1 nexrad data and products at ncdc national climatic data center brian nelson john bates steve...
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NEXRAD Data and Products at NCDC
National Climatic Data CenterBrian NelsonJohn Bates
Steve AnsariStephen Del Greco
NOAA/NESDIS
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Outline
• Brief Overview of NEXRAD
• Data at NCDC
• Products at NCDC
• Applications (software)
• Product development
• GEWEX connection
• Working Group on Precipitation Radar Networks
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NEXRAD Overview
Weather Surveillance Radar – 1988 Doppler– Next Generation Radar– Development started in 1960s– Deployment started in 1988 – First WSR-88D Site in 1990 Norman Ok– Last Site in 1997 in Indiana– Most Sites have been operational since 1995/1996–~$5 million/ site– ~500 GB/radar/year
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NEXRAD Overview
• 155 Sites (145 CONUS)
• Puerto Rico, Guam, Hawaii, Alaska, etc.
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NEXRAD Data
Level II• Reflectivity• Spectral Width• Notch Velocity
Level III• 20 + Products• Reflectivities• Radial Velocities• Wind Profile• Vertical Integrated Liquid• Surface Rainfall• Precipitation
Volume Scans• 1o x 1km• 5-6 minutes rainfall mode
Derived Products• Polar and Rectangular Gridded• From 5,6 minute to Hourly and Storm Event
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Entire NEXRAD Period of Record:• 1991 – Present• 1.5 Petabytes – 334,652 DVDs• Increases at 480 Gigabytes/Day• Potential increase to 6,656 Gigabytes/Day
NEXRAD Level II4,786 Requests 658 Unique UsersTotal Volume serviced – 39.9TBAnnual Volume Ingested – 72TB
NEXRAD Level III2,421 Requests 378 Unique UsersTotal Volume serviced – 1.4TBAnnual Volume Ingested – 2TB
WSR-88D Radar Data Services NCDC Radar Archives:
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Precipitation Products
Name Span Time Space How to get
NEXRAD Level II
1995 – present 5min 1deg x 1km Online order
NEXRAD Level III
1995 – present 5min to Hourly 1deg x 1km – 4km nominal
Online order
MPR 1996 – present Hourly 4km HRAP THREDDS
Q2 – QPE-SUMS
2005 – present 5 minute 1 deg x 1 km Online order
GPCP 1979 - present Monthly, Daily 1 deg – 2.5 deg
ftp
DSI 3200 1900 – present Daily In-situ Online order
DSI 3240 1970 – present Hourly In-situ Online order
CRN 2000 – present Hourly In –situ Online order
HADS 1996 – present Hourly In-situ Online order
Model Data Varies Varies Varies THREDDS -NOMADS
Precipitation products available at NCDC
Radar-Based
In-Situ
Model
Satellite-Based
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Direct access to NEXRAD Digital Data, Data Visualization, Analysis and Export Tools via the NCDC radar resources web pageURL: http://www.ncdc.noaa.gov/oa/radar/radarresources.html
Spatial Search
Temporal Search
File Search
Order Data
WSR-88D Radar Data Services Services include:
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Software Applications
Java NEXRAD Viewerhttp://www.ncdc.noaa.gov/oa/radar/radarresources.html
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Software ApplicationsJava NEXRAD Viewer
• Filter NEXRAD Export Data
•Export NEXRAD to shapefiles, ESRI Grids, GrADS (coming soon: NetCDF, GeoTIFF & HDF)
•Export Simple Math Results
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R&D
High-Resolution Microwave-Based Precipitation Analysis
Quarter degree spatial, daily temporal analysis (Tom Smith, Ralph Ferraro, Yin, and others)
Microwave-based precipitationAMSU, SSMI, AMSR-E, TRMM satellites, and gauge
dataMay augment with IR data to fill gaps
Latest MW algorithms for consistencyDeveloped an OI of MW and gauge observations
Estimation of error and scale OI statisticsBias-adjustment method may be applied to product
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NOAA Multi-sensor QPE – Vision
Rain Gauge Data
Satellite Data
Radar Data
NWP Model Output Data
Lightning Data
External Partners
NWS
NCDC
NESDIS/ORA
OAR/NSSL
Other OAR Labs
NOAA Multisensor QPE
Products & Services
Real-Time Multisensor
QPE
Multisensor Precipitation
Reanalysis (MPR)
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WSR-88D Level II Data
