20060929: ASOS wind sensor delay-Fwd: ADMIN NOTICE NOUS41 KWBC]

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-------- Original Message --------

742 NOUS41 KWBC 291225
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 02-30A NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 830 AM EDT FRI SEP 29 2006
TO:       FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER 
         WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY MANAGERS 
         WEATHER INFORMATION NETWORK /EMWIN/ SUBSCRIBERS... 
         OTHER NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS OF
         AVIATION DATA AND FORECASTS...NWS EMPLOYEES 

FROM:     MIKE CAMPBELL 
         CHIEF...OBSERVING SERVICES DIVISION 

SUBJECT:  AUTOMATED SURFACE OBSERVING SYSTEM WIND SENSOR           
         REPLACEMENT HAS BEEN DELAYED. 

...THE INSTALLATION OF THE WIND SENSOR HAS BEEN DELAYED 
INDEFINITELY...
THE FOLLOWING CHANGES HAVE NO DIRECT IMPACT ON NOAA WEATHER WIRE  
SERVICE SUBSCRIBERS THE AUTOMATED SURFACE OBSERVING SYSTEM /ASOS/ 
PRODUCT IMPROVEMENT PROGRAM WILL SOON DEPLOY A REPLACEMENT WIND 
SENSOR. THE NEW SENSOR WILL REPORT WIND INFORMATION USING THE 
3-SECOND WORLD METEOROLOGICAL ORGANIZATION /WMO/ GUST STANDARD. THE 
CURRENT ASOS WIND SENSOR /BELFORT 2000 / USES ROTATING CUPS TO 
MEASURE WIND SPEED AND A VANE TO MEASURE WIND DIRECTION. OVER A 
2-MINUTE PERIOD...ASOS USES TWENTY-FOUR 5-SECOND AVERAGES TO 
DETERMINE THE 2-MINUTE AVERAGE WIND SPEED AND DIRECTION. EVERY 
MINUTE ASOS STORES THE HIGHEST 5-SECOND AVERAGE SPEED FOR THE PAST 
MINUTE... ALONG WITH ITS DIRECTION... IN THE 12-HOUR ARCHIVE FOR 
ADDITIONAL PROCESSING. THIS HIGHEST SPEED VALUE IS USED TO DETERMINE 
IF A GUST AND/OR A PEAK WIND REMARK WILL BE REPORTED. THE NEW ASOS 
WIND SENSOR /VAISALA 425NWS / IS A SONIC ANEMOMETER. IT HAS NO 
MOVING PARTS AND WILL OPERATE BETTER IN WINTER WEATHER CONDITIONS. 
AS WITH THE BELFORT SENSOR...OVER A 2-MINUTE PERIOD...ASOS USES 
TWENTY-FOUR 5-SECOND AVERAGES TO DETERMINE THE 2-MINUTE AVERAGE WIND 
SPEED AND DIRECTION. BUT THE HIGHEST 3-SECOND RUNNING AVERAGE SPEED 
IS STORED FOR GUST AND PEAK WIND PROCESSING. WHILE THERE WILL BE 
LITTLE DIFFERENCE IN 2-MINUTE AVERAGE WIND SPEED AND DIRECTION 
REPORTING...THE CHANGES IN GUST AND PEAK WIND REPORTING MAY BE 
SIGNIFICANT. WE CAN EXPECT TO SEE MORE GUSTS AND PEAK WINDS REPORTED 
WITH THE NEW SENSOR. THE MASS OF THE MOVING PARTS IN EXISTING 
SENSORS LIMITS RESPONSIVENESS. THE NEW SENSOR WILL BE MORE 
RESPONSIVE TO SHORT TERM GUSTS. 

THE FOLLOWING ASOS LOCATIONS HAVE OR WILL TRANSITION TO THE IFW 
CONFIGURATION ON THE INDICATED DATES: 

HTL HOUGHTON LAKE ASOS SEPTEMBER 29, 2006 (DELAYED INDEFINITELY)

IF YOU HAVE ANY QUESTIONS ABOUT THIS CHANGE...PLEASE CONTACT ONE OF THE FOLLOWING INDIVIDUALS AT NWS HEADQUARTERS: JAMES HEIL SURFACE OBSERVATIONS FOCAL POINT PHONE: 301-713-1792 X140 E-MAIL: JAMES.HEIL@xxxxxxxx OR RICHARD AHLBERG ASOS PLANNED PRODUCT IMPROVEMENT PROGRAM MANAGER PHONE: 301-713-1975 X160 E-MAIL: RICHARD.AHLBERG@xxxxxxxx. THIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE ON THE INTERNET AT /USE LOWER CASE/: HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM END $$ NNNN


begin:vcard
fn:Linda  Miller
n:Miller;Linda 
org:;UCAR/Unidata
adr;dom:;;P.O. Box 3000;Boulder,;CO;80307-3000
email;internet:lmiller@xxxxxxxxxxxxxxxx
title:Community Services
tel;work:303-497-8646
version:2.1
end:vcard

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