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Mark Nelsen

@marknelsenweather.bsky.social
1.3K followers 32 following 64 posts

Chief Meteorologist KPTV, Portland, OR

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Mark Nelsen @marknelsenweather.bsky.social · 01/05/2025
What follows record-dry April weather? A summerlike May Day. New weather blog post this evening www.kptv.com/2025/05/01/w...
kptv.com
What follows record-dry April weather? A summerlike May Day
Spring has turned sharply warmer/drier compared to March and early April. Now it appears this unusual pattern continues into the first half of May.
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Mark Nelsen @marknelsenweather.bsky.social · 08/04/2025
Spring so far? About as normal as it gets! New weather blog post this evening: www.kptv.com/2025/04/08/s...
kptv.com
Spring so far? About as normal as it gets!
The next week or so look pretty close to normal; no extremes. Rainfall will be near average and temperatures close as well
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Mark Nelsen @marknelsenweather.bsky.social · 04/04/2025
New weather podcast just dropped. 'Baseball-sized hail' to... rainbows? Mark & Camila discuss the lackluster stormy weather last week, flooding in southeast Oregon, and what's coming up. Audio version has already dropped into your feed, but we suggest video version here: www.kptv.com/podcasts/wea...
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Mark Nelsen @marknelsenweather.bsky.social · 11/03/2025
The Ides of March? Beware of rain, but no dangerous weather in weather blog this evening www.kptv.com/2025/03/11/i...
kptv.com
The Ides of March? Beware of rain, but no dangerous weather
If you’ve lived here more than a year, you know our springs swing from wet to dry, cold to warm. We just had warm and mainly dry...you know what comes next!
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Mark Nelsen @marknelsenweather.bsky.social · 07/03/2025
New weather podcast episode just dropped. Spring has sprung! We cover this weekend, wet weather next week, and that sub-par "planetary parade" last week. Always lots of fun... Best to watch it here, www.kptv.com/podcasts/wea... but it should have already dropped into your favorite audio feed too.
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Mark Nelsen @marknelsenweather.bsky.social · 27/02/2025
Put a fork in it...winter is over in the lowlands west of the Cascades. But that doesn't mean the chance for a wet morning snowfall is gone (remember that spring snow in early April 2022???) New weather blog post this evening... www.kptv.com/2025/02/27/w...
kptv.com
Winter is over in the lowlands west of the Cascades
Winter is over in the lowlands west of the Cascades, but what does that mean?
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Mark Nelsen @marknelsenweather.bsky.social · 24/02/2025
Windy! A sort of "Baby Bomb Cyclone" (yes, I made that up) arrives on PACNW coastline overnight. Details on timing and strength in my weather blog post this morning www.kptv.com/2025/02/24/f...
kptv.com
First Alert for strong south wind later today and tonight
It's a First Alert Weather "afternoon and night" as strong southerly wind gusts arrive. There will be scattered power outages overnight and into the Tuesday morning commute
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Mark Nelsen @marknelsenweather.bsky.social · 12/02/2025
New weather blog post this evening: www.kptv.com/2025/02/12/c...
kptv.com
Confidence increasing in a disruptive snow/ice event in lowlands
I’m feeling more confident this evening that weather really WILL disrupt our lives Thursday and Friday. There are increasing signs that widespread snow will spread north through western Oregon and SW ...
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Mark Nelsen @marknelsenweather.bsky.social · 12/02/2025
The big message? Confidence up that we've got a widespread snow/freezing rain event Thursday to Friday morning in the I-5 corridor, Gorge, and coastline. Have option to work from home? Plan on doing that Thursday. And yes, most schools likely close Friday. More later in a wx blog post
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Mark Nelsen @marknelsenweather.bsky.social · 10/02/2025
Quick explanation plus a "best and worst case scenario" later this week in my weather blog this evening. Sorry about the poor timing florists and bakeries! www.kptv.com/2025/02/10/w...
kptv.com
Widespread snow or freezing rain later this week
I was hoping that we could avoid a significant snow/ice event this winter, but now it appears something significant weatherwise is looming for Thursday and Friday
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Mark Nelsen @marknelsenweather.bsky.social · 05/02/2025
Wednesday forecast unchanged; lots of wet snow showers for morning commute. New weather blog post this evening: www.kptv.com/2025/02/05/w...
kptv.com
Wednesday forecast unchanged; lots of wet snow showers for morning commute
Almost all the evening forecast models are in and there aren’t any “meteorological surprises”. It’s been mainly dry in the I-5 corridor the last 3 days, but later tonight and Wednesday I expect wides...
