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Automated Volume Scan Evaluation and Termination (AVSET). Field Test Training Presented by Joe Chrisman (ROC) and Jami Boettcher (WDTB). Background. WSR-88D VCPs automatically scan predefined elevation angles

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automated volume scan evaluation and termination avset

Automated Volume Scan Evaluation and Termination (AVSET)

Field Test Training

Presented by

Joe Chrisman (ROC) and

Jami Boettcher (WDTB)

background
Background
  • WSR-88D VCPs automatically scan predefined elevation angles
  • All VCP elevations scanned regardless of areal coverage or significance of return
  • VCP update time fixed
    • All products updated at the fixed VCP completion time interval
why avset
Why AVSET?
  • Faster VCP updates long desired
    • Rotate the antenna faster?
      • More hardware stress and lowers base data quality
    • Sample fewer elevations?
      • Can’t predefine a VCP for every scenario
  • Best option is Automated Volume Scan Evaluation and Termination (AVSET)
avset in a nutshell
AVSET in a Nutshell
  • AVSET makes each volume scan “dynamic”
    • Number of angles scanned is dependent on the sampled meteorological return
  • Sampling above the weather?
    • Then stop the current volume scan and start a new one!
  • AVSET runs at RDA
how avset works
How AVSET Works
  • Terminates volume scan once returns fall below thresholds of dBZ and areal coverage
    • Shortens time between product updates when no significant data exists on higher elevation tilts
    • Antenna rotation rates and base data quality do not change!
  • Details forthcoming…
how avset works1
How AVSET Works
  • Only analyzes data above 5º
    • VCP 31 and 32 not impacted by AVSET
  • To terminate, each condition must be met:
    • ≥18 dBZ over < 80 km²
    • ≥ 30 dBZ over <30 km²
    • areal coverage ≥18 dBZ has not increased by 12 km² or more since the last volume scan
  • If all three conditions are met…
how avset works2
How AVSET Works
  • All three conditions met? Yes!!
    • AVSET terminates the volume scan aftercompletion of the next higher elevation
      • VCP 212 Example: Below thresholds at 5.1°? Will terminate after 6.4°
  • AVSET’s thresholds are defaults for now
avset and vcp 11 example
AVSET and VCP 11 Example
  • Lowest 4 elevations: 0.5°, 1.5°, 2.4°, and 3.4°
    • AVSET does no analysis here!
avset and vcp 11 example1
AVSET and VCP 11 Example
  • Next 4 elevations: 4.3°, 5.3°, 6.2°, and 7.5°
    • AVSET analyzes 5.3°, 6.2°, and 7.5° and
    • Returns are above thresholds
avset and vcp 11 example2
AVSET and VCP 11 Example
  • Next 3 elevations: 8.7°, 10.0°, and 12.0°
    • Returns fall below AVSET thresholds on 10.0°
      • 12.0° is sampled as the last elevation
  • Composite Reflectivity entire coverage
avset processing a closer look
AVSET ProcessingA Closer Look

Returns below AVSET Thresholds

Last Elevation Processed

10°

Elevation we did not scan thanks to AVSET

12°

14°

AVSET thresholds expected to be sufficiently sensitive…

how low can we go
How Low Can We Go?
  • VCP 11 full volume scan time 4 min, 48 sec
    • AVSET shortest update3 min, 12 sec
  • VCP 12 full volume scan time 4 min, 18 sec
    • AVSET shortest update3 min, 12 sec
how low can we go1
How Low Can We Go?
  • VCP 212 full volume scan time 4 min, 36 sec
    • AVSET shortest update3 min, 30 sec
  • VCP 21 full volume scan 5 min, 48 sec
    • AVSET shortest update4 min, 54 sec
avset and range to weather
AVSET and Range to Weather
  • AVSET with storms at close range
    • Entire VCP used
  • AVSET with storms at far range
    • Only relevant elevations above 5° used
areas of conce rn
Areas of Concern
  • Cone of Silence
  • Impacts on user systems
    • Other than bandwidth
  • Level II Bandwidth Impacts
    • Shortened volume scan times
    • More frequent product updates
cone of silence
Cone of Silence
  • Does AVSET increase the risk of missing elevated convection that develops in the cone of silence?
  • VCP 31 or 32 and 1st echo of the day
    • No AVSET impact in Clear Air Mode
cone of silence1
Cone of Silence
  • Worst case so far
    • Storms at long range; VCP 21; AVSET on; VCP terminates above 6.0°
    • New elevated cell very near RDA; AVSET not sampling high, but much more often!
  • Contributor?
    • Avoid VCP 21 andconvection! Gapsaloft!
cone of silence2
Cone of Silence
  • AVSET thresholds very sensitive
    • Threshold not met
    • Anything relevant at higher elevations very unlikely
  • Rapidly developing convection very close to the radar?
    • AVSET alsolooks for increase in areal coverage between scans
cone of silence3
Cone of Silence
  • If ≥18 dBZ increased ≥12 km2 at that elevation since last volume scan
    • AVSET applies even more sensitive thresholds to remaining elevations
      • ≥18 dBZ over < 30 km2 or ≥30 dBZ over <10 km2
    • If below these new thresholds, volume scan terminates after next higher elevation
  • AVSET results in more frequent sampling to find developing elevated convection
slide20

KDMX

    • Storm cluster northeast
    • Isolated storm south
    • One hour intervals
slide22

