|Mean daily temperature anomaly Oct 1-29th, 2019|
Why the cold? Let's begin with the weather pattern we've been in this month.
|500mb height anomalies Oct 1st-28th, 2019|
Strong high pressure in the Gulf of Alaska has resulted in prevailing northerly flow across the area allowing for several rounds of cold, Canadian air to invade the region.
Three noteworthy cold intrusions have occurred during the month as noted by this temperature graphic from Spokane.
|Spokane Airport observed temperatures, normals, and extremes|
Several October temperature records have already been broken including Sandpoint, Ritzville, Davenport, Nezperce, and Winthrop. Soon more locations will likely be added to this list given our cold weather to finish out the month including Spokane, Moscow, and Ephrata.
|October temperature records already or likely to be broken|
Note these temperature aren't final yet for the month and include average temperature for data received thus far. But nonetheless, more records are expected to be broken.
The graphic above summarizes the records. If you are interested in seeing the details of the records broken or likely to be soon broken, read on below. Keep in mind the numbers below are so far. For example for Spokane the average temperature through Oct 29th was 43.1 degrees. However the average temperature only needs to drop to 42.8 degrees to tie the record and 42.7 to break the record. Given the cold temperatures on the 30th and 31st, the record is expected to be broken.
|Spokane, WA top 5 coldest Octobers|
|Moscow, ID top 5 coldest Octobers|
|Ephrata, WA top 5 coldest Octobers|
|Sandpoint, ID top 5 coldest Octobers|
|Ritzville, WA top 5 coldest Octobers|
|Davenport, WA top 5 coldest Octobers|
|Nezperce, ID top 5 coldest Octobers|
|Winthrop, WA top 5 coldest Octobers|