HydroHydro--NEXRAD: Community ResourceNEXRAD: Community ResourceHydroHydro--NEXRAD: Community Resource NEXRAD: Community Resource for Use of Radarfor Use of Radar--Rainfall DataRainfall Data

Presented byPresented byWit ldWit ld FF K j kiK j kiWitoldWitold F. F. KrajewskiKrajewski

A Kruger J A Smith R Lawrence RA Kruger J A Smith R Lawrence R GoskaGoska PP DomaszczynskiDomaszczynskiA. Kruger, J.A. Smith, R. Lawrence, R. A. Kruger, J.A. Smith, R. Lawrence, R. GoskaGoska, P. , P. DomaszczynskiDomaszczynski, , C. C. GunyonGunyon, B.C. , B.C. SeoSeo, M.L. , M.L. BaeckBaeck, A.A. Bradley, M.K. Ramamurthy, , A.A. Bradley, M.K. Ramamurthy,

W.J. Weber, S.A. W.J. Weber, S.A. DelgrecoDelgreco, B. Nelson, S. , B. Nelson, S. AnsariAnsari, M. Murthy, , M. Murthy, DD Dh tiDh ti M St i A AM St i A A Nt l kNt l k GG Vill i iVill i iD. D. DhutiaDhutia, M. Steiner, A.A. , M. Steiner, A.A. NtelekosNtelekos, G. , G. VillariniVillarini

What is HydroWhat is Hydro--NEXRAD?NEXRAD?A WebA Web--based based prototypeprototype application that allows application that allows ordering customized radarordering customized radar--rainfall maps (products)rainfall maps (products)ordering customized radarordering customized radar--rainfall maps (products) rainfall maps (products) for hydrologic studies based on NEXRAD data.for hydrologic studies based on NEXRAD data.

Why?Why?Why?Why?…to provide the hydrologic community with ready …to provide the hydrologic community with ready

t th t hi d lt th t hi d l titiaccess to the vast archives and realaccess to the vast archives and real--time time information on precipitation collected by the information on precipitation collected by the national network of WSRnational network of WSR 88D weather radars88D weather radarsnational network of WSRnational network of WSR--88D weather radars.88D weather radars.

HydroHydro--NEXRAD NSF ITR ProjectNEXRAD NSF ITR Project

•• The University of Iowa (Lead)The University of Iowa (Lead)–– Conceptual design, database development andConceptual design, database development andConceptual design, database development and Conceptual design, database development and

maintenance, metadata calculation, algorithms, software maintenance, metadata calculation, algorithms, software engineering, Graphical User Interface, user supportengineering, Graphical User Interface, user support

•• Princeton UniversityPrinceton University–– Conceptual design, algorithms, comprehensive testingConceptual design, algorithms, comprehensive testing

•• National Climatic Data CenterNational Climatic Data Center–– Archival data, future implementation of the systemArchival data, future implementation of the system, p y, p y

•• UCAR/UCAR/UnidataUnidata Program CenterProgram Center–– RealReal--time data provider, hydrologic product distribution,time data provider, hydrologic product distribution,RealReal time data provider, hydrologic product distribution, time data provider, hydrologic product distribution,

map server maintenancemap server maintenance

HydroHydro--NEXRAD’s Main FeaturesNEXRAD’s Main Features

●● Basin centric (USGS HUC2 through HUC8)Basin centric (USGS HUC2 through HUC8)●● Physically meaningful metadata for basins, Physically meaningful metadata for basins,

radars, and rain gauge locationsradars, and rain gauge locations●● Choice of grid resolution and projectionChoice of grid resolution and projection●● Choice of products (space and time scales)Choice of products (space and time scales)●● UserUser--selected algorithms (include multiple radar selected algorithms (include multiple radar

data merging)data merging)●● Modular designModular design●● MapMap-- and calendarand calendar--based Graphical User Interfacebased Graphical User Interface●● And much more…And much more…

Research AppealResearch Appeal

●●Basin centricBasin centric●●Basin centricBasin centric●●Radar expertise not requiredRadar expertise not required●●Hi hl t i bl d tHi hl t i bl d t●●Highly customizable productsHighly customizable products●●RepeatabilityRepeatability●●High performance (1 year in ~1 day)High performance (1 year in ~1 day)●●Ease of useEase of use●●Easily expandableEasily expandable●●Much more…Much more…

Let’s transition to live demonstration…Let’s transition to live demonstration…

…back from live demonstration……back from live demonstration…

…after receiving e…after receiving e--mail mail notification ftp thenotification ftp thenotification ftp the notification ftp the products and open them products and open them in Arc View GISin Arc View GISin Arc View GIS…in Arc View GIS…

Where Are We Now?Where Are We Now?

