Thunderstorms or showers in a post-frontal airmass generated damaging wind near Lacomb.
Every event with a place to put it. Tap one for its entry below.
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.
The episode as NWS PQR wrote it up.
Thunderstorms or showers in a post-frontal airmass generated damaging wind near Lacomb.
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 Feb 26, 2:58 PM PST, 32 minutes earlier.
Area Forecast Discussion
National Weather Service Portland OR
258 PM PST Mon Feb 26 2024
.SYNOPSIS...An active pattern will continue through midweek
with mainly rain in the low lands and a mix of rain and snow
for elevations above 2500 feet. Convective showers will continue
through this evening before instability wanes. A few flakes
will remain possible but no significant accumulations are
expected below 1000 feet. A lull in precipitation is expected
tonight and tomorrow morning before a warm front approaches the
area and brings another uptick in PoPs. Heavy precipitation is
expected late Tuesday night into Thursday morning as an upper
trough digs toward the PNW and a surface low swings a cold front
eastward.
&&
.SHORT TERM...THROUGH WEDNESDAY NIGHT...The region remains in a
post cold frontal regime with northwest flow advecting cold air
onshore which has created an unstable environment. Shower
activity is ongoing and will continue into the evening before a
relative lull tonight. A few of the convective showers have
tapped into the 200-300 j/kg of CAPE across the area which has
resulted in a handful of intra-cloud lightning strikes. A few
rumbles of thunder remain possible through this afternoon and
into early this evening before instability wanes with daytime
heating. A few of the more intense showers have been able to
produce isolated small hail and dustings of snow as low as 500
feet. A Winter Storm Warning remains in effect for heavy snow
across the Cascades with an additional 4-8+ inches possible
above 2000 feet through early tonight. The Coast Range remains
under a Winter Weather Advisory for an additional 2-4 inches of
snow through early tonight. A few flakes will still be possible
at lower elevations, including the Portland Metro, tonight as
temps approach the freezing mark. HREF probabilities for
temperatures <=34 degrees range from 20-50% tonight. However,
since temps have not been below freezing and are not expected to
remain below freezing for an extended period of time, little to
no snow accumulation is expected below 500 feet with only a
dusting possible on grassy or elevated surfaces.
Heights aloft will begin to rise this evening as weak ridging moves
in from the west. This will bring a lull in precipitation to the
area with chance (40-60%) PoPs across the higher terrain and slight
chance to low end chance (20-40%) PoPs across the Willamette Valley
and lower elevations. A strong surface low churning across the Gulf
of Alaska will bring a warm front toward the WA/OR coast tomorrow
which will bring an uptick in PoPs beginning Tuesday afternoon. This
will be all rain for locations below 4000 feet with a rain/snow mix
above 4000 feet. The surface low across the Gulf of Alaska will
slowly drift southeast along the British Columbia coast as a
supporting upper trough digs into the West Coast. The warm front
will move onshore Wednesday morning which will increase S/SW winds
and will advect moisture into the area. Sustained winds will be
generally between 20-25 mph with gusts of 35-45 mph with higher
winds above 2500 feet. PWAT values will increase to around 0.75
inches with persistent S/SW flow which will help produce high QPF
amounts from Tuesday night through Thursday morning. The Coast
Range could receive 2.5-4+ inches which could cause some hydro
issues along some coastal rivers. The valley could see 1.5-2
inches during the same time frame. The active pattern is
expected to continue into the weekend. /Batz
.LONG TERM...THURSDAY THROUGH MONDAY...Deterministic and
ensembles are in excellent agreement following the mid-week
warm-frontal system as a strong upper trough will deepen over
the eastern Pacific Wednesday into Saturday, spinning multiple
shortwaves and surface fronts into the PacNW as it progresses
overhead. At this point, ensembles indicate that a strong cold
front with moderate Pacific moisture will push into the PacNW
sometime Wednesday night into Thursday morning bringing another
round of heavier rain to the coast and interior locations
followed by lowering snow levels. The latest NBM indicates a
60-80% probability of 1+ inch of rain over 24 hours ending
Thursday afternoon for the interior lowlands and 70-90% for the
coast, but there's only a 5-10% probability of 2+ inches for the
interior lowlands and 10-40% for the coast. Snow levels fall
below 1500-2000 ft yet again by Thursday evening with the
potential for another round of moderate to heavy snow to the
Cascades and Coast Range through the end of the week - the 48
hour probability to meet or exceed 1 foot of snow over the
Cascades ending Friday afternoon sits at 90-100%. At this point
even lowland snow can't be ruled out as the core of the upper
trough moves overhead Thursday night into the weekend.
