October is barely past the halfway point and already Spokane has seen one of the rainiest Octobers on record.
Through early Monday, 3.14 inches of rain had fallen on Spokane as measured at Spokane International Airport, the city’s official weather reporting site.
That total is enough to make this October the seventh rainiest on record.
But another rainstorm expected on Wednesday night through Thursday is almost certain to boost that total by another quarter-inch to half-inch of rain.
If that forecast pans out, it would make this October the fourth or fifth rainiest on record with more than a week left in the month.
National Weather Service forecaster Jeremy Wolf said the next storm will set up with another “atmospheric river” of moisture flowing into the Inland Northwest from subtropical ocean waters.
Conditions may dry out over the weekend, he said.
But the extended outlook after that calls for wetter-than-normal conditions eight to 14 days from Monday.
During that period, cooler-than-normal conditions may bring snow to higher elevations, Wolf said.
The wettest October on record was in 1947, when 5.41 inches were measured.
The other wet Octobers were in 1882, 4.81 inches; 1950, 4.05 inches; 1934, 3.45 inches; 1996, 3.27 inches; and 1951, 3.26 inches.
Normal October rainfall through Sunday in Spokane is 0.45 inches.
The weather service in Spokane issued a roundup of damage from last Friday’s windstorm, which included downed trees near Newport, Kettle Falls and at Wellesley Avenue and C Street.
A series of small debris slides was reported on the south side of Lake Chelan.
Last week, the Climate Prediction Center said a weak La Nina, or cooling of tropical Pacific waters, is possible through the next several months.
If so, that means that the December through February stretch could bring more precipitation than normal, but temperatures will run close to normal, according to the latest climate prediction.
Also, the U.S. Geological Survey reported that the Clearwater River at Spalding, Idaho, set a record for flow on Monday with 8,850 cubic feet of water per second.
That breaks the previous record of 8,260 cfs in 1976. Records have been kept there for 45 years.
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