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as a tropical storm on April 12. While passing near the island, the storm produced moderate winds across the island, peaking at 95 km/h (60 mph). The winds downed several trees and tree limbs which destroyed 40% of the island's power lines. A few buildings reported roof damage. About 15% of
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Shortly after peaking in intensity, Isa began to weaken, and by April 21 it dropped below "super typhoon" status. It accelerated to the northeast under the flow of the mid-latitudes, and the typhoon weakened more rapidly; JMA downgraded Isa to a tropical storm on April 22, which was followed suit by
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to its north, Isa tracked to the north and gradually curved to the west. It slowly intensified, due to it being a large tropical cyclone, and late on April 13 JTWC upgraded the storm to typhoon status; at the same time, JMA continued to assess Isa as a minimal tropical storm, and did not upgrade it
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stalled across the island, which dropped heavy rainfall of 15–25 cm (6–10 in) across the island. The rainfall was welcome as it occurred during the dry season, and largely contributed to rainfall at the Guam
International Airport being 45% above normal from the period between January
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in a political asylum to the mainland of the United States. The threat of the typhoon also canceled the first round of the Omega Tour golf event, which was the second professional golf tournament in the island's history. Though
Typhoon Isa passed well to the south of Guam, one of its outer
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on April 9, and resembled the characteristics of a monsoon depression. Shortly thereafter, a large, yet weak low-level circulation formed within the system. The system drifted erratically for several days as it slowly organized; the system underwent several cycles of developing and losing
588:; the winds resulted in sporadic power outages across the island. The typhoon caused some light damage to buildings, particularly on the south side of the island. The combination of winds and sea salt caused damage to the island's tomato, okra, cucumber, and soybean crops.
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anticipated a quick turn to the north. The JTWC recognized the northward model bias, which was described as under-analyzing the strength of the subtropical ridge. By April 16, the typhoon attained the equivalence of a
Category 3 tropical cyclone on the
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the typhoon remained 260 km (160 mi) south of the island. It gradually curved to the north, and on April 20 JTWC classified Super
Typhoon Isa as reaching peak 1-min winds of 270 km/h (170 mph). At this point, Isa became an
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left the depression drifting and slowly executing a loop to the northwest. Based on sufficient satellite classifications, JTWC upgraded the depression to
Tropical Storm Isa early on April 12 while it was located 105 km (65 mi) of
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declared
Pohnpei as a major disaster area due to the damage from Typhoon Isa and subsequent flooding; on April 20 heavy rainfall caused widespread mudslides and 19 fatalities on the island, though they were not related to Isa.
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increased. At 0600 UTC on April 23, the JTWC issued the last advisory on the system, and the next day JMA classified Isa dissipated as it became absorbed by a cloud band from a large
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area of responsibility totaled $ 1 million (1997 USD$ , 1.9 million 2024 USD), the majority of it from crop damage. No deaths were reported.
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595:. Across its path, damage from the storm totaled over $ 1 million (1997 USD, $ 1.9 million 2024 USD). No deaths or injuries were reported.
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to its north. Isa very gradually intensified, and on April 20 the typhoon reached peak 1-min winds of 270 km/h (170 mph), as reported by the
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reported maximum 10-min winds of 155 km/h (95 mph). After turning northward, it accelerated to the northeast, and merged with a larger
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454:. On April 11, the system maintained a persistent area of well-organized deep convection, and subsequent to an increase in upper-level
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475:(JMA) simultaneously classified the system as a tropical depression and upgraded it to a tropical storm early on April 13.
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the crops on
Pohnpei were damaged, including losses to the banana and breadfruit crops. After the passage of the typhoon,
462:(JTWC) classified the system as Tropical Depression 02W at 1800 UTC on April 11. Strong influence from the monsoonal
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on April 12. It moved erratically at first, though after attaining tropical storm status it curved westward due to the
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through April. The rainband also produced wind gusts that reached 86 km/h (53 mph) at the island's
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Agence France Presse (1997-04-18). "China's Wu
Xiangbing and Taiwan's Tsai Chi-huang over".
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Agence France Presse (1997-04-16). "Typhoon Isa looks likely to bring havoc to the start".
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to a typhoon until April 16. Isa maintained a nearly due-westward movement, although
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Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
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This article is about the 1997 typhoon. For other storms of the same name, see
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Office of the
Assistant Secretary of Defense (Public Affairs) (1997-04-15).
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Early in its duration, Isa caused light rainfall and moderate winds on
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795:"Nena Declared Pohnpei Disaster, Asked President Clinton Likewise"
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Federated States of
Micronesia Information Service (1997-04-25).
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559:, the threat of Typhoon Isa postponed a flight from Guam to
445:. An area of convection within the trough developed in the
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Tropical storm (39–73 mph, 63–118 km/h)
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Tropical depression (≤38 mph, ≤62 km/h)
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Typhoon Isa later dropped light rainfall on the island of
425:, remnant low, tropical disturbance, or monsoon depression
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Category 4 (130–156 mph, 209–251 km/h)
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Category 3 (111–129 mph, 178–208 km/h)
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Category 2 (96–110 mph, 154–177 km/h)
362:
Category 1 (74–95 mph, 119–153 km/h)
889:"Pacific ENSO Update - 2nd Quarter 1997 - Vol. 3 No. 2"
842:"Operation Pacific Haven Wraps Up Humanitarian Efforts"
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of the season, Isa developed from a disturbance in the
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Category 5 (≥157 mph, ≥252 km/h)
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891:. National Oceanic and Atmospheric Administration.
