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Ross Bunn edited textbf_Methodology_At_Melbourne_and__.tex
almost 9 years ago
Commit id: 677542fca8f60b0ea7a86b25e66b243236125c4e
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\textbf{Methodology}
At
Melbourne and Giles Airports, Australian Capital City sites, all
2013 soundings
(Melbourne Airport 00 & 12Z between 2008-2015 were extracted from the BoM. Thunderstorm soundings
n=726, were identified using GPATS lightning strike data. A sounding was flagged as a thunderstorm sounding if, (a) 1 or more strikes occcurred within a 50km box centred about the sounding site, and
Giles Airport 00Z (b) within +-1hour from the sounding time. A total of 316 thunderstorm soundings
n=361) were
used to calculate various thermodynamic quantities. identified using this method.
For each
thunderstorm sounding the following was
extracted: calculated:
\begin{itemize}
\item Theta Surface (K)
\item Theta Max upper (K)
...
\item Lev MUCAPE (hPa)
\item T MUCAPE (C)
\item TD MUCAPE (C)
\item Weather Type
\item Weather Reported
\end{itemize}
\textbf{Preliminary Results} \textbfUsing 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?}
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\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}