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Reposted by Mark Nelsen
Climatologist49 @climatologist49.bsky.social · 05/02/2025
I interrupt your doomscrolling to bring even more doom. January 2025 was the warmest January on record globally - breaking the January record set just last year.
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Mark Nelsen @marknelsenweather.bsky.social · 04/02/2025
Sorry kids and teachers! “Sleddable” snow unlikely rest of this week in the I-5 corridor. Just finished a new weather blog post www.kptv.com/2025/02/04/s...
kptv.com
Sorry kids and teachers! “Sleddable” snow unlikely rest of this week
Because most of the showers have been over and west of the Coast Range, the best accumulations have been out there as well. This will be the case tonight and Tuesday too
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Mark Nelsen @marknelsenweather.bsky.social · 03/02/2025
New weather blog post. Big message? Kids, you need get your homework done tonight, but I'll try to get a bit more snow midweek. Plus, some of the driest parts of Oregon have a tremendous snowstorm on tap next 3 days www.kptv.com/2025/02/03/s...
kptv.com
Spots of snow Monday morning, but possibly more substantial snow Wednesday
Kids, get your homework done. Most of you will be headed to school the next two days, but we should at least see some flakes in the air
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Mark Nelsen @marknelsenweather.bsky.social · 01/02/2025
End of week weather blog post just finished. Big picture: relatively uneventful in lowlands through the weekend, but more interesting as we get into next week.https://www.kptv.com/2025/02/01/sticking-snow-chance-increasing-next-week-lowlands/
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Mark Nelsen @marknelsenweather.bsky.social · 31/01/2025
New weather podcast just dropped. Of course it's all about the upcoming snow setup, plus an introduction to our newest team member, meteorologist Payton Major. She grew up right here in Beaverton! Plus, Camila went on quite a rant about those weather apps. Video here: www.kptv.com/podcasts/wea...
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Mark Nelsen @marknelsenweather.bsky.social · 30/01/2025
First Alert Weather Days next week; first winter snow chance in the lowlands. New weather blog post this evening www.kptv.com/2025/01/30/f...
kptv.com
First Alert Weather Days next week; first winter snow chance in the lowlands
After a record-breaking January dry spell we've got a cold February start ahead, including pretty good chances for lowland snow!
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Mark Nelsen @marknelsenweather.bsky.social · 30/01/2025
Working on weather blog post later this evening, but forecast hasn't changed. Cold showers (mainly snow) come/go Sunday night through Wed lower elevations. Could impact mainly morning commutes. Watching closely to see if cold arctic air pours through Gorge later next week and causes trouble 😲
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Reposted by Mark Nelsen
NOAA Climate.gov @climate.noaa.gov · 29/01/2025
Record snowfall fell across several southern states last week, including as far south as some Gulf Coast beaches. Some locations accumulated 10.0 or more inches, recording more snow so far this winter than many locations up north, including Chicago! Read more: www.climate.gov/news-feature...
Snowfall totals map pf rare and historical snowfall event across the South from January 20th through the 22nd, 2025.
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Mark Nelsen @marknelsenweather.bsky.social · 27/01/2025
Finally, hope for some interesting weather. But snow into the lowlands? We'll see. Just finished up a new weather blog post this afternoon: www.kptv.com/2025/01/27/w...
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Mark Nelsen @marknelsenweather.bsky.social · 24/01/2025
Working on winter wx presentation (it's boring right now). Biggest snowstorms in Portland's history; 3-day totals. We know it used to snow a lot more 150 years ago, but look at some of those storms! Honorable mentions (not in Top 5) are January 1980, January 2017.
