Alert archive / Guam / Flash Flood Warnings in 2021

Flash Flood Warning 6, NWS Guam

September 23, 2021

NWS Guam issued this flash flood warning at Sep 23, 2021, 6:14 PM CDT. It was in force for 2 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: Sep 23, 2021, 6:14 PM CDT (23:14 UTC)
Expired: Sep 23, 2021, 8:15 PM CDT
In force: 2 hr
Issued by: NWS Guam
Area: Storm-based polygon
Flood severity: None

The text

As transmitted.

330 
WGMY50 PGUM 232314
FFWGUM
GUC010-240115-
/O.NEW.PGUM.FF.W.0006.210923T2314Z-210924T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tiyan GU
914 AM ChST Fri Sep 24 2021

The National Weather Service in Tiyan has issued a

* Flash Flood Warning for...
  Guam Island in the Marianas...

* Until 1115 AM ChST.

* At 914 AM ChST, The public has reported heavy rain across the 
  warned area. Between 4 and 6 inches of rain have fallen. 
  Additional rainfall amounts of 2 to 3 inches are possible in the 
  warned area. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Public reported.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses 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 and Umatac.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 1345 14462 1342 14467 1346 14469 1346 14464
      1353 14479 1365 14486 1360 14495 1342 14478
      1327 14475 1323 14464 1341 14464 1340 14466

FLASH FLOOD...OBSERVED

$$

NRS

The office that day

Everything else NWS Guam issued on the same UTC day.

Issued	Product	Office	Lasted
Sep 22, 8:46 PM CDT	Tropical Storm Warning	GUM	21 hr
Sep 22, 10:30 PM CDT	Areal Flood Advisory	GUM	3 hr
Sep 22, 10:30 PM CDT	Areal Flood Advisory	GUM	3 hr
Sep 23, 12:36 AM CDT	Areal Flood Advisory	GUM	3 hr
Sep 23, 1:12 AM CDT	Areal Flood Advisory	GUM	3 hr
Sep 23, 1:12 AM CDT	Areal Flood Advisory	GUM	3 hr
Sep 23, 4:16 AM CDT	Areal Flood Advisory	GUM	5 hr
Sep 23, 4:16 AM CDT	Areal Flood Advisory	GUM	5 hr
Sep 23, 4:49 AM CDT	Areal Flood Advisory	GUM	4 hr
Sep 23, 5:18 PM CDT	Small Craft Advisory	GUM	6 hr
Sep 23, 5:26 PM CDT	High Surf Advisory	GUM	6 hr

Nearby

Flash Flood Warnings in Guam, 2021 Every flash flood warning in 2021

Sources

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