The Wettest September 28th on Record

Tomorrow will likely be the most rain recorded at numerous stations around BC for a September 28th since records have been kept. There's quite an exceptional storm knocking at our front doors:


 For reference, daily extreme rainfall amounts for a September day for YVR is currently 49.5 mm, which will be threatened tomorrow. In fact, the rainfall accumulated on the 28th, 29th, and 30th, will likely make this the wettest September in our history. 

The GFS model might be over-doing rainfall amounts a little bit, but here is their latest model run for 72 hour rainfall accumulation for the south coast: 


Rainfall Through till Monday Evening.jpg

Areas of red mean amounts between 5-10 inches (125-250mm), and those small white specks include anything over 10 inches!

Absolutely incredible rainfall amounts for the mountainous coastal regions in this province. Note the typical east Vancouver Island rain shadow is in effect. Lesser amounts for this region. 

Winds tomorrow will be somewhat of a factor. Expect possible ferry cancellations in the Georgia Strait (Follow @BCferries for more information). Winds will be strongest over the northern waters of Georgia Strait with up to 40 knot winds forecasted during the morning and early afternoon. Similar to your average November gale -- rains are going to be the main story for tomorrow. 

On Sunday the latest GFS model is now showing an unusually large, and rapidly intensifying low approach Vancouver Island from the SW. I can't stress how unusual this is for September. As of now, the cyclone in question is projected to be going through a strong period of intensification, creating a very tight pressure gradient (same rapid intensification at landfall for the March 12th, 2012 windstorm).

Normally your average extratropical cyclone that reaches the BC coast are in a mature or fading state, not rapidly deepening, as what this model predicts for Sunday evening.  

These types of situations typically produce the strongest southeast winds for our area.  

Just be aware this is still 63 hours out on a single model, and the track has the potential to change considerably, which will no doubt influence where the strongest winds will be. Right now anywhere from as far north as Campbell River and to as far south as Vancouver and Victoria should pay extra attention to the forecast during the next 72 hours. 

 Areas highlighted in dark blue in the Georgia strait indicate 60 knot wind gusts at 8 pm PST Sunday (just below hurricane force threshold) 

Areas highlighted in dark blue in the Georgia strait indicate 60 knot wind gusts at 8 pm PST Sunday (just below hurricane force threshold) 

 Have a safe and rain-filled weekend, 




You've probably heard of the Northern Lights or also known as Aurora Borealis, but you've unlikely heard of it's anthopogenic cousin, the Light Poles:


Light poles.jpg

As you must have guessed, atmospheric conditions have to be really specific for these special light poles to form, but you're more likely to see them at higher latitudes. The weather recipe is as follows: 

1) Add EXTREMELY cold temperatures (less than -20, sorry Vancouver) 

2) Light or no winds

3) Ample Ice crystals in the lower atmosphere