Alert archive / Guam / Flash Flood Warnings in 2026

Flash Flood Warning 21, NWS Guam

July 6, 2026

NWS Guam issued this flash flood warning at Jul 6, 2026, 1:21 AM CDT. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 6, 2026, 1:21 AM CDT (06:21 UTC)
Expired: Jul 6, 2026, 4:00 AM CDT
In force: 3 hr
Issued by: NWS Guam
Area: Storm-based polygon
Flood severity: None

The text

As transmitted.

989 
WGMY50 PGUM 060621
FFWGUM
GUC010-MPC100-060815-
/O.NEW.PGUM.FF.W.0021.260706T0621Z-260706T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tiyan GU
421 PM ChST Mon Jul 6 2026

The National Weather Service in Tiyan has issued a

* Flash Flood Warning for...
  Guam...
  Rota...

* Until 615 PM ChST.

* At 421 PM ChST, satellite estimates indicate heavy rain across the
  warned area. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Satellite estimates.

  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...
  Dededo, Tamuning, Yigo, Mangilao, Chalan Pago-Ordot, Barrigada,
  Yona, Hagatna Heights, Andersen AFB, Talofofo, Mongmong-Toto-Maite,
  Sinajana, Inarajan, Asan, Merizo, Piti, Santa Rita, Umatac,
  Sinapalo and Songsong.

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.

Stay away or be swept away. River banks and culverts can become
unstable and unsafe.

&&

LAT...LON 1353 14478 1416 14512 1422 14522 1421 14529
      1420 14530 1414 14529 1409 14521 1409 14512
      1368 14487 1359 14497 1351 14494 1341 14481
      1327 14479 1323 14476 1321 14464 1327 14465
      1333 14461 1340 14463 1346 14460

FLASH FLOOD...SATELLITE INDICATED

$$

TM/DD

2 follow-up statements

158 
WGMY50 PGUM 060759
FFWGUM
GUC010-MPC100-061015-
/O.EXT.PGUM.FF.W.0021.000000T0000Z-260706T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tiyan GU
559 PM ChST Mon Jul 6 2026

The National Weather Service in Tiyan has extended the

* Flash Flood Warning for...
  Guam...
  Rota...

* Until 815 PM ChST.

* At 559 PM ChST, satellite estimates and rain gauge data indicate
  heavy rain continues to fall across the warned area. Flash flooding
  is already occurring.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Satellite estimates 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...
  Dededo, Tamuning, Yigo, Mangilao, Chalan Pago-Ordot, Barrigada,
  Yona, Hagatna Heights, Andersen AFB, Talofofo, Mongmong-Toto-Maite,
  Sinajana, Inarajan, Asan, Merizo, Piti, Santa Rita, Umatac,
  Sinapalo and Songsong.

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.

Stay away or be swept away. River banks and culverts can become
unstable and unsafe.

&&

LAT...LON 1353 14478 1416 14512 1422 14522 1421 14529
      1420 14530 1414 14529 1409 14521 1409 14512
      1368 14487 1359 14497 1351 14494 1341 14481
      1327 14479 1323 14476 1321 14464 1327 14465
      1333 14461 1340 14463 1346 14460

FLASH FLOOD...SATELLITE AND GAUGE INDICATED

$$

JAW/TM

068 
WGMY70 PGUM 060900
FFSGUM

Flash Flood Statement
National Weather Service Tiyan GU
700 PM ChST Mon Jul 6 2026

GUC010-MPC100-060910-
/O.CAN.PGUM.FF.W.0021.000000T0000Z-260706T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Guam-Rota-
700 PM ChST Mon Jul 6 2026

...FLASH FLOOD WARNING IS CANCELLED FOR GUAM AND ROTA...

Super Typhoon Bavi has moved far enough away from the area that the
heavy rains have ended, so there is no longer a flash flooding threat
to Guam and Rota at this time.

A Flood Watch remains in effect until Guam, Rota, Tinian and Saipan
through late Tuesday night.

&&

LAT...LON 1353 14478 1416 14512 1422 14522 1421 14529
      1420 14530 1414 14529 1409 14521 1409 14512
      1368 14487 1359 14497 1351 14494 1341 14481
      1327 14479 1323 14476 1321 14464 1327 14465
      1333 14461 1340 14463 1346 14460

$$

EM

The office that day

Everything else NWS Guam issued on the same UTC day.

Issued	Product	Office	Lasted
Jul 6, 12:19 PM CDT	Coastal Flood Advisory	GUM	37 hr
Jul 6, 2:16 PM CDT	Wind Advisory	GUM	12 hr
Jul 6, 4:19 PM CDT	Hurricane Local Statement	GUM	10 hr
Jul 6, 12:06 AM CDT	Flash Flood Warning	GUM	114 min
Jul 6, 2:03 AM CDT	Areal Flood Advisory	GUM	117 min
Jul 6, 3:19 PM CDT	Hazardous Seas Warning	GUM	23 hr

Nearby

Flash Flood Warnings in Guam, 2026 Flash Flood Warnings in Northern Mariana Islands, 2026 Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.