Updated Saturday, 5:45 a.m.:
As of 5 a.m. Saturday, the 24-hour rainfall total at the Napa County Airport was .94 inches, according to the National Weather Service.
After a brief reprieve Thursday, the rain has returned in earnest, causing skiers to cast their eyes joyfully toward the snowy Sierra while valley-floor residents glance anxiously at the water levels in their local creeks and rivers.
The National Weather Service precipitation map for Napa County indicated that in the 24 hours ending at noon Friday, .5 inches fell at the Napa County Airport.
The NWS recorded .56 inches at the Yountville Cross Road.
At higher elevations: Atlas Peak received .96 inches, Angwin received 1.32 inches, St. Helena received 1.48 inches and 1.76 inches of rain fell on Mount St. Helena, according to the NWS.
Rain is expected to be heavy throughout Friday and overnight with smaller storms predicted throughout the weekend, according to the NWS, which issued a Hazardous Weather Advisory warning that "small streams and creeks will see significant rises and could possibly reach bankfull."
For information on how to access current measurements of river, creek and stream levels, please see .
For 24-hour rainfall reports from the NWS, please see http://www.wrh.noaa.gov/mtr/rainfall.php
Do you subscribe to the Napa Patch newsletter? It brings our latest stories, blogs, announcements and the day's calendar events to your in-box early each morning. If you haven't signed up yet, you can do so by clicking here.