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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

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
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
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
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
WSR - 88D sites used by WFO FWD
  • Dedicated
  • KFWS, KGRK
  • Others
  • KDYX, KFDR
  • KSHV, KEWX
  • KTLX
ncar auto nowcaster project
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
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
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
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
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
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
AWIPS Display of LDAR II Data

Option 1: Use Volume Browser

awips display of ldar ii data15
AWIPS Display of LDAR II Data

Option 2: Use D2D Main Menu - Obs

current fwd color scale for ldar ii gridded imagery
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
AWIPS Examples
  • Increase in Total Lightning Activity and Patterns in FED imagery highlight severe weather potential
  • April 10, 2005
slide18

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

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

85 mph Tstm Gust at 2348 UTC

2345 UTC

slide22
AWIPS Examples
  • New updraft development on the southern flank of a supercell
  • April 25, 2005
4 panel reflectivity 2112z
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
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
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
FED 2230 UTC 11 July 2005

FED 15

VIL 55

G60 and ¾ in hail at 2230 UTC

fed 2252 utc 11 july 2005
FED 2252 UTC 11 July 2005

FED 6

VIL 41

Wind Damage near Mesquite 2250 UTC

slide35
AWIPS Examples
  • Interesting Branching and Anvil Lightning
  • April and May, 2005
summary and ideas for future work
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
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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