National Weather Service United States Department of Commerce

Oppressive heat and humidity building into the central and southeast U.S.

A heat wave is building into parts of the central and southeast U.S. this week. The combination of heat and humidity will lead to dangerous heat indices, especially in parts of the central Mississippi River Valley where an Excessive Heat Warning is in effect. Heat Advisories are in effect elsewhere across the region. Relief is not expected for several days.
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18NM N San Francisco CA

Marine Point Forecast [NOTICE]

Tonight

Patchy Fog

SSW 7kt

Thursday

Patchy Fog

Winds IncreasingS 16kt

Thursday
Night

Partly Cloudy

SW 10ktWinds Decreasing

Friday

Patchy Fog

S 14kt

Friday
Night

Mostly Clear

WSW 11kt

Saturday

Sunny

Light Wind

Saturday
Night

Mostly Clear

SW 9kt

Sunday

Sunny

Light Wind

Sunday
Night

Mostly Clear

SW 9kt

Associated Zone Forecast which includes this point

Last Update: 7:09 pm PDT Aug 20, 2014
Forecast Valid: 8pm PDT Aug 20, 2014-6pm PDT Aug 27, 2014

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Detailed Forecast



  • SynopsisMODERATE NORTHWESTERLY WINDS EXPECTED ACROSS THE NORTHERN OUTER WATERS TONIGHT AND OVER PORTIONS OF SAN FRANCISCO BAY THIS AFTERNOON. OTHERWISE GENERALLY LIGHT WINDS AND SEAS WILL CONTINUE. A MODERATE PERIOD SOUTH SWELL WILL MOVE INTO THE REGION LATER THIS WEEK DUE TO STORMS IN THE TROPICAL PACIFIC.
  • Tonight SSW wind around 7 kt. Patchy fog after 11pm.
  • Thursday Variable winds less than 5 kt becoming S 11 to 16 kt in the afternoon. Patchy fog before 11am.
  • Thursday Night SW wind 5 to 10 kt becoming variable and less than 5 kt. Partly cloudy.
  • Friday S wind 9 to 14 kt. Patchy fog before 11am.
  • Friday Night WSW wind 5 to 11 kt. Mostly clear.
  • Saturday Variable winds 5 kt or less. Sunny.
  • Saturday Night SW wind 5 to 9 kt. Mostly clear.
  • Sunday Variable winds 5 kt or less. Sunny.
  • Sunday Night SW wind 6 to 9 kt. Mostly clear.
*Notices:
  1. This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
  2. The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.