Copyright C. Doswell A Few Issues Concerning Nowcasting Applications Based on Oklahoma Lightning Mapping Array Data Don MacGorman NOAA/National Severe.

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Presentation transcript:

Copyright C. Doswell A Few Issues Concerning Nowcasting Applications Based on Oklahoma Lightning Mapping Array Data Don MacGorman NOAA/National Severe Storms Laboratory CIMMS/University of Oklahoma and NOAA

Present OKLMA

Planned Expansion

Switching to internet communication through ONENET towers of Univ. of Oklahoma Regents Just successfully switched one station to internet Goals: Reduce latency to 1 min Add remote stations Download all data remotely

29-30 May 2004 Flash Rates Sudden jump in flash rates just before first F-2 tornado Estimated peak flash rate of 8/second Time (UTC) Flashes (per min) F2

Reflectivity and LMA Event Density X (km) Altitude (km MSL) Radar: 0016:45 – 0018:32 UTC LMA Data: 0015 – 0020 UTC 45 dBZ 6.8 km MSL A B

24 May :58 UTC 2.2 minutes

Preliminary Findings Lightning in overshooting top of all warm- season supercells checked thus far Lightning not in overshooting top of much shallower February supercell

Anvil Flash 29 May 2004, 2321:45 UTC

Anvil-Initiated Flashes 5/30/04 LMA data 0030: :30 UTC Radar data UTC 8 flashes / min in anvil

2328:43 UTC 24 May 2004 Flash Initiation in Anvil: Reflectivity Max

2328:43 UTC 24 May 2004 Initiation Flash Initiation in Anvil: Reflectivity Max

0107:48 UTC 30 May 2004 Flash Initiation in Anvil: Screening Layer

Positive Screening Layer Charge Negative Storm Charge 0107:48 UTC 30 May 2004 Flash Initiation in Anvil: Screening Layer

Initiation of Anvil Flashes in or near –Core of storm –Screening layer charge –Reflectivity maximum –Anvil-anvil interaction Ground Flashes beneath Anvil with –Rain –Virga –Anvil below melting/freezing height Preliminary Findings

Low-top supercells –2 cold-season cases –No anvil lightning Polarimetric radar data comparison –No obvious patterns –Helpful in determining freezing level Preliminary Findings (continued)

Comparison of Height Distribution in Two Supercell Storms Seasonal Variation Mid-FebruaryLate March

Height of peak in vertical source distribution coincides roughly with height of -30 deg C isotherm Z -30 C

Sources / 2 min in 3 Storms of Varying Severity

30 May :39:06 UTC 1 second

26 May :53 UTC 17 seconds

LMA Mapped Points 30 May :21 UTC

Status and Plans for the Oklahoma Lightning Mapping Array Don MacGorman, NOAA/National Severe Storms Laboratory CIMMS/Univ. of Oklahoma & NOAA

Small Continual Lightning Activity in the Overshooting Turret of Supercell Storms Photo copyright by Michael James, 2003 Don MacGorman, NOAA/NSSL, CIMMS Kristin Kuhlman, CIMMS/Univ. of Oklahoma & NOAA Paul Krehbiel, New Mexico Institute of Mining and Technology Mike Biggerstaff, University of Oklahoma