# Hurricane Ophelia

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## Chapter IV: Weather situation: 13 May 12.00 UTC

### Table of Contents

- Chapter IV: Weather situation: 13 May 12.00 UTC
- Weather situation: 13 May 12.00 UTC

### Weather situation: 13 May 12.00 UTC

A Cold Front cloud band is situated over Austria. In the eastern part of Austria several MCSs can be observed. Whilst they are separate from the front, they do develop in the prefrontal, unstable airmass. The MCSs are charcterised by the following features:

- situated in an area of WA
- Showalter index has decreased over the last 6 hours (-3)
- θe forms a ridge

Figure 9: left: 13 May 2003/12.00 UTC - Meteosat IR image; red: temperature advection 700 hPa, green: equivalent thickness, blue: TFP
right: 13 May 2003/12.00 UTC - Meteosat IR image; yellow: Showalter index, magenta: Showalter index = 0

Figure 10: 13 May 2003/12.00 UTC - Meteosat IR image; magenta: θe 850 hPa