WTPA31 PHFO 260606 TCPCP1 BULLETIN TROPICAL STORM NIALA INTERMEDIATE ADVISORY NUMBER 5A NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI CP062015 800 PM HST FRI SEP 25 2015 ...NIALA CONTINUING TO APPROACH HAWAII FROM THE SOUTHEAST... SUMMARY OF 800 PM HST...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...16.6N 150.9W ABOUT 345 MI...555 KM SE OF HILO HAWAII ABOUT 555 MI...895 KM SE OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...NW OR 320 DEGREES AT 7 MPH...11 KM/H MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES WATCHES AND WARNINGS -------------------- CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. 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. 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 ------------------------------ AT 800 PM HST...0600 UTC...THE CENTER OF TROPICAL STORM NIALA WAS LOCATED NEAR LATITUDE 16.6 NORTH...LONGITUDE 150.9 WEST. NIALA IS MOVING TOWARD THE NORTHWEST NEAR 7 MPH...11 KM/H. THIS MOTION IS EXPECTED TO CONTINUE THROUGH TONIGHT...FOLLOWED BY A TURN TOWARD THE WEST AND A SLOWING OF THE FORWARD MOTION SATURDAY AND SUNDAY. ON THE FORECAST TRACK...THE CENTER OF NIALA WILL PASS 100 TO 150 MILES SOUTH OF THE BIG ISLAND LATER SUNDAY. MAXIMUM SUSTAINED WINDS ARE NEAR 50 MPH...85 KM/H...WITH HIGHER GUSTS. SOME STRENGTHENING IS POSSIBLE THROUGH EARLY SATURDAY... FOLLOWED BY WEAKENING SATURDAY NIGHT AND SUNDAY. TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 80 MILES...130 KM FROM THE CENTER. REMEMBER THAT DAMAGING EFFECTS FROM TROPICAL CYCLONES CAN EXTEND WELL AWAY FROM THE CENTER. THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 999 MB...29.50 INCHES. HAZARDS AFFECTING LAND ---------------------- RAINFALL...STORM TOTAL RAINFALL OF 6 TO 12 INCHES...WITH ISOLATED MAXIMUM AMOUNTS TO 16 INCHES...ARE EXPECTED WITHIN THE WATCH AREA. THESE RAINFALL AMOUNTS COULD CAUSE LIFE-THREATENING FLASH FLOODS...AS WELL AS ROCKSLIDES AND MUDSLIDES. SURF...SWELLS ASSOCIATED WITH TROPICAL STORM NIALA WILL PRODUCE LARGE SURF ALONG SOUTHEAST FACING SHORES OF MAINLY THE BIG ISLAND THIS WEEKEND AND CONTINUING INTO EARLY NEXT WEEK. WIND...TROPICAL STORM CONDITIONS ARE POSSIBLE ON THE BIG ISLAND ON SUNDAY. NEXT ADVISORY ------------- NEXT COMPLETE ADVISORY...1100 PM HST. $$ FORECASTER R BALLARD