Guam, 2014

Tropical Storm in Guam, July 29 to 31, 2014

July 29 to 31, 2014 · NWS GUM · 1 event in 1 county or zone

Tropical Storm Halong brings winds and rain to the Marianas.

The toll

Deaths
0
Injuries
0
Property damage
$1.0 million
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 GUM wrote it up.

Tropical Storm Halong brings winds and rain to the Marianas.

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 Guam wrote its last area forecast discussion before the first event at Jul 28, 1:50 PM UTC, 10 minutes earlier.

Area forecast discussion, Jul 28, 1:50 PM UTC, 10 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TIYAN GU
1150 PM CHST MON JUL 28 2014

.MARIANAS SYNOPSIS...
PGUA WSR-88D SHOWS SCATTERED SHOWERS MOVING THROUGH THE MARIANAS
WATERS...MAINLY IN THE GUAM AND ROTA WATERS. THE VAD WIND PROFILE
REVEALS 16 TO 28 KNOT WEST MONSOON WINDS THROUGH THE LOWEST 10
THOUSAND FEET OF THE AIR.

&&

.DISCUSSION...
MONSOON FLOW CONTINUES AND WILL MAKE OUR WEATHER IN GENERAL
CLOUDIER AND MORE SHOWERY THAN USUAL. AN ADDITIONAL WRINKLE IS A
KNOT DEVELOPING IN THE MONSOON FLOW...A TROPICAL DISTURBANCE
NORTH-NORTHWEST OF CHUUK. THIS WILL BE THE MAJOR PLAYER IN THE
FORECAST THE NEXT FEW DAYS. ALL WILL DEPEND ON HOW THIS SUSTEM
EVOLVES AND EXACTLY WHERE IT TRACKS.

&&

.MARINE...
SEAS DIPPED FOR A BIT BUT HAVE COME BACK WITH A VENGEANCE.
COMBINED SEAS ARE AROUND 7 TO 9 FEET...JUST SHORT OF A SMALL
CRAFT ADVISORY. WITH A PERIOD OF 9 TO 10 SECONDS...IT IS
SUFFICIENT FOR A HIGH SURF ADVISORY SO WILL MAINTAIN THIS.

&&

.TROPICAL SYSTEMS...
THE TROPICAL DISTURBANCE NORTH-NORTHWEST OF CHUUK REMAINS THE
SUBJECT OF A TROPICAL CYCLONE FORMATION ALERT FROM THE JOINT
TYPHOON WARNING CENTER. A DEVELOPING CELL OF THE TROPICAL UPPER
TROPOSPHERIC TROUGH IN THE FAR NORTHERN MARIANAS WILL DOUBTLESS
INTERACT WITH IT...WHETHER IT IS A HELP OR A HINDRANCE REMAINS TO
BE SEEN. THE ECMWF-HIRES BRINGS IT THROUGH THE MARIANAS AS A 25
KNOT TROPICAL DEPRESSION...WHICH WOULD BE NO BIG DEAL. THE GFS40
HOWEVER BRINGS IT IN AS A HIGH-END TROPICAL STORM. BASED ON THE
LIMITED TIME FOR DEVELOPMENT BEFORE IT COMES THROUGH...WE ARE
CURRENTLY FAVORING THE ECMWF SOLUTION.

&&

.EASTERN MICRONESIA...
A WEAK MONSOON TROUGH RUNS SOUTHEASTWARD FROM A TROPICAL
DISTURBANCE CENTERED NORTHWEST OF CHUUK NEAR 12N150E TO A WEAK
CIRCULATION CENTERED NEAR KOSRAE AT 3N162E...THEN MEANDERS EAST-
NORTHEASTWARD ACROSS THE MARSHALL ISLANDS TO BEYOND THE DATE LINE
AT 8N. GENTLE WINDS NEAR THE TROUGH AXIS WILL CONTINUE TO PROMOTE
FAIR WEATHER ACROSS BOTH POHNPEI AND KOSRAE THRU TUESDAY. FOR
MAJURO...SLIGHTLY STRONGER CONVERGING WINDS ALONG THE TROUGH AXIS
COULD TRIGGER A FEW SHOWERS UNTIL TUESDAY EVENING. AS THE TROPICAL
DISTURBANCE SLOWLY TRACKS WEST-NORTHWESTWARD TOWARD THE MARIANA
ISLANDS ON WEDNESDAY... THE MONSOON TROUGH WILL ALSO LIFT
NORTHWARD AWAY FROM THE REGION. THIS WILL ALLOW LIGHT WINDS SOUTH
OF THE TROUGH TO PROLONG FAIR CONDITIONS ACROSS POHNPEI AND
KOSRAE...AND ALSO INTRODUCE IT TO MAJURO. THE LEADING EDGE OF A
FRESH TRADE-WIND SURGE IS VISIBLE ON THE LATEST ASCAT SATELLITE
IMAGERY EAST OF THE DATE LINE NEAR 165W. AS THIS SURGE CROSSES THE
DATE LINE INTO EASTERN MICRONESIA NEAR MIDWEEK...IT COULD DISPLACE
THE REMNANTS OF THE MONSOON TROUGH SOUTHWARD CLOSER TO THE MAJOR
ISLANDS AND ATOLLS. THIS SURGE COULD ALSO TRANSFORM IT INTO A
TRADE CONVERGENCE BOUNDARY AND CAUSE WET WEATHER FOR ALL THE
LOCATIONS AFTER MIDWEEK.

