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Sender: WX-TROPL Tropical Storm and Hurricane WX products <[email-masked]>
From:	SIU Weather Processor <[email-masked]>
Subject:      Pacific-NW: Subj/tropical Cyclone Formation Alert 230955z Jul
97// [231000]
To:	Multiple recipients of list WX-TROPL <[email-masked]>
X-Status:
X-UID: 128
Status: O
X-Mozilla-Status: 8001

480
WTPN21 PGTW 231000
SUBJ/TROPICAL CYCLONE FORMATION ALERT 230955Z JUL 97//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS
POSSIBLE WITHIN 120 NM EITHER SIDE OF A LINE FROM 7.0N7
148.4E7 TO 7.6N3 142.7E4 WITHIN THE NEXT 12 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 15 TO 20 KNOTS. METSAT IMAGERY AT
230530Z3 INDICATES THAT A CIRCULATION CENTER IS LOCATED
NEAR 7.0N7 147.4E6. THE SYSTEM IS MOVING WESTWARD AT 03
KNOTS.
2. REMARKS:
A TROPICAL DISTURBANCE HAS FORMED AND IS BECOMING BETTER
ORGANIZED IN THE CAROLINE ISLANDS. ANIMATED VISIBLE
SATELLITE IMAGERY INDICATES THAT AREAL COVERAGE OF
CONVECTION WITH THIS SYSTEM HAS INCREASED DURING THE DAY
AND CONVECTIVE BANDING FEATURES HAVE FORMED AS WELL.
WATER VAPOR SATELLITE IMAGERY SHOWS THAT OUTFLOW HAS
IMPROVED MARKEDLY ABOVE THIS SYSTEM DURING THE PAST 12
HOURS. SURFACE SYNOPTIC REPORTS FROM THE CAROLINES SHOW
THAT PRESSURES HAVE BEGUN TO FALL IN THE VICINITY OF THIS
DISTURBANCE. STEERING FLOW NEAR THIS SYSTEM IS EXPECTED
TO REMAIN WEAK DURING THE NEXT 24 HOURS; CONSEQUENTLY, A
SLOW WESTWARD DRIFT IS ANTICIPATED DURING THAT TIME.
3. THIS ALERT VALID UNTIL 241000Z7.//

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