Currently NBM has a 20-40% probability of any snow during the
overnight/early morning periods, though less than a 10-15%
probability of 1+ inch.
Beyond this, periods of rain and mountain snow showers are
likely to continue into the weekend with the trough deepening
and slowly approaching the coast. Chances for weak thunderstorm
activity may return as well. But exploring ensemble members
shows uncertainty remains regarding exactly how far south the
trough will deepen and its longitudinal progression through the
Western US, all of which will dictate specific impacts to
western WA/OR. Keep an eye out for additional details in the
coming days. /Schuldt
&&
.AVIATION...Predominately VFR, with intermittent MVFR conditions
that will be associated with passing showers. Colder air aloft
will lower snow levels and bring a 15-25% chance of
thunderstorms across the airspace through 03Z Tuesday for inland
locations and 06Z Tuesday along the coast. Any thunderstorm
that does develop could produce small hail along with gusty and
erratic winds. Expect mountains and higher terrain to be
obscured through late Monday night. Mixed snow/rain showers at
inland terminals from 02Z-18Z Tuesday. This may reduce
visibilities at times. Little to no snow accumulations expected.
*NOTE: The observation out of KONP is generally limited to wind,
sky conditions and pressure at this time. Periodically cloud
cover, vis and present wx are reported but are unreliable.
PDX AND APPROACHES...Predominately VFR with intermittent MVFR
conditions. Lower flight levels will be associated with showers.
15-20% chance for thunderstorms through around 03Z Tuesday.
Gusty and erratic winds possible near thunderstorms along with
the possibility of small hail. Mixed snow/rain showers from
02Z-18Z Tuesday. Little to no snow accumulations expected. /42
&&
.MARINE...An active weather pattern is expected through this week.
Currently, a northwesterly swell is resulting in seas around 11
to 14 ft at 12 to 14 seconds, this will persist though Monday
night. A very broad, Alaskan low will bring a very active
weather pattern starting on Tuesday and persisting through at
least Friday. Tuesday, will see elevated winds and seas across
all waters, with a southerly winds shift with the first frontal
passage on Tuesday. Increasing winds with gusts up to 40 kt for
the outer waters as well as the possibility of a southerly jet
developing for the inner waters which will result in gusts up to
50 kt. Seas will also slowly build into the low to mid teens.
These elevated winds and seas are expected to start Tuesday
evening through Wednesday evening. A very brief break is likely
Thursday, but a more robust, westerly swell, will cause seas to
build into the mid to upper teens by Friday. /42
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR...Winter Weather Advisory until 1 AM PST Tuesday for Central Coast
Range of Western Oregon-Coast Range of Northwest Oregon-
Upper Hood River Valley.
Winter Storm Warning until 1 AM PST Tuesday for Cascade
Foothills in Lane County-Cascades in Lane County-Northern
Oregon Cascade Foothills-Northern Oregon Cascades.
WA...Winter Weather Advisory until 1 AM PST Tuesday for Willapa Hills.
Winter Storm Warning until 1 AM PST Tuesday for South Washington
Cascade Foothills-South Washington Cascades.
PZ...Hazardous Seas Warning until 1 AM PST Tuesday for Coastal waters
from Cape Shoalwater WA to Florence OR out 10 NM-Columbia
River Bar.
Small Craft Advisory from 1 AM to 10 PM PST Tuesday for Coastal
waters from Cape Shoalwater WA to Florence OR out 10
NM-Columbia River Bar.
Hazardous Seas Warning until 4 AM PST Tuesday for Coastal waters
from Cape Shoalwater WA to Florence OR from 10 to 60 NM.
Small Craft Advisory from 4 AM to 10 PM PST Tuesday for Coastal
waters from Cape Shoalwater WA to Florence OR from 10 to 60
NM.
&&
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National Weather Service Portland OR
1106 AM PST Mon Feb 26 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 AM Snow Sandy 45.40N 122.27W
02/26/2024 M2.0 inch Clackamas OR Trained Spotter
Station Elevation: 900 ft.
&&
DABThe Portland,OR radar (KRTX), 123 km away, was scanning. The volume nearest the first event began at 23:28 UTC.
1 thunderstorm wind. Local standard time, as filed.
Property owner reported damage to 6 trees, along with minor damage to a door and a roof of two separate out buildings located on the property. There was a line of thunderstorms that moved across the area at that time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2024Every state in 2024This day in weather historyWarnings in Oregon, February 2024
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: 1162473.