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Mark Nelsen @marknelsenweather.bsky.social · 22/01/2025
25° at PDX this morning, edged out Sunday's 26° for coldest of winter...so far. Not pipe-busting cold, especially with days in the 40s, in fact good for our gardens. Repeated cold nights like this really keeps them in dormancy well
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Mark Nelsen @marknelsenweather.bsky.social · 22/01/2025
...more than Portland's combined winter (0) plus last winter's total (1.6")
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Reposted by Mark Nelsen
Ryan Voutilainen @yvrwxwatcher.bsky.social · 22/01/2025
#SantaMonica: A parade of #Oregon state fire trucks & firefighters that were in #SoCal to help local fire crews battle the #PalisadesFire and others in #LosAngeles making their way out after fewer fires this Santa Ana wind event. Malibu & Pacific Palisades in the distance. #CAwx
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Mark Nelsen @marknelsenweather.bsky.social · 18/01/2025
We may have called it episode 125 in the podcast, but episode 124 has dropped! We dive into the models for clues on whether a cold snap is ahead. Plus we're bringing back the term of the week AND as always-- cool viewer photos! Video version here: www.kptv.com/podcasts/wea...
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Mark Nelsen @marknelsenweather.bsky.social · 15/01/2025
Inversions, dry weather, & chilly nights ahead. Fresh weather blog post this evening: www.kptv.com/2025/01/15/i...
kptv.com
Inversions, dry weather, & chilly nights ahead
We’re headed into a colder pattern over the weekend and early next week. Not so much during the day, but nights turn significantly colder. Not "pipe-busting” cold, but just a couple notches colder tha...
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Mark Nelsen @marknelsenweather.bsky.social · 14/01/2025
Gloomy again today under the inversion/clouds/fog in western valleys, EXCEPT a small area downtown Portland eastward to the mouth of the Columbia River Gorge (some dry east wind). 3 dots are Hillsboro, PDX, & Troutdale. Drove with sunglasses first 1/2 of commute, then it got dark... Sunnier tomorrow
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Mark Nelsen @marknelsenweather.bsky.social · 11/01/2025
One more mild & mainly dry week, then colder weather pattern lurks for 2nd half of January. Details in new weather blog post: www.kptv.com/2025/01/11/o...
kptv.com
One more mild & mainly dry week, then colder weather pattern lurks for 2nd half of January
This winter has been very mild so far; in fact Portland is experiencing its 3rd warmest start. That’s December 1st to January 10th. Last winter and 1950-51 were slightly warmer. But there are strong h...
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Mark Nelsen @marknelsenweather.bsky.social · 08/01/2025
A historic damaging wind event in southern California this evening with at least two fires raging. The gusts 70-80+ in some flatland locations (Burbank Airport) are particularly amazing
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Mark Nelsen @marknelsenweather.bsky.social · 06/01/2025
Mild & drier this week; but hints of colder weather in late January. Details in evening weather blog post www.kptv.com/2025/01/06/m...
kptv.com
Mild & drier this week; but hints of colder weather in late January
This mild weather continues for at least 10 more days, through at least the 15th, but there are hints that a weather pattern change could be ahead
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Mark Nelsen @marknelsenweather.bsky.social · 06/01/2025
That pretty much covers it...along with this graphic
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Mark Nelsen @marknelsenweather.bsky.social · 06/01/2025
A strip of snowy/icy roads
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Mark Nelsen @marknelsenweather.bsky.social · 31/12/2024
A cool La Niña winter? Not yet, with more warm weather ahead in early January. How the final weather blog post of 2024 started with a visit to the dentist today www.kptv.com/2024/12/31/c...
kptv.com
A cool La Niña winter? Not yet, with more warm weather ahead in early January
This mild (warmer than normal) weather pattern continues through at least the first week of January, with strong hints it may last through at least the 10th. If you only travel in the lowlands, I woul...
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Mark Nelsen @marknelsenweather.bsky.social · 31/12/2024
Western OR/WA now in the coldest time of year (on average). PDX low/high temp bottoms out at 36/46 for about 3 weeks centered on late December. Of course in any one year the coldest temp of winter can occur anytime from late-November to mid-February
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Mark Nelsen @marknelsenweather.bsky.social · 30/12/2024
Thickest ice accretion (freezing rain) I've experienced. December 29, 1996 in Corbett (Oregon). Two consecutive ice storms. Parked school bus perpendicular to 70+ mph wind gusts. 3-4" ice on one side, but bare on the other; it's leaning INTO that wind. ~4-5" of rain during this event, all below 32°
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Mark Nelsen @marknelsenweather.bsky.social · 30/12/2024
Meanwhile the western USA (west of Rockies) may see a dramatic slowdown in weather first half of January. BUT, will it be a "dirty ridge" with weak, warm systems and clouds making it through? Or a sharp ridge with sunshine, east wind blasting out of Gorge, and valley fog away from that wind? #TBD
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Mark Nelsen @marknelsenweather.bsky.social · 30/12/2024
So "warm" this month, we've seen night after night with temps way above normal. I loved the bright sunshine with cold nights the first few days of the month; wouldn't mind seeing that with more sun. > Right now December is running 3rd warmest on record, after Dec 1950 and Dec 2023.
