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{{Short description|Category 1 South Pacific cyclone in 2003}}
{{good article}}
{{Infobox hurricane 
| Name=Tropical Cyclone Cilla
| Year=2003
| Basin=SPac
| Image location=TC Cilla 28 jan 2003 0055Z.jpg
| Image name=Tropical Cyclone Cilla early on January 28, 2003
| Formed=January 26, 2003
| Dissipated=January 30, 2003
| 10-min winds=40
| 1-min winds=35
| Type=Tropical cyclone
| Gusts=60
| Pressure=995
| Damages=Minimal
| Fatalities=None
| Areas=[[Fiji]], [[Tonga]], [[American Samoa]]
| Hurricane season=[[2002–03 South Pacific cyclone season]]
}}
'''Tropical Cyclone Cilla''' was a [[tropical cyclone]] that brought minor damage to several islands in the South Pacific in January 2003. The fifth cyclone of the [[2002–03 South Pacific cyclone season]], Cyclone Cilla developed from a monsoon trough on January 26 northwest of [[Fiji]]. Initially, Cilla moved east, and due to decreased [[wind shear]], Cilla was able to intensify. On January 28, Cilla reached its peak intensity of 75&nbsp;km/h (45&nbsp;mph). After slightly weakening, Cilla briefly re-intensified the next day. However, Cilla [[extratropical transition|transitioned]] into an extratropical cyclone on January 30. Along its path, Cilla dropped heavy rainfall over islands it passed. During its formative stages, the low dropped heavy rain over Fiji, which had already been affected by [[Cyclone Ami]] two weeks prior. Damage in Tonga was mostly limited to vegetation and [[fruit trees]]; infrastructural damage was also relatively minor. Cilla also brought moderate rain to [[American Samoa]].

==Meteorological history==
{{storm path|Cilla 2003 track.png}}
On January 25, 2003, a [[low-pressure area]] formed within a [[monsoon trough]] about {{convert|300|mi|km|abbr=on|round=5}} northwest of Fiji and moved to the east-southeast.<ref name="BoMSeasonSum">{{cite report|url=http://www.bom.gov.au/jshess/docs/2005/courtney.pdf|title=The South Pacific and Southeast Indian Ocean tropical cyclone season 2003&ndash;2003|last=Courtney, Joseph B|date=2005|publisher=Australian Bureau of Meteorology|pages=11&ndash;12|access-date=January 2, 2010}}</ref> That morning, the [[Joint Typhoon Warning Center]] (JTWC) began to issue warnings on the system, designating it as 12P. Shortly thereafter, Cilla turned southeast hours later in the general direction of [[Tonga]]<ref name="IBTRACS">{{cite web|url={{IBTRACS url|id=2003025S16173}}|title=2003 Tropical Cyclone Cilla (2003025S16173)|publisher=International Best Track Archive for Climate Stewardship|accessdate=February 28, 2023}}</ref> Early on January 26, [[RSMC Nadi]] designated the low as Tropical Depression 07F, after attaining [[maximum sustained wind|10-minute sustained winds]] of 35&nbsp;mph (55&nbsp;km/h).<ref name="AdvB1">{{cite report|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Fiji/2003/Jan/2003012603.WTPS12 |title=Tropical Disturbance Advisory Number B1 |date=January 26, 2003 |publisher=[[Fiji Meteorological Service]] |access-date=January 2, 2010 }}{{dead link|date=May 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> At the time, the slow moving system had a poorly defined [[atmospheric circulation|center of circulation]] that was hard to identify via [[radar]] and [[satellite]] imagery.<ref name="AdvB1" /> In addition, most of the deep thunderstorm activity was displaced to the north and southeast of the center.<ref name="AdvB1" /> Later that morning, the JTWC reported winds of {{convert|35|mph|km/h|round=5|abbr=on}};<ref name="IBTRACS"/> however, the depression did not become any better organized throughout the day.<ref name="AdvB3">{{cite report|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Fiji/2003/Jan/2003012612.WTPS12 |title=Tropical Disturbance Advisory B3 |date=January 26, 2003 |publisher=Fiji Meteorological Service |access-date=January 2, 2010 }}{{dead link|date=May 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref><ref name="AdvB4">{{cite report|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Fiji/2003/Jan/2003012618.WTPS12 |title=Tropical Disturbance Advisory B4 |date=January 26, 2003 |publisher=Fiji Meteorological Service |access-date=January 2, 2010 }}{{dead link|date=May 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Early the next day, RSMC Nadi upgraded the tropical depression to a Category&nbsp;1 tropical cyclone on the [[tropical cyclone scales|Australian intensity scale]] and named it ''Cilla''.<ref name="GW029">{{cite report|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Fiji/2003/Jan/2003012700.WTPS02 |title=Gale Warning 029 |date=January 27, 2003 |publisher=Fiji Meteorological Service |access-date=January 2, 2010 }}{{dead link|date=May 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> By 0600&nbsp;[[UTC]] January 27, the JTWC reported that Cilla had attained 1-minute sustained winds of {{convert|40|mph|km/h|abbr=on|round=5}}, which according to JTWC data, was its peak intensity. Subsequently, Cilla turned east-southeast.<ref name="IBTRACS"/>

