503  
FXHW01 KWNH 221224  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
823 AM EDT SUN OCT 22 2017  
 
VALID 00Z MON OCT 23 2017 - 00Z MON OCT 30 2017  
   
..HEAVY RAIN THREAT LATE MONDAY THROUGH TUESDAY
 
 
EAST SOUTHEAST TRADES WILL CONTINUE TO VEER TO THE SOUTHEAST AND  
THEN SOUTH AHEAD OF AN APPROACHING COLD FRONT LATE MONDAY THROUGH  
TUESDAY FROM NW TO SE ACROSS THE ISLAND CHAIN. THIS IS IN RESPONSE  
TO A FORMING UPPER LOW NEAR 30N/160W EARLY TUESDAY THAT IS  
FORECAST TO REMAIN QUASI-STATIONARY FOR ABOUT 24 HOURS AND THEN  
LIFT TO THE NORTHEAST ON WEDNESDAY. DEEP TROPICAL MOISTURE SHOULD  
BE DRAWN NORTHWARD AHEAD OF THE FRONT INTO THE REGION ON TUESDAY  
-- PRECIPITABLE WATER VALUES RISING TO NEAR 2 INCHES OR +2 TO +4  
STANDARD DEVIATIONS -- WHICH SUPPORTS A HEAVY RAIN THREAT FOR AT  
LEAST 24 HOURS. THE CONSENSUS TAKES THE FRONT JUST EAST OF THE BIG  
ISLAND LATE WEDNESDAY INTO THURSDAY, BRINGING IN COOLER AND MUCH  
DRIER AIR ON NW FLOW TO THE STATE. FOR NEXT FRI-SUN, WINDS WILL  
CONTINUE TO VEER TO THE N THEN NE AND EVENTUALLY ENE BY THE END OF  
NEXT WEEKEND BUT REMAIN RATHER BREEZY.  
 
FRACASSO  
 

 
 
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