Marine Interpretation Message
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000 AGNT40 KWNM 210721 MIMATN Marine Weather Discussion for N Atlantic Ocean NWS Ocean Prediction Center Washington DC 321 AM EDT Mon Aug 21 2017 .FORECAST DISCUSSION...Major features/winds/seas/significant .weather for the North Atlantic Ocean W of 50W from 30N to 50N. Summary...The 00z ncep surface analysis shows a low pres trough passing just E of the Gulf of Maine and Georges Bank, with a stationary front extending NE to SW over the central and southern nt2 wtrs. The analysis also shows a high pres ridge over the southern nt2 waters S of the front. Latest available ascat hi-res and ascat passes from a few hours ago show 5 to 15 kt winds over the offshore waters, except for 15 to 20 kt winds across the NE part of the nt2 area. Lightning density product data at 0650z shows a few isolated showers and tstms over the southern nt2 waters. Models...The 00z medium range models are in good overall agreement across the offshore waters during the forecast period, except the 00z ukmet brings a fairly strong tropical low N and NE over the nt2 waters on Fri and Fri night. 00z ecmwf/gfs/gem have a frontal boundary oriented NE to SW across the nt2 area from Thu night through Fri night with some weak lows moving NE along the front. Also, the latest WPC medium range forecaster guidance supports the 00z ecmwf/gfs/gem prognosis. Overall it looks like the 00z ecmwf and 00z gfs 10m solutions are in the best agreement, so for now a representative 50/50 blend of the 00z ecmwf/gfs will be used for the wind grids through the forecast period. Seas...The 00z wna wavewatch and 00z ecmwf wam both initialized well over the offshore waters, and are in good overall agreement through the forecast period with only minor differences noted. A 50/50 blend of the 00z wna wavewatch/ecmwf wam will be used for the sea height grids over the entire forecast period in order to smooth out the model differences. .Extratropical Storm Surge Guidance...N/A. .WARNINGS...Preliminary. .NT1 New England Waters... None. .NT2 Mid-Atlantic Waters... None. $$ .Forecaster Scovil. Ocean Prediction Center.

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