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Use of LDAR II Data at WFO Fort Worth During Spring 2005. Greg Patrick NOAA/NWS Fort Worth TX. Southern Thunder Workshop July 25, 2005. Overview. WFO FWD Operations Background and Dataset Examples of LDAR II applications at WFO FWD Severe Weather Aviation

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Use of ldar ii data at wfo fort worth during spring 2005 l.jpg

Use of LDAR II Data at WFO Fort Worth During Spring 2005

Greg Patrick

NOAA/NWS Fort Worth TX

Southern Thunder Workshop

July 25, 2005


Overview l.jpg
Overview

  • WFO FWD Operations

  • Background and Dataset

  • Examples of LDAR II applications at WFO FWD

    • Severe Weather

    • Aviation

  • Summary and Ideas for Future Work


  • 46 counties of responsibility for warnings and forecasts l.jpg
    46 Counties of Responsibility for Warnings and Forecasts

    Tornado, Severe Thunderstorm, Flash Flood Warnings

    Hazardous Weather Events – warnings, watches, advisories, statements

    Short Term and 7 Day public forecasts



    Aviation forecasts l.jpg
    Aviation Forecasts

    • Five TAF sites

    • Airport Weather Warnings for KDAL and KDFW (35 kts or ½” Hail)

    • Brief Airport Operations Personnel

    • Coordinate with CWSU


    Wsr 88d sites used by wfo fwd l.jpg
    WSR - 88D sites used by WFO FWD

    • Dedicated

    • KFWS, KGRK

    • Others

    • KDYX, KFDR

    • KSHV, KEWX

    • KTLX


    Ncar auto nowcaster project l.jpg
    NCAR Auto-Nowcaster Project

    • Nic Wilson (OU – SOM)

    • Research Goals

    • Explore applications of total lightning data taken from LDAR II, specifically in the area of nowcasting

    • Research the effectiveness of Flash Extent Density as a representation of total lightning data and its applications toward identifying storm cells and their attributes

    Initiation Likelihood Field from ANC

    July 13, 2005



    Ldar ii network and data l.jpg
    LDAR II Network and Data

    • 7 sensors in DFW area

    • VHF pulses used to reconstruct individual cloud and CG flashes in 3D

    • Range approx 150 km

    • Data file (netCDF) arrives at WFO Fort Worth every 2 min

    • Nine data products available for display on AWIPS

    • Flash Extent Density (FED) is concise integration of data


    Flash extent density l.jpg

    Individual sources shown as red dots...

    Flashes can be visualized better if you “connect the dots” in a realistic way, converting sources to branches….

    Flash Extent Density


    Flash extent density11 l.jpg

    Individual sources shown as red dots...

    Flashes can be visualized better if you “connect the dots” in a realistic way, converting sources to branches….

    Define Flash Extent Density as the number of branches/minute that pass through a grid box area…

    Flash Extent Density


    Flash extent density12 l.jpg

    Flash Extent Density is the number of lightning branches that pass through a specific grid box area during a specific time interval

    Computed after all lightning sources are grouped together into flashes

    FED units are Flashes km-2 min-1

    Flash Extent Density


    Gridded ldar ii data in awips l.jpg

    Available via Volume Browser

    Flash Extent Density

    0-20 km Source Density

    Flash Initiation Point Density

    0-3 km Source Density

    3-6 km Source Density

    6-9 km Source Density

    9-12 km Source Density

    12-15 km Source Density

    15-18 km Source Density

    Available via main D2D Menu

    Flash Extent Density

    0-20 km Source Density

    Gridded LDAR II Data in AWIPS


    Awips display of ldar ii data l.jpg
    AWIPS Display of LDAR II Data

    Option 1: Use Volume Browser


    Awips display of ldar ii data15 l.jpg
    AWIPS Display of LDAR II Data

    Option 2: Use D2D Main Menu - Obs


    Current fwd color scale for ldar ii gridded imagery l.jpg
    Current FWD Color Scale for LDAR II Gridded Imagery

    Units - Flash Products:Flashes km-2 min-1

    Units - Source Products:Discharges km-2 min-1

    Highest Value of FED observed ~ 30

    0-20 km Source Density values can be in this range

    Compressed the scale used for radar imagery

    Customized based on values of FED observed during spring 2005


    Slide17 l.jpg

    • AWIPS Examples

    • Increase in Total Lightning Activity and Patterns in FED imagery highlight severe weather potential

    • April 10, 2005


    Slide18 l.jpg

    FED 4 Panel 2324 UTC to 2330 UTC

    FED 5

    VIL 53

    FED 8

    VIL 53

    2324Z

    2326Z

    FED 13

    VIL 51

    FED 15

    VIL 51

    2328Z

    2330Z


    Slide19 l.jpg

    FED 2338 UTC on 10 April 2005

    FED 11

    VIL 44

    2338Z


    Fed 2340 utc on 10 april 2005 l.jpg
    FED 2340 UTC on 10 April 2005

    FED 13

    VIL 48

    2340Z


    0 5z 2345 utc on 10 april 2005 l.jpg
    0.5Z 2345 UTC on 10 April 2005

    85 mph Tstm Gust at 2348 UTC

    2345 UTC


    Slide22 l.jpg

    • AWIPS Examples

    • New updraft development on the southern flank of a supercell

    • April 25, 2005





    4 panel reflectivity 2112z l.jpg
    4 Panel Reflectivity 2112Z

    0.5 deg

    600’ AGL

    10.0 deg

    10,000’

    19.5 deg

    19,000’

    14.0 deg

    14,000’


    4 panel reflectivity 2117z l.jpg
    4 Panel Reflectivity 2117Z

    0.5 deg

    600’ AGL

    10.0 deg

    10,000’

    19.5 deg

    19,000’

    14.0 deg

    14,000’


    Slide28 l.jpg

    • AWIPS Examples

    • “Pulse” Severe Thunderstorm over Dallas County in a high CAPE and weak shear environment

    • July 11, 2005





    Fed 2230 utc 11 july 2005 l.jpg
    FED 2230 UTC 11 July 2005

    FED 15

    VIL 55

    G60 and ¾ in hail at 2230 UTC



    Fed 2252 utc 11 july 2005 l.jpg
    FED 2252 UTC 11 July 2005

    FED 6

    VIL 41

    Wind Damage near Mesquite 2250 UTC


    Slide35 l.jpg

    • AWIPS Examples

    • Interesting Branching and Anvil Lightning

    • April and May, 2005






    Summary and ideas for future work l.jpg
    Summary and Ideas for Future Work

    • FED imagery, with a 2 minute update frequency, has been used as a complement to WSR-88D imagery to help forecasters detect important storm-scale clues on convective organization

    • Total lightning has proven valuable in aviation forecasting, specifically with regard to the inclusion or exclusion of thunderstorms in TAFs. FED imagery helps forecasters visualize and understand the thunderstorm and CG lightning threat.

    • A time-integrated source density product could be developed and used to disseminate a graphical lightning hazard message. This product would be especially useful for delineating the CG threat in thunderstorm anvils and stratiform regions of MCSs.

    • Explore the application of Source Density and Flash Initiation Point Density products


    Acknowledgements l.jpg
    Acknowledgements

    • Matt Sardi (ITO FWD) and Jason Burks (ITO HUN) accomplished the special configuration needed to allow LDAR II data to be displayed in AWIPS D2D

    • Nick Demetriades (Vaisala Corp) is the co-author on the conference presentation and supplied some of the images used in this presentation.


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