Green contours indicate the probability of hazardous precipitation occuring at least one day in the forecast period. Contours are plotted at 5,10,20,30, etc... percent with values greater than 50% shaded in.
Black dashed lines are the climatological probability of hazardous precipitation occuring at least one day in the forecast period, with contours plotted every percent.
A hazard is defined as the greater of either this value or 1 inch per day.
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