Satellite Interpretation Message
Issued by NWS Tiyan, Guam

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000
ATPQ40 PGUM 200310
SIMGUM

SATELLITE INTERPRETATION MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
110 PM CHST WED OCT 20 2021

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

A SURFACE TROUGH EXTENDING ACROSS PALAU AND YAP FROM NEAR 7N133E TO
THE WEST OF THE MARIANAS NEAR 16N142E IS TRIGGERING SHOWERS AND
THUNDERSTORMS BETWEEN 5N AND 11N FROM 130E TO 140E AND FARTHER NORTH
OF YAP BETWEEN 12N AND 16N FROM 136E TO 141E. FARTHER WEST, A SURGE
OF NORTHEASTERLY WINDS IS GENERATING A LINE OF SHOWERS AND
THUNDERSTORMS BETWEEN 12N AND 15N WEST OF 135E.

A SECOND SURFACE TROUGH JUST EAST OF THE MARIANAS IS CAUSING SHOWERS
AND THUNDERSTORMS WITHIN 80 MILES OF A LINE FROM 12N146E TO 21N150E.
THIS IS JUST EAST OF THE MARIANAS WATERS. AN UPPER-LEVEL LOW CENTERED
NEAR 18N151E IS HELPING TO PRODUCE THUNDERSTORMS EAST-NORTHEAST OF
PAGAN ISLAND.

A BROAD TROUGH SPANS EASTERN MICRONESIA FROM NORTHWEST OF CHUUK NEAR
9N148E TO A CIRCULATION CENTERED NORTHEAST OF POHNPEI NEAR
10N160E...THEN CONTINUES EASTWARD TO ANOTHER CIRCULATION NORTHEAST OF
MAJURO NEAR 12N179E. SHOWERS AND THUNDERSTORMS ARE FOUND NEAR AND
NORTH OF CHUUK...POHNPEI AND KOSRAE BETWEEN 6N AND 14N FROM 148E TO
165E...AND OVER THE NORTHERN MARSHALL ISLANDS BETWEEN 10N AND 13N
EAST OF 165E.

A WESTWARD-MOVING UPPER-LEVEL LOW EAST OF WAKE ISLAND NEAR 20N178E IS
TRIGGERING SCATTERED THUNDERSTORMS BETWEEN 17N AND 24N EAST OF 174E.

$$

AYDLETT


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