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Ross Bunn edited textbf_Methodology_At_Australian_Capital__.tex
almost 9 years ago
Commit id: 0a093a98a93fb3706b0b97c02135c6f0db6a7f50
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\item T MUCAPE (C)
\item TD MUCAPE (C)
\end{itemize}
\textbf{Using Present Weather Reports of Thunderstorms?}
\begin{itemize}
\item Using Present Weather Reports=thunderstorms +-1 hour from sounding time, identified only 2 soundings (Melbourne 2013-03-16 1200UTC, 2013-05-31 1236UTC).
\item Analysing present weather data for all years at Melbourne Airport with the same time criteria gives \textbf{9} between 23-00UTC, \textbf{41} between 11-12UTC.
\item For Giles \textbf{37} between 23-00UTC, \textbf{117} between 11-12UTC (though no soundings at this time).
\end{itemize}
\textbf{Thoughts and Actions}
\begin{itemize}
\item \textit{What analysis can I use if Era Int doesn't identify ETS in soundings?}
\item \textit{Question - Can I use existing Era Int 850hPa Fronts dataset?}
\end{itemize}
\begin{itemize}
\item Colman 1990a implied ETS existed above very shallow surface inversions well below 850hPa, and in 1990b below ~970hPa. Browning et al 2010 observed the depth of surface inversion to 900hPa where convective initiation occurred above.
\item looks like I will need to calculate fronts dataset as low as I can go 1000? 950?. This will exclude frontal analysis in high topography regions
\item can i just use presence of surface inversion, and Tsurface (td surface) consistent with surrounding?
\end{itemize}
\textit{Question - How do I identify if a sounding lies on the cold/warm side of a front?}
\begin{itemize}
\item check surrounding stations T and TD similar to sounding station T and TD (get sounding SFC T, TD and surrounding station T, TD).
\item find closest era int front to sounding station
\item find station either side of front, T and TD difference > X ?
\item what about approaching from from west closest to station, yet station on cool side of front in east?
\end{itemize}
To identify TS and ELTS, I may use the following from Brooks et al 1994: Proximity soundings for mesocyclone environments were chosen within 160km of the observing site, and +-1 hour from the synoptic time. Soundings with CAPE <150J/kg, CIN>CAPE, EL<300mb were eliminated to account for airmass changes, outflow contamination.
Surface Based thunderstorm soundings were identified by the following criteria:
\begin{itemize}
\item Sfc CAPE > 150J/kg
\item CAPE > CIN
\item sfc CAPE > MUCAPE
\item Present Weather = thunderstorm at any time within +-1hour of sounding time
\item GPATS lightning count >0 within 160km radius of sounding site and within +-1hour of sounding time
\end{itemize}
Elevated thunderstorm soundings were identified by the following criteria:
\begin{itemize}
\item Sfc CAPE < 150J/kg
\item sfc CAPE < CIN
\item MUCAPE > MUCIN
\item sfc CAPE < MUCAPE
\item Present Weather = thunderstorm at any time within +-1hour of sounding time
\item GPATS lightning count >0 within 160km radius of sounding site and within +-1hour of sounding time
\end{itemize}