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GR02T: Potential for Severity and Hail
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GR02T (GR02-Trial) is an algorithm designed to highlight the potential for
the development of severe convection and hail. It is a more sophisticated version
of GR02 (Galvez and Santayana, 2019). The difference between GR02 and GR02T is
that the latter computes a single quantity that relates to
severity and hail occurrence. This quantity is plotted in color shades.
The closed contour and boxes of GR02 are then overlaid for comparison
and to complement the analysis.
Initial qualitative verification of GR02T suggests that the shades indicate:
Black = No risk for severity or hail.
Dark Blue = Strong thunderstorms.
Gray = Strong thunderstorms with a marginal potential for severity*.
Green = Moderate potential for severity* and a marginal potential for hail.
Red = Moderate potential for severity* and a moderate potential for hail.
Fucsia = Elevated potential for severity* and an elevated potential for hail.
Confidence on the potential for hail increases if boxes and red/fucsia
contours appear over the
color shades that indicate some potential for strong convection or severity.
*Severity: Implies the occurrence of weather hazards produced by thunderstorms that
include one of the following processes or a combination of many: Strong winds,
hail, heavy rainfall, and/or enhanced electrification.
Request to the users:
The individual and combined skills of the hail predictors (color shades in GR02T
and colored countours encircling boxes in GR02) should be evaluated to determine the best
way to use the macro and which parameters might need adjustment.
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