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Is it unusual to see major flooding events in October?

October flooding happens more often than you may think.

SNOQUALMIE, Wash. — Many of us associate flooding in the Northwest during November, December and then again in the spring. 

But is it too early for this kind of flooding? The National Weather Service's Seattle office says not necessarily.

Overnight heavy rainfall caused major flooding in several western Washington areas, particularly near the Snoqualmie River. 

At 41,000 cubic feet per second, the Snoqualmie River caused major flooding from the town of Snoqualmie downstream through Fall City. 

The City of Snoqualmie got twice as much water as officials were expecting. 

The Snoqualmie River is expected to crest at 56.3 feet. The flood stage for the river is 54 feet. 

A flood crest is the highest level a river reaches before it goes back down.

While 56.3 feet seems high, it's not necessarily the highest the Snoqualmie River has seen in the month of October. 

It's also not unusual to see major flooding events as early as September. For instance, there has been flooding at Snoqualmie River near the Falls on Sept. 30 in 2000 and 2005. 

Here's a look at the history: 

Snoqualmie River near Carnation (minor flood stage at 54')

58.6' on Oct. 22, 2019

56.97' on Oct. 17, 1988

56.85' on Oct. 21, 2003

54.78' on  Oct. 19, 1947

54.64 on Oct. 25, 1985 

54.58' on Oct. 22, 2017

Snoqualmie River near the Falls (minor flood stage at 20,000 CFS)

40,400 cubic feet per second (CFS) on Oct. 16, 1988 

36,000 CFS on Oct. 31, 2015 

33,880 CFS on Oct. 22, 2017 

29,200 CFS on Oct. 21, 2003 

23,600 CFS on Oct. 30, 1997

20,250 CFS on Oct. 22, 2019

Snohomish River at Snohomish (minor flood stage at 25 feet) 

28.53' on Oct. 21, 2003 

27.5' on Oct. 22, 2019

27.25' on Oct. 16, 1988 

27.10' on Oct. 19, 1947

27.07' on Oct. 26, 1955 

26.70' on Oct. 25, 1946

Skokomish River combined forks 

8,080 CFS on Oct. 30, 2012 

7,520 CFS on Oct. 31, 2012 

4,770 CFS on Oct. 10, 2010  

Skokomish River near Potlatch (minor flood stage at 16.5') 

17.70' on Oct. 15, 2016

17.59' on Oct. 20, 2003 

17.52' on Oct. 31, 2015 

17.45' on Oct. 14, 2016 

17.43' on Oct. 20, 2016 

Tolt River near Carnation 

12,300 CFS on Oct. 31, 1942 

11,100 CFS on Oct. 20, 2003

8,450 CFS on Oct. 25, 1946 

7,720 CFS on Oct. 19, 1947 

7,420 CFS on Oct. 25, 1955 

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