Throughout the day, wind shear conditions lessened further; however, shower activity separated from the center, prompting the JTWC to issue its last warning on Tropical Cyclone Cilla later that day. At 2100&nbsp;UTC January 27, RMSC Nadi remarked that the cyclone had become better organized.<ref name=January /> Upon attaining peak intensity, the storm passed fairly closed to [[Tonga]].<ref name="IBTRACS"/> At 0600&nbsp;UTC January 28, Cilla reached its peak intensity, with 10–minute sustained winds of {{convert|45|mph|km/h|round=5|abbr=on}} per RMSC Nadi. At this time, the tropical cyclone was located about {{convert|400|mi|km|abbr=on|round=5}} south-southeast of [[Pago Pago]]. Rapidly moving, Cilla showed [[baroclinic cyclone|baroclinic]] characteristics, hinting that the system was a [[extratropical low|hybrid low]], sustaining characteristics of both tropical and nontropical cyclones.<ref name=January>{{cite report|title=January 2003|url=http://www.australiansevereweather.com/cyclones/2003/summ0301.htm|work=Monthly Global Tropical Cyclone Summary|publisher=Australian Severe Weather|access-date=December 7, 2012|author=Padgett, Gary}}</ref> According to RMSC Nadi, Cilla weakened slightly<ref name="IBTRACS"/> as the storm lost organization due to increased wind shear.<ref name=January />

On January 29, thunderstorm activity once again increased in converge around the center, though at first, the convection was sheared at times. On 0000&nbsp;UTC, [[Dvorak technique|Dvorak satellite intensity estimates]] yielded a 3.0, suggesting a tropical cyclone with 10–minute winds of {{convert|45|mph|km/h|round=5|abbr=on}}, Cilla's secondary peak intensity. Satellite images indicated a [[rainband|banding pattern]] associated with the cyclone. The JTWC briefly watched this system for regeneration, noting it had a "fair" chance. However, continued wind shear began to weaken Cilla, and by 1200&nbsp;UTC on January 29, Cilla was reduced to a tropical depression<ref name=January /> just before the system turned south-southeast.<ref name="IBTRACS"/> With the center exposed from the deep convection, Tropical Depression Cilla transitioned into an extratropical cyclone at 1100&nbsp;UTC the next day, on January 30.<ref name=January /> The extratropical cyclone completely dissipated two days later.<ref name="IBTRACS"/>

