Alert archive / Guam / Flash Flood Warnings in 2004

Flash Flood Warning 1, NWS Guam

June 26, 2004

NWS Guam issued this flash flood warning at Jun 26, 2004, 9:25 PM CDT. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 26, 2004, 9:25 PM CDT (02:25 UTC)
Expired
Jun 27, 2004, 2:00 AM CDT
In force
5 hr
Issued by
NWS Guam
Area
Whole counties

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGMY50 PGUM 270228
FFWMY 
GUZ001-270700-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TIYAN GU
1225 PM LST SUN JUN 27 2004

THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A 

* FLASH FLOOD WARNING FOR SOUTHERN GUAM SOUTH OF A LINE FROM 
  AGAT BAY TO PAGO BAY

* UNTIL 5 PM LST TODAY

* AT 1220 PM LST...DOPPLER WEATHER RADAR INDICATED A LARGE AREA OF 
  TORRENTIAL RAIN OVER SOUTHERN GUAM WITH RAINFALL RATES UP TO 
  3 INCHES PER HOUR. THIS AREA HAS BEEN STATIONARY OVER THE 
  SOUTHERN MOUNTAINS.

* EXCESSIVE RAINFALL OF AN ADDITIONAL 4 TO 5 INCHES BY 5 PM THIS 
  AFTERNOON WILL PRODUCE FLASH FLOODING IN MOUNTAIN VALLEYS...AT 
  THE BASE OF MOUNTAINS...AND ALONG RIVERS AND STREAMS.

IF YOU LIVE IN A FLOOD-PRONE AREA...AT THE BASE OF MOUNTAIN 
VALLEYS...OR NEAR STREAMS AND RIVERS...GO TO HIGHER GROUND AT 
ONCE. AVOID DRIVING IN THE WARNED AREA.  NEVER TRY TO CROSS OR FORD
A FLOODED ROAD.

$$
GUARD
3 follow-up statements
000 
WGMY70 PGUM 270445
FFSMY 
GUZ001-270700-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TIYAN GU
245 PM LST SUN JUN 27 2004

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN GUAM...

A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM FOR SOUTHERN GUAM 
SOUTH OF A LINE FROM AGAT BAY TO PAGO BAY. A FLASH FLOOD WATCH 
REMAINS IN EFFECT UNTIL 6 PM.

AT 240 PM LST...DOPPLER WEATHER RADAR INDICATED A SLOW-MOVING AREA 
OF TORRENTIAL RAIN OVER GUAM WITH RAINFALL RATES UP TO 4 INCHES PER 
HOUR. THIS AREA HAS BEEN BRINGING REPEAT HEAVY SHOWERS OVER THE 
SOUTHERN MOUNTAINS.

PRELIMINARY RAINFALL TOTALS SO FAR TODAY INCLUDE...
MONGMONG/TOTO/MAITE...           10.51 INCHES
GUAM INTERNATIONAL AIRPORT...     9.46 INCHES
MANGILAO AUTOMATED OBSERVATION... 7.94 INCHES
INARAJAN AUTOMATED OBSERVATION... 7.17 INCHES
ANDERSEN AIR FORCE BASE...        4.66 INCHES
MERIZO AUTOMATED OBSERVATION...   4.36 INCHES

IF YOU LIVE IN A FLOOD-PRONE AREA...AT THE BASE OF MOUNTAIN 
VALLEYS...OR NEAR STREAMS AND RIVERS...GO TO HIGHER GROUND AT 
ONCE. AVOID DRIVING IN THE WARNED AREA.  NEVER TRY TO CROSS A 
FLOODED ROAD.

$$
STANKO/HENDRICKS
000 
WGMY70 PGUM 270552
FFSMY 
GUZ001-270700-
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TIYAN GU
350 PM LST SUN JUN 27 2004

...SHELTERS OPEN FOR FLOOD VICTIMS ON GUAM...

A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM FOR SOUTHERN GUAM 
SOUTH OF A LINE FROM AGAT BAY TO PAGO BAY. A FLASH FLOOD WATCH 
REMAINS IN EFFECT UNTIL 6 PM.

SHELTERS ARE NOW OPEN AT THE FOLLOWING LOCATIONS ON GUAM...
FB LEON GUERRERO MIDDLE SCHOOL
UPI ELEMENTARY SCHOOL
ASTUMBO ELEMENTARY SCHOOL
MA ULLOA ELEMENTARY SCHOOL
MACHANANAO ELEMENTARY SCHOOL
GEORGE WASHINGTON HIGH SCHOOL
ORDOT CHALAN PAGO ELEMENTARY SCHOOL
INARAJAN MIDDLE SCHOOL
HS TRUMAN ELEMENTARY SCHOOL
MERIZO MARTYRS ELEMENTARY SCHOOL
MU LUJAN ELEMENTARY SCHOOL

AT 345 PM LST...DOPPLER WEATHER RADAR INDICATED A SLOW-MOVING AREA 
OF TORRENTIAL RAIN OVER GUAM WITH RAINFALL RATES UP TO 4 INCHES PER 
HOUR. A BRIEF BREAK IS EXPECTED IN THE NEXT HOUR OR SO...BUT HEAVY 
SHOWERS WILL ONCE AGAIN MOVE OVER THE SOUTHERN MOUNTAINS.

