803  
WHUS53 KGRR 090921  
SMWGRR  
LMZ847-872-091015-  
/O.NEW.KGRR.MA.W.0023.180809T0921Z-180809T1015Z/  
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED  
SPECIAL MARINE WARNING  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
521 AM EDT THU AUG 9 2018  
 
THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A  
 
* SPECIAL MARINE WARNING FOR...  
NEARSHORE AND OPEN WATERS FROM GRAND HAVEN TO WHITEHALL MI...  
 
* UNTIL 615 AM EDT.  
 
* AT 519 AM EDT, STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE  
EXTENDING FROM NEAR LITTLE SABLE POINT WEST TO THE MID LAKE LINE  
WEST OF WHITEHALL, MOVING SOUTH AT 35 KNOTS.  
 
HAZARD...WIND GUSTS TO 40 KNOTS AND SMALL HAIL.  
 
SOURCE...RADAR.  
 
IMPACT...SMALL CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND  
SUDDENLY HIGHER WAVES.  
 
* LOCATIONS IMPACTED INCLUDE...  
THE MUSKEGON LIGHT.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE  
EXPECTED.  
 
FREQUENT LIGHTNING IS OCCURRING WITH THESE STORMS. IF CAUGHT ON THE  
OPEN WATER STAY BELOW DECK IF POSSIBLE, KEEP AWAY FROM UNGROUNDED  
METAL OBJECTS.  
 

 
 
LAT...LON 4341 8644 4306 8625 4306 8710 4338 8714  
TIME...MOT...LOC 0919Z 352DEG 36KT 4363 8648 4346 8665 4339 8688  
 
HAIL...<.75IN  
WIND...40KTS  
 

 
 
DUKE  
 
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