Parkersburg-Dunkerton EF5 Tornado

T

VCP 212

Osceola EF0-EF1 Tornado

T

VCP 12

AVSET VCP 212

AVSET VCP 12

9 Tornado Warnings Issued During Period

AVSET Volume Scan Average = 3.7 mins

AVSET would have provided six additional volume scans

impacts on user systems
Impacts on User Systems
  • AVSET exercised at ROC since Spring 2009
  • AWIPS – No problems identified
  • OPUP – No problems identified
  • FAA User Systems – No problems identified
bandwidth impact analysis
Bandwidth Impact Analysis
  • Faster VCP updates => more bandwidth needed to send Level II data
    • Single site communications load worst case increase of 25-30%
      • Cumulative network load cannot be estimated using worst case single site figures

National Radar Mosaic from Aug 7, 2008 21:48Z

analysis method
Analysis Method

Radar Used In Analysis

Level II Not Available

  • 29 of 34 radars in area included in analysis
    • Level II data unavailable for five radars
  • Level II data replayed for 2100Z-2259Z on RPG with AVSET
  • No Clear Air VCP data used
bandwidth impact analysis conclusion
Bandwidth Impact Analysis Conclusion
  • Out of 29 sites…
    • 1 had increase of > 30%
    • 4 had increase of 20 - 30 %
    • 6 had increase of 10 – 20 %
    • 8 had increase of 1 - 10%
    • 10 had 0 or < 1% increase
  • Average Level II bandwidth increase over the region due to AVSET < 10 %
field test specifics
Field Test Specifics..
  • Test Objectives
    • Why are we doing this test?
  • User Control
  • Schedule and Participating Sites
  • Reporting results
field test objectives
Field Test Objectives
  • Verify that AVSET supports forecast and warning operations
  • Verify that AVSET does not adversely affect the operation of NEXRAD during active weather periods
  • Verify AVSET-produced volume scans with varying completion durations do not adversely impact
    • Forecast and warning operations
    • User data processing and display systems
user control
User Control
  • AVSET part of RPG Build 12.0 software; however…
    • Only AVSET Field Test sites (you!) get the “turn it on” software
    • Will also receive the “Test Log”
  • AVSET Enable/Disable toggle at RPG HCI
user control avset rules of engagement
User Control:AVSET Rules of Engagement
  • AVSET default state is “Disabled”
    • Automatically disabled with any switch to Clear Air Mode (VCP 31 or 32)
  • AVSET must be enabled manually
    • When any Precipitation Mode VCP is active, AVSET can be activated
      • Once selected, AVSET status PENDING until start of next volume scan
user control avset rules of engagement1
User Control:AVSET Rules of Engagement
  • During Field Test period, use AVSET as often as possible
  • If for any reason you become uncomfortable with AVSET, disable it
    • Please record on the Test Log reason(s) for not using AVSET for the particular event
user control avset rules of engagement2
User Control:AVSET Rules of Engagement
  • Send FTM to all users each time AVSET manually enabled or disabled
    • Console Message windowfrom RPG Control/Status
user control avset rules of engagement3
User Control:AVSET Rules of Engagement
  • Also…
    • Please record date/time when AVSET is enabled or disabled in the Test Log
avset field test your users
AVSET Field Test:Your Users
  • For the DoD and FAA users…
    • If you feel AVSET is compromising your systems or your ability to perform your mission…
    • First contact the WSR-88D Hotline
      • 1-800-643-3363
  • Hotline will verify the problem and will issue request to disable AVSET
  • Please record request & reason in Test Log
field test participants
Field TestParticipants
  • NWS
    • Southern Region:
      • Norman, OK (KTLX) and Melbourne, FL (KMLB)
    • Central Region:
      • Goodland, KS (KGLD), Indianapolis, IN (KIND), Pueblo, CO (KPUX), and St. Louis, MO (KLSX)
    • Eastern Region:
      • Sterling, VA (KLWX) and State College, PA (KCCX)
    • Western Region:
      • Glasgow, MT (KGGW) and Tucson, AZ (KEMX)
field test participants1
Field TestParticipants
  • USAF AFWA
    • 25th OWS, Davis-Monthan AFB, AZ
      • Associated to KEMX, KPUX, and KGGW
    • 15th OWS, Scott AFB, IL
      • Associated to KLWX, KCCX, KLSX, and KIND
    • 26th OWS, Barksdale AFB, LA
      • Associated to KTLX, KLSX, and KMLB
  • FAA
    • Indianapolis ARTCC, Indianapolis, IN
      • Associated to KIND
here s what we know so far
Here’s What We Know So Far
  • AVSET can reduce volume scan duration ≤ 100 s
  • Bandwidth:
    • Per site Level II increase ~28%
    • Per connection narrowband increase ~25%
    • “Regional” Bandwidth increases ~10%
    • Dual Pol bandwidth upgrade expected to support AVSET
  • Cone of Silence:
    • Enhanced logic to address rapid cell growth close to radar
    • Sampling much more often during cell growth time
  • No impacts to user systems identified
avset future plans
AVSET Future Plans
  • Thank you for your participation!
    • Really couldn’t do it without you
  • Given successful completion of AVSET Field Test…
    • Brief NEXRAD SREC on Field Test Results
      • Gain approval to include AVSET in Build 13
    • Submit CCR to make AVSET operational in Build 13
questions
Questions?
  • Joe Chrisman (ROC Engineering)
    • Joe.n.chrisman@noaa.gov
    • AVSET Developer and Field Test Director
      • Work Phone: 405-573-3335
      • Cell Phone: 405-694-5025
    • Can address content, test procedures, logistics
  • Jami Boettcher (WDTB)
    • Jami.b.boettcher@noaa.gov
    • Can address content