activity : 0158fa86-nca3-ghcn-daily-r201305-process


Decadal average anomalies for the 99th percentile of precipitation (difference between the decade and the 1901-1960 average precipitation) for the Northwest region were plotted as a bar graph. Note: the far right bar contains data for 12 years (2001-2012).

First, GHCN-D stations with minimal (less than 10%) missing precipitation data were identified. For each station the 99th percentile threshold of daily precipitation was determined using the entire period of record. Next, the total precipitation falling on days exceeding the 99th percentile threshold was calculated for each year. Then, grid box average values were calculated for each year, by averaging the values for each station available in that grid box. The annual values were then averaged for all grid boxes containing data in the Northwest region. Decadal averages were then calculated. Finally the 1901-1960 99th percentile average amount was subtracted from the decadal average amount, and a percentage change was calculated.

The duration of this activity was 6 hours.

Output artifacts generated by this activity :
CS_Extreme Heavy precipitation_v7.png

Computing environment : Linux (CentOS release 6.4); Mac OS X (darwin x86_64 m64)

Software used : Fortran 95; lf95 compiler (Lahey/Fujitsu Linux64 Fortran compiler release L8.10b); IDL (version 8.0)

Visualization software used : IDL (version 8.0)

Notes : Fortran 95 was used to perform numerical calculations. IDL was used to visualize the data.

This activity resulted in the following :

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