Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

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Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR)

Presentation transcript:

Lightning Potential Index (J/Kg) (Yair et al.2010,JGR) Lightning Potential Index (LPI) is a measure of the potential charge separation that leads to lightning flashes in convective TSs. It is calculated from model simulated updraft and microphysical fields within the charge separation region of clouds between (0 o C and - 20 o C), where the non inductive mechanism involving collisions of ice and graupel particles in the presence of supercooled water is most effective (Saunders, 2008). So, the LPI is defined as the volume integral of the total mass flux of ice and liquid water within the “charging zone” in a developing thundercloud. The LPI (J kg-1) and is defined as, Where V is the volume of air in the layer between 0oC and -20oC, w is the vertical wind component (m s-1), and qs, qi and qg are the model-computed mass mixing ratios for snow, cloud ice, and graupel respectively (in kg kg-1).€ is a dimensionless number that has a value between 0 and 1 and is defined by, Where Ql is the total liquid water mass mixing ratio (kg kg-1 )and Qi is the ice fractional mixing ratio (kg kg-1 ) defined by, In essence, € is a scaling factor for the cloud updraft and attains a maximal value when the mixing ratios of supercooled liquid water and of the combined ice species (the total of cloud ice, graupel, and snow) are equal., calculation of the LPI from the cloud-resolving atmospheric model output fields can provide maps of the microphysics based potential for electrical activity and lightning flashes.

IC:2019041700

IC:2019041700

Day1 IC:2019041700

Day2 2019041700

IC: 2019041700 Day1

IC: 2019041700 Day2

48 Hour Forecast IC: 2019041700 Hourly evolution of IMD: WRF (3km) Derived :Lightning Potential Index (J/kg)

48 Hour Forecast IC: 2019041700 Threat Level : LOW: LPI < 0.001 and >0.005 Threat Level : Moderate: LPI :< 0.01 and > 0.001 Threat Level : High : LPI > 0.01

IC: 2019041700 48 Hour Forecast SCP: Supercell Composite parameter Hourly evolution of IMD: WRF (3km) Derived : Supercell Composite Parameter Threat Level : LOW: 3 < SCP < 5 Moderate: 5 < SCP < 7 High : SCP > 7

LAYRH : Layer Mean Relative Humidity IC: 2019041700 48 Hour Forecast Hourly evolution of IMD: WRF (3km) Derived :Layer Mean Relative Humidity Threat Level : LOW: 20 < LAYRH < 40 Moderate: 40 < LAYRH < 60 High : LAYRH > 60