SUMMARY OF 500 AM HST...1500 UTC...INFORMATION
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LOCATION...17.3N 151.7W
ABOUT 280 MI...445 KM SE OF HILO HAWAII
ABOUT 490 MI...785 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...NW OR 315 DEGREES AT 7 MPH...11 KM/H
MINIMUM CENTRAL PRESSURE...997 MB...29.44 INCHES
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
A TROPICAL STORM WATCH IS IN EFFECT FOR...
* HAWAII COUNTY
A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS OF THE
INITIAL ISSUANCE.
INTERESTS ELSEWHERE IN THE MAIN HAWAIIAN ISLANDS SHOULD MONITOR THE
PROGRESS OF TROPICAL STORM NIALA.
FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR
PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN
HONOLULU HAWAII.
DISCUSSION AND 48-HOUR OUTLOOK
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AT 500 AM HST...1500 UTC...THE CENTER OF TROPICAL STORM NIALA WAS
LOCATED NEAR LATITUDE 17.3 NORTH...LONGITUDE 151.7 WEST. NIALA IS
MOVING TOWARD THE NORTHWEST NEAR 7 MPH...11 KM/H. A TURN TOWARD THE
WEST AND A SLOWING OF THE FORWARD MOTION IS EXPECTED TO OCCUR THIS
WEEKEND. ON THE FORECAST TRACK...THE CENTER OF NIALA WILL PASS 100
TO 150 MILES SOUTH OF THE BIG ISLAND SUNDAY NIGHT.
MAXIMUM SUSTAINED WINDS ARE NEAR 60 MPH...95 KM/H...WITH HIGHER
GUSTS. SLOW WEAKENING IS EXPECTED OVER THE NEXT COUPLE OF DAYS.
TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 90 MILES...150 KM
FROM THE CENTER. REMEMBER THAT DAMAGING EFFECTS FROM TROPICAL
CYCLONES CAN EXTEND WELL AWAY FROM THE CENTER.
THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 997 MB...29.44 INCHES.
INCREASING WESTERLY SHEAR IS HAVING AN IMPACT ON NIALA. UPPER LEVEL
OUTFLOW IS VIRTUALLY NONEXISTENT TO THE NORTHWEST OF THE CYCLONE...
AND THE LOW LEVEL CIRCULATION CENTER IS BECOMING MORE DIFFICULT TO
LOCATED IN CONVENTIONAL SATELLITE IMAGERY. HOWEVER...A HELPFUL 0403
UTC SSMIS PASS SHOWED THAT DESPITE THE DEGRADED OVERALL
PRESENTATION...THE CENTRAL CORE REMAINS LARGELY INTACT FOR THE TIME
BEING WITH DEEP CONVECTION STILL WRAPPING AROUND THE SUSPECTED LOW
LEVEL CENTER. THE SATELLITE INTENSITY ESTIMATES WERE A UNANIMOUS 3.0
AND SO THE ADVISORY INTENSITY IS BEING KEPT AT 45 KT.
