WRD/TC.40/2

In the United States of America,

Weather Forecast Office (WFO) Guam, Micronesia, Western North Pacific

1. General Information: WFO Guam issues Tropical Storm and Typhoon Watches and Warnings for 37 islands in Micronesia. A Tropical Storm Watch indicates that tropical storm-force winds (34 to 63 kt, 1-minute average sustained wind) are possible within the next 48 hours. A Tropical Storm Warning means that tropical storm-force winds are expected in the next 24 hours or are occurring. A Typhoon Watch means that typhoon conditions (sustained winds of 64 kt or more) are possible generally within 48 hours. A Typhoon Warning means that typhoon force winds of 64 kt or more are expected generally in the next 24 hours. For Typhoon Watches and Warnings, the actual timing is based on the arrival of the 34-kt winds.

Table 1. Tropical Cyclones affecting Micronesia from Oct 2006 to Sept 2007.

Name DateIsland(s) affected

(WFO Guam Issued Watches and Warnings)

0622 / TY Soulik (21W) / 06 - 14 Oct 2006 / TS Warning northern CNMI (Pagan, Agrihan and Alamagan)
0621 / STY Durian (24W) / 24 – 28 Nov 2006 / TS Warning Yap , Ngulu, Fais and Ulithi (Yap State)
0701 / TY Kong-rey (01W) / 26 Mar-05 Apr 2007 / TY Warning Guam and CNMI ( Tinian, Saipan, Pagan, Agrihan and Alamagan)
0702 / TY Yutu (02W) / 12 – 21 May 2007 / TS Warning – Koror and Kayangel (Rep of Palau), TS Watch for Sonsorol (YapState)
0704 / STY Man-yi (04W) / 06 – 11 Jul 2007 / TS Warning – Koror and Kayangel (Rep of Palau), TS Watch for Sonsorol (YapState)
0705 / TY Usagi (05W) / 26 – 31 Jul 2007 / TS Warning CNMI (Rota, Tinian and Saipan) Pagan, Agrihan and Alamagan

(WFO Guam Issued Public Advisories and Special Weather Statements)

0619 / STY Cimaron (19W) / 25-27 Oct 2006 / Guam, CNMI and YapState
0622 / TY Utor (25W) / 06-08 Dec 2006 / Yap and Palau
0623 / TS Trami (26W) / 15 – 08 Jul 2006 / Chuuk, Guam, Rota, Ulithi and Yap
0706 / TY Pabuk (07W) / 04 – 06 Aug 2007 / Only Public Advisories
0708 / STY Sepat (08W) / 11 – 14 Aug 2007 / Only Public Advisories
0709 / TY Fitow (10W) / 26 – 30 Aug 2007 / Only Public Advisories
0711 / ST Nari (12W) / 10-14 Sep 2007 / Only Public Advisories
------/ TD 14W (14W) / 19-22 Sep 2007 / YapIsland affected by strong pre-disturbance winds and rain.

(Passed AOR as a Tropical Disturbance or Affected AOR Indirectly)

0620 / TY Chebi (23W) / Nov 2006
0707 / TS Wutip (24W) / Aug 2007
0712 / STY Wipha (13W) / Sep 2007

a)

b)

Figure 2. Tracks of Tropical Cyclones (TC) affecting Micronesia during the Oct 2006 to September 2007 Season (partial tracks shown). All but two TC tracks occurred over the western portion of the AOR. Times shown are for the period when the TC was within the AOR. Approximate location of development as a Tropical Depression, Tropical Storm and Typhoon are also shown. Maximum intensity (1-minute sustained wind) within the AOR are as indicated.

2. Significant or unusual events.

  • Typhoon Soulik (21W). WFO Guam issued 14 Public Advisories on Typhoon Soulik as it threatened and affected the Commonwealth of the Northern Mariana Islands (CNMI) as a tropical storm. In addition, the WFO issued a Tropical Storm Watch, a Tropical Storm Warning, and six Local Statements for the Island of Agrihan located near 19N146E (including neighboring islands of Pagan and Alamagan) in the CNMI. These are high volcanic islands and residents live away from the coastline. The Watch had 33 hours of lead time, but a rapid increase in the speed of motion and a doubling of the radius of 39-mph winds resulted in only 4 hours of lead time on the warning. The small number of resident received the warning via HF radio and had enough time to prepare. There were no injuries or significant damages on the islands. Most structures were rebuilt after several 2004 typhoons and are relatively strong. Peak measured winds on Pagan Island HANDAR (18N146E) were gusts to 76 mph.
  • Typhoon Kong-Rey (01W). The first tropical cyclone in the western North Pacific created the only typhoon warning or watch condition for the southern Marianas...including Guam. Fortunately, the typhoon passed sufficiently north of the islands to keep the damaging winds away from the area. North of the center, winds measured on Pagan reached a peak of 67 kt, however no significant damage or flooding was noted at any island. In total, WFO Guam issued 26 public advisories and two special weather statements.
  • Super Typhoon Man-Yi (04W). The fourth tropical cyclone in the western North Pacific, Super Typhoon Man-yi, developed south of Guam from 7 to 10 July. Tropical storm and Typhoon watches and warnings were issued for the islands of Yap state and Chuuk state in the Federated States of Micronesia. These included Satawal, Woleai, Faraulep, Fais and Ulithi. No serious injuries/deaths or damages were reported on these islands. Maximum wind received at WSO Yap was 49 mph. A strong gradient over Guam produced gale force winds in the immediate area. WFO Guam issued Gale Warnings, Wind Advisories, and High Surf Warnings for Guam and the Marianas.
  • Typhoon Usagi (05W). The fifth tropical cyclone in the western North Pacific, Typhoon Usagi, developed east of the Marianas and passed through the Northern Marianas on 29 July. Tropical storm watches and warnings were issued for the northern islands of the Marianas including Agrihan, Pagan, and Alamagan from 29 July to 30 July. Usagi intensified to Typhoon Usagi on the morning of the 30th and continued to head out of the Guam area of responsibility. Closest point of approach was roughly 30 miles north of Agrihan and 50 miles north of Pagan. Maximum gust recorded at Pagan was 48 mph on Sunday morning. No serious injuries/deaths or damages were reported.

II. Regional Specialized Meteorological Centre (RSMC) Honolulu / Weather Forecast Office (WFO) Honolulu

  1. Typhoon that Impacted TC Members

NTR.