Satellite Interpretation Message
Issued by NWS Tiyan, Guam

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ATPQ40 PGUM 191421
SIMGUM

SATELLITE INTERPRETATION MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
1221 AM CHST SUN AUG 20 2017

WESTERN NORTH PACIFIC BETWEEN THE EQUATOR AND 25N FROM 130E TO 180.

A CIRCULATION NORTHEAST OF LUZON AT 21N130E IS THE SUBJECT OF A
TROPICAL CYCLONE FORMATION ALERT ISSUED BY THE JOINT TYPHOON
WARNING CENTER. SOUTHWEST MONSOON FLOW ACROSS THE PHILIPPINE SEA
IS CAUSING CLOUDINESS WITH PATCHY SHOWERS AND THUNDERSTORMS WEST
OF THE MARIANA ISLANDS AND OVER KOROR AND YAP WEST OF A LINE FROM
25N132E TO 12N144E TO 4N130E. FOR MORE INFORMATION ON THE TCFA...
SEE BULLETINS ISSUED BY THE JTWC UNDER WMO HEADER WTPN21 PGTW.

CONVERGING EAST WINDS AND UPPER-LEVEL DIVERGENCE ARE PRODUCING
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS OVER THE NORTHERN
MARIANA ISLANDS WITHIN 150 MILES OF A LINE FROM 17N144E TO 10N150E
AND FARTHER NORTHEAST WITHIN 80 MILES OF A LINE FROM 17N150E TO
18N156E.

ANOTHER TROPICAL DISTURBANCE IS CENTERED NEAR POHNPEI AT 7N160E.
CLOUDINESS WITH PATCHY SHOWERS AND THUNDERSTORMS OVER NORTHERN
CHUUK AND POHNPEI STATES IS BETWEEN 12N AND 7N FROM 150E TO 160E.

TRADE-WIND CONVERGENCE IS TRIGGERING SCATTERED SHOWERS AND A FEW
THUNDERSTORMS FROM MAJURO TO THE DATE LINE EAST OF A LINE FROM
9N170E TO 4N173E. PATCHY SHOWERS ARE ALSO OVER KOSRAE STATE.

$$

SIMPSON



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