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NASA / SPoRT Update


NASA / SPoRT Update Coordination Call: Friday 4/16/10 Agenda items: MODIS/GOES Hybrid UAH s CI and CTC data files to NOAA/HWT/EFP Lightning Data transfer ... – PowerPoint PPT presentation

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Title: NASA / SPoRT Update

NASA / SPoRT Update
Coordination Call Friday 4/16/10
  • Agenda items
  • MODIS/GOES Hybrid
  • UAHs CI and CTC data files to NOAA/HWT/EFP
  • Lightning Data transfer, Psuedo-GLM code,
  • Lightning Warning Algorithm
  • MODIS/AMSR-E SST Composite

Work done by Gary Jedlovec, Matt Smith, Kevin
  • Running in real time, but currently working out
    the data ingest and bowtie correction logistics
    for MODIS.
  • Need to remap MODIS to 2km IR to more accurately
    portray ABI channels
  • Need to examine timing discontinuities at edges
    and possible limb-correction
  • Product introduced to WFO Partners in March
    They expressed high interest.

MODIS 1km / GOES 4km IR over SW U.S. at 1845Z (2
MODIS swathes)
UAHs CI and CTC data files to NOAA/HWT/EFP
Work by Kevin Fuell, Jon Case, John Walker (UAH),
Chris Siewert, Greg Grosshans
  • NASA/SPoRT asked to assist with the transfer of
    AWG Convective Initiation and a Cloud Top Cooling
    product for use during Spring Experiment 2010
  • AWG CI product is by University of Alabama
  • SPoRT already sending LMA data in similar fashion
  • SPoRT worked w/ UAH to make N-AWIPS ready file
  • HWT has tested a file and will receive automated
    script from SPoRT and UAH

Real-time KSC Data
Work done by Geoffrey Stano, NASA Lightning Group
  • Lightning group has obtained real-time LDAR
  • First successful ingest into AWIPS
  • Currently at 1 km and 1 min resolution
  • Finalize ingest to WFO Melbourne, FL during SPoRT
    visit April 23
  • Efforts support Spring
  • Experiment

Pseudo-GLM from KSC LDAR II
Data Transition
Work done by Geoffrey Stano, Kristin Kuhlman
  • Finalizing data feeds to Spring Experiment
  • 3 total lightning networks
  • KSC, North Alabama, Washington DC
  • SPoRT personnel to participate in Experiment
  • Methodology for Pseudo GLM has been transferred
  • Providing WES case studies for in-active
    lightning days
  • May 3 and 6, 2009

Lightning Training
Work done by Geoffrey Stano, Eric Bruning
  • Train forecasters on the use of the Pseudo GLM
  • Intended to be viewed before arriving in Norman
  • Followed by in-person training on first day
  • Educate forecasters on potential of GLM era
  • Provide 2 case examples
  • Working to incorporate into the NWS Learning
    Management System

WRF-based Lightning Algorithm
Work done by Bill McCaul, Jon Case, Scott Dembeck
  • Ongoing work to use model microphysics to
    forecast lightning threat (graupel flux,
    vertically integrated ice)
  • NSSL WRF has been configured to output Flash
    Rate Density using hourly max fields. See
  • http//
  • Lightning Threat 1 based solely on graupel
  • Lightning Threat 2 based solely on Vert.
    Integ. Ice
  • Lightning Threat 3 combined use of Threats 1
  • Lightning Threat fields will be evaluated at
    Experimental Forecast Program (EFP) 2010
  • Tie in with the Proving Ground
  • Data assimilation from GLM to improve
    microphysics and storm environment
  • Better initial characterization of microphysical
    fields and therefore improved convective
    forecasts in the very short term (1-6 hours)
  • Request to use Lightning Threat Algorithm in the
    simulated WRF-ABI case event

Pseudo ABI Composite SST Product
Work done by Gary Jedlovec, Frank LaFontaine,
Jaclyn Shafer
  • Application
  • weather forecast community requires continuous
    spatial coverage of SST for model initialization
  • marine weather users benefit from high resolution
    SST data
  • Cloud cover cause a significant problem!
  • MODIS /AMSR-E product relevant to ABI
  • Composite fields of high resolution satellite
    derived SSTs provide a good way to provide this
  • Compositing fills in cloudy or data void regions
    with observations from the previous day(s)
    satellite passes
  • Fixed time replacement preserves diurnal cycle
    captured with foursnapshots from polar orbiting

