Relationships between Lightning and Radar Parameters in the Mid-Atlantic Region Scott D. Rudlosky Cooperative Institute of Climate and Satellites University.

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Presentation transcript:

Relationships between Lightning and Radar Parameters in the Mid-Atlantic Region Scott D. Rudlosky Cooperative Institute of Climate and Satellites University of Maryland at College Park Henry E. Fuelberg Department of Earth, Ocean, and Atmospheric Science Florida State University Southern Thunder Workshop Wednesday 13 July 2011

Research Objectives Determine relationships between lightning and radar to better differentiate between severe and non-severe storms Examine environmental influences on storm structure, severity, and lightning production in the Mid-Atlantic region Compute correlations between CG and IC characteristics, and also between lightning and radar parameters Investigate how storm structure (isolated vs. line/multicell) influences lightning production and its relation to storm severity Compare IC products at 2×2 and 8×8 km resolutions with both CG lightning and radar-derived parameters to investigate the suitability of the coarser GLM resolution

Warning Decision Support System Generate lightning and radar products NLDN, LDAR/LMA, GLM-FED RUC-derived near-storm environment WSR-88D, plus merged parameters Identify and track individual storm cells Track total lightning and radar parameters within individual storms Many variations of parameters Prepare storm database Automated procedures Statistical analyses of many lightning and radar-derived parameters Reflectivity at -20 C K-means Clusters Composite Reflectivity Cluster IDs Flash Initiation Density Flash Extent Density

Study Overview Introduces our analysis methods and the resulting storm database Many storms on 61 case study days Compare and Contrast Severe versus Non-Severe Isolated versus Line/Multicell Total Storms = 1667 (1245) 58,969 (34,953) 2-min points = 1966 h Average duration = ~71 min 460 Severe 1207 Non-Severe Mid-Atlantic Study Domain Sample size (N) strongly influences our statistical results

Additional Details Storms were selected based on their duration and relative location Storms were defined as 1) severe or non-severe and 2) isolated or line/multicell throughout their entirety Study only examines the maximum values for each storm time/location (vs. average values)

Synoptic and mesoscale systems influence storm-scale distributions Manual inspection of all 1667 storms revealed several recurring features Spatial GIS plots illustrate these features Display average values for each grid cell Average hour shows the importance of diurnal heating in this region Average Hour (UTC) Line/multicell storms are more numerous and typically last longer Isolated (severe) storms occur most frequently over central Maryland Line/Multicell PercentageSevere Percentage

Storms exhibit considerable variability within the Mid-Atlantic Region IC-FED illustrates the decreasing LMA DE with increasing range This limitation restricted our intercomparison of lightning and radar to within 150 km of the LMA -CG Characteristics Flash density exhibits no clear maximum Multiplicity and estimated peak current are greatest in the coastal regions and line/multicell storms 0047 UTC 0054 UTC IC Flash Extent Density-CG Flash Density -CG Multiplicity-CG Peak Current

Values of individual lightning and radar parameters can describe the likelihood that a given storm is severe or non-severe MESH > 15 mm 53.7% vs. 18.2% H30above263K > 6 km 67.5% vs. 24% IC-FED > % vs. 28.5% -CG Density > % vs. 37.3% Flash density units are flashes km -2 min -1

Correlations help identify relationships between lightning and radar parameters Confirmed several relationships that previously had only been documented in relatively few storms Flash-based IC products are better correlated with CG lightning and radar-derived parameters than are source-based products MESH, a composite of several radar parameters, is better correlated with IC–FED (0.542) than –CG flash density (0.482) Strong correlation between 2×2 km and 8×8 km IC-FED (0.935) Both resolutions are similarly correlated with CG and radar parameters Suggests that the GLM will provide valuable storm-scale IC information comparable to the 2–D information provided by local LMA networks

Profile histograms illustrate relationships between lightning and radar parameters Relationships are similar in both severe and non-severe storms

Additional Results -CG flash density, multiplicity, and peak current are intercorrelated and directly related to the height of 30 dBZ above -10˚C -CG multiplicity and I p are inversely related on the storm scale, and are greatest in deep (line/multicell) storms Line/multicell storms were more intense than isolated storms in our database (i.e., greater flash rates and stronger radar-derived parameters) +CG peak current is inversely correlated with IC lightning and radar-derived measures of storm intensity

Summary Demonstrated our ability to examine many lightning and radar parameters in a large number of storms Revealed storm-scale relationships between CG and IC characteristics, and also between lightning and radar parameters Identified differences between isolated and line/multicell storms Showed that individual lightning and radar parameters can help determine the likelihood that a given storm is severe Combinations of CG and IC datasets will ensure that these data are used to best advantage both now and in the future

Case Study May 2007 Much of Florida was experiencing a severe drought as a surface cold front approached the area Okefenokee wildfires were producing widespread smoke Two distinct regions of storms Drier environment to the north Sea-breeze induced convergence to the south 11 May May 2007 Both regions initiate wildfires and produce severe weather

Storms nearest the active wildfires produce predominately +CG flashes Smoke-enhanced +CG production Observed in storms directly associated with the source fires, and also in storms at long distances down wind Reversed polarity charging likely is related to… Strong updrafts (less entrainment) Smoke-related CCN (larger, but fewer) increased competition Greater supercooled water content in the mixed phase region Strong +CG flashes often exhibit both large I p and LCC Northern Storms Southern Storms Red = +CG Blue = -CG