Prognostic Meteorological Discussion
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972
FXHW01 KWNH 251225
PMDHI

HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
825 AM EDT TUE JUL 25 2017

VALID 00Z WED JUL 26 2017 - 00Z WED AUG 02 2017

AN UPPER RIDGE CURRENTLY TO THE NORTHEAST OF HAWAI`I WILL CONTINUE
TO MEANDER IN PLACE AND SLOWLY WEAKEN OVER THE NEXT WEEK, BRIDGING
ACROSS THE REGION TO THE SOUTHWEST. ENSEMBLES FORECAST UPPER
TROUGHING TO REMAIN AROUND THE DATELINE AND BY NEXT WEEK
REINFORCED ALONG 170W FROM THE NORTHEAST. THIS SHOULD MAINTAIN
MODEST TRADES FOR THE REST OF THE WEEK AS THE 1031MB SURFACE HIGH
PRESSURE WEAKENS TO ABOUT 1025MB THIS WEEKEND. PRECIPITABLE WATER
VALUES ARE FORECAST TO LOWER FOR THE NEXT COUPLE OF DAYS IN THE
WAKE OF THE REMNANTS OF FERNANDA BEFORE RISING AGAIN AHEAD OF THE
FUTURE REMNANTS OF CURRENT TROPICAL STORM GREG, WHICH IS CURRENTLY
FORECAST TO SINK SOUTHWESTWARD LATER THIS WEEK TO NEAR 15N/150W
AND MOSTLY BE ABSORBED BACK INTO THE ITCZ. THE MODELS INDICATE
THAT THE REMNANTS OF GREG AND ITS ASSOCIATED MOISTURE SHOULD STAY
SOUTH OF THE REGION. THEREFORE, FOR THE NEXT WEEK, GENERALLY LIGHT
TO LOCALLY MODEST SHOWERS ARE EXPECTED THROUGH NEXT TUESDAY.
THEREAFTER, HURRICANE HILARY MAY BE APPROACHING 140W FROM THE EAST.


FRACASSO


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