Water Resources of the United States

PROJECT ALERT NOTICE (CA) Flooding expected in Southern California

Date: Fri, 09 Sep 2022 12:09:17 EDT

Summary: Heavy rainfall from the outer bands of Hurricane Kay is expected to cause widespread flooding and landslides in parts of Southern California.

Upwards of six inches of rain is predicted to fall in the stretch of mountain from City of Banning to the Mexico Border, with most of the rainfall occurring over the next 24 hours. Heavy rainfall is expected to cause flash flooding and landslides starting Friday and through the weekend. Flooding and landslides are likely to be exacerbated by the many burn areas throughout the region. There is a low chance of tropical force storm winds today.

Earlier this morning, the rainfall started in the southern area. Today, five field crews of two people each from the Poway Field Office are in the process of mobilizing across their field areas, and they are expected to measure at their sites through Saturday and potentially into Sunday or Monday. The Redlands Field Office is on stand-by in the event their field area is affected or they need to support the Poway Field Office. Santa Maria is sending one field crew of two people to the Piru area today because the area can be difficult to access during events, while the rest of the field staff are watching conditions in their field area.

FEMA Region IX has been contacted about interest in highwater marks in the area.

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