RUC 00-hr Bulk Shear (0-1, 0-3, 0-6 km) 4/18 18 UTC.

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By 18 UTC, the low-level shear was strengthening, remaining strong enough to support bow echoes and supercells. Still, the 0-1 km shear was somewhat less than the SPC analysis (15 kts vs. 20 to 25 kts).