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: 811 PM PDT WED AUG 20 2014

View Nearby Observations

Waters from San Mateo point to the Mexican Border Extending 30 to 60 nm out including San Clemente Island

Marine Zone Forecast





  • SynopsisAT 7 PM... A 1013 MB HIGH WAS 100 NM SOUTH OF SAN DIEGO...AND A 1005 MB LOW WAS NEAR NEEDLES. WEAK TO MODERATE ONSHORE FLOW WILL PREVAIL THROUGH MONDAY.
  • Rest Of Tonight Wind NW 10 kt in the evening... Becoming variable less than 10 kt. Wind waves 2 ft or less. Mixed swell W 1 to 2 ft at 9 seconds and S 3 to 4 ft at 12 seconds.
  • Thu Wind variable less than 10 kt...becoming W 10 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 1 to 2 ft at 10 seconds and S 4 ft at 12 seconds.
  • Thu Night Wind NW 10 kt. Gusts to 15 kt in the evening. Wind waves 2 ft or less. Mixed swell W 1 ft at 11 seconds and S 4 ft at 12 seconds.
  • Fri Wind variable less than 10 kt...becoming NW 10 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 1 to 2 ft at 11 seconds and S 4 to 5 ft at 12 seconds.
  • Fri Night Wind NW 10 kt with gusts to 15 kt in the evening... Becoming variable less than 10 kt. Wind waves 3 ft in the evening...becoming 2 ft or less. Mixed swell W 1 to 2 ft at 10 seconds and S 5 ft at 12 seconds.
  • Sat Wind variable less than 10 kt. Wind waves 2 ft or less. Mixed swell W 1 to 2 ft and S 5 ft.
  • Sat Night Wind NW 10 kt. Wind waves 2 ft or less. Mixed swell W 1 ft and S 5 ft.
  • Sun Wind variable less than 10 kt. Wind waves 2 ft or less. Mixed swell W 1 ft and SW 4 ft.
  • Sun Night Wind NW 10 kt with gusts to 15 kt. Wind waves 3 ft in the evening...becoming 2 ft or less. Mixed swell W 1 ft and SW 4 ft.
  • Mon Wind NW 10 kt. Wind waves 2 ft or less. Mixed swell W 1 ft and SW 5 ft.
  • Mon Night Wind NW 15 kt...becoming 10 kt after midnight. Gusts to 20 kt. Wind waves 3 to 4 ft in the evening...becoming 2 ft or less. Mixed swell W 1 ft and SW 5 ft.



Additional Forecasts and Information

Zone Area Forecast for Waters from San Mateo point to the Mexican Border Extending 30 to 60 nm out including San Clemente Island
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