285  
WHUS53 KGRR 200830  
SMWGRR  
LMZ845-846-874-876-200915-  
/O.NEW.KGRR.MA.W.0005.170420T0830Z-170420T0915Z/  
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED  
SPECIAL MARINE WARNING  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
430 AM EDT THU APR 20 2017  
 
THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A  
 
* SPECIAL MARINE WARNING FOR...  
NEARSHORE AND OPEN WATERS FROM SOUTH HAVEN TO GRAND HAVEN MI...  
 
* UNTIL 515 AM EDT.  
 
* AT 430 AM EDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE  
EXTENDING FROM THE MONA LAKE CHANNEL TO 27 NAUTICAL MILES WEST OF  
THE SOUTH HAVEN PIERHEADS...MOVING EAST AT 40 KNOTS.  
 
HAZARD...WIND GUSTS 34 KNOTS OR GREATER AND SMALL HAIL.  
 
SOURCE...RADAR INDICATED.  
 
IMPACT...HAZARDOUS CONDITIONS ABOVE DECK IN BRIEFLY HIGHER WINDS  
AND SUDDENLY HIGHER WAVES.  
 
* LOCATIONS IMPACTED INCLUDE...  
THE GRAND HAVEN PIERHEADS...PORT SHELDON HARBOR...THE SAUGATUCK  
PIERHEADS AND THE HOLLAND PIERHEADS.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES.  
 

 
 
LAT...LON 4241 8628 4244 8636 4246 8700 4247 8700  
4306 8651 4306 8625 4294 8622 4270 8621  
TIME...MOT...LOC 0829Z 263DEG 40KT 4314 8638 4249 8690  
 
HAIL...<.75IN  
WIND...>34KTS  
 

 
 
CAS  
 
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