An unstable air mass developed as an upper trough moved into the area.
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The episode as NWS PQR wrote it up.
An unstable air mass developed as an upper trough moved into the area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Portland, OR wrote its last area forecast discussion before the first event at Mar 28, 9:51 AM PST, 2 hours 9 minutes earlier.
Area Forecast Discussion National Weather Service Portland OR 1051 AM PDT Mon Mar 28 2022 .UPDATE...Watching current satellite and radar, am noting areas of clearing in the cloud cover, as well as some showers having enough convective characteristics under cloud cover to show the potential instability. With the anticipated passage today of a smaller upper low embedded in the main upper trough, should have enough upper level cooling to increase the instability of the airmass today. Theta-e ridge pushing into the Cascades this morning should help to combine with the destabilization for a slight chance of thunder today. Have also noted most members of the HREF have increased their coverage and reflectivity intensity on their latest runs, including into the Willamette Valley. Though NBM has less than a 10% chance of thunder for the area, looking at all the above mentioned factors has led me to add a slight chance over the Cascades for the day, as well as the central and southeastern Willamette Valley this afternoon. The biggest limiting factor to all this will be cloud cover, especially with the warm front clouds pushing onshore into far NW Oregon now. But the clearing east of this cloud shield may give enough chance for surface heating to take advantage of the mid-level cooling. /Kriederman && .SYNOPSIS...A typical Spring weather pattern will bring a few rounds of rain showers today, Wednesday, and again next weekend. The intervening days will bring dry weather and milder temperatures. && .SHORT TERM...Today through Tuesday...An elongated trough will work eastward across the western CONUS today. The primary low circulation will remain well south, crossing California while the fairly separated northern open trough will mainly cross BC and northern Washington. This places our CWA in an area of deformation with the upper low center funneling moisture northward and then getting isentropically lifted upward. The base of this moisture is sitting near and just above the freezing level and is resulting in elevated showers and a couple of isolated thunderstorms thus far tonight. One tracked along the Cascade crest in the evening with a second cluster having tracked north along the Cascade foothills. Of the HREF ensemble members, only the HRW FV3 iteration is showing any notable convection. That said, it appears to be modestly overdone with the coverage of moderate modeled composite reflectivity, but the remaining four models are only indicating light shower coverage and no threat of thunderstorms whatsoever. In this particular case, the NBM Pot Thunder field seems to strike the proper balance among the near term solutions and have continued following it's guidance placing a 15-20% thunder probability over the Oregon Cascades through the morning hours today. Will otherwise see modest chances for showers across the rest of the area as the upper trough axis sweeps eastward today. Offshore high pressure then starts nosing onshore this afternoon to bring a gradual end to the showers through the evening. As the upper ridge builds overhead tonight, mid and high level skies will largely clear while moist low level onshore flow will keep clouds banked up against the terrain and inland valleys for most areas tonight. there may be enough clearing adjacent to the Coast Range east slopes that some patchy fog could develop under weak lee side shadowing. Tuesday will bring a nice mix of clouds and sun to start the day, but then high clouds start invading from the west as the next upper trough and associated cold front starts crossing inside 130W. Regardless, temperatures will remain rather mild and near normal for the date. /JBonk .LONG TERM...Tuesday night through Sunday...No appreciable change from the 00Z models regarding the remaining forecast for the week's period. Still have good agreement that the next trough will arrive Tuesday night with the attending cold front crossing the coast near 12Z Wednesday. Much cooler air accompanies this system and brings snow levels down to around 3000 feet Wednesday morning, however, this continues to be a fairly sharp trough and it's sending most of the energy swinging north into British Columbia. As such, QPF amounts are fairly meager. The northern Oregon/Southern Washington Cascades will be hard pressed to receive a half-inch of snow accumulation Wednesday leaving 2 inches at most for the Volcanos above 6000 feet. Northwesterly flow will keep light precip going for the terrain through Thursday night leaving most of Friday dry again. The progressive westerly flow brings another swift moving shortwave frontal system Friday night and Saturday with light rain and snow amounts very similar to Tuesday night and Wednesday. Sunday will feature similar drying to Thursday. Slightly beyond this forecast package is a system worth keeping an eye on. A significant moisture injection over the South China Sea Tuesday and Wednesday gets entrained in the Pacific sub-tropical jet. It will cross the Pacific, reaching the western North American coast Sunday night and next Monday. Most interesting is how both the operational GFS and ECMWF jointly pick up on this slug of tropical flow and slam it into the west coast at nearly the same time with similar intensity. Most of the moisture/precipitation hits the BC coast with some reaching south across the Olympics. This is mainly an "interesting" forecast development at this point as the time range is suspect at best, especially for moisture and wind fields. However, should the current modeled forecasts hold true in 8 days, there would be somewhere along the west coast where 2+ inches of rain will fall in less than 18 hours under very mild temperatures. /JBonk && .AVIATION...18z TAFs: Onshore flow continues Monday morning as a weak reinforcing cold front moves into the area. While the airmass will dry slightly, the lower atmosphere will become a little more unstable with the surge of this cold air aloft. Hence, scattered showers will redevelop this afternoon, with the potential even for an isolated rumble of thunder in the central and southern Willamette Valley and adjacent Cascades/foothills. Inland, a mix of MVFR and VFR ceilings will prevail through the remainder of the day and likely through the remainder of the TAF period, with HREF guidance giving probabilities of ceilings less than 3000 ft around 25-40% Monday afternoon and 50-70% Tuesday morning after around 11z. Along the coast, however, a relief from the current MVFR/IFR ceilings and return to VFR will be possible with the arrival of the back edge of clouds behind the approaching weak cold front. However, any clearing after drizzle/rain has added low level moisture could prove sufficient for fog formation in places along the coast, particularly where the wind drops off. This has not been added to TAFs because little guidance is suggesting it at this time, but conditions will be monitored for signs of fog development. For detailed regional Pac NW aviation weather information, go online to: https://weather.gov/zse KPDX AND APPROACHES...A mix of MVFR and VFR continues at 1750z Monday. VFR conditions are likely to become predominant this afternoon, though there is still around a 30% chance for MVFR ceilings (highest when isolated showers cross the terminal). A higher chance of MVFR ceilings exists Tuesday after roughly 10-12z. -Bumgardner && .MARINE...High pressure offshore will maintain weak pressure gradients through Tuesday with winds W to NW at 10 to 15 kt. Seas still holding at 4 to 6 ft. A weakening front will approach the region Tue night, with winds becoming more southerly during the day Tue. But, gradients not all that strong, with winds mostly 15 to 20 kt at most. Even with that, strongest winds will be north of Tillamook Head Tue night, with a few gusts 20 to 25 kt. Will hold of on any advisories for now, but will have day shift re-evaluate with new model data. Increased westerly swell behind the front will bring seas to 8 to 10 ft for Wed into Wed night. Then, another break with high pressure. But, active weather resumes later in the week, as another front pushes across the region later Fri and Fri night. && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...None. && www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland www.twitter.com/NWSPortland
The Portland,OR radar (KRTX), 96 km away, was scanning. The volume nearest the first event began at 20:02 UTC.
1 funnel cloud. Local standard time, as filed.
Report of funnel cloud about 1 mile north of Turner, Oregon. Location and track of funnel cloud estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2022Every state in 2022This day in weather historyWarnings in Oregon, March 2022
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1015548.