A Few Issues Regarding the Use of Q2 (and related) products and software at NCEP/EMC Curtis H. Marshall NCEP/EMC Q2 Science Workshop NSSL Norman, OK June 28-30 2005

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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
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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) -gt
  influence on surface energy budget and subsequent
  convective precipitation

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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

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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

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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?

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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!

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FEEDBACK?Thanks!