Satellite Interpretation Message
Issued by NWS Tiyan, Guam

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000
ATPQ40 PGUM 151455
SIMGUM

SATELLITE INTERPRETATION MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
1255 AM CHST SAT OCT 16 2021

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

A MONSOON TROUGH ENTERS THE REGION NEAR 13N130E AND EXTENDS TO THE
NORTHEAST TO A CIRCULATION NORTHWEST OF THE MARIANAS NEAR 22N143E
AND THEN CONTINUES TO TROPICAL STORM NAMTHEUN NEAR 27N162E. LOW-
LEVEL CONVERGENCE EAST OF THE TROUGH IS GENERATING SCATTERED SHOWERS
AND ISOLATED THUNDERSTORMS...MAINLY WEST AND NORTH OF THE MARIANAS...
WITHIN 200 MILES OF A LINE FROM 11N140E TO 23N153E. A MONSOON-LIKE
TAIL ALSO EXTENDS FROM NAMTHEUN AND IS GENERATING SCATTERED SHOWERS
AND ISOLATED THUNDERSTORMS WITHIN 150 MILES OF A LINE FROM 19N159E TO
25N165E.

A SURFACE TROUGH BETWEEN POHNPEI AND KOSRAE EXTENDS FROM 6N159E TO
ABOUT 16N169E. WIDELY SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS
CAN BE SEEN BETWEEN 9N AND 18N FROM 155E TO 170E.

THE INTERTROPICAL CONVERGENCE ZONE (ITCZ) EXTENDS EASTWARD ALONG A
LINE FROM 11N172E TO BEYOND 11N180. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS CAN BE SEEN WITHIN 200 MILES OF THE ITCZ.

AN UPPER-LEVEL LOW NEAR 20N177E IS SUPPORTING ISOLATED THUNDERSTORMS
AROUND ITS CENTER.

$$

SCHANK


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