Hawk wrote: ↑Sat Sep 18, 2021 8:05 am
Interesting how since around 1985 the trend has been downward with precip amounts ~40-50% less. In that same time period, much less snow with a downward trend as well
Could these be related > Less precip in summers and milder/less snow in winter?
Nito? Monty? Goose? C79? Bono? Anyone?
The rolling average for June-September precip was just as low in the late 40s thru the 50s (when we had some big snow years) as it is in the present-day. Which makes me think there isn't much of a correlation.
I posted similar graphs for Vancouver a while back, check the stats thread if you're interested.
VanCitySouth wrote: ↑Sat Sep 18, 2021 1:15 am
Not just early season. 50.9mm at YVR is fairly impressive for any rainstorm, even in November. I counted 59 of the 84 years at YVR, there were no days with over 50mm of rain.
Some of the highest historical precip events in SW BC have been earlier in the season including the Thanksgiving weekend 1984, Labor day weekend 1991, Oct 16-18 1993 (Oct 16 all time record for yvr) mid October 2012, August 29, 2015, Aug 31 2010, Sept 18, 2004 and now Sept 17 2021. Some of those were one day wonders but not the labor day weekend stom of 1991 which caused severe flooding in the Sea to Sky as did the Thanksgiving weekend storm in 1984 that flooded the Pemberton Valley. These early season events often have old typhoon moisture embedded and can have higher precip rates per hr then a mid-winter AR. That's why some of the worst flooding is early in the season and that's crazy considering it occurs without a snowpack to melt and with the rivers and creeks starting off low.
Unfortunately in heavy downpours my Vantage Pro 2 rain gauge lags behind other gauges. With that my total up until present is an even 79 mm but with my CoCoRaHS rain gauge I measured 91.8 mm.
Coquitlam79 wrote: ↑Sat Sep 18, 2021 2:40 pm
Some of the highest historical precip events in SW BC have been earlier in the season including the Thanksgiving weekend 1984, Labor day weekend 1991, Oct 16-18 1993 (Oct 16 all time record for yvr) mid October 2012, August 29, 2015, Aug 31 2010, Sept 18, 2004 and now Sept 17 2021. Some of those were one day wonders but not the labor day weekend stom of 1991 which caused severe flooding in the Sea to Sky as did the Thanksgiving weekend storm in 1984 that flooded the Pemberton Valley. These early season events often have old typhoon moisture embedded and can have higher precip rates per hr then a mid-winter AR. That's why some of the worst flooding is early in the season and that's crazy considering it occurs without a snowpack to melt and with the rivers and creeks starting off low.
Don't forget about the event in September 2010 as well.
Coquitlam79 wrote: ↑Sat Sep 18, 2021 2:40 pm
Some of the highest historical precip events in SW BC have been earlier in the season including the Thanksgiving weekend 1984, Labor day weekend 1991, Oct 16-18 1993 (Oct 16 all time record for yvr) mid October 2012, August 29, 2015, Aug 31 2010, Sept 18, 2004 and now Sept 17 2021. Some of those were one day wonders but not the labor day weekend stom of 1991 which caused severe flooding in the Sea to Sky as did the Thanksgiving weekend storm in 1984 that flooded the Pemberton Valley. These early season events often have old typhoon moisture embedded and can have higher precip rates per hr then a mid-winter AR. That's why some of the worst flooding is early in the season and that's crazy considering it occurs without a snowpack to melt and with the rivers and creeks starting off low.
Oct. 2003, not 1993.
The 85.0 mm on Oct. 16, 2003 is a monthly record only. We have 89.4 mm on Dec. 25, 1972 and 91.6 mm on Sept. 18, 2004 (this one was a big thunderstorm, not an AR).
The 85.0 mm on Oct. 16, 2003 is a monthly record only. We have 89.4 mm on Dec. 25, 1972 and 91.6 mm on Sept. 18, 2004 (this one was a big thunderstorm, not an AR).
January 1935 was worse. Huge rainfall totals over a 24, 48, 72 and 96 hour period. Massive ice storm, and rain after things warmed up a touch.
The 85.0 mm on Oct. 16, 2003 is a monthly record only. We have 89.4 mm on Dec. 25, 1972 and 91.6 mm on Sept. 18, 2004 (this one was a big thunderstorm, not an AR).
October 2003 was one of the most intense AR events to hit the region. Widespread flooding and non-existent rain shadow.
AbbyJr wrote: ↑Sat Sep 18, 2021 5:29 pm
October 2003 was one of the most intense AR events to hit the region. Widespread flooding and non-existent rain shadow.
