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Fig. 9 Threat scores (left) and biases (right) for 24-h total precipitation for forecasts verifying Mar through June, 1997, for day 1 (12-36 h, upper row) and day 2 (36-60 h, lower row). Operational forecasts are solid lines, new system dashed. Number of grid boxes (scaled by 10,000) where observed precipitation exceeded each threshold is indicated by triangles. Thresholds are in inches.