Full Notification

Showers and Thunderstorms Possible Wednesday Night Through Friday for Los Angeles, Ventura, Santa Barbara, and San Luis Obispo Counties...
MAIN IMPACTS
•Generally light showers (0.01-0.10 inch per hour) but isolated moderate to heavy rain (up to 0.50 inch per hours) possible under any thunderstorms.
•Minor mud and debris flows possible if a thunderstorm forms over a recent burn area
•Showers and small hail could impact metro areas during commuting hours
•Snow levels 5,500 to 6,500 feet
•Dangerous lightning and possible waterspouts over the coastal waters
FORECAST CONFIDENCE
Medium confidence in overall scenario, but low confidence in rain amounts and intensity as well as debris flow potential.

SYNOPSIS
A cold low pressure system will drop into California from the Pacific Northwest on Thursday then slowly move into Arizona by late Friday night. This will initially lift the marine layer Wednesday night into Thursday which could produce drizzle or light showers. Cold and very unstable air will move into San Luis Obispo and Santa Barbara Counties around noon on Thursday, then move into Ventura and Los Angeles Counties later that afternoon and evening. While moisture will be limited, we rarely see air this unstable. There is a widespread slight chance of thunderstorms as a result with possible hail. The low amount moisture adds the most amount of uncertainty with this system, and could be the limiting factor. Showers could linger into Friday, but any thunderstorm chances should become confined to the mountains.
NWS will continue to provide email updates if the forecast changes or check our website at weather.gov/losangeles
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