARE COMMITTED TO CONTINUE TO OPERATE AND

SUPPORT THE EMWIN PROGRAM. WE WILL INFORM THE USER COMMUNITY

WELL IN ADVANCE OF ANY CHANGE TO THE EMWIN SYSTEM AS WELL AS THE

TRANSITION TO A NEW SERIES OF SATELLITES. FUTURE EMWIN

TRANSITION UPDATES WILL BE DISTRIBUTED THROUGH EMWIN AND POSTED

AT /USE LOWER CASE/:

INDEX.HTM

PLEASE EMAIL CONCERNS YOU MAY HAVE REGARDING THE EMWIN TRANSITION

TO:

EMWIN.SYSTEM@NOAA.GOV

YOUR COMMENTS HELP US ASSESS THE IMPACT AND TIMING OF THE

TRANSITION.

AN EMWIN TRANSITION STUDY WILL BE COMPLETED IN EARLY JUNE 2001.

WE WILL SEND THE NEXT TRANSITION UPDATE MESSAGE SHORTLY AFTER THE

STUDY/S COMPLETION OR SOONER IF NEW SIGNIFICANT INFORMATION IS

AVAILABLE.

END

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