Flood, Guam
- When
- September 2, 12:00 AM GST to 9:00 AM GST
- Where
- Guam County, 5 mi NNE of Dededo to 1 mi NW of Tamuning
- Cause
- Heavy Rain / Tropical System
- Property damage
- $100,000
- Reported by
- Newspaper
- Coordinates
- 13.587, 144.858
Flood in Guam, September 2, 2011
A tropical disturbance brought heavy rain and local flooding to Guam on the morning of Friday September 2nd. 02 inches in Toto and at the University of Guam.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- $100,000
- Crop damage
- None recorded
- Events
- 1
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
What happened
The episode as NWS GUM wrote it up.
A tropical disturbance brought heavy rain and local flooding to Guam on the morning of Friday September 2nd. The highest totals were across central and northern Guam, including 5.06 inches at Guam International Airport, 5.37 inches at Andersen AFB, and 7.02 inches in Toto and at the University of Guam. Homes in low-lying areas of Yigo, Dededo, Ordot and Chalan Pago in northern and central Guam were flooded. The Red Cross housed seven familes totalling 23 people after their homes were made unsafe by the flood. No injuries were reported, and total damage is estimated at $100,000.
What forecasters said that day
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Guam wrote its last area forecast discussion before the first event at Sep 1, 8:29 AM UTC, 5 hours 31 minutes earlier.
Area forecast discussion, Sep 1, 8:29 AM UTC, 5 hours 31 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TIYAN GU 629 PM CHST THU SEP 1 2011 .SYNOPSIS...LOW-LEVEL CONVERGENCE NEAR THE MONSOON TROUGH PRODUCED SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS TO THE EAST OF THE MARIANAS. ISOLATED SHOWERS PREVAIL ACROSS THE LOCAL AREA THIS AFTERNOON. && .DISCUSSION... LITTLE CHANGE TO FORECAST. UPDATED SOME OF THE WINDS WITH UKMET WINDS AS THEY LOOKED THE BEST. MODELS AND FORECAST STILL INDICATE THAT SCATTERED SHOWERS WILL BEGIN ON FRIDAY ACROSS THE LOCAL AREA. SATELLITE AND RADAR SEEM TO INDICATE THAT SHOWER ACTIVITY IS EITHER FURTHER EAST OR LACKING IN COVERAGE. ONE COULD MAKE THE ARGUMENT THAT SCATTERED SHOWERS MAY BEGIN LATER IN THE DAY FRIDAY. WHILE THIS MY BE TRUE FEEL THAT IT IS TOO CLOSE TO CALL SO LEFT FORECAST AS IS. SCATTERED SHOWERS EXPECTED THROUGH THE WEEKEND IN RESPONSE TO AN INCREASE IN ACTIVITY ALONG THE MONSOON TROUGH. && .MARINE... WEST TO NORTHWEST SWELL WILL CONTINUE THROUGH THE FORECAST. MODELS KEEP THE SWELL AT SIX FEET THE NEXT FEW DAYS. SURF EXPECTED TO BE 7 TO 9 FEET ON WEST AND NORTH FACING REEFS FOR TINIAN AND SAIPAN THROUGH THE NIGHT. THIS SHOULD FALL TO 6 TO 8 FEET BY FRIDAY MORNING. SURF WILL BE 6 TO 8 FEET ON WEST AND NORTH FACING REEFS OVER GUAM AND ROTA THROUGH THE WEEKEND. && .EASTERN MICRONESIA... A MODEST TRADE-WIND CONVERGENCE ZONE IS STRETCHING EASTWARD ALONG 7N FROM POHNPEI TO WELL BEYOND THE DATE LINE. SATELLITE IMAGERY INDICATES A FEW DISTURBANCES PROGGED TO TRACK WESTWARD. HOWEVER... THEY ARE BEING DRIED BY SUBSIDENCE FROM AN UPPER HIGH EXTENDING WESTWARD. JUST WEST OF THE UPPER HIGH...AN UPPER TROUGH IS PERSISTING NEAR KOSRAE WITH AN UPPER LOW POSSIBLY FORMING JUST NORTHEAST OF KOSRAE. PRESENTLY THE UPPER HIGH EXTENDS FROM EAST OF THE DATELINE TO KOSRAE WITH CONVECTION FROM A SURFACE TROUGH SOUTH OF THE HIGH MOVING SLOWLY TOWARD KOSRAE. A SURFACE RIDGE IS PRESENTLY AFFECTING POHNPEI WITH SLIGHTLY DRIER WEATHER. && .WESTERN MICRONESIA... TROPICAL STORM TALAS IS MOVING NORTHWARD AWAY FROM 25N. IN RESPONSE...IT WILL ALSO DRAG THE MONSOON TROUGH CURRENTLY NEAR THE MARIANAS NORTHWARD AND ALLOW THE RIDGE TO BUILD OVER WESTERN MICRONESIA FROM CHUUK WESTWARD TO YAP AND KOROR. AS A RESULT... WEATHER OVER KOROR...YAP AND CHUUK IS ANTICIPATED TO GRADUALLY DRY OUT THRU TONIGHT WITH PARTLY CLOUDY SKIES BEGINNING FRIDAY. && .GUM WATCHES/WARNINGS/ADVISORIES... GU...HIGH SURF ADVISORY UNTIL 6 AM CHST FRIDAY FOR GUZ003-004. MARIANAS WATERS...NONE. && ZIOBRO/DEVITA
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 flood. Local standard time, as filed.
What these are
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Damaging Winds in Iowa, September 2, 2011
- Damaging Winds in Wisconsin, September 2, 2011
- Wildfire in Texas, September 2 to 21, 2011
- Wildfire in Texas, September 2 to 13, 2011
- Storm Surge in Louisiana, September 2 to 6, 2011
- Damaging Winds and Lightning Strike in Iowa, September 2 to 3, 2011
- Wildfire in Idaho, September 2 to 3, 2011
- Flash Flood and Hail in North Carolina, September 2, 2011
- Tropical Storm in Louisiana, September 2 to 5, 2011
- Damaging Winds and Lightning Strike in Wisconsin, September 2, 2011
- Wildfire in California, September 2 to 4, 2011
- Heavy Rain in Arizona, September 2, 2011
More
Every storm in Guam in 2011Every state in 2011This day in weather historyWarnings in Guam, September 2011
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 349699.