NCAR Activities Using TAMDAR Icing Data

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NCAR Activities Using TAMDAR Icing Data

• Marcia K. Politovich, Jamie Braid
• Scott Landolt and Cory Wolff
• NCAR Research Applications Laboratory

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Projects

• Impacts on Current Icing Potential product
• What Determine the impact of TAMDAR icing
  reports (positive and negative) on icing
  diagnoses
• Why Do results support FAA/NWS funding of TAMDAR
  data stream?
• Funded by AIRDAT
• Description of icing data set
• What Compile climo of TAMDAR icing data using
  RUC and CIP outputs
• Why Will help QC efforts what are these
  reports, are they consistent with expected icing
  conditions, are we seeing inconsistencies?
• Funded by FAA

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Laser senses 0.020 ice accreted here

• Yes activates heating cycle to melt and start
  over again
• No no ice detected
• Uncertain
• Ttot gt0C,
• Tstat lt0C
• (ice wont freeze onto probe)

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CIP impact progress

• Converted TAMDAR data sets to pseudo PIREP NetCDF
  data
• Determined HRCIP run times for study
• Completed baseline verification using voice
  PIREPs and standard QAPDT methods

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CIP concept
Lightning Deep Convection
m
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High-res (5 km) CIP
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PIREPs in CIP

• Used as a boosting factor for icing potential
  (along with RUC SLW and VV)
• Currently, only positive icing PIREPs are used
• icepotfinal icepotini(0.35PIREPmap
  .4SLWmap .25VVmap)
• severity 1-8 scale (T1, H8, etc.),
• PIREPmap severity/8
• and weigh by proximity in space and time
• Need to determine how to use negative TAMDAR
  icing data decrease potential

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CIP Comparison

• Three-way comparison
• Baseline no TAMDAR
• Add TAMDAR positive icing reports
• Add TAMDAR negative icing reports
• Compare PODy, PODn, area and volume covered
• What is the effect on the statistics? On the look
  and feel?

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TAMDAR Icing Climo

• Use ASCII files for location of positive icing
  reports
• Form climatology time of day, location, by
  month, etc. Where is icing being reported?
• Use matching hourly 20-km RUC forecasts to pull
  info on temperatures, RH, condensate
• Can use positive TAMDAR icing data to verify
  RUC condensate fields
• Use matching CIP icing potential to check our
  expectations on icing positive and negative

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Ice Accretion?

• New icing severity definitions are accretion-rate
  based
• Updated CIP severity
• Accretion rate depends on object shape, airspeed,
  etc
• Were interested in working with AIRDAT on this

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More ideas?