Cape Bre­ton Weather

The Victoria Standard - - Weather -

er 353! What a vivid way of de­pict­ing the vari­a­tion in daily pre­cip­i­ta­tion amounts!

Nat­u­rally, I won­dered about Cape Bre­ton’s 50% day num­bers. I dove into Syd­ney’s daily pre­cip­i­ta­tion for the years of 2012 through 2018 and found the av­er­age 50% day was 24. This rel­a­tively high value in­di­cates that Syd­ney’s pre­cip­i­ta­tion is dis­trib­uted more evenly than at many other places. Cape Bre­ton’s lo­ca­tion on sev­eral ma­jor storm tracks and its rugged to­pog­ra­phy com­bine to bring us pre­cip­i­ta­tion on most days of the year: 191 of them on the av­er­age. In con­trast, a few rainy days in a semi-arid place like Saska­toon can dom­i­nate its an­nual pre­cip­i­ta­tion pic­ture. Saska­toon’s 50% day num­ber last year was only 13, barely half of Syd­ney’s.

Some­how every weather ar­ti­cle, no mat­ter where it be­gins, seems to end up with cli­mate change, and this one is no ex­cep­tion. Pen­der­grass and Knutti used com­puter-based cli­mate mod­els to study how the 50% day num­ber might change from now un­til the end of the cen­tury. The mod­els pro­jected a slight de­crease, from day 12 to day 11. In other words, in fu­ture years, the eleven wettest days will pro­duce as much pre­cip­i­ta­tion as the 12 wettest days do now. Con­cen­trat­ing the pre­cip­i­ta­tion into fewer days im­plies a height­ened risk for fu­ture heavy down­pours and flood­ing.

Newspapers in English

Newspapers from Canada

© PressReader. All rights reserved.