049  
WHUS43 KGRR 290735  
CFWGRR  
 
LAKESHORE HAZARD MESSAGE  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
335 AM EDT SAT SEP 29 2018  
 
MIZ037-043-050-056-064-071-291500-  
/O.CON.KGRR.BH.S.0017.000000T0000Z-180929T1500Z/  
MASON-OCEANA-MUSKEGON-OTTAWA-ALLEGAN-VAN BUREN-  
335 AM EDT SAT SEP 29 2018  
 
...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 11 AM EDT THIS  
MORNING...  
 
* HIGH WAVE ACTION...STRONG CURRENTS AND DANGEROUS SWIMMING  
CONDITIONS EXPECTED.  
 
* STRONG STRUCTURAL CURRENTS EXPECTED.  
 
* STRONG LONGSHORE CURRENTS EXPECTED.  
 
* RIP CURRENTS EXPECTED.  
 
* LOCATION...BEACHES FROM ST. JOSEPH TO MANISTEE.  
 
* OVERVIEW/POTENTIAL IMPACTS...WAVES OF 3 TO 5 FEET CAN BE  
EXPECTED EARLY THIS MORNING, GRADUALLY SUBSIDING BY LATE MORNING.  
THE NORTH SIDES OF PIERS WILL BE MOST IMPACTED WITH THIS EVENT.  
 
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
HIGH WAVE ACTION MAKES SWIMMING DIFFICULT AND CAN TIRE EVEN A  
STRONG SWIMMER QUICKLY.  
 
STRUCTURAL CURRENTS FORM ALONG PIERS WHERE LONGSHORE CURRENTS AND  
WAVE ACTION FLOW INTO THE STRUCTURE. STRUCTURAL CURRENTS CAN  
SWEEP YOU OUT INTO DEEPER WATER ALONG THE PIER STRUCTURE.  
 
A LONGSHORE CURRENT IS A LAKE CURRENT THAT MOVES PARALLEL TO  
SHORE. LONGSHORE CURRENTS CAN BE STRONG ENOUGH TO PREVENT  
SWIMMERS FROM BEING ABLE TO KEEP THEIR FEET ON THE BOTTOM...  
MAKING IT DIFFICULT TO RETURN TO SHORE.  
 
RIP CURRENTS ARE POWERFUL CHANNELS OF WATER FLOWING QUICKLY AWAY  
FROM SHORE...WHICH OCCUR MOST OFTEN AT LOW SPOTS OR BREAKS IN  
SANDBARS. RIP CURRENTS CAN SWEEP YOU INTO DEEPER WATER.  
 

 
 

 
 
WEATHER.GOV/GRR  
 
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