Pseudo ABI Composite SST Product
Problem The regional weather forecast
community requires continuous spatial fields of
surface parameters for model initialization.
Composite fields of high resolution satellite
derived SSTs may provide a good way to provide
this data. However, persistent cloud patterns
can cause product latency and reduced accuracy.
  • Previous work developed a SST composite product
    with MODIS data to provide high-resolution SST
    data over limited regions (Haines et al. 2007)
  • Impact of MODIS SSTs (versus RTG) on fluxes of
    heat / moisture and subsequent weather forecasts
    was significant in coastal regions (Lacasse et
    al. 2008 Case et al. 2009)
  • Regions of high latency reduced accuracy and
  • Just finished a collaborative project with
    PO.DAAC at JPL
  • Developed an enhanced SST composite product
    reduced latency
  • MODIS and AMSR-E, PO.DAAC L2P data stream,
    latency weighted compositing algorithm
  • Demonstrate improvement and impact on forecasts

Pseudo ABI Composite SST Product
  • Approach overview
  • Increased SST data availability transition from
    direct broadcast to more complete data source
  • Bring in AMSR-E SST data for coverage in
    persistent cloud regions
  • SST compositing algorithm changes latency,
    error, and resolution weighted product
  • Use near real-time L2P data stream (JPL) for
    MODIS and AMSR-E passes more passes
  • expand product coverage
  • pixel by pixel quality estimates and bias
  • slight additional delay in
  • data access tolerable
  • better cloud / rain detection
  • AMSR-E data coarse resolution with
  • no data near coast

Pseudo ABI Composite SST Product
  • Approach details
  • A collection of MODIS and AMSR-E SST values
    corresponding to the last 7 days is obtained for
    the JPL PO.DAAC for each pixel in a product
    region (at 1 km resolution), for the four Terra /
    Aqua overpass times
  • MODIS proximity flags 4 and 5, bias adjustment
  • AMSR-E proximity flag 4
  • Apply latency weighted compositing scheme to the
    collection at each point in the 1 km resolution
    output file
  • where SSTcp (I,j) is a composite SST value
    at a point (I,j),
  • SST(I,j,k) is a SST collection (k is an
    index corresponding to date of data in
  • L(k) is the latency (in days) of a
    particular SST value in the collection, and
  • Wt(d,k) is a data weight factor where d
    corresponds to either MODIS (Wt1.0), AMSR-E
    (Wt0.20), or some other value for another
    instrument source.
  • The inverse latency formula uses all data in the
    collection and allows more recent data to have a
    greater influence on the composite
  • The reduced AMSR-E weight factor (Wt) accounts
    for the large footprint compared to MODIS

Pseudo ABI Composite SST Product
  • MODIS alone produces a high-resolution (1km) SST
    composite but with some latency issues and gaps
  • AMSR-E alone reduces latency in the SST composite
    with coarser resolution data, but not near land
  • Enhanced MODIS / AMSR-E SST composite a blend of
  • Product available 4x a day corresponding to Terra
    (day and night) and Aqua (day and night)

OSTIA or NESDIS POES/GOES SST product (with a
Wt0.20) used to fill in where neither MODIS nor
AMSR-E coverage is complete (a few coastal areas)
Pseudo ABI Composite SST Product
Validation 4 regions, 4 seasons, 4 times a
day 60-70 fixed buoys (coastal and gradient
regions), 90-100 drifting buoys (more open ocean)
per time - bias and rms
  • Enhanced (black) much improved over MODIS only
    (red) at all times due to reduced latency
  • Drifting buoy (solid lines) biases smaller than
    fixed (dashed)
  • Biases generally lt0.20 C, RMS lt0.50 C
  • Trend in MODIS only due to latency no trend in
    enhanced SST composite bias

Pseudo ABI Composite SST Product
Forecast impact High resolution SSTs have had a
positive impact on a forecast applications
Pseudo ABI Composite SST Product - GOES-R PG
  • Current product available in WRF EMS and selected
  • 1km resolution (2km in WRF EMS), 4 times a day
  • Planning to adapt product to GOES ABI resolution
  • 1-3 hourly, 2 km resolution
  • compare to current POES / GOES once daily
    product (Maturi)
  • monitor accuracy
  • Eventual dissemination to WFOs, etc.
  • Will collaborate with AWG on application and use
  • Positive impact on regional weather forecasts
  • Real-time data available from NASA / SPoRT
    (GRIB2) ftp//
  • Also available from JPL PO.DAAC in GRIB2 and
    netCDF (May 2010)
  • SPoRT http//
  • sst_comparison.html