1 / 9

CBRFC Issues 1st Q2 workshop 28-30 June 2005

CBRFC Issues 1st Q2 workshop 28-30 June 2005. Craig Peterson Greg Smith Colorado Basin RFC Salt Lake City, Utah. Precipitation quality control. Colorado, Wyoming, Central/Nrn Utah daily_qc 6/24 hour Gage only Quality control temperature and freezing level

Download Presentation

CBRFC Issues 1st Q2 workshop 28-30 June 2005

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. CBRFC Issues1st Q2 workshop 28-30 June 2005 Craig Peterson Greg Smith Colorado Basin RFC Salt Lake City, Utah

  2. Precipitation quality control • Colorado, Wyoming, Central/Nrn Utah • daily_qc • 6/24 hour • Gage only • Quality control temperature and freezing level • Outputs include points, grids and MAPs • Arizona, New Mexico, Southern Utah • MPE • “Front ended” by daily_qc • 1 hour • Mixture of gage and radar • Satellite estimates can be used in data void areas • Outputs include points and grids

  3. Operational use of MPE • Seasonal variation • Winter primarily gage only • Summer mixture of gage and radar

  4. CBRFC Operational Issues • Hourly gages often “front ended” by daily_qc • Has various tools to help QC gage data • Defining usable NEXRAD area • Defines NEXRAD mask so that areas under radar umbrella with low confidence are “blocked” out • Helps greatly in calculating the bias adjustment

  5. Defining usable NEXRAD area-Current method Statically define radar coverage field Hybrid scan, Occultation Elevation assumption Use if mid point elevation of beam: Summer < 20000 ft Winter (liquid events only!) < 6000 ft north of 37N < 12000 ft south of 37N Maximum 30 percent blockage Agrees well with radar climatology (summer)

  6. Defining usable NEXRAD-Future Requirements • Dynamically define radar coverage field • Hybrid scan, Occutlation • Freezing/melt level (hourly) • Only use liquid events • Elevation assumption • Specific to event? • Define hourly

  7. Other CBRFC Issues • Satellite estimates have been used in data void areas • Short term QPF needed for 1 hourly segments especially for convective events in smaller basins • Bias adjustments • Consistent Z-R relationships

More Related