A frontal system and a warm front moved across Western Washington in the beginning of April, breaking some rainfall records over the area.
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The episode as NWS SEW wrote it up.
A frontal system and a warm front moved across Western Washington in the beginning of April, breaking some rainfall records over 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 Seattle, WA wrote its last area forecast discussion before the first event at Apr 8, 8:32 AM PST, 28 minutes earlier.
Area Forecast Discussion
National Weather Service Seattle WA
932 AM PDT Mon Apr 8 2024
.SYNOPSIS...A frontal system will move across western Washington
through Tuesday for steadier precipitation and breezy winds.
Ridging will build into the Pacific Northwest mid-week for drier
weather. An upper low will slide along the West Coast Friday into
the weekend.
&&
.SHORT TERM /TODAY THROUGH WEDNESDAY/...Light rain continues to
spread inland through the interior lowlands this morning,
including the Seattle metro ahead of a weakening warm front and
surface low. Snow levels will initially be 2500 to 3500 feet this
morning before rising to 4000 to 5500 tonight in the warm sector.
Portions of central Puget Sound will likely remain in a rain
shadow into this afternoon with zonal flow aloft, with the
heaviest QPF along the Olympic Peninsula and northern Cascades. In
addition, southerly winds will increase this morning, peaking
this afternoon into this evening, with the strongest winds across
Admiralty Inlet and western Whatcom/Skagit Counties where gusts
will range 30 to 40 MPH. A cold front will then slide southwards
later tonight into Tuesday morning with steadier precipitation
transitioning to showers Tuesday morning. Conditions will also dry
out Tuesday afternoon into Tuesday evening with a ridge nudging
into the area. Some sunshine can be expected by Tuesday afternoon,
particularly for the Olympic Peninsula and northern Puget Sound.
Ridging will build further into western Washington Tuesday night
through Wednesday for drier weather. High clouds will likely
continue at times on Wednesday with southwest flow aloft. Patchy
fog will also be possible Wednesday morning with residual moisture
at the surface. Highs in the low 50s today will warm into the mid
50s to low 60s by Wednesday.
.LONG TERM /THURSDAY THROUGH SUNDAY/...The upper ridge will
flatten on Thursday with troughing developing across the NE
Pacific. Precipitation chances increase on Thursday, particularly
for the Olympic Peninsula, as the upper trough approaches the
area. Ensembles suggests the majority of the energy associated
with the upper low slides southward towards California Friday into
Saturday. However, given the proximity of the upper low, continued
precipitation chances remain in the forecast, but split flow is
possible late week. Troughing may then develop into British
Columbia later in the weekend for additional precipitation
potential. Generally near normal temperatures for the area into
the weekend.
JD
&&
.AVIATION...Westerly flow aloft as a shortwave trough passes across
British Columbia and a weakening frontal system moves across Western
Washington. A mix of VFR and MVFR as light rain moves across the
region in association with a warm front, with all terminals
primarily dropping to MVFR levels by around 20Z, where they should
generally remain through the night and into early Tuesday morning.
Rain has spread across the Puget Sound terminals, though rain
shadowing off the Olympic Mountains should keep the rain light to
showery across these terminals through the day and into tonight.
South-southwest winds increasing through 18-20Z 10 to 15 kt with
gusts from 20 to 25 kt. Winds should gradually diminish through the
overnight as gusts drop off.
KSEA...VFR conditions with light rain this morning, causing CIGs to
lower to MVFR by 20-22Z. South-southwest winds 5 to 10 kt this
morning will increase to around 12 to 16 knots around 21Z, with
gusts up to 25 kt possible through the evening. Southwest wind gusts
should slowly diminish through the early overnight. MVFR ceilings
will likely linger through the evening and into the overnight.
Davis/Mazurkiewicz
&&
.MARINE...A frontal system approaching the area waters is still on
track, with Small Craft Advisories posted for all of the coastal
waters. Southerly winds will begin to increase throughout the
Northern Interior Waters, the East Entrance of the Strait of Juan de
Fuca and Puget Sound, and Admiralty Inlet where Small Craft
Advisories are also posted. Winds will continue throughout the
evening and start to ease over the coastal waters overnight, while
Small Craft Advisory winds will linger through Puget Sound into
Tuesday.
A push of westerlies down the Strait of Juan de Fuca during Tuesday
morning into the afternoon will likely prompt additional headlines.
High pressure will develop offshore Wednesday into early Thursday,
bringing calmer marine conditions, with advisory-level wind gusts
possible across the offshore waters Thursday afternoon as a weak
cold front crosses the area waters.
Combined seas generally between 6 to 8 feet will continue through
midweek.
Davis/Mazurkiewicz
&&
.HYDROLOGY...No river flooding is expected over the next seven
days. While a wet system on Monday and Tuesday will cause many
local rivers to rise, rivers across western Washington are
currently forecast to stay below action stage.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 11 PM PDT this evening for Admiralty
Inlet-Coastal Waters From Cape Flattery To James Island 10
To 60 Nm-Coastal Waters From Cape Flattery To James Island
Out 10 Nm-Coastal Waters From James Island To Point
Grenville 10 To 60 Nm-Coastal Waters From James Island To
Point Grenville Out 10 Nm-Coastal Waters From Point
Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters
From Point Grenville To Cape Shoalwater Out 10 Nm-East
Entrance U.S. Waters Strait Of Juan De Fuca-Northern Inland
Waters Including The San Juan Islands-West Entrance U.S.
Waters Strait Of Juan De Fuca.
Small Craft Advisory until 5 AM PDT Tuesday for Puget Sound and
Hood Canal.
&&The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
A record rainfall of 2.38 inches was set at Quillayute Airport on April 8th, breaking the old record of 1.92 inches set in 2003.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2024Every state in 2024This day in weather historyWarnings in Washington, April 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: 1177717.