●● Collecting, processing & archiving Level II data from ~40 radarsCollecting, processing & archiving Level II data from ~40 radars●● Database completeness estimated as 70%Database completeness estimated as 70%●● Supporting ~50 Supporting ~50 ββ--users users ●● Working with NCDC to transfer the missing dataWorking with NCDC to transfer the missing data●● Working with NCDC to transfer the missing dataWorking with NCDC to transfer the missing data●● Working with NCDC to implement HydroWorking with NCDC to implement Hydro--NEXRAD metadata NEXRAD metadata

calculations calculations at the NCDCat the NCDC●● Developed a prototype realDeveloped a prototype real time version (tested at the Clear Creektime version (tested at the Clear Creek●● Developed a prototype realDeveloped a prototype real--time version (tested at the Clear Creek time version (tested at the Clear Creek

and Susquehanna WATERS observatories)and Susquehanna WATERS observatories)●● Working with Working with UnidataUnidata to add realto add real--time products to LDMtime products to LDM--based based

di t ib tidi t ib tidistributiondistribution●● Conducting largeConducting large--scale tests and evaluation experimentsscale tests and evaluation experiments●● Debugging, enhancing, testing, checking, …, debugging, enhancing, Debugging, enhancing, testing, checking, …, debugging, enhancing,

testing, …testing, …

Limitations (some …)Limitations (some …)

●● Limited spatial coverageLimited spatial coverage●● Limited temporal coverageLimited temporal coverage●● RadarRadar--only products (no merging with rain gauge data)only products (no merging with rain gauge data)●● InterInter--radar calibration differencesradar calibration differences●● No true NWS PPSNo true NWS PPS●● No snowfall algorithmNo snowfall algorithm●● No support for the upcoming “super resolution”No support for the upcoming “super resolution”●● N t l tiN t l ti●● No true real timeNo true real time●● No quantification of uncertaintyNo quantification of uncertainty

When It Is All Done…When It Is All Done…

●●30 radars 30 radars ×× 5+ years of Level II data5+ years of Level II data●●10 radars with full (10+ yrs) record10 radars with full (10+ yrs) record●●Complete metadata databaseComplete metadata databaseComplete metadata databaseComplete metadata database●●Opening the system to the community Opening the system to the community

(this summer)(this summer)( )( )●●Facing the question “What’s next?”Facing the question “What’s next?”

9,156,044 files, 20.1TB, 56 users, 8,029,698 rows of metadata 128 36 radar years of metadata 8 crawlers 41metadata, 128.36 radar-years of metadata, 8 crawlers, 41 executables, 27 scripts, 1,000+ HUCs,…, and growing

The Issue: What’s next?The Issue: What’s next?

●●Three modes of use:Three modes of use:•• Iowa Archives (efficient Iowa Archives (efficient

but limited coverage)but limited coverage)••

NSF project, ending soonNSF project, ending soon

Will take years to match Will take years to match •• NCDC Archives (complete NCDC Archives (complete but slow)but slow)•• Real timeReal time

yyHydroHydro--NEXRAD’s NEXRAD’s functionalityfunctionality

NeedsNeeds UnidataUnidataReal timeReal time Needs Needs UnidataUnidata

ffAll need hardware and software enhancements and All need hardware and software enhancements and maintenancemaintenance

Send inquiries to:Send inquiries to:qq

witoldwitold--krajewski@uiowa.edukrajewski@uiowa.edu

Thank You!Thank You!

witoldwitold krajewski@uiowa.edukrajewski@uiowa.edu

Thank You!Thank You!

The EndThe End