C. Schultz, W. Petersen, L. Carey GLM Science Meeting 12/01/10.

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Presentation transcript:

C. Schultz, W. Petersen, L. Carey GLM Science Meeting 12/01/10

Where we left you in ’09 AlgorithmPODFARCSIHSS Gatlin90%66%33%0.49 Gatlin 4597%64%35%0.52 2σ2σ87%33%61%0.75 3σ3σ56%29%45%0.65 Threshold 1072%40%49%0.66 Threshold 883%42%50%0.67  Six separate lightning jump configurations tested  Case study expansion: 107 T-storms analyzed ○ 38 severe ○ 69 non-severe  The “2σ” configuration yielded best results POD beats NWS performance statistics (80-90%); FAR even better i.e.,15% lower (Barnes et al. 2007) ○ Caveat: Large difference in sample sizes, more cases are needed to finalize result.  M.S. Thesis completed and study accepted to JAMC (Schultz, Petersen, Carey 2009); forms the conceptual basis of the lightning jump ATBD Thunderstorm breakdown: North Alabama – 83 storms Washington D.C. – 2 storms Houston TX – 13 storms Dallas – 9 storms

Case Expansion  Since, we’ve expanded to 638 thunderstorms Primarily from N. Alabama (537) Also included ○ Washington D.C. (49 and counting) ○ Oklahoma (30 and counting) ○ STEPS (22)  Regional expansion has proven robust POD: 82%, FAR 35%, avg. lead time: 22 mins.

DC LMA Results Gatlin2 Sigma3 SigmaThresh4Thresh5 POD FAR CSI HSS PFAR 16.54%30.36%16.67%34.62%30.43%  14 of 15 missed events by the 2σ algorithm were 1 tree knocked down 64 severe events total for the DC sample.  Lightning jumps observed before almost every hail and tornado case 1 tornado missed in entire sample (remnants of TS Nicole) Skill Scores, 2σ, DC LMA region Example, tornadic storm July 16, wind wind tornEF hail

Proving the Utility of Total Lightning  Examined total and CG rates in 30 thunderstorms in four regions of country Total lightning trends outperform CG lightning trends  Schultz et al., WAF, accepted, editing

Low topped/cold season and tropical environments  40% of misses in these environments. Can we still provide utility by tailoring algorithm?  Answer: Tropical maybe, cold/low topped, tougher. Time-height plot of reflectivity (top) and total flash rate (bot) for an EF-1 producing tornadic storm on March 25, Tornado touchdown time ~2240 UTC.

Cold Season/Low Topped  Average peak flash rates: Severe flashes min -1, all have at least 1 flash Non Severe: 6.60 flashes min -1  Some separation occurs at 6 flashes min -1

 Analyzed 8 landfalling TC’s within range of an LMA/LDAR  Average Peak Flash Rates Severe: 6.60 flashes min -1, 5 storms w/o any flashes ○ w/o no flash storms, avg. flash rate 8.90 flashes min -1 Non Severe 6.35 flashes min -1 ○ 0.29 flashes min -1 if non severe from Charley are removed Landfalling Tropical Systems Charley

No tornado, but increases in rotation observed Purple line – total flash rate (flashes min -1 ) Contours - Merged Azimuthal Shear, Smith and Elmore (2004), using WDSS-II Total Flash Rate (flashes min -1 ) 100 km from radar SB CAPE 18Z August 13, km Helicity 18Z August 13, 2004 SB CAPE 18Z Sept. 25, km Helicity 18Z Sept. 25, 2005

Other “misses”  e.g., Feb 6, 2008 EF-4 tornado producing storm, 1117 UTC  Downward trend in total lightning masks any small pulses in electrical activity SigmaDFRDT-6.75Sigma2n SigmaDFRDT-0.25Sigma2n SigmaDFRDT-0.5Sigma2n SigmaDFRDT-3.75Sigma2n SigmaDFRDT4.5Sigma2n SigmaDFRDT-2.75Sigma2n SigmaDFRDT2.5Sigma2n SigmaDFRDT-6Sigma2n SigmaDFRDT-0.25Sigma2n SigmaDFRDT1.25Sigma2n SigmaDFRDT0.25Sigma2n SigmaDFRDT-8.75Sigma2n SigmaDFRDT0.25Sigma2n SigmaDFRDT0.75Sigma2n SigmaDFRDT-4.75Sigma2n SigmaDFRDT-3Sigma2n SigmaDFRDT-2.75Sigma2n SigmaDFRDT1Sigma2n SigmaDFRDT-2.25Sigma2n SigmaDFRDT1Sigma2n SigmaDFRDT-4.5Sigma2n SigmaDFRDT-3.25Sigma2n SigmaDFRDT-6Sigma2n SigmaDFRDT-1.25Sigma2n severe 408 non severe

Examining Environments  Goal: Using commonly used environmental parameters to determine when total lightning will be of most use. Other parameters; temp, theta, theta-e, RH, e,es, r,rvs, etc.

Future Work  Incorporate other satellite/radar products Have robust satellite dataset from GOES-O/P tests ○ In what capacity does high temporal satellite and total lightning information benefit nowcasting of storm growth and decay? Reflectivity/rotation comparisons  Testing of algorithm in real-time this summer at Redstone and White Sands  Work the GLM lightning proxy along with the proxy in the cell tracking framework.