Subtropical Storm 60W
Page Template:Infobox weather event/style.css has no content.
 The cyclone showing tropical or subtropical characteristics late on November 7, 2006 | |
| Meteorological history | |
|---|---|
| Formed | November 2, 2006 |
| Dissipated | November 11, 2006 |
| Meteorological information | |
| 10-minute sustained | |
| Highest winds | 85 km/h (50 mph) |
| Lowest pressure | 994 hPa (mbar); 29.35 inHg |
| Overall effects | |
| Fatalities | None |
| Damage | None |
| Areas affected | Midway Atoll |
| Script error: The function "split" does not exist. IBTrACS | |
Part of the 2006 Pacific typhoon season (unofficially) | |
Subtropical Storm “60W” was a low-pressure system persisting west of the International Date Line in 2006, showing possibly extratropical, subtropical, or tropical characteristics. Forming as an extratropical cyclone on November 2, the system tracked generally southeastwards, acquiring subtropical features late on November 6. On the next day, the cyclone acquired more tropical characteristics, although it was not recognized as a tropical cyclone by the Japan Meteorological Agency or Joint Typhoon Warning Center. The cyclone began to weaken and turned southwestward on November 8, dissipating south of Wake Island three days later.
Meteorological history
Early on November 2, an extratropical cyclone formed about 2,350 km (1,460 mi)* east of Tokyo, Japan.[1] The system moved very slowly, gaining gale strength on November 3. After becoming a developed low and finishing an anticlockwise loop on November 4, the system started to move southeastwards and weaken slightly on the next day.[2] However, late on November 6, the Japan Meteorological Agency (JMA) reported that the low began to intensify again, with the QuikSCAT data showing winds of 45 to 50 knots on the west side of the system.[3] The Satellite Services Division (SSD) of the National Oceanic and Atmospheric Administration began using the Dvorak technique to analyze the system, later making an initial estimate of ST3.0, indicating a subtropical storm with increased convection near the center.[4]
Consequently, the U.S. Naval Research Laboratory designated the system as 60W, but contents were soon hidden and not accessible via the tropical cyclone page.[5] JMA reported that the cyclone started to develop again early on November 7, when convection had begun wrapping around the west side of the center. Several hours later, SSD analyzed that the system weakened slightly, but deeper convection began to develop closer to the center, mainly in the northwest and southeast corners. Late on the same day, following deep convection continued banding around the center, the cyclone, now about 650 km (405 mi)* west of Midway Atoll, became a shallow symmetric warm-core system. Thus, SSD indicated that the cyclone had transitioned to a tropical storm.[6]
Early on November 8, plenty of dry air started to wrap around the cyclone. Subsequently, when the JMA declared that the cyclone had become developed, it began to drift southwestwards. Deep convection faded away more and more, resulting the system to weaken. Late on the same day, the cyclone was largely devoid of convection; therefore, JMA reported that the cyclone was below gale intensity. The SSD issued the final bulletin on the unclassified system.[7] Although JMA still considered the system an extratropical cyclone, it only maintained a low-level circulation center without deep convection. On November 9, the cyclone passed through the Tropic of Cancer, entering the tropics. The system eventually dissipated early on November 11, about 370 km (230 mi)* south of Wake Island.[8]
Nature of the system
The cyclone was considered as an extratropical, subtropical, or tropical cyclone by different agencies and experts. The Japan Meteorological Agency, which also operates the RSMC Tokyo, recognized the system as an extratropical low. Karl Hoarau, a geographer teaching in the Cergy-Pontoise University, regarded the cyclone as a typical subtropical cyclone, which formed from an occluded cyclone. David Roth of the Weather Prediction Center noted that when the cyclone was located over 23 to 24 °C sea surface temperature on November 7, thunderstorms had broken out on the north side of the center and the depth of convection was greater than an occluded cyclone.[6][9]
The Satellite Services Division (SSD) of the National Oceanic and Atmospheric Administration regarded the cyclone as a subtropical cyclone initially, then later reclassified it as a tropical cyclone. The bulletin issued on November 7 reported that:
Convection has begun to band around the center. Florida State and Penn State University analyzed cyclone phase diagrams based on the 12Z 07 November GFS run indicates this is a shallow symmetric warm core system. The system has transitioned to tropical. 4.5 tenths banding results in a DT of 2.5. PT=2.0. FT of 2.5 is based on DT.[6]
See also
- 2006 Central Pacific cyclone
- Tropical Storm Haiyan (2007)
- Tropical Storm Omeka
- Tropical Storm Yutu (2013)
- Subtropical Storm 96C
References
- ↑ "Advisories on 2 November 2006" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
- ↑ "Advisories on 5 November 2006" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
- ↑ "QuikSCAT/SeaWinds Scatterometer on 6 November 2006" (PNG). Center for Satellite Applications and Research. Retrieved 19 June 2014.
- ↑ "Advisories on 6 November 2006" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
- ↑ "2006 Season Storms". NRL Tropical Cyclone Page. U.S. Naval Research Laboratory. Archived from the original on 20 June 2014. Retrieved 19 June 2014.
- ↑ 6.0 6.1 6.2 "Advisories on 7 November 2006" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
- ↑ "Advisories on 8 November 2006" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
- ↑ "Advisories on 11 November 2006" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
- ↑ Gary Padgett. "Monthly Global Tropical Cyclone Summary November 2006". Retrieved 20 June 2014.
External links
 |
Wikimedia Commons has media related to Subtropical Storm 60W (2006). |
- “Invest” 60W Archived 2013-09-02 at Archive.today from the U.S. Naval Research Laboratory database
- Possible subtropical cyclone summary by Gary Padgett
- Satellite Loop of “60W” on YouTube
This article "Subtropical Storm 60W" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:Subtropical Storm 60W. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.