816:"Storm delays last flight of 300 Kurds from Guam"
310:from the typhoon dropped heavy precipitation on
546:President of the Federated States of Micronesia
563:for 48 hours. The flight was the last in
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8:
501:, with a large eye and a lack of spiralform
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958:
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908:of Typhoon Isa (9701) from Digital Typhoon
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58:Typhoon Isa at peak intensity on April 20
1428:Typhoons in the Northern Mariana Islands
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818:. Honolulu Star-Bulletin. Archived from
638:- The strongest tropical cyclone in the
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767:National Climatic Data Center (1997).
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509:the JTWC the next day as upper-level
314:during its dry season. Damage in the
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146:Category 5-equivalent super typhoon
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736:"Tropical Storm Jimmy (03W) ATCR"
710:"1997 Western Pacific Best Track"
621:List of notable tropical cyclones
263:was the first of a record eleven
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912:JMA Best Track Data (Graphics)
675:"Super Typhoon Isa (02W) ATCR"
490:Saffir-Simpson Hurricane Scale
1:
844:. U.S. Department of Defense
460:Joint Typhoon Warning Center
289:Joint Typhoon Warning Center
171:270 km/h (165 mph)
119:155 km/h (100 mph)
1418:1997 Pacific typhoon season
968:1997 Pacific typhoon season
814:Staff Writer (1997-04-16).
473:Japan Meteorological Agency
293:Japan Meteorological Agency
269:1997 Pacific typhoon season
252:1997 Pacific typhoon season
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932:of Super Typhoon 02W (Isa)
918:JMA Best Track Data (Text)
437:established itself across
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966:Tropical cyclones of the
529:Typhoon Isa visible from
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613:Tropical cyclones portal
319:National Weather Service
40:List of storms named Isa
31:Not to be confused with
906:JMA General Information
887:Alan C. Hilton (1998).
769:"Event Report for Guam"
565:Operation Pacific Haven
27:Pacific typhoon in 1997
636:Typhoon Surigae (2021)
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517:to the east of Japan.
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325:Meteorological history
306:. Later, a stationary
65:Meteorological history
914:of Typhoon Isa (9701)
631:Typhoon Maysak (2015)
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515:extratropical cyclone
423:Extratropical cyclone
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297:extratropical cyclone
923:JTWC Best Track Data
626:Typhoon Mitag (2002)
433:In early April, the
344:Saffir–Simpson scale
267:to occur during the
176:Lowest pressure
124:Lowest pressure
640:Northern Hemisphere
539:Isa first affected
413:Subtropical cyclone
105:10-minute sustained
98:Very strong typhoon
48:
928:2013-10-05 at the
642:to form before May
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168:Highest winds
153:1-minute sustained
116:Highest winds
18:Typhoon Isa (1997)
1433:April 1997 events
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586:Naval Air Station
480:subtropical ridge
285:subtropical ridge
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16:(Redirected from
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820:the original
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249:Part of the
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261:Typhoon Isa
47:Typhoon Isa
1412:Categories
848:2007-04-26
826:2007-04-26
800:2007-04-26
779:2007-04-26
746:2007-04-20
720:2007-04-15
685:2007-04-25
647:References
549:Jacob Nena
511:wind shear
464:westerlies
452:convection
439:Micronesia
393:Storm type
202:Fatalities
89:Dissipated
581:rainbands
503:rainbands
478:With the
441:near the
279:near the
1395:Category
926:Archived
599:See also
387:Unknown
308:rainband
541:Pohnpei
469:Pohnpei
456:outflow
443:equator
337:Map key
304:Pohnpei
237:IBTrACS
222:Pohnpei
1281:Ginger
1269:Hannah
1149:Winnie
1137:Victor
1065:Nestor
993:Hannah
534:NEXRAD
521:Impact
471:. The
458:, the
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210:Damage
71:Formed
1353:Linda
1341:Keith
1245:David
1233:Oliwa
1197:Amber
1113:Scott
1101:Rosie
1089:Peter
1053:Marie
1029:Kelly
1017:Jimmy
576:Kurds
572:]
157:SSHWS
1377:Paka
1372:VSTY
1365:Mort
1336:VITY
1329:Joan
1324:VITY
1317:Ivan
1312:VITY
1305:Hank
1276:VSTY
1257:Ella
1240:VSTY
1228:VSTY
1221:Cass
1209:Bing
1204:VSTY
1185:Zita
1161:Yule
1144:VSTY
1125:Tina
1096:VSTY
1077:Opal
1060:VSTY
1041:Levi
1000:VSTY
593:Rota
557:Guam
531:Guam
494:Guam
316:Guam
312:Guam
230:Rota
226:Guam
190:inHg
186:mbar
180:930
161:JTWC
138:inHg
134:mbar
128:940
1348:STS
1293:26W
1264:STS
1180:STS
1173:16W
1156:STS
1132:STS
1005:Isa
555:In
182:hPa
130:hPa
109:JMA
1414::
1360:TS
1300:TD
1288:TD
1252:TD
1216:TS
1192:TY
1168:TD
1120:TY
1108:TS
1084:TY
1072:TY
1048:TY
1036:TS
1024:TS
1012:TS
988:TD
879:^
755:^
694:^
655:^
570:de
291:;
228:,
224:,
959:e
952:t
945:v
851:.
829:.
803:.
782:.
749:.
723:.
688:.
205:0
184:(
163:)
159:/
155:(
132:(
111:)
107:(
42:.
35:.
20:)
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