Dropped dramatically since the 6 p.m. report of 29.50 and 26.6 waves:
Conditions at 41002 as of
(9:00 pm EDT on 09/17/2003)
0100 GMT on 09/18/2003: Wind Direction (WDIR): N ( 350 deg true )
Wind Speed (WSPD): 46.6 kts
Wind Gust (GST): 62.2 kts
Wave Height (WVHT): 30.2 ft
Dominant Wave Period (DPD): 13 sec
Atmospheric Pressure (PRES): 29.37 in
Pressure Tendency (PTDY): -0.13 in ( Falling Rapidly )
Air Temperature (ATMP): 74.3 °F
Water Temperature (WTMP): 81.3 °F
Dew Point (DEWP): 73.4 °F
Continuous Winds TIME
(EDT) WDIR WSPD
8:50 pm N ( 352 deg ) 47.4 kts
8:40 pm N ( 355 deg ) 49.9 kts
8:30 pm N ( 356 deg ) 47.6 kts
8:20 pm N ( 355 deg ) 47.8 kts
8:10 pm N ( 358 deg ) 47.6 kts
8:00 pm N ( 5 deg ) 49.9 kts
CAPE HATTERAS BUOY -- NOW 29.37 WAVES 30.2 FT.....
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dixiebreeze
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wxman57
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Surf's Up!
Look like surf's up at Hatteras! We've been estimating 40-45 foot waves in Isabel for days. Earlier, the high waves were produced by strong winds over a short fetch (distance the wind blows across the water). Now, the winds are much less but they're blowing across hundreds of miles.
One thing that piqued my attention yesterday was when Jim Cantore suggested that 25-30 foot waves would actually raise the water level that high on the beach. A 30 foot wave will break in water about 45 feet deep (2/3 depth rule). It'll lose energy and progress to the shore, breaking several times along the way, losing more energy and height, and finally reaching the shore as whatever size wave the coastal water depth can maintain (knowing that a wave will always break when its height is 2/3 the water depth. So the only way a 25 ft wave could raise the water level 25 feet on the beach would be if there was a vertical drop off and the depth was 45+ feet.
One thing that piqued my attention yesterday was when Jim Cantore suggested that 25-30 foot waves would actually raise the water level that high on the beach. A 30 foot wave will break in water about 45 feet deep (2/3 depth rule). It'll lose energy and progress to the shore, breaking several times along the way, losing more energy and height, and finally reaching the shore as whatever size wave the coastal water depth can maintain (knowing that a wave will always break when its height is 2/3 the water depth. So the only way a 25 ft wave could raise the water level 25 feet on the beach would be if there was a vertical drop off and the depth was 45+ feet.
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Trader Ron
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