Full Notification

National Weather New Information:
...Moderate to Heavy Rain Expected for Southwest California Tuesday, Tapering to Showers on Wednesday…
...Flash Flood Watch Issued for the Recent Burn Areas of Ventura and Los Angeles Counties Tuesday and Tuesday Night...
MAIN IMPACTS AND TIMING
• Heaviest rain event since last March is anticipated (Tuesday - Wednesday).
• Widespread moderate rain with embedded heavy downpours will be capable of generating mud and debris flows near recent burn areas (Springs, Colby, Madison, Powerhouse, Williams) along with urban flooding. (early Tuesday - Tuesday night)
• Rainfall rates around 0.50 inch per hour are likely to occur.
• Gusty east to southeast winds could cause local tree damage and/or power outages.
• Potential high surf conditions and high rip current risk from south Santa Barbara County coast to Los Angeles County coast. (Tuesday afternoon - Wednesday)
FORECAST CONFIDENCE
High confidence: storm impacts, timing, and track
Moderate confidence: end of storm impacts Tuesday night and Wednesday.

PRECIPITATION AMOUNTS (Storm Total)

Coasts/Valleys: 1-2 inches and up to 3 inches or more near the foothills of Ventura and Los Angeles Counties.
Foothills/Mountains: 3-5 inches and locally up to 6 inches on south facing slopes, especially Ventura and Los Angeles Counties.

SYNOPSIS
A large low pressure system over the eastern Pacific Ocean will bring a subtropical plume of moisture, or atmospheric river, across southwest California starting early Tuesday morning. Light rain will likely start before sunrise and become widespread and heavy at times Tuesday morning through Tuesday evening. Rain will continue to be moderate to heavy at times Tuesday night, especially for the foothills and mountains of Ventura and Los Angeles Counties. Although the potential for thunderstorms will be less than a 10 percent chance, lightning could occur in some of the heavier rain bands on Tuesday and Tuesday night. Snow levels will remain above 10,000 feet during the bulk of the precipitation event and will fall to 7,000 feet or less on Wednesday. Minimal accumulations are expected due to the warm storm system.