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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Last Update: 504 PM PDT WED AUG 20 2014

View Nearby Observations

Waters from Cape Mendocino to Pt. Arena CA from 10 to 60 nm

Marine Zone Forecast

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY AFTERNOON...



  • SynopsisMODERATE TO STRONG WILL NORTHERLY WINDS WILL PERSIST ACROSS THE COASTAL WATERS INTO THE WEEKEND AS HIGH PRESSURE NOSES IN FROM THE WEST AGAINST LOW PRESSURE INLAND. STEEP NORTHERLY WAVES WILL BUILD AS A RESULT. A LONG PERIOD SOUTHERLY WAVE WILL CONTINUE INTO NEXT WEEK.
  • Tonight N winds 20 to 25 kt. Gusts up to 30 kt. Waves building to NW 9 ft at 9 seconds.
  • Thu N winds 20 to 25 kt. Gusts up to 30 kt. Waves NW 9 ft at 8 seconds...and SW 2 ft at 13 seconds.
  • Thu Night N winds 15 to 20 kt. Waves NW 7 ft at 7 seconds... And S 3 ft at 12 seconds.
  • Fri N winds 15 to 20 kt. Waves NW 8 ft at 8 seconds...and S 3 ft at 14 seconds.
  • Fri Night N winds 20 to 25 kt with gusts to 30 kt. Waves NW 9 ft at 9 seconds...and S 3 ft at 14 seconds.
  • Sat N winds 15 to 25 kt. Waves NW 9 ft at 9 seconds...and S 3 ft at 14 seconds.
  • Sun N winds 10 to 20 kt. Waves NW 8 ft at 9 seconds...and S 4 ft at 13 seconds.
  • Mon N winds 15 to 20 kt. Waves NW 8 ft at 8 seconds...and SW 3 ft at 14 seconds.



Additional Forecasts and Information

Zone Area Forecast for Waters from Cape Mendocino to Pt. Arena CA from 10 to 60 nm
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