Seattle’s final fling with hot weather featured a celestial fireworks show on Wednesday night, in the form of an auroral display that benefited from clear skies as well as a strong geomagnetic storm.
The northern lights were pumped up by a wave of electrically charged particles thrown off by the sun a couple of days earlier — a phenomenon technically known as a coronal hole high-speed stream.
SpaceWeather.com reported that heightened auroras were spotted along the northern tier of the U.S., including Washington as well as Montana, Minnesota, Wisconsin, Illinois and Michigan.
Seattle’s auroral glow might have seemed faint to the naked eye, but long-exposure photography brought out shimmering colors, as seen in these pictures and videos:
A time lapse of the #aurora reaching a crescendo of sorts around the 11 o'clock hour last night. What a sight! pic.twitter.com/n6G2gDm69u
— NWS Seattle (@NWSSeattle) September 28, 2017
Some images from last night… pic.twitter.com/3wTWBYZbpH
— Skunkbayweather (@Skunkbayweather) September 28, 2017
A touch of Northern Lights over Seattle early this morning made for an even more picturesque Emerald City skyline pic.twitter.com/hYlDUQFT2k
— Tim Durkan (@timdurkan) September 28, 2017
2 Minute Aurora Video @WeatherNation @WunderCave @TamithaSkov @NorthLightAlert @TWCChrisWarren @StormHour
HD: https://t.co/CO8hqeHk3P pic.twitter.com/uC70s8o8ru— Skunkbayweather (@Skunkbayweather) September 28, 2017
@NWSSeattle Port Gamble S’Klallam Tribe #aurora #NorthernLights pic.twitter.com/fXJig3GUIT
— Joseph Price (@Greyrock360) September 28, 2017
Aurora Borealis from Port Angeles, WA Wednesday evening at about 11 p.m. @ScottSKOMO #Auroraborealis pic.twitter.com/BZujNIEGfO
— Jay Cline (@ClineNorthwest) September 28, 2017
#Aurora over #Seattle & #ferry 9/27/17 @komonews @KIRO7Seattle @Q13FOX @KING5Seattle @ScottSKOMO @ShannonODKOMO @KellyKIRO7 @MorganKIRO7 pic.twitter.com/vCfs4XmLhT
— Wild NW Beauty Photo (@WildNWBeauty) September 28, 2017
Amazing #SeattleAurora tonight. Great shots, one with a bright meteor. pic.twitter.com/78QWenO6f0
— u2622 u1F953 (@arebee) September 28, 2017
NASA's Suomi NPP climate & weather satellite does a great job at seeing #aurora. This overnight image shows it coast to coast over Canada. pic.twitter.com/CHsUk5HULG
— NWS Seattle (@NWSSeattle) September 28, 2017
We’re not likely to see another show like this for a while. For one thing, the forecast for space weather isn’t as stormy. The National Weather Service’s Space Weather Prediction Center says the outlook calls for reduced geomagnetic activity, although regions farther north might still see auroras.
The other factor is that the Seattle area will be reverting to a more typical weather pattern overnight. University of Washington atmospheric scientist Cliff Mass explains that a temporary ridge of high pressure is giving way to a low-pressure trough, signaling an end to “the last warm days of the year.”
The National Weather Service’s Seattle office went so far as to call Wednesday night “our final clear night for the foreseeable future.” Now there’s a sobering thought for skywatchers …