652
AXPQ20 PGUM 110116
TWDPQ
TROPICAL WEATHER DISCUSSION
NATIONAL WEATHER SERVICE TIYAN GU
1116 AM CHST SUN MAY 11 2025
TROPICAL WEATHER DISCUSSION FOR THE WESTERN NORTH PACIFIC BETWEEN
THE EQUATOR AND 25N FROM 130E TO 180. THE FOLLOWING INFORMATION IS
BASED ON RECENT SATELLITE IMAGERY/DATA, WEATHER OBSERVATIONS, RADAR,
AND METEOROLOGICAL ANALYSIS.
..SPECIAL FEATURES
NONE.
..OTHER WEATHER SYSTEMS
NEAR EQUATORIAL TROUGH...
A NEAR EQUATORIAL TROUGH (NET) ENTERS THE REGION NEAR 4N130E AND
PASSES NORTH OF TOBI AND HELAN'S REEF TO END NEAR EQ142E, WELL SOUTH
OF EAURIPIK IN SOUTHERN YAP STATE. MODERATE TO DEEP CONVECTION IS
ASSOCIATED WITH THIS FEATURE, PRODUCING WIDESPREAD SHOWERS WITHIN
ABOUT 150 MILES FROM THE TROUGH AXIS. THERE IS AN ISOLATED POCKET OF
STRONG THUNDERSTORMS NEAR THE NORTHERN INDONESIA ISLANDS OF FANI,
RENI, AJU AND ORMSBEE REEF. THIS FEATURE WILL REMAIN FAIRLY
STATIONARY WITH LITTLE CHANGE IN CONVECTIVE ACTIVITY OVER THE NEXT
FEW DAYS.
TRADE-WIND TROUGHS...
THERE ARE 3 MAJOR TRADE-WIND TROUGHS THAT ARE OBSERVED IN
MICRONESIA. THE FIRST TROUGH IS TO THE WEST OF PALAU, THE SECOND OVER
CHUUK PROPER, AND THE THIRD IS BETWEEN MAJURO AND THE DATE LINE.
THE FIRST TROUGH HAS ENDPOINTS NEAR 11N132E EXTENDING TO 6N133E,
DUE WEST OF PALAU. THIS TROUGH IS PRODUCING WIDESPREAD CLOUD COVER
WITH SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS. THIS
FEATURE IS EXPECTED TO CONTINUE TO MOVE WESTWARD AND MOVE OUT OF THE
REGION OVER THE NEXT FEW DAYS.
THE SECOND TROUGH, IS A EXTENSIVE BROAD SURFACE TROUGH. THIS FEATURE
HAS THE NORTHERN ENDPOINT NEAR 10N151E AND EXTENDS OVER CHUUK PROPER
TO THEN EXTEND FURTHER SOUTH TO NEAR 4N151E. THIS FEATURE IS
PRODUCING NUMEROUS TO WIDESPREAD CLOUD COVER, AND SCATTERED TO
NUMEROUS SHOWERS REACHING OUT ABOUT 60 MILES ON EITHER SIDE OF THE
TROUGH AXIS. THE FEATURE IS EXPECTED TO CONTINUE TO MOVE WESTWARD INTO
EASTERN YAP STATE OVER THE NEXT FEW DAYS, BRINGING SHOWERS TO THE
EASTERN ISLANDS OF YAP STATE.
THE THIRD TROUGH, IS LOCATED BETWEEN MAJURO ATOLL AND THE DATE LINE.
THE AXIS ENDPOINTS ARE NEAR 8N178E AND 1N176E. CONVECTION IS OBSERVED
ALONG THE LEADING EDGE OF THIS FEATURE, AND IS PRODUCING EXTENSIVE
CLOUD COVER AND SCATTERED SHOWERS. THE FEATURE WILL BE MOVING
WESTWARD TOWARDS MAJURO AS CONVECTIVE ACTIVITY INCREASES OVER THE
NEXT DAY OR TWO.
OTHER SYSTEMS...
UPPER-LEVEL TROUGH...
AN UPPER-LEVEL TROUGH ENTERS THE REGION NEAR 24N180 AND EXTENDS
SOUTHWEST, SOUTH OF WAKE ISLAND TO END NEAR 17N152E. THIS FEATURE IS
BEING PINCHED BY TWO UPPER-LEVEL HIGHS. WITH LITTLE TO NO SURFACE
FEATURES TO INTERACT WITH, LITTLE TO NO ACTIVITY IS ASSOCIATED WITH
THIS TROUGH, EXCEPT FOR THE PORTION ABOVE 20N TO THE DATE LINE. THIS
COMBINATION IS PRODUCING ISOLATED TO SCATTERED SHOWERS AND WIDESPREAD
CLOUD COVER. OVER THE NEXT FEW DAYS, THIS FEATURE WILL CONTINUE TO
BE PINCHED OFF AND IS EXPECTED TO ERODE OVER THE NEXT SEVERAL DAYS.
BOWSHER
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page