Oregon, 2022

Debris Flow and Flood in Oregon, June 11 to 12, 2022

June 11 to 12, 2022 · NWS PQR · 2 events in 2 counties and zones

Heavy rains from an atmospheric river caused minor flooding and debris flow.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PQR wrote it up.

Heavy rains from an atmospheric river caused minor flooding and debris flow.

What forecasters said that day

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 Jun 10, 8:23 PM PST, 3 hours 37 minutes earlier.

Area forecast discussion, Jun 10, 8:23 PM PST, 3 hours 37 minutes before
Area Forecast Discussion
National Weather Service Portland OR
923 PM PDT Fri Jun 10 2022

Updated Aviation and Marine discussions

.SYNOPSIS...Another batch of moderate to locally heavy rain is
expected for much of the forecast area tonight as another disturbance
interacts with a late season atmospheric river. The heaviest rain is
expected to slowly sag southward and decrease, affecting mostly areas
south and east of Salem Saturday morning. Scattered showers will
persist elsewhere until the next organized batch of rain arrives
Sunday afternoon, also affecting mainly the southern half of our
forecast area. Cool, less humid, and showery weather is expected
Monday, then the region should start drying out Tuesday or Wednesday.

&&

.SHORT TERM...Tonight through Monday...After a break in the precip
between weather disturbances this morning, KRTX doppler radar shows
rain spreading back into the region early this afternoon. Water vapor
and Blended Total Precipitable Water (TPW) imagery show a long
atmospheric river of moisture aimed toward Oregon, extending all the
way back to the tropical latitudes near the International Dateline.
TPW values on the order of 1.25 to 1.50 inches are in play over
northwest and west-central Oregon...perhaps even higher than that
given the 1.58 inches of TPW in this morning's 12z KSLE sounding.
These TPW values are unusually high for our CWA, but they aren't
all-time records. But this is why it feels a bit humid to some this
afternoon, with dewpoints in the upper 50s to mid 60s for most of the
forecast area. This moisture is expected to be available as the next
wave of low pressure, just now getting its act together in the
vicinity of 40N and 135-140W, moves across northwest and west-central
Oregon later tonight and early Saturday morning.

While the last batch of heavier rain impacted mainly the northwestern
half of our forecast area, tonight's batch is shown by the HREF to
focus a little further south. Rainfall rates will probably reach
their maximum as the above-mentioned wave of weak low pressure moves
onshore around midnight. At that time, most models show the
baroclinic zone sagging slowly southward, with the axis of heaviest
rainfall being near a line from Florence to eastern Clackamas County.
Given the moisture transport involved, rainfall rates should become
heavy with some orographically-favored areas possibly seeing 0.3 to
0.5 inch per hour between 10 PM this evening and around 8 AM Saturday
morning. Overall, a few locations may exceed 2 inches of rain in a
12-hour period, which could come close to overwhelming some creeks
and small streams. This would be most likely in our Oregon Cascade
foothills, where the high moisture content is likely very efficient
at melting off snow in the headwaters up higher in the Cascades.
Overall, most of the lowlands can expect another 0.50-1.00 inch of
rain by midday Saturday, with some coastal locations getting into the
1-2 inch range and, as mentioned above, some Cascade foothill
locations may exceed 2 inches.

Models show good agreement that the precip turns more showery
Saturday afternoon, though a few keep steadier precipitation over
portions of Lane County throughout the day. Models appear to have
latched on to another disturbance presently near 40N/155W that should
arrive late Sat night or Sunday morning. By then, the core of the
atmospheric river should be well to our south, but this wave will
still have plenty of moisture to work with over our CWA. Details are
uncertain in regards to the track this system will take, or where the
heaviest rain will fall. Cooler air on the back side of this system
will cause snow levels to dip to near Cascade pass level by Monday
morning. Monday looks to be a cool and showery day under the upper
trough. With 850 mb temps progged to be around 0 deg C, it'll be
tough for anyone to get much above 60 degrees Monday afternoon. But
with the sun nearly as strong as it gets, most of the lowlands should
be able to at least touch 60 degrees. Also, the combination of strong
June sunshine and cool temps aloft could touch off a couple of
thunderstorms Monday afternoon, especially east of the I-5 corridor.
Weagle

.LONG TERM...Tuesday through Friday...Ensemble systems indicate that
the Sunday shortwave trough will shift east of the region Monday
into Tuesday. Nonetheless, there should be enough moisture and cool
air aloft to keep showers going on Monday and perhaps even into
Tuesday. Shortwave ridging should at least briefly shift across the
Pacific Northwest Tuesday and/or Wednesday. This will likely bring at
least a 24-48 hour period of drier weather and allow temperatures to
moderate. However, most members in the EPS and a sizable number of
the GEFS and CMCE members suggest another shortwave trough will push
towards the Pacific Northwest Thursday...bringing with it another
round of rain to the region late next week. For what it's worth, the
12z WPC cluster analyses strongly suggest a troughy pattern returning
to the Pacific Northwest by next weekend.  Weagle/Neuman

&&

.AVIATION...06Z TAFs: As this atmospheric river continues to push
across the region bringing near record high amounts of moisture,
expecting a mix of MVFR and IFR conditions due to both vis and
ceilings, with some periods of LIFR due to low ceilings
overnight. The atmospheric river will be advecting southward
through the morning before weakening by 18Z Saturday. Stratiform
rain will then likely transition to showers with weak post-
frontal showers persisting through the day. Ceilings and vis will
improve to MVFR, further improving after 00z to VFR.

