1. USWRP Analysis or Record Summit Breakout Session 1: Analysis Requirements Facilitation by David Ruth and John Snook June 30, 2004

2. USWRP Analysis of Record Summit June 2004 Our Charge Identify and prioritize requirements for AORsIdentify and prioritize requirements for AORs –What is absolutely essential at the outset? –What are the fundamental characteristics to be met in future?

3. USWRP Analysis of Record Summit June 2004 Absolute Essentials at outset (Target - Dec 04) Resolution and domainResolution and domain –at least 2.5km spatial resolution –at least 1 hour temporal resolution –NDFD grid with some extension (e.g., river basins in Canada) ContentContent –At least all official NDFD elements as defined by NWS directive 10-506 –Unqualified certainty (i.e., non-probabilistic)

4. USWRP Analysis of Record Summit June 2004 Absolute Essentials at outset TimelinessTimeliness –Analysis of Moment (AOM) available by 15 minutes past hour –Analysis of Record (AOR) available within 24 hours Availability (both AOM and AOR)Availability (both AOM and AOR) –To NCEP Service Centers, RFCs, and WFOs –To customers and partners along with NDFD ConsistencyConsistency –Both AOM and AOR need to be seamless over NDFD domain in time and space –Stable error characteristics pending periodic retrospective reanalyses

5. USWRP Analysis of Record Summit June 2004 Fundamental Characteristics for Future Retrospective runs at least to 1971Retrospective runs at least to 1971 Quantify uncertainty of analysis using PDFQuantify uncertainty of analysis using PDF –Addresses average versus extremes issue Elements in addition to NDFD (e.g., SLP)Elements in addition to NDFD (e.g., SLP) NDFD elements above surfaceNDFD elements above surface Subhourly timescale on at least a 1km gridSubhourly timescale on at least a 1km grid