363 

WGMY50 PGUM 210306

FFWGUM

GUC010-210345-

/O.NEW.PGUM.FF.W.0001.260121T0306Z-260121T0345Z/

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



BULLETIN - EAS ACTIVATION REQUESTED

Flash Flood Warning

National Weather Service Tiyan GU

106 PM ChST Wed Jan 21 2026



The National Weather Service in Tiyan has issued a



* Flash Flood Warning for...

  Southern Guam...



* Until 145 PM ChST.



* At 106 PM ChST, Doppler radar and automated rain gauges indicated 

  heavy rain falling across the warned area. Between 1 and 2 inches 

  of rain have fallen. Additional rainfall amounts of 2 to 3 inches 

  are possible in the warned area. Flash flooding is ongoing or 

  expected to begin shortly.



  HAZARD...Flash flooding caused by heavy rain.



  SOURCE...Radar and automated gauges.



  IMPACT...Flash flooding of small creeks and streams, urban

           areas, highways, and streets as well as other poor

           drainage and low-lying areas.



* Some locations that will experience flash flooding include...

  Tamuning, Mangilao, Chalan Pago-Ordot, Barrigada, Yona, Hagatna 

  Heights, Talofofo, Mongmong-Toto-Maite, Sinajana, Inarajan, Asan, 

  Piti and Santa Rita.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Turn around, don't drown when encountering flooded roads. Most flood 

deaths occur in vehicles.



Be aware of your surroundings and do not drive on flooded roads.



Flooding is occurring or is imminent. It is important to know where 

you are relative to streams, rivers, or creeks which can become 

killers in heavy rains. Hikers should avoid streams or creeks.



&&



LAT...LON 1336 14461 1337 14461 1338 14462 1339 14462

      1340 14463 1341 14462 1343 14460 1344 14459

      1345 14459 1346 14460 1347 14461 1349 14475

      1343 14483 1341 14480 1332 14479 1335 14464

      1336 14465 1338 14465 1339 14466 1340 14466

      1340 14467 1341 14466 1341 14465 1342 14465

      1342 14464 1343 14464 1344 14462 1345 14462



FLASH FLOOD...RADAR AND GAUGE INDICATED



$$



EM






438 

WGMY70 PGUM 210335

FFSGUM



Flash Flood Statement

National Weather Service Tiyan GU

135 PM ChST Wed Jan 21 2026



GUC010-210345-

/O.CAN.PGUM.FF.W.0001.000000T0000Z-260121T0345Z/

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

Guam-

135 PM ChST Wed Jan 21 2026



...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHERN GUAM...



A line of heavy thunderstorms are moving to the west and away from 

Guam shores, so flash flooding is no longer expected to pose a 

threat at this time.



&&



LAT...LON 1337 14461 1338 14462 1339 14462 1340 14463

      1341 14462 1343 14460 1344 14459 1345 14459

      1346 14460 1347 14461 1349 14475 1343 14483

      1341 14480 1332 14479 1335 14464 1336 14465

      1338 14465 1339 14466 1340 14466 1340 14467

      1341 14466 1341 14465 1342 14465 1342 14464

      1343 14464 1344 14462 1345 14462 1336 14461



$$



EM