==Impact and aftermath==
As a tropical depression, Cilla passed over [[Vanua Levu]]. Even though the region had been severely affected by [[Cyclone Ami]] two weeks earlier,<ref name="NadiSeasonSum" /> [[flooding|flood waters]] that resulted from rains associated with the cyclone quickly receded due to the storm's rapid motion.<ref name="rnzihaapai">{{cite news|title=Cyclone Cilla moving towards Tonga's Ha'apai islands|url=http://www.rnzi.com/pages/news.php?id=289&op=read|access-date=December 7, 2012|date=January 27, 2003|agency=[[Radio New Zealand International]]}}</ref>

When Cilla first posed a threat to Tonga, the Fiji Meteorological Service (FMS) issued a [[tropical cyclone warnings and watches|tropical cyclone alert]] for the entire island chain.<ref name=rnzihaapai /> Damage in [[Tonga]] was mostly limited to vegetation and [[coconut]] and [[banana]] trees;<ref name=batter>{{cite news|title=Two cyclones continue to batter South Pacific|url=http://www.highbeam.com/doc/1P1-71337530.html|archive-url=https://archive.today/20130125042722/http://www.highbeam.com/doc/1P1-71337530.html|url-status=dead|archive-date=January 25, 2013|access-date=December 7, 2012|date=January 28, 2003|agency=Associated Press|location=Suva, Fiji}} (Subscription required)</ref> damage to infrastructure was minor.<ref name=minordamage>{{cite news|title=Only minor damage in initial reports as cyclone hits Tonga.|url=http://www.accessmylibrary.com/coms2/summary_0286-22386440_ITM|access-date=December 7, 2012|date=January 28, 2003|author=Asia Africa Intelligence Wire|agency=[[BBC Monitoring]]}}</ref> Peak winds of {{convert|32|mph|km/h|abbr=on}} and peak gusts of {{convert|67|mph|km/h|abbr=on}} were recorded in [[Ha'apai]].<ref name="NadiSeasonSum">{{cite report|title=Tropical Cyclone Seasonal Summary 2002-2003 season |publisher=Fiji Meteorological Service |url=http://www.met.gov.fj/documents/TC_Seasonal_Summary_02-031190690457.pdf |access-date=October 13, 2012 |author=RSMC Nadi&nbsp;— Tropical Cyclone Centre |archive-url=https://web.archive.org/web/20081001150746/http://www.met.gov.fj/documents/TC_Seasonal_Summary_02-031190690457.pdf |archive-date=October 1, 2008 |date=August 29, 2007 |url-status=dead }}</ref> Power was lost on [[Lifuka]] for about three hours during the night of January 27.<ref name="NadiSeasonSum" /> Communications services were also affected but restored on January 28.<ref name="NadiSeasonSum" />

Cilla also affected the [[American Samoa]], providing moderate rainfall over the area, peaking at {{convert|2.21|in|mm|abbr=on}} in Asasfou.{{Tropical Cyclone Point Maxima}} The name ''Cilla'' was [[Tropical cyclone naming|retired]] by the [[World Meteorological Organization]] after the season, and was replaced by ''Cody''.{{RA V Tropical cyclone operational plan}}

==See also==
{{Portal|Tropical cyclones}}
*[[Cyclone Cliff]]
*[[Cyclone Tam (2006)]]
*[[Cyclone Ami]]
{{clear}}

==References==
{{reflist|2}}

==External links==
{{SPAC EL's}}

{{Retired South Pacific cyclones}}
{{2002-03 South Pacific cyclone season buttons}}
{{Category 1 South Pacific tropical cyclones}}

{{DEFAULTSORT:Cilla (2003)}}
[[Category:Retired South Pacific cyclones]]
[[Category:Tropical cyclones in Fiji]]
[[Category:Tropical cyclones in Tonga]]
[[Category:Tropical cyclones in American Samoa]]
[[Category:2002–03 South Pacific cyclone season]]
[[Category:Category 1 South Pacific cyclones]]
[[Category:Tropical cyclones in 2003|Cilla]]
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