Rain Gauge Data
Satellite Data
NWP Model Output
Lightning Data
National Reflectivity
Mosaic
National Multisensor
QPE
Complete Rain Gauge Data
Additional Satellite Data
Additional NWP Model
Output National Multisensor Precipitation Reanalysis
Reanalysis Products
Real-Time Products
Customers
NMQREAL-TIME ANALYSIS
Customers
NCDC Archive*
CR
AF
T
* Level II and Level III
Multi-Sensor Precipitation REANALYSIS
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Why precipitation?Critical climate variable through water cycleCritical weather and water variable
Why multisensor?Improves accuracy, resolution, coverage
Why reanalysis?Affords more complete and better quality-controlled input data, and “best” scientific algorithms availableCan provide consistent high-resolution high-quality products
Why now?High-resolution high-quality precipitation data (both historical and real-time) critically needed for water management … among others.A decade of operational experience with real-time multisensor quantitative precipitation estimation (QPE)Experience with limited-scope/scale multisensor precipitation reanalysisNational Mosaic and Quantitative Precipitation Estimation (NMQ) Project
Multi-Sensor Precipitation REANALYSIS
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Applications
Drought
Flood Management
Flash Flood Prediction
Water Supply
Transportation
Emergency Management
Agriculture
Debris Flows
Ecosystems Management
Hydrologic Design
Research
Customers
NWS
NOAA
Federal Agencies
Tribal Agencies
State Agencies
Local Agencies
Private Sector
Academia
Hydrologic, Environmental Engineers
MPR
Multi-sensor product
High Resolution
Unbiased
Continental U.S
Multi-Sensor Precipitation REANALYSIS
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Research to Operations
Product Dissemination – THREDDS Data Serverhttp://eclipse.ncdc.noaa.gov:9090/thredds/dodsC/radar/catalog.html
Customer Feedback
2005 2006 2006 2007 Operational ?
Reanalysis Research
Regional ProductDevelopment
CONUS ProductDistribution
ProductRe-Development
New Data Sources
Multi-Sensor Precipitation REANALYSIS
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NEXRAD and GEWEX
Precipitation products can help meet Phase II Objectives
• Research quality data sets– Biases addressed and Uncertainty characterized
• Energy and Water Cycle contribution to Climate– Major input to Energy and Water Budget studies
• Space-Time characteristics of predictability of key variables
– Data resolution affords for assessing space-time characteristics
• Seasonal prediction of water and energy cycle variability– Long term allows for intra and inter annual studies
• Assess climate prediction and global change– Can be input or benchmark for climate studies
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WGPRN
Determine the feasibility of producing common precipitation products from radar networks for a common time period.
• Data Format
• Data Transmission
• Archive
• Data Access
• Resolution (Space and Time)
• Algorithms
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WGPRN
Common Data Model
File Format#N
File Format#2
File Format#1
Visualization&Analysis
NetCDF file
OpenDAP Server
WCS Service
CDM
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WGPRN
Possibilities and Associated Issues
• C,X,S etc.
• Yes, No
• Radar Product Generator
• Level II data (Z,V,W)
• 1o by 1km
• NOAAPort
• Standards
• National Archive Center
• Band
• Doppler Capabilities
• Data Processing
• Base Data
• Data resolution
• Data Transmission
• Data format
• Data Archive
• Attenuation
• Severe Weather
• Internal Standard
• Variables
• File size
• Data Transmission
• CDM
• Central Location
Example at NCDC• Agreements with Canada, Mexico, Korea
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Conclusions
• 150 NEXRAD sites– Data format, organization, management
• Provide for high resolution precipitation estimates– Space scales 4km and less– Temporal scales hourly and less
• Archive is 10+ years– Allows longer term investigations– Current Reanalysis project
• CONUS to other Continental-Scale implementations– Common Data Format– Data Archive– Data Transmission– Data Accessibility
http://www.ncdc.noaa.gov/oa/radar/radarresources.html