353  
WHUS43 KGRR 170155  
CFWGRR  
 
COASTAL HAZARD MESSAGE  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
955 PM EDT WED AUG 16 2017  
 
MIZ037-043-050-056-171000-  
/O.CON.KGRR.BH.S.0014.170817T1600Z-170819T0100Z/  
MASON-OCEANA-MUSKEGON-OTTAWA-  
955 PM EDT WED AUG 16 2017  
 
...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM THURSDAY  
AFTERNOON THROUGH FRIDAY EVENING...  
 
* HIGH WAVE ACTION... STRONG CURRENTS AND DANGEROUS SWIMMING  
CONDITIONS EXPECTED.  
 
* STRONG STRUCTURAL CURRENTS EXPECTED.  
 
* STRONG LONGSHORE CURRENTS EXPECTED.  
 
* RIP CURRENTS EXPECTED.  
 
* LOCATION...BEACHES FROM HOLLAND TO MANISTEE.  
 
* BEACHES WITH PARTICULARLY DANGEROUS CONDITIONS INCLUDE...  
 
GRAND HAVEN STATE PARK... PERE MARQUETTE PARK IN MUSKEGON.  
 
* OVERVIEW/POTENTIAL IMPACTS... AFTER A NIGHT WITH LIGHT WINDS,  
THE WINDS WILL PICKUP TOWARD DAYBREAK THURSDAY. SOUTH WINDS BY  
AFTERNOON WILL BE INCREASING TO AROUND 25 KNOTS. THIS WILL  
CAUSE WAVES TO BUILD TO 3 TO 5 FEET. STRONG STRUCTURAL AND  
LONGSHORE CURRENTS WILL DEVELOP NORTH OF HOLLAND. SOUTH FACING  
SOUTH PIERS WILL BECOME PARTICULARLY DANGEROUS. AS WINDS SHIFT  
TO THE WEST LATE THURSDAY NIGHT INTO FRIDAY, RIP CURRENTS  
BECOME A HIGHER THREAT. BY THIS TIME PERIOD, WAVES OF 5 TO 8  
FEET ARE EXPECTED.  
 
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.  
 

 
 

 
 
WDM  
 
WEATHER.GOV/GRR  
 
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