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Addressing Challenges in Q2 Product and Software Usage at NCEP/EMC: Insights from 2005 Workshop

This document summarizes key issues discussed at the NCEP/EMC Q2 Science Workshop in June 2005, focusing on precipitation assimilation challenges. Currently, NCEP/EMC employs Stage II/IV for NDAS precipitation assimilation, adjusting model parameters to match observed precipitation. The workshop initiated plans to improve cloud and hydrometeor assimilation, necessitating high-quality WSR-88D reflectivity data. Key points include operational requirements for support, a verification process against existing systems, and the potential distribution of new mosaic products post-implementation.

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Addressing Challenges in Q2 Product and Software Usage at NCEP/EMC: Insights from 2005 Workshop

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  1. A Few Issues Regarding the Use of Q2 (and related) products and software at NCEP/EMCCurtis H. MarshallNCEP/EMCQ2 Science WorkshopNSSLNorman, OKJune 28-30 2005

  2. Background • Currently: NCEP/EMC uses Stage II/IV for precipitation assimilation in NDAS • model is nudged to observed precipitation during assimilation cycle • model temperature, moisture, and cloud fields are adjusted to be more consistent with observed precipitation • also: land-surface model receives the observed precipitation (in lieu of model precipitation) -> influence on surface energy budget and subsequent convective precipitation

  3. Background • Current work: towards “assimilation” of cloud and hydrometeors • first step: using Z-R and Z-M relationships, develop forward model and nudge model hydrometeor concentrations • adjust model temperature, moisture, and momentum fields to be consistent with “observed” hydrometeors • PRELIMINARY target: WRF-NMM implementation in March 2006

  4. The Plan • Required data: gridded, quality-controlled WSR-88D reflectivity data • Level-II data stream now flowing through LDM/TOC into NCO • Adapt NSSL single radar QC code at NCEP (currently underway) • Use NSSL reflectivity Mosaic code to construct national realtime mosaic operationally at NCEP • Nudge towards the 3-D analysis of reflectivity in WRF-NMM data assimilation cycle

  5. Potentially…. • Distribution of reflectivity mosaic to service centers and other customers? • Hosting an operational version of NMQ on NCEP computing platform? • Production and distribution of other NMQ (e.g., QPE) products?

  6. … Some Issues • The requirement must be defined for NCEP • Need assurances of operational support (who to call 24/7 if something goes awry?) • Would like to see a side-by-side long-term (annual cycle?) verification of NMQ QPE against Stage II/IV • NCEP NOT in a position to provide end user support to potential customers of NMQ products!

  7. FEEDBACK?Thanks!

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