016
NOXX20 KWBC 272117
ADMEMW
NATIONAL ADMINISTRATIVE MESSAGE FOR EMWIN
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
515 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/:
HTTP://IWIN.NWS.NOAA.GOV/EMWIN/INDEX.HTM
PLEASE EMAIL CONCERNS YOU MAY HAVE REGARDING THE EMWIN TRANSITION
TO:
EMWIN.SYSTEM@xxxxxxxx
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
NNNN
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