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Atlantic:  High Seas

GEFSWAVE Probabilistic Wave Height Guidance

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GEFSWAVE 000 Hour Wave Height less than 1ft image GEFSWAVE 006 Hour Wave Height less than 1ft image
000 Hour Wave Height less than 1ft

006 Hour Wave Height less than 1ft

GEFSWAVE 012 Hour Wave Height less than 1ft image GEFSWAVE 018 Hour Wave Height less than 1ft image
012 Hour Wave Height less than 1ft

018 Hour Wave Height less than 1ft

GEFSWAVE 024 Hour Wave Height less than 1ft image GEFSWAVE 030 Hour Wave Height less than 1ft image
024 Hour Wave Height less than 1ft

030 Hour Wave Height less than 1ft

GEFSWAVE 036 Hour Wave Height less than 1ft image GEFSWAVE 042 Hour Wave Height less than 1ft image
036 Hour Wave Height less than 1ft

042 Hour Wave Height less than 1ft

GEFSWAVE 048 Hour Wave Height less than 1ft image GEFSWAVE 054 Hour Wave Height less than 1ft image
048 Hour Wave Height less than 1ft

054 Hour Wave Height less than 1ft

GEFSWAVE 060 Hour Wave Height less than 1ft image GEFSWAVE 066 Hour Wave Height less than 1ft image
060 Hour Wave Height less than 1ft

066 Hour Wave Height less than 1ft

GEFSWAVE 072 Hour Wave Height less than 1ft image GEFSWAVE 078 Hour Wave Height less than 1ft image
072 Hour Wave Height less than 1ft

078 Hour Wave Height less than 1ft

GEFSWAVE 084 Hour Wave Height less than 1ft image GEFSWAVE 090 Hour Wave Height less than 1ft image
084 Hour Wave Height less than 1ft

090 Hour Wave Height less than 1ft

GEFSWAVE 096 Hour Wave Height less than 1ft image GEFSWAVE 102 Hour Wave Height less than 1ft image
096 Hour Wave Height less than 1ft

102 Hour Wave Height less than 1ft

GEFSWAVE 108 Hour Wave Height less than 1ft image GEFSWAVE 114 Hour Wave Height less than 1ft image
108 Hour Wave Height less than 1ft

114 Hour Wave Height less than 1ft

GEFSWAVE 120 Hour Wave Height less than 1ft image GEFSWAVE 126 Hour Wave Height less than 1ft image
120 Hour Wave Height less than 1ft

126 Hour Wave Height less than 1ft

GEFSWAVE 132 Hour Wave Height less than 1ft image GEFSWAVE 138 Hour Wave Height less than 1ft image
132 Hour Wave Height less than 1ft

138 Hour Wave Height less than 1ft

GEFSWAVE 144 Hour Wave Height less than 1ft image GEFSWAVE 150 Hour Wave Height less than 1ft image
144 Hour Wave Height less than 1ft

150 Hour Wave Height less than 1ft

GEFSWAVE 156 Hour Wave Height less than 1ft image GEFSWAVE 162 Hour Wave Height less than 1ft image
156 Hour Wave Height less than 1ft

162 Hour Wave Height less than 1ft

GEFSWAVE 168 Hour Wave Height less than 1ft image GEFSWAVE 174 Hour Wave Height less than 1ft image
168 Hour Wave Height less than 1ft

174 Hour Wave Height less than 1ft

GEFSWAVE 180 Hour Wave Height less than 1ft image GEFSWAVE 186 Hour Wave Height less than 1ft image
180 Hour Wave Height less than 1ft

186 Hour Wave Height less than 1ft

GEFSWAVE 192 Hour Wave Height less than 1ft image GEFSWAVE 198 Hour Wave Height less than 1ft image
192 Hour Wave Height less than 1ft

198 Hour Wave Height less than 1ft

GEFSWAVE 204 Hour Wave Height less than 1ft image GEFSWAVE 210 Hour Wave Height less than 1ft image
204 Hour Wave Height less than 1ft

210 Hour Wave Height less than 1ft

GEFSWAVE 216 Hour Wave Height less than 1ft image GEFSWAVE 222 Hour Wave Height less than 1ft image
216 Hour Wave Height less than 1ft

222 Hour Wave Height less than 1ft

GEFSWAVE 228 Hour Wave Height less than 1ft image GEFSWAVE 234 Hour Wave Height less than 1ft image
228 Hour Wave Height less than 1ft

234 Hour Wave Height less than 1ft

GEFSWAVE 240 Hour Wave Height less than 1ft image
240 Hour Wave Height less than 1ft



Notes on images above:

  • The likelihood of exceedance is shown as a probability of 0 to 100 of waves heights (significant wave height) reaching or being greater than the chosen value.

  • The 90th percentile represents the wave height value that 90% of the ensemble members are either less than or equal to (i.e., 18 feet).

  • The 10th percentile is the wave height value that is represented by 10% of the contributing ensemble members.

  • The mean is defined as the 50th percentile, that is, the wave height value represented reflects half the distribution is above and half is below this value.

  • The maximum value is the highest value produced by any of the 31 ensemble members. It reflects the most severe conditions predicted by the ensemble prediction system.

The data are produced from the Global Ensemble Forecast System (GEFS) which is run every 6 hours and are created with 31 ensemble members.

Additional information for interpreting this data

More information is available from NOAA's Environmental Modeling Center (EMC).