Flash Flood in Grant County, Washington

Flash Flood May 17, 2018 · Grant County, Washington

$100K

Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Flooding from heavy rain producing thunderstorms occurred in Ephrata during the late evening of May 17th. Basin Street, the main road through the downtown business district was flooded with 4 to 8 inches of water with first floor damage to multiple businesses in the downtown area. A portion of the ceiling in the Department of Corrections building collapsed due to standing water on the roof.

The wider storm

Thunderstorms developed over the east slopes of the Cascades and the Columbia Basin in a rich feed of wrap around moisture from an upper low over Oregon during the night of May 17th. These storms dumped a general quarter to half inch of rain over most of the western basin, but individual cells locally produced higher amounts with Ephrata measuring 0.72 inches. Local flash flooding and debris flows were noted from these storms.

Began near Ephrata (47.3275, -119.5552).

Source: NOAA Storm Events Database, event 758680. Narratives are written by the National Weather Service forecast office that issued the report.

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