Funnel Cloud in Guam, September 24, 2001

Name: Funnel Cloud in Guam, September 24, 2001
Start: 2001-09-24T12:33
End: 2001-09-24T12:35
Location: Guam

September 24, 2001 · NWS GUA · 1 event in 1 county or zone

A Funnel cloud was observed to the north of the National Weather Service Office from 1233 to 1235

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.

A Funnel cloud was observed to the north of the National Weather Service Office from 1233 to 1235

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 24, 9:50 AM SST, 2 hours 43 minutes earlier.

Area forecast discussion, Sep 24, 9:50 AM SST, 2 hours 43 minutes before

AREA SYNOPTIC DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE TIYAN GU
1 AM GUAM LST TUE SEP 25 2001

CORRECTED DATE AND TIME OF ISSUANCE

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

A MONSOON TROUGH EXTENDS FROM TYPHOON LEKIMA (23W) LOCATED NEAR
20N121E TO 15N140E...THEN NORTHEASTWARD TO TYPHOON FRANCISCO (22W)
NEAR 31N149E. LOW LEVEL CONVERGENCE SOUTH OF THE TROUGH IS
GENERATING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS NEAR YAP TO
SOUTH OF THE MARIANA ISLANDS...EASTWARD ACROSS CHUUK AND POHNPEI.
THIS AREA IS BOUNDED BY 12N135E TO 12N147E TO 20N150E TO 22N160E TO
2N160E TO 2N155E TO 4N146E TO 7N140E TO 7N130E BACK TO 12N135E.

LOW-LEVEL EASTERLY WINDS ARE MAKING THEIR WAY ACROSS THE EASTERN
PORTION OF THE DISCUSSION AREA...MAINLY EAST OF CHUUK...AS THE
MONSOON TROUGH LIFTS OUT TO THE NORTH AND WEST. LOW-LEVEL
CONVERGENCE ASSOCIATED WITH WEAK SURFACE LOWS IN THIS REGION IS
GENERATING A LARGE AREA OF SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS AFFECTING KOSRAE...KWAJALEIN... MAJURO...AND EXTENDING
NORTHWARD TO WAKE. THIS AREA IS BOUNDED BY A LINE FROM 2N160E TO
22N160E TO 24N180 TO 17N180 TO 17N176E TO 2N176E BACK TO 2N160E. IN
THE NORTH...NEAR WAKE ISLAND...THE SHOWERS AND THUNDERSTORMS ARE
BEING ENHANCED BY AN UPPER-LEVEL LOW NEAR 20N157E.

LOW-LEVEL CONVERGENCE SOUTH OF YAP AND PALAU IS PRODUCING SCATTERED
SHOWERS AND ISOLATED THUNDERSTORMS BETWEEN THE EQUATOR AND 4N FROM
130E TO 146E.

Event by event

1 funnel cloud. Local standard time, as filed.

Funnel Cloud, Guam

When: September 24, 12:33 PM SST to 12:35 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 2001 Every state in 2001 This day in weather history Warnings 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: 5267629.