MONSOONAL WEST SWELL HAS DECLINED ENOUGH TO ALLOW SURF ACROSS
POHNPEI STATE TO DROP BELOW HAZARDOUS LEVELS TODAY.
&&

.WESTERN MICRONESIA...
THE TROPICAL DISTURBANCE AND ASSOCIATED MONSOON TROUGH IS GRADUALLY
LIFTING NORTHWARD AWAY FROM CHUUK STATE THIS EVENING. RESIDUAL
CONVERGING WEST TO SOUTHWEST WINDS CAN STILL SPARK OFF A FEW
THUNDERSTORMS THRU TUESDAY AFTERNOON. BY TUESDAY NIGHT...A SURFACE
HIGH WILL BUILD NORTHWARD OVER THE ISLAND AND BRING DRY WEATHER THRU
FRIDAY. DURING THE WEEKEND...CONVERGING TRADE WINDS FILTERING
WESTWARD FROM THE EAST COULD INCREASE THE CHANCE OF SHOWERS.
MONSOONAL WEST SWELL IS GOING TO SUBSIDE FURTHER TONIGHT WHICH
SHOULD CAUSE SURF ACROSS CHUUK STATE TO FALL BELOW ADVISORY LEVELS
ON TUESDAY.

A MONSOONAL DISTURBANCE EMBEDDED ALONG THE MONSOON TROUGH CONTINUE
TO MOVE NORTHWARD ACROSS THE PHILIPPINE SEA AWAY FROM THE REPUBLIC
OF PALAU AND YAP STATE. THE SOUTHERN EDGE OF THE RETREATING MONSOON
SURGE FEEDING INTO THIS DISTURBANCE WILL KEEP PERIODIC SHOWERS AND
THUNDERSTORMS NEAR YAP THRU TUESDAY...AND GUSTY WINDS FOR BOTH KOROR
AND YAP UNTIL TUESDAY EVENING. BY TUESDAY NIGHT...BOTH WIND AND
WEATHER SHOULD CALM DOWN FOR BOTH LOCALES AS A SURFACE RIDGE TAKES
CONTROL OF THE AREA. THE TROPICAL DISTURBANCE CURRENTLY NORTHWEST OF
CHUUK NEAR 12N150E IS EXPECTED TO PUSH ACROSS THE MARIANA ISLANDS
INTO THE PHILIPPINE SEA BY WEDNESDAY EVENING. UNDER THIS SCENARIO...
THIS SYSTEM COULD ACTIVATE ANOTHER MONSOONAL PATTERN ALONG WITH
UNSTABLE WEATHER OVER PALAU AND YAP AFTER MIDWEEK.

LINGERING MONSOONAL SWELL WILL MAINTAIN HAZARDOUS SEAS FOR SMALL
CRAFT UNTIL TUESDAY NIGHT...AND HIGH SURF THRU WEDNESDAY FOR THE
REPUBLIC OF PALAU AND YAP STATE.

&&

.GUM WATCHES/WARNINGS/ADVISORIES...
GU...HIGH SURF ADVISORY UNTIL 6 PM CHST THURSDAY FOR GUZ001>004.

MARIANAS WATERS...NONE.
&&

STANKO/CHAN

Event by event

1 tropical storm. Local standard time, as filed.

Tropical Storm, Guam

When
July 29, 12:00 AM GST to July 31, 12:00 AM GST
Where
Guam forecast zone
Property damage
$1.0 million
Reported by
Newspaper

Tropical Depression 11W formed to the to the east-southeast of Guam on the morning of the 29th of July. By the afternoon of the same day the depression intensified into Tropical Storm Halong.

The tropical storm passed through the Rota Channel during the afternoon the 30th. The center of the tropical storm passed around 10 miles south of Rota. During the 30th, winds gusted to 53 mph at the National Weather Service office in Guam. On the same day an automated weather observing station in Apra Harbor, Guam reported |a gust to 61 mph.

The tropical storm was also associated with heavy rainfall across the Mariana Islands. This rainfall caused flooding in some areas. Between the night of the 27th to the night of the 31st, the NWS office recorded 14.53 inches of rain. 12.99 inches of rainfall were recorded at Windward Hills in central Guam during those three days.

The winds and rains also caused sporadic power outages across the island of Guam. These same winds and rain caused trees to be uprooted across Guam.

On the 30th, during the height of the storm, a 49-foot Japanese fishing vessel, the Take Maru 55, went aground on the west side of Cocos Island (southern Guam) with six crew members aboard. The crew members had to swim to Cocos Island to seek shelter from the effects of Tropical Storm Halong. On Cocos island they sheltered in one of the buildings at the Cocos Island Resort. There were no reports of injuries to any of the personnel. The six individuals were picked up and later transported to Guam.

The swells also pushed a dead 38-foot, 20-ton Baleen whale ashore on the shores of Agat on August 2nd. The Guam Department of Agriculture biologist, Brent Tibbatts, concluded that the whale simply died of old age and was washed ashore by the tides.|He based his assessment on the whale's size and lack of obvious injuries or disease.

What these are

Tropical Storm
A tropical cyclone with sustained winds of 34 to 63 knots (39 to 73 mph).

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

The same day elsewhere

More

Every storm in Guam in 2014Every state in 2014This day in weather historyWarnings in Guam, July 2014The 2014 hurricane season

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: 538420.