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ACPQ70 PGUM 190833 CCA
PSHGUM
POST TROPICAL CYCLONE REPORT...SUPER TYPHOON TRAMI (28W)...CORRECTED
NATIONAL WEATHER SERVICE TIYAN GU
430 PM CHST THU APRIL 18 2019
PRELIMINARY REPORT ON THE EFFECTS OF SUPER TYPHOON TRAMI (28W) IN
MICRONESIA FROM 17 TO 24 SEPTEMBER 2018.
IN MID-SEPTEMBER THE MONSOON TROUGH SAT IN A SW TO NE ORIENTATION,
SOUTH OF GUAM, STRETCHING BACK TO YAP IN THE WEST AND NORTHEAST OF
CHUUK IN THE EAST. BY THE 17TH AND 18TH OF SEPTEMBER, CONVECTION AND
THE ASSOCIATED SOUTHWEST MONSOON WIND FIELD STARTED ALIGNING WITH A
BROAD, PARTIALLY EXPOSED CIRCULATION NORTH OF 10N, BETWEEN 150E AND
153E. AS THE DISTURBANCE SLOWLY ADVANCED TOWARDS THE NORTHWEST, IT
SEEMED APPARENT THAT A MONSOON DISTURBANCE WAS ABOUT TO PASS THROUGH
THE SOUTHERN MARIANAS. IN ANTICIPATION OF THIS, A HYDROLOGIC OUTLOOK
FOR PRECIPITATION WAS ISSUED ON THE NIGHT OF THE 18TH INDICATING
THAT 'UP TO 20 INCHES' MAY FALL IN THE MARIANAS. AT THE TIME, DEEP
CONVECTION AND ANY WELL ORGANIZED LOW LEVEL WERE DIFFICULT TO SEE IN
THE CUMULUS FIELD OVER THE REGION OF THE BROAD MONSOON CIRCULATION,
SO MORE CONCERN EXISTED FOR WINDS (AND RAIN) THAT WERE AWAY FROM THE
CENTER, IN THE 'TAIL' OF THE SYSTEM. THERE WAS ALSO A CONCERN ABOUT
THE TAIL BUILDING BACK TOWARDS YAP AND THE REPUBLIC OF PALAU. BY THE
AFTERNOON OF THE 20TH, JUST SOUTHEAST OF GUAM, A LOW LEVEL SURFACE
CIRCULATION COULD FINALLY BE EASILY DISCERNED IN THE VISUAL IMAGERY,
AND IT WAS BECOMING APPARENT, AS VIEWED FROM THE GUAM RADAR, THAT
CONVECTION WAS STARTING TO FORM AROUND THE CENTER, ESPECIALLY ON THE
NORTH AND EAST SIDES. A TCFA WAS ISSUED BY JTWC AT 20SEP0900Z
(7PM)AS RADAR SHOWED THE PASSAGE, OF AT LEAST A MID-TROPOSPHERIC
CIRCULATION PASSING BETWEEN GUAM AND ROTA OVER NIGHT. WITH THE
BEGINNING OF WARNINGS FOR TD28W, A TROPICAL STORM WATCH WAS ISSUED
FOR ROTA, TINIAN, AND SAIPAN PRIMARILY IN CASE THE WINDS BUILT BACK
TO THE EAST FROM WHAT SEEMED LIKE A RAPIDLY DEVELOPING CIRCULATION.
IN FACT, WINDS GUSTS WERE REPORTED AS HIGH AS 41KT (47MPH) OVER BOTH
TINIAN AND SAIPAN AND WERE POSSIBLY STRONGER OVER ROTA (THE SUTRON
ON ROTA WAS INOPERABLE BECAUSE OF THE PASSAGE OF TY MANGHUT, JUST
THE WEEK PRIOR). LATER THAT DAY, ON 21 SEPTEMBER, ALL TS WATCHES
WERE CANCELLED WITH THE CONTINUED WESTWARD MOVEMENT OF THE TC. FOR
ABOUT 36 HOURS AFTER PASSING WEST OF ROTA, UPPER LEVEL SOUTHERLY
SHEAR CONTINUED TO EXPOSED THE LOW LEVEL CIRCULATION SOUTH OF THE TC
CENTER, WITH STRONGEST CONVECTION ALONG THE SOUTHEAST TO THE
NORTHWEST SIDE. HOWEVER, AFTER CROSSING 135E, THE VERTICAL SHEAR
RELAXED AND TRAMI BEGAN A RAPID INTENSIFICATION PHASE AND BECAME A
SUPER TYPHOON JUST PRIOR TO LEAVING GUAM AOR ON 24 SEPTEMBER.
