000 ATPQ40 PGUM 251513 SIMGUM SATELLITE INTERPRETATION MESSAGE NATIONAL WEATHER SERVICE TIYAN GU 100 AM CHST SUN MAY 26 2013 WESTERN NORTH PACIFIC BETWEEN EQUATOR AND 25N FROM 130E TO 180. A FRONTAL BOUNDARY CURVES WESTWARD FROM NORTH OF WAKE ISLAND THROUGH 25N161E TO A LOW PRESSURE SYSTEM CENTERED NEAR IWO TO ISLAND AT 25N140E. THIS BOUNDARY THEN CONTINUES SOUTHWESTWARD TO BEYOND 130E AT 18N. SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ARE FOUND ALONG AND UP TO 200 MILES NORTH OF THIS BOUNDARY. A SURFACE TROUGH RUNS NORTHWARD FROM 1N135E TO 9N136E. ISOLATED THUNDERSTORMS ARE PRESENT NEAR THIS FEATURE SOUTHEAST OF KOROR WITHIN 50 MILES OF 6N138E. $$ CHAN