979  
FXHW01 KWNH 231203  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
803 AM EDT THU MAR 23 2017  
 
VALID 00Z FRI MAR 24 2017 - 00Z FRI MAR 31 2017  
 
THE WEATHER PATTERN OVER THE HAWAII REGION WILL BE FEATURED BY  
LARGE-SCALE RIDGING CENTERED NEAR 30 DEGREES NORTH LATITUDE, WITH  
HAWAII ON THE WESTERN EDGE OF A LARGE SURFACE HIGH THROUGH THE  
ENTIRE FORECAST PERIOD. THE MODELS ALSO INDICATE THAT 500MB  
HEIGHTS SHOULD BE NEAR 588DM, WITH THE UPPER LEVEL RIDGE BUILDING  
BUILDING NORTHWARD ACROSS THE EASTERN PACIFIC BY THE MIDDLE OF  
NEXT WEEK. BOTH THE GEFS MEAN AND EC MEAN ARE IN VERY GOOD  
AGREEMENT ON THIS PATTERN, AND BOTH SUGGEST THAT ANY MAJOR STORM  
SYSTEMS SHOULD STAY WELL TO THE NORTH OF THE STATE. THE MAIN  
EFFECT OF THE ACTIVE STORM TRACK TO THE NORTH WILL BE TO DECREASE  
THE STRENGTH OF THE EASTERLY TRADE WINDS BY WEAKENING THE PRESSURE  
GRADIENT WITHIN THE RIDGE, MAINLY EARLY NEXT WEEK AS A BROAD BREAK  
IN THE RIDGE APPROACHES FROM THE WEST AND THE TRADES VEER SLIGHTLY  
TO THE EAST-SOUTHEAST. INCREASED OCEAN SWELLS FROM THESE STORM  
SYSTEMS WILL ALSO BE LIKELY, ESPECIALLY FOR THE NORTHWESTERN  
ISLANDS.  
 
D. HAMRICK  
 

 
 
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