118  
FXHW01 KWNH 241220  
PMDHI  
 
HAWAII EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
820 AM EDT TUE OCT 24 2017  
 
VALID 00Z WED OCT 25 2017 - 00Z WED NOV 01 2017  
   
..A STRONG FRONT WITH LOCALLY EXCESSIVE RAINFALL
 
 
A STRONG COLD FRONT MOVES THROUGH THE HAWAI'IAN ISLANDS TODAY TO  
BRING ADDITIONAL LOCALLY HEAVY RAINS AND GUSTY WINDS TO THE REGION  
AS A POTENT CLOSED LOW SPINS TO THE NORTH OF THE STATE.  
PRECIPITABLE WATER VALUES WILL CONTINUE TO RISE TO WELL OVER 2  
INCHES OVER THE BIG ISLAND (+2 TO +5 STANDARD DEVIATIONS) AHEAD OF  
THE FRONT WITH A DEEP TROPICAL CONNECTION TO THE ITCZ. FLASH FLOOD  
WATCHES AND WARNINGS ARE IN EFFECT OVER THE ISLANDS.  
 
THE FRONT MAY PROVE SLOW TO WORK THROUGH THE BIG ISLAND UNTIL  
LATER THIS WEEK, PROLONGING WET FLOW THERE, WITH IMPROVING  
CONDITIONS OVER THE REST OF THE STATE. ONCE THE FRONT PASSES BY TO  
THE EAST, COOLER AND MUCH DRIER AIR ON BREEZY NW TO N FLOW WILL  
INFILTRATE THE STATE. WINDS WILL CONTINUE TO VEER TO THE NE AND  
EVENTUALLY ENE BY THE END OF THE WEEKEND WITH UPPER RIDGING JUST  
TO THE WEST OF THE AREA. BY EARLY NEXT WEEK, ANOTHER FRONT (MUCH  
WEAKER) WILL APPROACH THE REGION FROM THE NW.  
 
SCHICHTEL  
 

 
 
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