Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Hazardous Weather Conditions

Coastal Flood Advisory until June 18, 05:00 AM PDT

Current conditions at

Napa, Napa County Airport (KAPC)

Lat: 38.2075°NLon: 122.27944°WElev: 33.0ft.

Overcast

59°F

15°C

Humidity	83%
Wind Speed	W 14 MPH
Barometer	29.89 in (1012.19 mb)
Dewpoint	54°F (12°C)
Visibility	10.00 mi
Last update	18 Jun 01:54 AM PDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles E Saint Helena CA

Coastal Flood Advisory June 18, 02:04am until June 18, 05:00am

Click here for hazard details and duration

Coastal Flood Advisory

Coastal Flood Advisory June 18, 02:04am until June 18, 05:00am
NOW until 5:00am Thu
Coastal Flood Advisory
Overnight
Low: 54 °F
Patchy Fog
Thursday
High: 79 °F
Areas Fog
then Sunny
Thursday Night
Low: 52 °F
Mostly Clear
then Patchy
Fog
Juneteenth
High: 72 °F
Patchy Fog
then Sunny
Friday Night
Low: 50 °F
Mostly Clear
then Patchy
Fog
Saturday
High: 77 °F
Areas Fog
then Sunny
Saturday Night
Low: 50 °F
Clear then
Patchy Fog
Sunday
High: 86 °F
Areas Fog
then Sunny

Detailed Forecast

Overnight

Patchy fog. Otherwise, mostly cloudy, with a steady temperature around 54. Calm wind.

Thursday

Areas of fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 79. Calm wind becoming southwest 5 to 8 mph in the afternoon.

Thursday Night

Patchy fog after 2am. Otherwise, increasing clouds, with a low around 52. West southwest wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 18 mph.

Juneteenth

Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 72. Calm wind becoming southwest 5 to 7 mph in the afternoon.

Friday Night

Patchy fog after midnight. Otherwise, partly cloudy, with a low around 50. West southwest wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 21 mph.

Saturday

Areas of fog before 8am. Otherwise, sunny, with a high near 77.

Saturday Night

Patchy fog after midnight. Otherwise, mostly clear, with a low around 50.

Sunday

Areas of fog before 8am. Otherwise, sunny, with a high near 86.

Sunday Night

Widespread fog, mainly after 3am. Otherwise, mostly clear, with a low around 50.

Monday

Areas of fog before 8am. Otherwise, sunny, with a high near 86.

Monday Night

Widespread fog. Otherwise, mostly clear, with a low around 51.