RAINFALL DID NOT OCCUR QUITE AS HEAVY AS INITIALLY EXPECTED FOR THE
SOUTHERN MARIANAS (POSSIBLY DUE TO THE SPEED OF PASSAGE OF THE
SYSTEM); HOWEVER, RAINFALL AMOUNTS OF UP TO NINE INCHES WERE
REPORTED ON SAIPAN. IN ADDITION, FLOOD BULLETINS WERE STILL BEING
ISSUED FOR A DAY OR TWO AFTER PASSAGE THROUGH THE MARIANAS DUE TO
THE LINGERING OF THE 'MONSOON TAIL' OVER THE AREA.
A. LOWEST SEA LEVEL PRESSURE/MAX WINDS AND PEAK GUSTS
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METAR OBSERVATIONS...
NOTE: ANEMOMETER HEIGHT IS 10 METERS AND WIND AVERAGING IS 2 MINUTES
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LOCATION ID MIN DATE/ MAX DATE/ PEAK DATE/
LAT LON PRES TIME SUST TIME GUST TIME
DEG DECIMAL (MB) (UTC) (KT/MPH) (UTC) (KT/MPH) (UTC)
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PGUM 1003.1 20/0454 10-20 --- 31/36 21/0530
13.5N 144.8E NOTE: STRONGEST WINDS FROM THE SOUTHWEST AFTER CPA
PGSN 1007.0 20/0454 30/35 21/0244 41/47 21/0530
15.2N 145.8E NOTE: STRONGEST SUSTAINED WIND 10030/38KT
TINIAN SUTRON UNKNOWN 27/31 MSG 41/47 MSG
15.0N 145.6E
ROTA 29.65" 20/0450 26/30 20/2050 36/41 20/2050
14.1N 145.2E NOTE: LIMITED DATA,NO SUTRON
B. MARINE OBSERVATIONS...
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LOCATION ID MIN DATE/ MAX DATE/ PEAK DATE/
LAT LON PRES TIME SUST TIME GUST TIME
DEG DECIMAL (MB) (UTC) (KT) (UTC) (KT) (UTC)
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IPAN BUOY(121) NOT AVAILABLE
13.35N 144.79E
RITIDIAN BUOY(196) NOT AVAILABLE
13.68N 144.81E
C. STORM TOTAL RAINFALL
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LOCATION ID TIME PERIOD RAINFALL
LAT LON (IN)
DEG DECIMAL
---------------------------------------------------------------------
PGSN 6.61 INCHES (20-23 SEPT)
(UNCONFIRMED CAPITAL HILL, SAIPAN 9.16 INCHES)
PGUM 4.88 INCHES (20-23 SEPT)
TINIAN SUTRON 4.51 INCHES (24HR ON 20-21 SEPT)
ROTA UNKNOWN, BUT RADAR (PARTIALLY BLOCKED) SHOWED HEAVY RAIN
D. INLAND FLOODING...COASTAL EROSION REPORTED
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NO KNOWN IMPACTS...BUT RADAR SHOWED HEAVY RAIN OVER ROTA.
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E. MAXIMUM STORM SURGE AND STORM TIDE...
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LOCATION SURGE TIDE DATE/ BEACH
(FT) (FT) TIME EROSION
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NONE.
F. TORNADOES...
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LOCATION DATE/ EF SCALE
LAT LON (DEG DECIMAL) TIME(UTC) (IF KNOWN)
DESCRIPTION
---------------------------------------------------------------------
NONE.
