#628 Postby Chacor » Thu Aug 04, 2011 10:24 am
JTWC 1500 discussion:
TYPHOON (TY) 11W (MUIFA), LOCATED APPROXIMATELY 100 NM SOUTH-
SOUTHEAST OF KADENA AIR BASE, JAPAN, HAS TRACKED WEST-NORTHWESTWARD
AT 06 KNOTS OVER THE PAST SIX HOURS. ANIMATED INFRARED (IR) IMAGERY
SHOWS THE EYE HAS FILLED BUT MAINTAINS TIGHTLY CURVED CONVECTIVE
BANDING WRAPPING INTO THE LOW LEVEL CIRCULATION CENTER. A 041126Z
SSMIS MICROWAVE IMAGE DEPICTS AN EYE. THE INITIAL POSITION WAS BASED
ON THE IR IMAGERY, A RADAR FIX FROM JAPAN, AND THE SSMIS IMAGE. THE
INITIAL INTENSITY WAS BASED ON PGTW, KNES, AND RJTD DVORAK ESTIMATES
RANGING FROM 80 TO 90 KNOTS. UPPER LEVEL ANALYSIS INDICATES TY 11W
MAINTAINS GOOD DIFFLUENCE ALOFT WITH A POLEWARD OUTFLOW CHANNEL TO
THE NORTHEAST AS WELL AS AN EQUATORWARD OUTFLOW CHANNEL. TY 11W IS
CURRENTLY TRACKING ALONG THE SOUTHERN PERIPHERY OF A DEEP-LAYER,
SUBTROPICAL STEERING RIDGE.
THERE ARE NO CHANGES TO THE FORECAST PHILOSOPHY.
WITHIN THE NEXT 12 HOURS, A MID-LATITUDE TROUGH CURRENTLY
LOCATED OVER THE YELLOW SEA IS EXPECTED TO WEAKEN THE STEERING RIDGE
AND BEGIN TO ALLOW TY 11W TO SLOWLY TURN MORE POLEWARD. WITH
FAVORABLE SEA SURFACE TEMPERATURES AND OUTFLOW ALOFT, THE SYSTEM IS
FORECAST TO INTENSIFY OVER THE NEXT 48 HOURS. ADDITIONALLY, OUTFLOW
INTO THE TRANSITORY MID-LATITUDE TROUGH IS EXPECTED TO IMPROVE.
BY TAU 72, TY 11W WILL BEGIN TO WEAKEN AS IT INTERACTS WITH
LAND ALONG THE EAST COAST OF CHINA, EVEN THOUGH SEA SURFACE
TEMPERATURES ARE HIGH ALONG THE COAST THROUGH TAU 96. VERTICAL WIND
SHEAR IS FORECAST TO INCREASE AT THE END OF THE FORECAST PERIOD AND
TY 11W WILL BEGIN TO DISSIPATE OVER LAND BY TAU 120. NUMERICAL MODEL
GUIDANCE IS IN FAIR AGREEMENT WITH GFS AND ECMWF AS THE EASTERN
OUTLIERS AND EGRR AS THE WESTERN OUTLIER. THIS FORECAST IS SLIGHTLY
FASTER AND TO THE RIGHT OF MODEL CONSENSUS TO ACCOUNT FOR EGRR.
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