Overview
An upper level disturbance will move across the region and interact with monsoonal moisture to produce showers and the possibility of embedded thunderstorms late tonight through Tuesday afternoon. The best chance of measurable precipitation will be across the San Francisco Bay area and points northward. While the threat for thunderstorms has diminished, any lightning strikes that do occur could potentially start a fire.
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CONFIDENCE
· Moderate/Low: Moderate confidence in showers developing across the North Bay Tuesday morning. Lower confidence in thunderstorm potential.
UPDATED INFORMATION
· Updated timing and potential for thunderstorms.
TIMING
· Showers and possible thunderstorms developing after midnight tonight through Tuesday's morning commute.
· Activity should diminish late Tuesday afternoon or early evening.
LOCATIONS
· San Francisco and areas northward including Marin, Sonoma and Napa Counties.
· Light rain or sprinkles also possible as far south as the Santa Clara Valley and across the Santa Cruz Mountains.
IMPACTS
*Hazards:
· No watches/warnings/advisories in effect at this time
*Impact: Showers and Thunderstorms
· A potential for fire starts.
· Wet roadways during Tuesday's morning commute across the San Francisco Bay area. Motorists are advised to drive with extra caution, slow down and allow extra time to reach their destinations.
· Clogged storm drains may be overwhelmed during moderate rainfall resulting in brief ponding on the roadways.
*Impact: Rainfall
· Generally less than 0.05" north of the Golden Gate Bridge.
· Isolated locations may receive as much as 0.20" in the higher elevations across the North Bay.
NWS will continue to provide updates if the forecast changes.