G. STORM IMPACTS BY ISLAND...
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LOCATION DEATHS INJURIES EVACUATIONS
DESCRIPTION
---------------------------------------------------------------------
NO KNOWN IMPACTS.
H. ADDITIONAL REMARKS...
ISSUED BY JTWC:
18SEP0600Z (4PM CHST) LOW, 10N 153E (92W)
19SEP1800Z (4AM CHST), LOW, 12.7N 147.4E, 20 KT
20SEP0900Z (7PM CHST) TCFA 1ST
20SEP2100Z (21SEP 7AM CHST) TD 28W (1ST WARNING), 13.8N 145.1E (JUST
SOUTHWEST OF ROTA)
21SEP00900Z (7PM CHST) TROPICAL STORM (JTWC) 15.0N 143.4E
21SEP1200Z (10PM CHST) TROPICAL STORM TRAMI (JMA)
22SEP2100Z (23 SEP, 7AM CHST) TYPHOON TRAMI,17.0N 135.0E
23SEP1500Z (24 SEP, 1AM CHST) MAJOR TYPHOON (>100KT)
24SEP0900Z (7PM CHST) SUPER TYPHOON TRAMI, 19N 130.0E, OUTSIDE GUM AOR
01OCT0900Z (1OOCT 7PM CHST) FINAL WARNING BY JTWC, 43N 150E
BULLETINS ISSUED BY WFO GUAM (PGUM):
19SEP2311Z (9:11AM CHST), SPSPQ FOR KOROR, YAP, AND CHUUK STATE
AS PART OF AN ACTIVE MONSOON, SOUTH OF TROUGH AXIS
20SEP0903Z (7:03PM CHST) SPSMY FOR MARIANAS CONCERNING THE TCFA
20SEP0923Z (7:23PM CHST), UPDATED SPSPQ (DROPPED CHUUK STATE)
20SEP2139Z (21SEP, 7:39AM CHST), TCPPQ1,#1
TS WATCH: ROTA, TINIAN, SAIPAN
21SEP0900Z (7:00PM CHST), CANX TS WATCH FOR ALL STATIONS
22SEP0030Z (10:30AM CHST), SPSPQ FOR YAP AND PALAU (WINDS/RAIN)
24SEP0924Z (7:24PM CHST), LAST TCPPQ1...TC OUT OF AOR, 20N130E
SUMMARY OF TC-RELATED BULLETINS:
15 - TCP - PUBLIC ADVISORIES
2 - TCP - INTERMEDIATE PUBLIC ADVISORY
4 - HLS - TYPHOON LOCAL STATEMENTS
7 -TCU - TC UPDATES (RADAR POSITIONS)
5 - SPS - SPECIAL WEATHER STATEMENTS PRIMARILY FOR THE ISLANDS IN
CHUUK, YAP AND REPUBLIC OF PALAU (4) AND MARIANAS (1)
SUMMARY OF SPECIAL HYDROLOGIC, SURF, AND MARINE PRODUCTS:
18SEP1554Z (19SEP 1:54AM CHST) HYDROLOGIC OUTLOOK (ESFMY)
PRECIP UP TO 20 INCHES AS PART OF A DISTURBANCE AND
MONSOON TROUGH
19SEP1451Z (20SEP,00:51AM CHST)REISSUED ESFMY, UPDATED
20SEP0758Z (5:58PM CHST) FLASH FLOOD WATCH FOR MARIANAS (FFAMY)
20SEP1741Z (21SEP,3:41AM CHST),SMALL CRAFT ADVISORY FOR MARIANAS, MWWGUM
21SEP0050Z (1050 AM CHST), FLASH FLOOD WARNING FOR ROTA (FFWMY)
22SEP0302Z (1:02PM CHST), URBAN AND SMALL STREAM, GUAM,)FLSMY
22SEP0735Z (5:35PM CHST), FLASH FLOOD WATCH EXTENDED, FFAMY
$$
EDSON