Flood, Guam
- When
- September 8, 10:00 AM SST to 10:00 PM SST
- Where
- Guam County, Countywide
- Reported by
- OFFICIAL NWS OBS.
Flood in Guam, September 8, 2001
Convergent wind flow caused heavy rain and showers to develop across Guam. 48 inches of rain was recorded at an automated weather station in Mangilao during the same time period.
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- 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 GUA wrote it up.
Convergent wind flow caused heavy rain and showers to develop across Guam. 1.24 inches of rain occurred between 1000 and 2200 at the National Weather Service Office and 1.48 inches of rain was recorded at an automated weather station in Mangilao during the same time period.
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 GUA wrote its last area forecast discussion before the first event at Sep 8, 4:55 AM SST, 5 hours 5 minutes earlier.
Area forecast discussion, Sep 8, 4:55 AM SST, 5 hours 5 minutes before
AREA SYNOPTIC DISCUSSION NATIONAL WEATHER SERVICE TIYAN GU 1 AM GUAM LST SUN SEP 9 2001 WESTERN NORTH PACIFIC BETWEEN EQUATOR AND 25N FROM 130E TO 180. TYPHOON DANAS (19W)...CENTERED NEAR 28N142E...IS MOVING WEST AT 10 MPH WITH MAXIMUM SUSTAINED WINDS OF 115 MPH. ALL OF THE SHOWER AND THUNDERSTORM ACTIVITY DIRECTLY ASSOCIATED WITH DANAS IS NORTH OF 25N...OUTSIDE OF THE DISCUSSION AREA. LOW-LEVEL CONVERGENCE SOUTH AND SOUTHEAST OF TYPHOON DANAS IS PRODUCING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS OVER THE MARIANA ISLANDS IN AN AREA BOUNDED BY A LINE FROM 12N134E TO 24N143E TO 24N152E TO 12N145E BACK TO 12N134E. OTHER SHOWERS ARE ALONG A LINE FROM 11N152E TO 16N154E. AN UPPER-LEVEL LOW CENTERED WEST OF WAKE ISLAND NEAR 18N160E IS PRODUCING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS BETWEEN 16N AND 25N AND FROM 154E TO 163E. LOW-LEVEL CONVERGENCE IS GENERATING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS FROM WELL SOUTH OF THE REPUBLIC OF PALAU NORTHEASTWARD ACROSS CHUUK...TO JUST NORTH OF POHNPEI...THEN TO THE SOUTH OF WAKE ISLAND. THIS AREA IS BOUNDED BY A LINE FROM THE EQUATOR AT 135E TO 4N134E TO 10N156E TO THE EQUATOR AT 160E AND BACK TO THE EQUATOR AT 135E.
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
- Lightning Strike in Florida, September 8, 2001
- Damaging Wind in Illinois, September 8, 2001
- Damaging Winds in Michigan, September 8, 2001
- Lightning Strike in Missouri, September 8, 2001
- Flash Flood and Hail in Arkansas, September 8, 2001
- Tornadoes and Flash Flood in Texas, September 8 to 9, 2001
- Flash Flood in Louisiana, September 8, 2001
- Flash Flooding and Hail in Oklahoma, September 8, 2001
- Lightning Strike in Florida, September 8, 2001
- Damaging Winds and Lightning Strike in Indiana, September 8, 2001
- Lightning Strike in Alabama, September 8, 2001
- Flash Flooding and Damaging Wind in Mississippi, September 8, 2001
More
Every storm in Guam in 2001Every state in 2001This day in weather historyWarnings in Guam, September 2001
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: 5267630.