Alert archive / Guam / Flash Flood Warnings in 2004

Flash Flood Warning 8, NWS Guam

August 22, 2004

NWS Guam issued this flash flood warning at Aug 22, 2004, 2:00 AM CDT. It was in force for 13 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: Aug 22, 2004, 2:00 AM CDT (07:00 UTC)
Expired: Aug 22, 2004, 3:00 PM CDT
In force: 13 hr
Issued by: NWS Guam
Area: Whole counties

The text

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

000 
WGMY50 PGUM 220656
FFWMY 
GUZ001-002-003-004-222000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TIYAN GU
5 PM LST SUN AUG 22 2004

THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE MARIANA ISLANDS OF GUAM...ROTA...TINIAN AND SAIPAN.

* UNTIL 600 AM LST MONDAY MORNING.

* AT 5 PM LST...SATELLITE AND DOPPLER WEATHER RADAR IMAGERY   
  INDICATE INTENSE RAIN BANDS SWIRLING INTO TYPHOON CHABA. THESE 
  RAIN BANDS WILL CONTINUALLY FORM OVER THE MARIANA ISLANDS AS CHABA 
  MAKES ITS CLOSEST APPROACH TONIGHT. 

* TYPHOON CHABA HAS ALREADY BROUGHT AROUND 3 INCHES OF RAIN TO MOST 
  OF THE MARIANAS AND MAY RAISE RAINFALL TOTALS TO NEAR 12 INCHES BY 
  EARLY MONDAY MORNING.

* EXPECT FLASH FLOODING TO OCCUR 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.

$$
PRIOR

1 follow-up statement

000 
WGMY70 PGUM 221854
FFSMY 
GUZ001-002-003-004-222200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TIYAN GU
5 AM LST MON AUG 23 2004

...THE FLASH FLOOD WARNING FOR GUAM...ROTA...TINIAN AND SAIPAN IS 
CANCELLED AS OF 5 AM...

...A FLOOD WATCH REMAINS IN EFFECT FOR GUAM...ROTA...TINIAN AND 
SAIPAN UNTIL 4 PM TODAY.

AT 5 AM...THE GUAM DOPPLER WEATHER RADAR INDICATES WIDESPREAD 
LIGHT RAIN ACROSS THE MARIANA ISLANDS WITH ONE-HOUR RAINFALL RATES 
MOSTLY LESS THAN 0.20 INCHES PER HOUR. 

RAIN BANDS TO THE EAST MAY PASS THROUGH THE ISLANDS TODAY...CAUSING 
MORE EPISODES OF FLOODING. IN THIS EVENT...ANOTHER FLOOD WARNING MAY 
BE NEEDED.

HERE ARE PRELIMINARY STORM TOTALS SINCE MIDNIGHT SUNDAY...

GUAM INTL AIRPORT/TIYAN......... 8.70 INCHES
APRA HARBOR (AUTOMATED GAUGE)... 5.47 INCHES
INARAJAN (AUTOMATED GAUGE)...... 7.53 INCHES
MANGILAO (AUTOMATED GAUGE)...... 5.05 INCHES
MALESSO (AUTOMATED GAUGE)........5.45 INCHES

ROTA INTL AIRPORT/SINAPALU...... 12.00 INCHES
SAIPAN INTERNATIONAL AIRPORT.... 8.47 INCHES

$$
PRIOR/GUARD

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 Aug 21, 10:12 PM CDT, 3 hours 48 minutes earlier.

Area forecast discussion, Aug 21, 10:12 PM CDT, 3 hours 48 minutes before

AREA SYNOPTIC DISCUSSION
NATIONAL WEATHER SERVICE TIYAN GU
1 PM GUAM LST SUN AUG 22 2004

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

TYPHOON CHABA IS CENTERED ABOUT 150 MILES EAST-NORTHEAST OF GUAM
NEAR 14N147E AND IS MOVING WEST AT 16 MPH WITH MAXIMUM SUSTAINED
WINDS OF 110 MPH. HEAVY RAIN AND THUNDERSTORMS EXTEND OUTWARD UP TO
300 MILES FROM THE CENTER. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS EXTEND FURTHER OUT TO AN AREA BETWEEN 10N AND 17N FROM
142E TO 152E. SEE NWS PUBLIC ADVISORY WTPQ32 PGUM AND JOINT TYPHOON
WARNING CENTER BULLETIN WTPN32 PGTW FOR FURTHER DETAILS.

TYPHOON AERE IS CENTERED NEAR 20N130E AND IS MOVING NORTHWEST AT 11
MPH WITH MAXIMUM SUSTAINED WINDS OF 75 MPH. HEAVY RAIN AND
THUNDERSTORMS EXTEND OUTWARD UP TO 200 MILES FROM THE CENTER.
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS EXTEND WESTWARD FROM
132E BETWEEN 15N AND 22N SEE JOINT TYPHOON WARNING CENTER BULLETIN
WTPN33 PGTW FOR FURTHER DETAILS.

A MONSOON TROUGH STRETCHES FROM TYPHOON AERE TO TYPHOON CHABA TO A
WEAK CIRCULATION JUST WEST OF KWAJALEIN NEAR 8N163E THEN
SOUTHEASTWARD TO TO 5N168E. CONVERGENT WINDS SOUTH OF OF THE TROUGH
WELL TO THE EAST OF TYPHOON CHABA ARE PRODUCING SCATTERED SHOWERS
AND ISOLATED THUNDERSTORMS BETWEEN 7N AND 16N FROM 152E TO 168E.
THIS AREA INCLUDES POHNPEI...KOSRAE AND ENEWETAK.

CONVERGENT TRADE WINDS ARE GENERATING SCATTERED SHOWERS IN THE
REPUBLIC OF THE MARSHALL ISLANDS BETWEEN 2N AND 13N FROM 168E TO
180. THIS AREA INCLUDES MAJURO.

The office that day

Everything else NWS Guam issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 21, 9:00 PM CDT	Flash Flood Warning	GUM		3 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.