For detailed Pac NW aviation weather information, go online to:
https://weather.gov/zse

KPDX AND APPROACHES...MVFR with rain through the next 6-12 hours
as the atmospheric river intensifies. Slow improvement with
lingering showers expected through 18Z, before the weather system
really drops further south to bring VFR back to the area.

-Muessle/Kriederman

&&

.MARINE...An atmospheric river continues in southwesterly flow
over the waters and inland. Unseasonably high
moisture content with the atmospheric river impacting the waters
through early Saturday will result in areas of fog over the
waters, with visibilities below 1 statute miles at times.

Seas continue to subside as with winds. Seas around 4 to 6 ft at
10 seconds is expected through at least Monday. Southwesterly
winds may impact the waters closest to the shore increasing wind
waves there, however most of the waters will experience minimal
wind wave impacts. Expect light southwesterly winds, 5 to 10 kts
to transition to northwest by Saturday night.

On Sunday, another disturbance will pass over the waters from the
southwest which will likely bring another period of more active
weather. Will see winds intensify from the northwest where we
could see speeds around 10 to 15 kt with gusts up to 20 kt. Seas
likely will not respond in the same way as this is a fairly fast
moving system. Will likely see the combined swell become
northwesterly which, when combined with the northwesterly winds,
may increase wave heights slightly higher than currently forecast.
More settled weather is possible early next week if the high
pressure ridge that some models are attempting to build over the
waters actually develops.		   -Muessle/Kriederman

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...None.
&&

www.weather.gov/portland

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In the hours before

Local storm report, Jun 10, 7:35 PM PST, 4 hours 25 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE PORTLAND OR
835 PM PDT FRI JUN 10 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0832 PM     HEAVY RAIN       2 SSW OREGON CITY       45.32N 122.61W
06/10/2022  M2.00 INCH       CLACKAMAS          OR   TRAINED SPOTTER

            SINCE MIDNIGHT, 1.0 INCH IN 6 HOURS.

0803 PM     HEAVY RAIN       2 WNW LAKE OSWEGO       45.42N 122.73W
06/10/2022  M1.50 INCH       CLACKAMAS          OR   TRAINED SPOTTER

            SINCE 1PM.

0600 PM     HEAVY RAIN       2 ENE CAMAS             45.60N 122.38W
06/10/2022  M1.70 INCH       CLARK              WA   TRAINED SPOTTER

            24 HOUR TOTAL. NEW RECORD.

0600 AM     HEAVY RAIN       1 ESE WELCHES           45.33N 121.95W
06/10/2022  M1.75 INCH       CLACKAMAS          OR   TRAINED SPOTTER

            STATION ELEVATION: 1325 FT.

&&
Local storm report, Jun 10, 11:30 PM PST, 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PORTLAND OR
1230 AM PDT SAT JUN 11 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1159 PM     HEAVY RAIN       2 NE DURHAM             45.41N 122.74W
06/10/2022  M1.58 INCH       CLACKAMAS          OR   TRAINED SPOTTER

&&

CN
Local storm report, Jun 10, 11:33 PM PST, 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PORTLAND OR
1233 AM PDT SAT JUN 11 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1159 PM     HEAVY RAIN       MILWAUKIE               45.44N 122.62W
06/10/2022  M1.95 INCH       CLACKAMAS          OR   TRAINED SPOTTER

&&

CN
Local storm report, Jun 10, 11:47 PM PST, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PORTLAND OR
1247 AM PDT SAT JUN 11 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1159 PM     HEAVY RAIN       3 ESE CANBY             45.25N 122.63W
06/10/2022  M1.97 INCH       CLACKAMAS          OR   TRAINED SPOTTER

            2.41 INCHES FOR THE 24 HOUR PERIOD.

&&

CN

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flood, 1 debris flow. Local standard time, as filed.

Flood, Multnomah

When
June 11, 12:00 AM PST to 10:00 PM PST
Where
Multnomah County, 0.23 mi N of Bellrose to 0.27 mi S of Bellrose
Cause
Heavy Rain
Reported by
Broadcast Media
Coordinates
45.483, -122.520

Two people and one dog were rescued Saturday after being reportedly stranded along Johnson Creek, which began flooding Friday night as an atmospheric river drenched the metro area. Also, portion of the Eastbank Esplanade closed due to rising of the Willamette River.

Debris Flow, Clackamas

When
June 11, 12:00 PM PST to June 12, 12:00 PM PST
Where
Clackamas County, 15.8 mi SSW of Tawney to 16.97 mi SSW of Tawney
Cause
Heavy Rain
Reported by
Department of Highways
Coordinates
45.108, -122.071

Heavy rain caused debris flow covering HWY 224 about 5 miles from Ripplebrook.

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
Debris Flow
A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Oregon in 2022Every state in 2022This day in weather historyWarnings in Oregon, June 2022

Sources

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: 1038963, 1038964.