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Powerful Storm in the Western U.S.; Heavy Rain and Flooding Threat Across the Central Gulf Coast

A powerful storm system will continue to bring heavy mountain snow, rain, and high winds to the Pacific Northwest and northern California through midweek. Heavy rain and flash flooding potential exists across the central Gulf Coast over the next few days, including the Florida Panhandle. A Slight Risk (level 2 of 4) of excessive rainfall is in effect Tuesday. Read More >

Overview

Strong thunderstorms formed in the high-shear environment that was present as the remnants of once-Category-Five Hurricane Katrina passed through Pennsylvania. A few tornadoes formed as supercell thunderstorms moved through the Great Valley and Lower Susquehanna Valley just after midnight on the 31st. Sporadic wind damage occurred in other areas as well.

ImageDamage path of F1 tornado that occurred in Northern Lycoming County later that night

 

Image

Storm Relative Motion Image (from KLWX (Sterling, VA) radar) around the time tornado was on the ground in Adams County

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