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Mark Nelsen @marknelsenweather.bsky.social · 24/12/2024
Snow levels linger near passes through Saturday = mix of wet snow and rain at that elevation. But BIG snow up high! Up to 4 feet through the weekend
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Mark Nelsen @marknelsenweather.bsky.social · 24/12/2024
Seems about right. Summers have warmed dramatically in PACNW, but winters not much different than when I grew up here in 70s/80s
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Mark Nelsen @marknelsenweather.bsky.social · 23/12/2024
A quick weather blog post covers the rest of December & 2024. I already filled in the "0" for this month's snow. Too soon? www.kptv.com/2024/12/23/r...
kptv.com
Rainy, occasionally windy, and warm Christmas week; plus a snowless December
ANOTHER bomb cyclone will be forming the next 24 hours well offshore, but out of the “danger zone”. The Euro model forecasts this low to drop from 994mb about sunrise Monday down to 960mb by 10pm Mond...
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Mark Nelsen @marknelsenweather.bsky.social · 19/12/2024
Excellent travel through Cascades with warmer-than-normal pattern. At least through Monday. Unfortunately no significant snow for skiing until early next week
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Mark Nelsen @marknelsenweather.bsky.social · 19/12/2024
New record high for December 18th in Portland. 60° this afternoon with the warm southerly wind. We stay mild through Christmas and beyond
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Mark Nelsen @marknelsenweather.bsky.social · 18/12/2024
Peak gust 112 mph at top of Magic Mile lift @timberlinelodge this morning as cold front passed. This happens more often than you think; usually during storms this wind gauge is locked in ice at 7,000' on Mt. Hood. Notice temp goes above freezing, then wind goes wild overnight.
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Mark Nelsen @marknelsenweather.bsky.social · 18/12/2024
Tonight it'll be warmer in Portland than any DAY so far this month. PDX hit 56° @ 6pm as south wind arrived. Temps remain above 50° for most of the metro area all night long. Tomorrow should be fantastic with partly cloudy skies and highs 55-60° in I-5 corridor. Christmas graphic needed of course
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Mark Nelsen @marknelsenweather.bsky.social · 14/12/2024
Fresh weather podcast this afternoon. Lots of model talk about what we're seeing heading toward Christmas. I always recommend the video version here: kptv.com/podcasts/wea... Episode 122 is down the page a bit
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Mark Nelsen @marknelsenweather.bsky.social · 12/12/2024
The snow will be light, but 1st of season in the central/eastern Columbia River Gorge tonight/Thursday. We'll call it a First Alert Weather Day out there for that reason. Enjoy and play some Christmas tunes as you watch the flakes fall; I-84 remains snow-free at river level since temps are marginal
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Mark Nelsen @marknelsenweather.bsky.social · 11/12/2024
Sorry kids! No sign of a cold pattern or snow in lowlands. New blog post this evening: www.kptv.com/2024/12/11/s...
kptv.com
Sorry kids! No sign of a cold pattern or snow in lowlands
December has been a bit cooler than normal so far, but all signs point to a mild 1-2 weeks ahead. There's no sign of a cold weather pattern that could bring snow down into the lowlands as we head towa...
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Mark Nelsen @marknelsenweather.bsky.social · 09/12/2024
Headed through Cascades this work week? Looks uneventful after leftover snow/ice Monday morning & midday. Then mainly bare through Friday. Likely snowy again at some point next weekend.
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Mark Nelsen @marknelsenweather.bsky.social · 04/12/2024
Strongest & coldest east wind of the season blasting out of the Columbia River Gorge this afternoon as pressure difference (gradient) climbs between The Dalles & Troutdale. Peak gusts (on map) 70-80 mph in western Gorge and 35-50 east metro (mainly east of I-205). More tomorrow, then calmer Thur.
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Mark Nelsen @marknelsenweather.bsky.social · 04/12/2024
#TheMoreYouKnow I had no idea
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