Weather Blog

By the numbers: Seattle's Tuesday night rain storm

By the numbers: Seattle's Tuesday night rain storm
Photo: Brendan Ramsey

It's been a very dry summer in Seattle, unless you count the 2 1/2 days it wasn't. Both July and August will go down as having above normal rainfall despite only having measurable rain on six days out of 44 days-- and thee of those rainy days were 0.02" or less.

Here's how Tuesday night/Wednesday morning's rain storm matched up:

1.33" -- The amount of rain that fell Tuesday night into early Wednesday morning at Sea-Tac Airport. It would have been the 5th-wettest August day had it fallen on one day instead of being spread across climate-midnight (1am Pacific Daylight Time -- Climate stats stay on Standard Time year 'round)

0.87" -- The amount of rain that actually fell on Wednesday through noon (counting another 0.02" shower later Wednesday morning). That's nearly triples the daily rainfall record of 0.33".

0.88" -- The average amount of rain in August.

1.53" -- The amount of rain reported by a CoCoRahs volunteer spotter near Factoria Mall where they had all the rainfall problems.

0.32" -- The amount of rain that fell in one hour between 2-3 a.m. Wednesday morning -- almost enough for the daily record on its own.

0.68" -- The amount of rain that fell between 2-5 a.m. Wednesday morning.

~0.75" -- The amount of rain the UW forecast model on Monday predicted would fall between 2-5 a.m. Wednesday morning. Nailed it!

Here is a map of other reported rainfall totals from roughly 7 a.m. Tuesday through 7 a.m. Tuesday, courtesy of that CoCoRahs volunteer network: