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-------- Original Message --------919 NOUS42 KWNO 291721
ADMNFD SENIOR DUTY METEOROLOGIST NWS ADMINISTRATIVE MESSAGE NWS NCEP CENTRAL OPERATIONS CAMP SPRINGS MD 120 PM EDT WED JUL 29 2009 THE NEW NOAA NWS NCEP SUPERCOMPUTERS...STRATUS/CIRRUS...ARE SCHEDULED TO BECOME OPERATIONAL IN AUGUST. NCEP/NCO WILL BE PERFORMING TESTS DURING THE NEXT SEVERAL WEEKS IN ORDER TO ENSURE THAT PRODUCT DELIVERY IS NOT IMPACTED ON THE IMPLEMENTATION DATE. NCEP/NCO IS PLANNING
TO DISSEMINATE PRODUCTS OPERATIONALLY FROM CIRRUS AND STRATUS ON THE DATES LISTED BELOW: CIRRUS - 12Z CYCLE TUE AUG 4TH...ONE CYCLE ONLY STRATUS - 12Z CYCLE MON AUG 10TH...ONE CYCLE ONLY IMPLEMENTATION DATE: 12Z CYCLE TUE AUG 18THAS WITH PREVIOUS UPGRADES...THE MODEL FORECASTS FROM THE NEW SYSTEMS MAY BE DISCONTINUOUS...ESPECIALLY AFTER DAY 5...FROM THE OLD SYSTEMS/PREVIOUS CYCLE. WHY? THE NDAS/GDAS SYSTEMS ARE INDEPENDENT ON THE TWO SYSTEMS WHICH MEANS THE TIMING OF DATA INGEST IS SLIGHTLY DIFFERENT WHICH MAY LEAD TO DIFFERENT INITIAL CONDITIONS ON THE NEW/OLD SYSTEMS. THE HARDWARE IS ALSO DIFFERENT AS THE NEW SYSTEMS ARE SIGNIFICANTLY FASTER. THIS MAY LEAD TO DIFFERENT ROUNDING/TRUNCATIONS SOLUTIONS.
EMC TESTS HAVE SHOWN THAT THERE IS NO APPRECIABLE DIFFERENCE IN SKILL SCORE BETWEEN THE SYSTEMS AS THE MODELING SYSTEMSHAVE NOT CHANGED.
WE APOLOGIZE FOR ANY INCONVENIENCES THIS MAY CAUSE. ALSO...THE SCHEDULE IS HIGHLY SUBJECT TO CHANGE IN THE EVENT OF A CRITICAL WEATHER DAY DURING THE TEST PERIOD. WE WILL
STRIVE TO INFORM USERS AS SOON AS POSSIBLE IN THE EVENT OF ANY SCHEDULE CHANGES. $$ SHRUELL/SDM/NCO/NCEP
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