097  
WHUS53 KGRR 200549  
SMWGRR  
LMZ845-846-874-876-200645-  
/O.NEW.KGRR.MA.W.0001.170320T0549Z-170320T0645Z/  
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED  
SPECIAL MARINE WARNING  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
149 AM EDT MON MAR 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 245 AM EDT.  
 
* AT 149 AM EDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE  
EXTENDING FROM PORT SHELDON HARBOR TO 18 NAUTICAL MILES WEST OF THE  
SAUGATUCK PIERHEADS...MOVING SOUTHEAST AT 70 KNOTS.  
 
HAZARD...WIND GUSTS 34 KNOTS OR GREATER AND LARGE HAIL.  
 
SOURCE...RADAR INDICATED.  
 
IMPACT...HAZARDOUS CONDITIONS ABOVE DECK IN BRIEFLY HIGHER WINDS  
AND SUDDENLY HIGHER WAVES. LARGE HAIL COULD RESULT IN  
STRUCTURAL DAMAGE.  
 
* LOCATIONS IMPACTED INCLUDE...  
THE SAUGATUCK PIERHEADS AND PORT SHELDON HARBOR.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
BOATERS SHOULD SEEK SAFE HARBOR IMMEDIATELY UNTIL THESE STORMS PASS.  
WIND GUSTS 34 KNOTS OR GREATER...LARGE HAIL...HIGH WAVES...DANGEROUS  
LIGHTNING...AND HEAVY RAIN ARE POSSIBLE WITH THESE STORMS.  
 
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 4241 8628 4265 8679 4291 8622 4270 8621  
TIME...MOT...LOC 0549Z 294DEG 70KT 4289 8616 4267 8664  
 
HAIL...>.75IN  
WIND...>34KTS  
 

 
 
WDM  
 
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