Funnel Cloud in Guam, September 11, 2002

Name: Funnel Cloud in Guam, September 11, 2002
Start: 2002-09-11T12:40
End: 2002-09-11T12:44
Location: Guam

September 11, 2002 · NWS GUA · 1 event in 1 county or zone

On the 11th a Funnel cloud was observed west of the Guam International Airport between 1240 and 1244

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.

On the 11th a Funnel cloud was observed west of the Guam International Airport between 1240 and 1244

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 11, 3:56 AM SST, 8 hours 44 minutes earlier.

Area forecast discussion, Sep 11, 3:56 AM SST, 8 hours 44 minutes before

AREA SYNOPTIC DISCUSSION
NATIONAL WEATHER SERVICE TIYAN GU
1 AM GUAM LST THU SEP 12 2002

WESTERN NORTH PACIFIC BETWEEN EQUATOR AND 25N FROM 130E TO 180.

A MONSOON TROUGH EXTENDS FROM 17N130E THROUGH A WEAK CIRCULATION
NEAR 14N137E AND ANOTHER CIRCULATION NEAR 9N155E...AND CONTINUES
EASTWARD THROUGH A THIRD CIRCULATION NEAR 12N174E TO 11N180.

TO THE NORTH OF PALAU...THE MONSOON TROUGH COMBINED WITH FAVORABLE
UPPER-LEVEL WINDS IS GENERATING SCATTERED SHOWERS BOUNDED BY 19N130E
TO 17N133E TO 20N141E TO 17N142E TO 10N135E TO 10N130E BACK TO
19N130E.

FURTHER EAST...CONVERGENCE IN THE MONSOON WIND FLOW IS PRODUCING
SCATTERED SHOWERS AND THUNDERSTORMS ACROSS YAP AND CHUUK STATES
BETWEEN 5N AND 12N FROM 138E TO 152E...ACROSS THE MARSHALL ISLANDS
BETWEEN THE EQUATOR AND 13N FROM 165E TO 175E...AND BETWEEN 1N AND
8N FROM 175E TO 180.

AN UPPER-LEVEL LOW CENTERED NEAR 21N173E IS GENERATING SCATTERED
SHOWERS SOUTHWEST OF MIDWAY ISLAND BETWEEN 15N AND 25N EAST OF A
LINE FROM 15N179E TO 25N176E.

Event by event

1 funnel cloud. Local standard time, as filed.

Funnel Cloud, Guam

When: September 11, 12:40 PM SST to 12:44 PM SST
Where: Guam County, Central Portion
Reported by: OFFICIAL NWS OBS.

What these are

Funnel Cloud: A rotating column of cloud extending from a thunderstorm that did not reach the ground.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Guam in 2002 Every state in 2002 This day in weather history Warnings in Guam, September 2002

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: 5325262.