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5am Ignacio Update

todayAugust 28, 2015

Background

The tracking cone shows a very slight North turn, good news, and hopefully, continues to track further & further North & East of The Islands. The important thing to always remember is the path continues to change and even a very small change can be extremely significant. (Hurricane Jimena, an even more powerful hurricane is still far away with much uncertainty, although it’s path has just been moved more westerly, rather than straight north, which may bring it closer to our Islands, but it is still more than a week away. It is intensifying quickly and become a major hurricane , cat 4, with 140+mph winds)

Stay tuned to KNKR, 96.1fm for continuous updates and knkr.org.

EP122015W.014

OVERALL SATELLITE PRESENTATION FOR IGNACIO HAS CHANGED LITTLE 
OVERNIGHT...WITH AN OBLONG 180 NM WIDE CDO HIDING THE LLCC. A VERY 
COLD MINUS 90 DEGREE CELSIUS CONVECTIVE TOP POPPED UP JUST SOUTH OF 
THE SUSPECTED CENTER WITHIN THE PAST FEW HOURS...WHILE THE FIRST 
GOOD HINT AT A CONSISTENT WARM SPOT IS NOTED BEGINNING WITH 1300 UTC 
IMAGERY. AN 1130 UTC AMSU PASS ADDS CONFIDENCE TO THE 1200 UTC 
POSITIONAL FIX. SUBJECTIVE DVORAK SATELLITE INTENSITY ESTIMATES 
RANGED ONCE AGAIN FROM 4.5...77 KT...FROM SAB TO 5.0...90 KT FROM 
JTWC AND PHFO. UW-CIMSS ADT SHOWS AN UNCHANGING 80 KT AND...GIVEN 
THE ALMOST STEADY STATE SATELLITE PRESENTATION...WE WILL MAKE 80 KT 
OUR INITIAL INTENSITY FOR THIS ADVISORY.

IGNACIO CONTINUES TO SLIDE WEST NORTHWESTWARD ALONG THE SOUTHEAST 
FLANK OF A WEAKENING SUBTROPICAL RIDGE. INITIAL MOTION FOR THIS 
ADVISORY IS SET AT 290/09 KT...INDICATING A SLIGHT DECREASE IN 
FORWARD SPEED OVER THE PAST 12 HOURS. TRACK GUIDANCE REMAINS TIGHTLY 
PACKED...GENERALLY SHOWING A CONTINUED MOTION INITIALLY TOWARD THE 
WEST NORTHWEST...THEN NORTHWEST...THROUGH THE FIVE DAY FORECAST 
PERIOD. GFS SHIFTED SLIGHTLY TO THE LEFT AT 120 HOURS AND 
BEYOND...BUT WAS NEARLY UNCHANGED ELSEWHERE ALONG THE TRACK. 
CONSENSUS GUIDANCE IS ALSO ALMOST UNCHANGED SINCE THE LAST ECMWF RUN 
WAS AT 0000 UTC. IN CONTRAST...HWRF AND GFDL CONTINUE SHIFTING 
NOTICEABLY TO THE RIGHT...WITH HWRF NOW TURNING IGNACIO SHARPLY 
NORTHWARD BEYOND 72 HOURS. THE FORECAST TRACK FOR THIS ADVISORY IS 
UNCHANGED FROM THE PREVIOUS ONE...FOLLOWING THE CONSENSUS ARC BUT 
REMAINING ON THE LEFT EDGE OF THE GUIDANCE ENVELOPE. 

SHIPS GUIDANCE SHOWS THE WINDOW FOR SYSTEM INTENSIFICATION CLOSING 
AFTER 36 HOURS...WITH SLIGHTLY COOLER SSTS AND INCREASING SHEAR 
TAKING A STEADY TOLL ON INTENSITY AFTER 48 HOURS. THAT 
SAID...IGNACIO IS IN A FRIENDLY ENVIRONMENT RIGHT NOW...WITH LOW 
SHEAR AND SSTS ABOVE 28 DEGREES CELSIUS. FOLLOWING THE SHIPS 
GUIDANCE TREND...IGNACIO IS FORECAST TO SLOWLY STRENGTHEN TO 95 KT 
AT 36 HOURS...MAINTAIN THAT STRENGTH THROUGH 48 HOURS...THEN 
STEADILY WEAKEN THROUGH THE REST OF THE FORECAST PERIOD. TO STAY IN 
LINE WITH SHIPS...THE RATE OF WEAKENING WAS DECREASED SLIGHTLY FOR 
THIS ADVISORY...KEEPING IGNACIO AT 70 KT AT 120 HOURS. THIS TREND 
ALSO CLOSELY FOLLOWS HWRF...BUT IS WEAKER THAN GFDL. THE FORECAST 
HAS THE CENTER OF IGNACIO PASSING CLOSE TO...BUT JUST NORTHEAST 
OF...THE MAIN HAWAIIAN ISLANDS AS A HURRICANE EARLY NEXT WEEK.
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  28/1500Z 14.1N 143.8W   80 KT  90 MPH
 12H  29/0000Z 14.7N 145.1W   85 KT 100 MPH
 24H  29/1200Z 15.6N 146.7W   90 KT 105 MPH
 36H  30/0000Z 16.5N 148.1W   95 KT 110 MPH
 48H  30/1200Z 17.3N 149.5W   90 KT 105 MPH
 72H  31/1200Z 19.2N 152.2W   80 KT  90 MPH
 96H  01/1200Z 21.2N 154.7W   75 KT  85 MPH
120H  02/1200Z 23.3N 157.1W   70 KT  80 MPH

 

 

Written by: KNKR News