[情報] 90W TCFA
WTPN21 PGTW 082030
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
230 NM EITHER SIDE OF A LINE FROM 4.7N 156.6E TO 7.6N 148.8E WITHIN
THE NEXT 06 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY ISSUANCE OF
NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME. WINDS IN THE AREA
ARE ESTIMATED TO BE 17 TO 22 KNOTS. METSAT IMAGERY AT 082000Z
INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 5.2N 155.7E. THE
SYSTEM IS MOVING WESTWARD AT 13 KNOTS.
2. REMARKS: THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 3.8N
159.3E, IS NOW LOCATED NEAR 5.2N 155.7E, APPROXIMATELY 255 NM
EAST-SOUTHEAST OF CHUUK, FEDERATED STATE OF MICRONESIA. ANIMATED
INFRARED SATELLITE IMAGERY SHOWS RAPID DEEPENING AND CONSOLIDATING OF
THE FORMATIVE BANDS ASSOCIATED WITH THE SYSTEM. THIS IS CORROBORATED
BY A SERIES OF MICROWAVE SATELLITE IMAGES, INCLUDING A 081558Z AMSU-B
MICROWAVE THAT ALSO SHOWS A WELL-DEFINED WRAP INTO THE LOW LEVEL
CIRCULATION CENTER. UPPER-LEVEL ANALYSIS INDICATES THE SYSTEM IS 07
DEGREES TO THE SOUTHWEST OF AN ANTICYCLONE IN AN AREA OF DIVERGENCE
AND LIGHT (05-10 KNOT) VERTICAL WIND SHEAR. ADDITIONALLY, AS EVIDENT
ON ANIMATED WATER VAPOR IMAGERY, A TROPICAL UPPER TROPOSPHERIC TROUGH
TO THE NORTH IS ENHANCING POLEWARD OUTFLOW. IN ADDITION TO THE HIGHLY
FAVORABLE UPPER LEVEL ENVIRONMENT, ALONG-TRACK SEA SURFACE
TEMPERATURES, AT 28-30 DEGREES CELSIUS, ARE VERY CONDUCIVE FOR
DEVELOPMENT . MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 17 TO
22 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1006 MB.
IN VIEW OF THE IMPROVED ENVIRONMENTAL CONDITIONS, THE POTENTIAL FOR
THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24
HOURS IS HIGH.
3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY
092030Z.//
NNNN
http://tinyurl.com/7v8e4sz
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