Forecast Discussion

DISCUSSION…
THE ISLANDS ARE WELL WITHIN THE TYPICAL SUMMERTIME TRADE WIND BELT…
WITH LOCAL WINDS A LITTLE LIGHTER DUE TO THE PASSAGE OF A LOW…AND
IT/S ASSOCIATED FRONT…WELL N OF THE ISLANDS. OVERNIGHT ASCAT PASS
SHOWED WINDS OVER NEARBY OPEN WATERS WERE AROUND 15 MPH…AS THE
LOCAL GRADIENT REMAINS LOOSENED BY THE COMBINATION OF THE PASSING
FRONT AND A SLOWLY DIMINISHING N-S ORIENTED LOW LEVEL TROUGH N OF
KAUAI AND OAHU. OVERNIGHT SOUNDINGS SHOWED A STABLE AIR MASS IN
PLACE…WITH THE LOW LEVELS STRONGLY CAPPED BY A TEMPERATURE
INVERSION BASED BETWEEN 7 AND 8 KFT. SATELLITE AND RADAR REVEAL
RANDOM PATCHES OF LOW CLOUDS PASSING OVER THE ISLANDS…BRINGING
SOME SHOWERS TO WINDWARD AREAS.

THROUGH TUESDAY…HIGH PRESSURE TO THE DISTANT NNW WILL TRACK
RAPIDLY SE…AS THE TROUGH N OF THE ISLANDS TRACKS W AND THE FRONT
TO THE N DISSIPATES. THIS WILL ALLOW THE LOCAL PRESSURE GRADIENT TO
SLOWLY TIGHTEN…WITH TRADE WIND SPEEDS GRADUALLY INCREASING.
HOWEVER…WINDS MAY BE LIGHT ENOUGH TODAY TO ALLOW LEEWARD SEA
BREEZES TO BRING SOME CLOUDS AND ISOLATED SHOWERS OVER LEEWARD
SLOPES AND COASTS THIS AFTERNOON.

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