Pathfinder
Editor, Senior Moderator
Western Pacific - Tropical Storm Six
wdpn31 pgtw 230300msgid/genadmin/navmarfcstcen Pearl Harbor hi/jtwc//subj/prognostic reasoning for tropical storm 06w warning nr 04//rmks/1.
For meteorologists.
2. 12 hour summary and analysis. A.
Tropical Storm (TS) 06w (six), located approximately 180nm south-southeast of hainan, has tracked west-northwestward at 11knots over the past six hours.
Recent animated visible satelliteimagery shows convective banding wrapping around a low levelcirculation center (LLCC).
A 222211z SSMI microwave image depictsdeep convection forming around the eastern periphery of a looselywrapped LLCC with the majority of deep convection in the southernsemicircle.
There is low confidence in the initial position, whichis based on the SSMI image. The initial intensity is based on pgtw,knes, and rjtd Dvorak estimates of 35 knots.
Although deepconvection has started to develop on the eastern side of the system,there is still an upper level trough to the north of the LLCCcausing subsidence and slow development.
The upper level trough isalso significantly hindering poleward outflow, while equatorwardoutflow remains good. 3. Forecast reasoning. A. This forecast philosophy is similar to the previous prognosticreasoning. B.
Ts 06w is expected to continue tracking west-northwestwardalong the southwestern periphery of a subtropical steering ridgeanchored over Japan through an area of low vertical wind shear andhigh ocean heat content.
The upper level trough to the north isforecast to continue to fill and allow for gradual intensification.After tau 24, land interaction should disrupt the low level inflowand cause slight weakening. Ts 06w is expected to make landfallsouth of hanoi, Vietnam after tau 48 and turn westward with the lowlevel steering flow as it weakens. C. By tau 96, ts 06w should dissipate as a significant tropicalcyclone over the mountainous terrain of northern Vietnam.
Currentnumerical model guidance is in good agreement except for NOGAPS,GFDN, and WBAR which turn the system farther northward after aroundtau 36.
These models are forecasting an upper level, mid-latitudetrough to weaken the steering ridge more so than the other models.However, this forecast is in agreement with the ECMWF, EGRR and JGSMmodels.//
http://www.wunderground.com/tropical/wp201006.disc.html
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wdpn31 pgtw 230300msgid/genadmin/navmarfcstcen Pearl Harbor hi/jtwc//subj/prognostic reasoning for tropical storm 06w warning nr 04//rmks/1.
For meteorologists.
2. 12 hour summary and analysis. A.
Tropical Storm (TS) 06w (six), located approximately 180nm south-southeast of hainan, has tracked west-northwestward at 11knots over the past six hours.
Recent animated visible satelliteimagery shows convective banding wrapping around a low levelcirculation center (LLCC).
A 222211z SSMI microwave image depictsdeep convection forming around the eastern periphery of a looselywrapped LLCC with the majority of deep convection in the southernsemicircle.
There is low confidence in the initial position, whichis based on the SSMI image. The initial intensity is based on pgtw,knes, and rjtd Dvorak estimates of 35 knots.
Although deepconvection has started to develop on the eastern side of the system,there is still an upper level trough to the north of the LLCCcausing subsidence and slow development.
The upper level trough isalso significantly hindering poleward outflow, while equatorwardoutflow remains good. 3. Forecast reasoning. A. This forecast philosophy is similar to the previous prognosticreasoning. B.
Ts 06w is expected to continue tracking west-northwestwardalong the southwestern periphery of a subtropical steering ridgeanchored over Japan through an area of low vertical wind shear andhigh ocean heat content.
The upper level trough to the north isforecast to continue to fill and allow for gradual intensification.After tau 24, land interaction should disrupt the low level inflowand cause slight weakening. Ts 06w is expected to make landfallsouth of hanoi, Vietnam after tau 48 and turn westward with the lowlevel steering flow as it weakens. C. By tau 96, ts 06w should dissipate as a significant tropicalcyclone over the mountainous terrain of northern Vietnam.
Currentnumerical model guidance is in good agreement except for NOGAPS,GFDN, and WBAR which turn the system farther northward after aroundtau 36.
These models are forecasting an upper level, mid-latitudetrough to weaken the steering ridge more so than the other models.However, this forecast is in agreement with the ECMWF, EGRR and JGSMmodels.//
http://www.wunderground.com/tropical/wp201006.disc.html
</PRE>
View Tropical Weather View Hurricane Archive
http://www.wunderground.com/tropical/tracking/wp201006_5day.html#a_topad
<TABLE id=mapTable class=sm cellSpacing=0 cellPadding=3><TBODY><TR><TD class=full>Image Updated: 2:59 AM GMT on August 23, 2010</TD><SCRIPT language=javascript> var prefix="wp201006_sat"; var zoom=3; var suffix = ".jpg"; var zoomtext; if (zoom != 3) zoomtext= "_"+ zoom; else zoomtext=""; function zoom_sat(dir) { if (dir=="in") zoom--; else zoom++; if (zoom < 0) zoom = 3; if (zoom > 3) zoom = 0; if (zoom != 3) zoomtext= "_"+ zoom; else zoomtext=""; document.getElementById('tropicalmap').src="http://icons-pe.wunderground.com/data/images/"+prefix+zoomtext+suffix; return; } function anim_sat() { if (suffix==".jpg") { suffix="_anim.gif"; document.getElementById("anim_button").src = "http://icons-ecast.wxug.com/graphics/pause_12x12.gif"; document.getElementById("anim_text").innerHTML = "Stop"; } else { suffix=".jpg"; document.getElementById("anim_button").src = "http://icons-ecast.wxug.com/graphics/play_12x12.gif"; document.getElementById("anim_text").innerHTML = "Animate"; } document.getElementById('tropicalmap').src="http://icons-pe.wunderground.com/data/images/"+prefix+zoomtext+suffix; return; } </SCRIPT><TD>
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