Looking for Soundings from the past week or so??

[Alex Lamers]

http://www.spc.noaa.gov/exper/soundings/

New SPC page. Looks pretty nice! Can't wait to try it out during an actual event and see if it will help.

[Alex Lamers]

A question though...anyone know what the dashed bright red line is in this one? Looks to be a seperate thermal profile, but I am unsure. GOES sounding? Looks to have an impact on the values below if you would change it.

http://www.spc.noaa.gov/exper/soundings/06...400_OBS/TBW.gif (http://www.spc.noaa.gov/exper/soundings/06020400_OBS/TBW.gif)

[mikegeukes]

Parcel Lapse Rate is the darker dashed line

[nickgrillo]

Parcel Lapse Rate

Mike

No, he's not talking about the parcel ascent curve... Hmmm... I believe Alex is referring to the virtual temperature? Refer to: Doswell, C.A., III, and E.N. Rasmussen, 1994: The effect of neglecting the virtual temperature correction on CAPE calculations. (http://webserv.chatsystems.com/~doswell/publications/virtual_corr_94.pdf)

<img src=http://www.spc.noaa.gov/exper/mesoanalysis/help/img/virtual.gif>

I am guessing that the red dashed line next to the environmental temperature is the virtual temperature.

[Glen Romine]

http://www.unidata.ucar.edu/software/gempa...al/nsharp2.html (http://www.unidata.ucar.edu/software/gempak/tutorial/nsharp2.html)

On the Skew-t diagram, temperature is represented by the red line, dewpoint is represented by green, wet-bulb temperature by the cyan line, and virtual temperature by the dashed red line. The lifted parcel profile is shown using the dashed white line.

Note that for the postscript output, the parcel line cannot be white on a white background, so the parcel is instead given a dark red color.

Glen

[Ronnie Bradley]

Nice link!!!
Those SPC Skew-T's to me, IMHO, are easier to read and understand than the ones found elsewhere on the net. Page bookmarked :)

[Alex Lamers]

Thank you Ronnie and thank you Nick and Glen. Based on the PDF it would seem that the virtual temperature correction, if not made, can introduce pretty large errors into the forecast. They suggested using the most unstable parcel from the lowest 300mb.

Any opinions on this method?