Alert archive / Guam / Flash Flood Warnings in 2004

Flash Flood Warning 3, NWS Guam

June 27, 2004

NWS Guam issued this flash flood warning at Jun 27, 2004, 8:00 AM CDT. It was in force for 6 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 27, 2004, 8:00 AM CDT (13:00 UTC)
Expired: Jun 27, 2004, 2:00 PM CDT
In force: 6 hr
Issued by: NWS Guam
Area: Whole counties

The text

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

000 
WGMY50 PGUM 271255
FFWMY 
GUZ001-271900-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TIYAN GU
1100 PM LST SUN JUN 27 2004

THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A 

* FLASH FLOOD WARNING FOR GUAM

* UNTIL 5 AM LST MONDAY MORNING

* AT 1045 PM LST...DOPPLER WEATHER RADAR INDICATED YET MORE HEAVY 
  SHOWERS FORMING NORTHWEST OF GUAM AND MOVING SOUTHEASTWARD. 
  RAINFALL RATES UP TO 3 INCHES PER HOUR HAVE BEEN OBSERVED. THE 
  SHOWERS KEEP MOVING OVER THE SAME AREA CAUSING EXCESSIVE RAINFALL 
  ACCUMULATION ON GUAM.

* EXCESSIVE RAINFALL OF AN ADDITIONAL 2 TO 4 INCHES BY 5 AM MONDAY 
  MORNING ON TOP OF GROUND ALREADY SATURATED WILL PRODUCE FLASH 
  FLOODING IN VALLEYS...AT THE BASE OF MOUNTAINS...ALONG RIVERS AND 
  STREAMS...ALONG ROADWAYS AND IN LOW-LYING AREAS.

IF YOU LIVE IN A LOW-LYING 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

1 follow-up statement

000 
WGMY70 PGUM 271453 CCA
FFSMY 
GUZ001-271900-
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TIYAN GU
100 AM LST MON JUN 28 2004

...RECORD SETTING RAIN CONTINUES ON GUAM...

A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM.
A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 6 PM MONDAY.

AT 100 AM LST...DOPPLER WEATHER RADAR INDICATED A BAND OF HEAVY 
RAIN SHOWERS REMAINS OVER GUAM. TORRENTIAL RAIN RATES OF UP TO 2 
INCHES PER HOUR HAVE BEEN ESTIMATED BY NATIONAL WEATHER SERVICE 
DOPPLER RADAR IN TIYAN GUAM. HEAVY SHOWERS CONTINUE TO FORM TO THE 
NORTHWEST OF GUAM...THEN TRAIN TO THE SOUTHEAST ACROSS THE ISLAND.

PRELIMINARY DAILY RAINFALL TOTALS FOR JUNE 27 INCLUDE...

OBSERVER IN TOTO...               16.81 INCHES
GUAM INTERNATIONAL AIRPORT...     16.00 INCHES
INARAJAN AUTOMATED OBSERVATION... 15.47 INCHES
MANGILAO AUTOMATED OBSERVATION... 12.56 INCHES
MERIZO AUTOMATED OBSERVATION...   10.43 INCHES
APRA HARBOR AUTO OBSERVATION...    8.34 INCHES
ANDERSEN AIR FORCE BASE...         8.25 INCHES

THE 16.00 INCHES OF RAINFALL RECEIVED JUNE 27 SHATTERS THE DAILY 
RAINFALL RECORD OF 3.16 INCHES SET IN 1962. FURTHERMORE...THIS 
RAINFALL BREAKS THE 24-HOUR RAINFALL RECORD OF 3.85 INCHES FOR JUNE 
SET IN 1982...AND BY ITSELF IS ALSO GREATER THAN THE PREVIOUSLY 
EXISTING MONTHLY RECORD OF 13.33 INCHES SET IN 1985. A NEW MONTHLY 
RAINFALL RECORD OF 31.97 INCHES HAS BEEN SET AS OF MIDNIGHT JUNE 
28...WITH THREE MORE DAYS REMAINING IN THE MONTH. 

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.

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
MU LUJAN ELEMENTARY
MACHANAONAO ELEMENTARY
ASTUMBO ELEMENTARY

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

$$

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, 10:05 PM CDT, 9 hours 55 minutes earlier.

Area forecast discussion, Jun 26, 10:05 PM CDT, 9 hours 55 minutes before

AREA SYNOPTIC DISCUSSION
NATIONAL WEATHER SERVICE TIYAN GU
1 PM GUAM LST SUN JUN 27 2004

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

TROPICAL STORM TINGTING...CENTERED NEAR 14N149E...IS MOVING
NORTHWEST AT 13 MPH WITH MAXIMUM SUSTAINED WINDS OF 60 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 TROPICAL STORM MINDULLE..LOCATED
NEAR 16N129E..EASTWARD THROUGH TINGTING TO 10N160E. MONSOON WINDS
ASSOCIATED WITH THIS TROUGH ARE PRODUCING SCATTERED SHOWERS BETWEEN
12N AND 20N FROM 157E TO 170E. THIS AREA INCLUDES WAKE ISLAND.

AN UPPER-LEVEL LOW CENTERED NEAR 30N170E IS GENERATING SCATTERED
SHOWERS AND ISOLATED THUNDERSTORMS NORTHEAST OF WAKE ISLAND BETWEEN
20N AND 25N FROM 162E TO 178E.

TRADE WIND CONVERGENCE IS GENERATING SCATTERED SHOWERS BETWEEN THE
EQUATOR AND 5N FROM 160E TO 180. THIS AREA INCLUDES KOSRAE.

The office that day

Everything else NWS Guam issued on the same UTC day.

Issued	Product	Office	Lasted
Jun 26, 9:25 PM CDT	Flash Flood Warning	GUM	5 hr
Jun 27, 2:00 AM CDT	Flash Flood Warning	GUM	6 hr
Jun 27, 2:00 PM CDT	Flash Flood Warning	GUM	10 hr

Nearby

Flash Flood Warnings in Guam, 2004 Every 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.