287  
WTNT32 KNHC 152041  
TCPAT2  
 
BULLETIN  
HURRICANE OPHELIA ADVISORY NUMBER 27  
NWS NATIONAL HURRICANE CENTER MIAMI FL AL172017  
500 PM AST SUN OCT 15 2017  
 
...OPHELIA STILL A HURRICANE BUT EXPECTED TO BECOME A POWERFUL  
POST-TROPICAL CYCLONE TONIGHT...  
 
SUMMARY OF 500 PM AST...2100 UTC...INFORMATION  
----------------------------------------------  
LOCATION...44.6N 13.3W  
ABOUT 840 MI...1355 KM NE OF THE AZORES  
ABOUT 505 MI...810 KM SSW OF MIZEN HEAD IRELAND  
MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H  
PRESENT MOVEMENT...NNE OR 25 DEGREES AT 38 MPH...61 KM/H  
MINIMUM CENTRAL PRESSURE...971 MB...28.68 INCHES  
 
WATCHES AND WARNINGS  
--------------------  
THERE ARE NO COASTAL TROPICAL CYCLONE WATCHES OR WARNINGS IN EFFECT.  
 
INTERESTS IN IRELAND SHOULD MONITOR PRODUCTS ISSUED BY MET EIREANN,  
AND INTERESTS IN THE UNITED KINGDOM SHOULD MONITOR PRODUCTS ISSUED  
BY THE UK MET OFFICE.  
 
DISCUSSION AND 48-HOUR OUTLOOK  
------------------------------  
AT 500 PM AST (2100 UTC), THE CENTER OF HURRICANE OPHELIA WAS  
LOCATED NEAR LATITUDE 44.6 NORTH, LONGITUDE 13.3 WEST. OPHELIA IS  
MOVING TOWARD THE NORTH-NORTHEAST NEAR 38 MPH (61 KM/H), AND THIS  
GENERAL MOTION IS EXPECTED TO CONTINUE THROUGH MONDAY. ON THE  
FORECAST TRACK, THE CENTER OF OPHELIA WILL CROSS OVER IRELAND ON  
MONDAY, HOWEVER STRONG WINDS AND RAIN WILL EXTEND FAR FROM THE  
CENTER.  
 
MAXIMUM SUSTAINED WINDS ARE NEAR 85 MPH (140 KM/H) WITH HIGHER  
GUSTS. OPHELIA IS EXPECTED TO BE A HURRICANE-FORCE POST-TROPICAL  
CYCLONE WHEN IT NEARS THE COAST OF IRELAND ON MONDAY.  
 
HURRICANE-FORCE WINDS EXTEND OUTWARD UP TO 60 MILES (95 KM) FROM THE  
CENTER AND TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 255 MILES  
(405 KM).  
 
THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 971 MB (28.68 INCHES).  
 
HAZARDS AFFECTING LAND  
----------------------  
WIND: GALE-FORCE WINDS ARE EXPECTED TO BEGIN ACROSS SOUTHERN  
IRELAND BY EARLY MONDAY MORNING AND GRADUALLY SPREAD NORTHWARD  
ACROSS THE COUNTRY DURING THE DAY. HURRICANE-FORCE WINDS ARE  
EXPECTED TO REACH THE SOUTHERN PORTIONS OF IRELAND BY MONDAY  
AFTERNOON. STRONG WINDS WILL THEN SPREAD INLAND ACROSS THE  
IRELAND AND PARTS OF THE UK INTO MONDAY NIGHT. PREPARATIONS TO  
PROTECT LIVES AND PROPERTY SHOULD BE NEARING COMPLETION.  
 
WIND SPEEDS ATOP AND ON THE WINDWARD SIDES OF HILLS AND MOUNTAINS  
ARE OFTEN UP TO 30 PERCENT STRONGER THAN THE NEAR-SURFACE WINDS  
INDICATED IN THIS ADVISORY, AND IN SOME ELEVATED LOCATIONS COULD BE  
EVEN GREATER.  
 
RAINFALL: OPHELIA IS EXPECTED TO PRODUCE RAINFALL AMOUNTS OF 2 TO  
3 INCHES (50 MM TO 75 MM) WITH ISOLATED TOTALS NEAR 4 INCHES (100  
MM) THROUGH TUESDAY ACROSS WESTERN IRELAND AND SCOTLAND. ACROSS  
EASTERN IRELAND, RAINFALL AMOUNTS WILL AVERAGE AROUND 1 INCH (25 MM)  
OR LESS.  
 
STORM SURGE: A DANGEROUS STORM SURGE IS EXPECTED TO PRODUCE  
SIGNIFICANT COASTAL FLOODING NEAR AND TO THE EAST OF WHERE THE  
CENTER OF THE POST-TROPICAL CYCLONE MAKES LANDFALL. NEAR THE COAST,  
THE SURGE WILL BE ACCOMPANIED BY LARGE AND DESTRUCTIVE WAVES.  
 
NEXT ADVISORY  
-------------  
NEXT COMPLETE ADVISORY AT 1100 PM AST.  
 

 
FORECASTER ZELINSKY  
 
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