405 

WHMY50 PGUM 191112

SMWGUM

PMZ151-191145-

/O.NEW.PGUM.MA.W.0025.260919T1112Z-260919T1145Z/



BULLETIN - IMMEDIATE BROADCAST REQUESTED

SPECIAL MARINE WARNING

NATIONAL WEATHER SERVICE TIYAN GU

911 PM CHST SAT SEP 19 2026



THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A



* SPECIAL MARINE WARNING FOR...

  GUAM COASTAL WATERS...



* UNTIL 945 PM CHST.



* AT 911 PM CHST...STRONG THUNDERSTORMS WERE LOCATED OVER THE WEST 

  COAST OF GUAM...MOVING EAST AT 10 KNOTS.



  HAZARD...WIND GUSTS 34 KNOTS OR GREATER. FREQUENT LIGHTNING



  SOURCE...RADAR.



  IMPACT...SMALL CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND

  SUDDENLY HIGHER WAVES.



* STRONG THUNDERSTORMS WILL REMAIN OVER MAINLY OPEN WATERS.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



FREQUENT LIGHTNING IS OCCURRING WITH THESE STORMS. IF CAUGHT ON THE

OPEN WATER STAY BELOW DECK IF POSSIBLE...KEEP AWAY FROM UNGROUNDED

METAL OBJECTS.



&&



LAT...LON 1343 14446 1351 14470 1345 14468 1341 14464

      1328 14466 1322 14469 1323 14436 

TIME...MOT...LOC 1111Z 284DEG 10KT 1352 14472 1342 14452 1326 14444 



HAIL...0.00IN

WIND...>34KTS



$$



WILLIAMS






990 

WGMY70 PGUM 191142

FFSGUM



Flash Flood Statement

National Weather Service Tiyan GU

942 PM ChST Sat Sep 19 2026



GUC010-191152-

/O.EXP.PGUM.FF.W.0032.000000T0000Z-260919T1145Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

Guam-

942 PM ChST Sat Sep 19 2026



...FLASH FLOOD WARNING WILL EXPIRE AT 945 PM CHST THIS EVENING FOR

SOUTHWESTERN GUAM...



Heavy rainfall that led to flash flooding has ended. Rain could still

lead to urban and small stream flooding for the next hour. A Flood

Advisory remains in effect.



&&



LAT...LON 1335 14464 1337 14465 1334 14464 1342 14468

      1338 14475 1327 14476 1325 14472 1328 14467

      1329 14466 1330 14466 1329 14465 1333 14464

      1331 14466 1335 14463



$$



Williams