PRELIMINARY RAINFALL TOTALS SO FAR TODAY INCLUDE...
MONGMONG/TOTO/MAITE...           11.75 INCHES
GUAM INTERNATIONAL AIRPORT...    11.13 INCHES

IF YOU LIVE IN A FLOOD-PRONE AREA...AT THE BASE OF MOUNTAIN 
VALLEYS...OR NEAR STREAMS AND RIVERS...GO TO HIGHER GROUND AT 
ONCE. AVOID DRIVING IN THE WARNED AREA.  NEVER TRY TO CROSS A 
FLOODED ROAD.

$$
STANKO/HENDRICKS
000 
WGMY70 PGUM 270643 AAA
FFSMY 
GUZ001-270700-
FLASH FLOOD STATEMENT...UPDATED
NATIONAL WEATHER SERVICE TIYAN GU
445 PM LST SUN JUN 27 2004

UPDATED TO INCLUDE LATEST SHELTER INFORMATION

...SHELTERS OPEN FOR FLOOD VICTIMS ON GUAM...

A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM FOR SOUTHERN GUAM 
SOUTH OF A LINE FROM AGAT BAY TO PAGO BAY. A FLASH FLOOD WATCH 
REMAINS IN EFFECT UNTIL 6 PM.

SHELTERS ARE NOW OPEN AT THE FOLLOWING LOCATIONS ON GUAM...
FB LEON GUERRERO MIDDLE SCHOOL
GEORGE WASHINGTON HIGH SCHOOL
INARAJAN MIDDLE SCHOOL
HS TRUMAN ELEMENTARY SCHOOL

FOR FURTHER INFORMATION REGARDING SHELTERS CONTACT GUAM CIVIL 
DEFENSE AT 475-9600

AT 345 PM LST...DOPPLER WEATHER RADAR INDICATED A SLOW-MOVING AREA 
OF TORRENTIAL RAIN OVER GUAM WITH RAINFALL RATES UP TO 4 INCHES PER 
HOUR. A BRIEF BREAK IS EXPECTED IN THE NEXT HOUR OR SO...BUT HEAVY 
SHOWERS WILL ONCE AGAIN MOVE OVER THE SOUTHERN MOUNTAINS.

PRELIMINARY RAINFALL TOTALS SO FAR TODAY INCLUDE...
MONGMONG/TOTO/MAITE...           11.75 INCHES
GUAM INTERNATIONAL AIRPORT...    11.13 INCHES

IF YOU LIVE IN A FLOOD-PRONE AREA...AT THE BASE OF MOUNTAIN 
VALLEYS...OR NEAR STREAMS AND RIVERS...GO TO HIGHER GROUND AT 
ONCE. AVOID DRIVING IN THE WARNED AREA.  NEVER TRY TO CROSS A 
FLOODED ROAD.

$$
WELLS/HALL

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Jun 26, 9:58 AM CDT, 11 hours 27 minutes earlier.

Area forecast discussion, Jun 26, 9:58 AM CDT, 11 hours 27 minutes before
AREA SYNOPTIC DISCUSSION
NATIONAL WEATHER SERVICE TIYAN GU
1 AM GUAM LST SUN JUN 27 2004

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

TROPICAL STORM MINDULLE...CENTERED NEAR 15N130E...IS MOVING WEST-
NORTHWEST AT 9 MPH WITH MAXIMUM SUSTAINED WINDS OF 60 MPH. NUMEROUS
SHOWERS AND ISOLATED THUNDERSTORMS EXTEND EASTWARD FROM MINDULLE TO
134E BETWEEN 10N AND 17N. SEE JOINT TYPHOON WARNING CENTER BULLETIN
WTPN31 PGTW FOR FURTHER DETAILS.

TROPICAL STORM TINGTING...CENTERED NEAR 12N150E...IS MOVING
NORTHWEST AT 5 MPH WITH MAXIMUM SUSTAINED WINDS OF 45 MPH. NUMEROUS
SHOWERS AND ISOLATED THUNDERSTORMS ASSOCIATED WITH TINGTING EXTEND
BETWEEN 8N AND 16N FROM 140E TO 157E. THIS INCLUDES THE MARIANA
ISLANDS AND CHUUK STATE. SEE JOINT TYPHOON WARNING CENTER BULLETIN
WTPN32 PGTW FOR FURTHER DETAILS.

A MONSOON TROUGH STRETCHES FROM MINDULLE EASTWARD THROUGH TINGTING
TO 10N160E. A TRADE WIND TROUGH EXTENDS FROM 10N160E TO THE EQUATOR
AND 167E. CONVERGENT FLOW ASSOCIATED WITH THE MONSOON TROUGH EAST OF
TINGTING IS PRODUCING SCATTERED SHOWERS SOUTHWEST OF WAKE ISLAND
BETWEEN 12N AND 20N FROM 157E TO 170E.

DIVERGENT WINDS ALOFT SOUTH OF AN UPPER-LEVEL LOW CENTERED NEAR
30N170E IS PROVIDING THE LIFT TO GENERATE SCATTERED SHOWERS AND
ISOLATED THUNDERSTORMS NORTHEAST OF WAKE ISLAND BETWEEN 20N AND 25N
FROM 168E TO 178E.

TRADE WIND CONVERGENCE IS GENERATING SCATTERED SHOWERS NEAR THE
REPUBLIC OF THE MARSHALL ISLANDS BETWEEN THE EQUATOR AND 5N FROM
170E TO 180...AND NORTHEAST OF MAJURO BETWEEN 10N AND 13N FROM 172E
TO 175E.

The office that day

Everything else NWS Guam issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 27, 2:00 AM CDTFlash Flood WarningGUM6 hr
Jun 27, 8:00 AM CDTFlash Flood WarningGUM6 hr
Jun 27, 2:00 PM CDTFlash Flood WarningGUM10 hr

Nearby

Flash Flood Warnings in Guam, 2004Every flash flood warning in 2004

Sources

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