Articles | Volume 15, issue 12
https://doi.org/10.5194/nhess-15-2605-2015
https://doi.org/10.5194/nhess-15-2605-2015
Research article
 | 
09 Dec 2015
Research article |  | 09 Dec 2015

On the inclusion of GPS precipitable water vapour in the nowcasting of rainfall

P. Benevides, J. Catalao, and P. M. A. Miranda

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Short summary
Precipitable water vapour (PWV) retrieved from GPS delay data is analysed in several case studies of intense precipitation in Lisbon. It is found positive correlation between PWV behaviour and the probability of precipitation. A least-squares fitting of a broken line tendency shows that most severe rainfall occurs in descending trends after a long PWV ascending period. A simple forecast algorithm identifies the majority of large rain events, yet with a substantial amount of false positives.
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