National Weather Service United States Department of Commerce

Flash flooding threat continues from the Great Basin across the southern Plains

The wet pattern in place will continue from the Great Basin across the central and southern Rockies into the southern Plains into Wednesday. Ample monsoonal moisture with a frontal boundary in place will allow for shower and thunderstorm development with locally heavy rainfall at times. The heavier showers could lead to flash flooding in some areas, especially urban areas and burn scars.
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Last Update: 318 PM CHST WED JUL 30 2014

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Guam Coastal Waters

Marine Zone Forecast

...TROPICAL STORM WARNING IN EFFECT...



  • SynopsisTROPICAL STORM CONDITIONS WILL SUBSIDE THROUGH THE EVENING HOURS FOR GUAM AND ROTA. EXPECT IMPROVING CONDITIONS LATE TONIGHT AND THURSDAY AS HALONG MOVES FARTHER AWAY FROM THE MARIANAS. SEAS WILL REMAIN HAZARDOUS TO SMALL VESSELS FOR THE NEXT SEVERAL DAYS ACROSS THE MARIANAS.
  • Tonight Southwest tropical storm force winds of 30 to 40 kt with gusts to 50 kt easing to 35 kt with gusts to 45 kt after midnight. Combined seas 15 to 17 ft. Occasional showers in the evening. Isolated thunderstorms after midnight.
  • Thursday South wind 20 kt with gusts to 30 kt. Wind waves 7 to 9 ft. West swell 9 to 10 ft and east 3 ft. Isolated thunderstorms.
  • Thursday Night South wind 15 to 20 kt. Wind waves 4 to 6 ft. West swell 10 to 12 ft and east 3 ft. Isolated thunderstorms.
  • Friday South wind 10 to 15 kt. Wind waves 3 ft. West swell 9 to 11 ft and east 3 ft. Isolated thunderstorms.
  • Friday Night South wind 5 to 15 kt. Wind waves 2 ft or less. West swell 6 to 8 ft and east 3 ft. Isolated thunderstorms.
  • Saturday South wind 5 to 15 kt. Wind waves 2 ft or less. West swell 7 to 9 ft and east 3 ft.
  • Sunday South wind 5 to 15 kt. Wind waves 3 ft. West swell 6 to 8 ft and east 3 ft.
  • Monday South wind 10 to 20 kt. Wind waves 3 ft. West swell 6 to 8 ft and east 3 ft.



Additional Forecasts and Information

Zone Area Forecast for Guam Coastal Waters
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