Alert archive / Washington / River Flood Warnings in 2021

River Flood Warning 96, NWS Seattle, WA

November 28, 2021Snohomish County, Washington

NWS Seattle, WA issued this river flood warning at Nov 28, 2021, 7:36 PM PST for Snohomish County, Washington. It was in force for 11 hr.

The area

The outline as issued.

The facts

Issued: Nov 28, 2021, 7:36 PM PST (03:36 UTC)
Expired: Nov 29, 2021, 6:26 AM PST
In force: 11 hr
Issued by: NWS Seattle, WA
Area: Storm-based polygon
Flood severity: Minor

County Snohomish County, WA

The radar

The Seattle radar (KATX), 20 km from the middle of the area, began a volume at 03:38 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Stillaguamish River at Arlington (ARLW1).

Action stage: 12.5 ft
Minor stage: 14 ft
Moderate stage: 17.5 ft
Major stage: 19 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 12167400, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

The text

As transmitted.

670 
WGUS46 KSEW 290336
FLWSEW

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Seattle WA
736 PM PST Sun Nov 28 2021

...The National Weather Service in Seattle WA has issued a Flood 
Warning for the following rivers in Washington...

  Stillaguamish River At Arlington affecting Snohomish County.

.The last push of rain will drive the Stillaguamish River just above 
flood stage this evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Additional information is available at www.weather.gov.

The next statement will be issued by late tonight at 115 AM PST.

&&


WAC061-290915-
/O.NEW.KSEW.FL.W.0096.211129T0336Z-211129T0902Z/
/ARLW1.1.ER.211129T0332Z.211129T0537Z.211129T0652Z.NO/
736 PM PST Sun Nov 28 2021

...FLOOD WARNING IN EFFECT FROM THIS EVENING THROUGH LATE TONIGHT...

* WHAT...Minor flooding is forecast.

* WHERE...Stillaguamish River At Arlington.

* WHEN...From this evening to early Monday morning.

* IMPACTS...At 14.0 feet, the Stillaguamish River will locally spill 
  over its banks.  Minor flooding around Silvana will occur...
  including over Pioneer Highway.  A stage of 14 feet on the 
  Stillaguamish River corresponds roughly to Phase 2 in the 
  Snohomish County Flood program.

* ADDITIONAL DETAILS...
  - At 7:25 PM PST Sunday the stage was 13.6 feet.
  - Forecast...The river will rise to 14.1 feet tonight and crest
    around 14.2 ft early Monday morning. It will then fall below
    flood stage later Monday morning.
  - Flood stage is 14.0 feet.
  - Flood History...This crest compares to a previous crest of
    14.1 feet on 01/26/2003.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4816 12211 4817 12223 4816 12237 4826 12240
      4823 12224 4824 12214


$$

12

2 follow-up statements

711 
WGUS46 KSEW 290833
FLWSEW

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Seattle WA
1233 AM PST Mon Nov 29 2021

...Observed flooding changed to Minor severity and increased in 
duration for the following rivers in Washington...

  Stillaguamish River At Arlington affecting Snohomish County.

.Rain has turned into showers over the Northern Cascades this 
evening. The river remains just above flood stage with waters 
expected to recede through the morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Additional information is available at www.weather.gov.

The next statement will be issued by this morning at 830 AM PST.

&&


WAC061-291645-
/O.EXT.KSEW.FL.W.0096.000000T0000Z-211129T2035Z/
/ARLW1.1.ER.211129T0332Z.211129T0625Z.211129T0835Z.NO/
1233 AM PST Mon Nov 29 2021

...FLOOD WARNING NOW IN EFFECT FROM EARLY THIS MORNING THROUGH THIS 
AFTERNOON...

* WHAT...Minor flooding is occurring.

* WHERE...Stillaguamish River At Arlington.

* WHEN...Until this afternoon.

* IMPACTS...At 14.0 feet, the Stillaguamish River will locally spill 
  over its banks.  Minor flooding around Silvana will occur...
  including over Pioneer Highway.  A stage of 14 feet on the 
  Stillaguamish River corresponds roughly to Phase 2 in the 
  Snohomish County Flood program.

* ADDITIONAL DETAILS...
  - At 12:10 AM PST Monday the stage was 14.1 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 12:10 AM PST Monday was 14.6 feet.
  - Forecast...The river is expected to fall below flood stage
    early this morning and continue falling to 6.2 feet late
    Wednesday evening.
  - Flood stage is 14.0 feet.
  - Flood History...This crest compares to a previous crest of
    14.1 feet on 01/26/2003.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4816 12211 4817 12223 4816 12237 4826 12240
      4823 12224 4824 12214


$$

45

469 
WGUS86 KSEW 291426
FLSSEW

Flood Statement
National Weather Service Seattle WA
626 AM PST Mon Nov 29 2021

...The Flood Warning is cancelled for the following rivers in 
Washington...

  Stillaguamish River At Arlington affecting Snohomish County.

.Rain has transitioned to showers over the Northern Cascades.

WAC061-291530-
/O.CAN.KSEW.FL.W.0096.000000T0000Z-211129T1426Z/
/ARLW1.1.ER.211129T0332Z.211129T0625Z.211129T0820Z.NO/
626 AM PST Mon Nov 29 2021

...FLOOD WARNING IS CANCELLED THIS MORNING...

The Flood Warning is cancelled for
  the Stillaguamish River At Arlington.

* ADDITIONAL DETAILS...
  - At 6:10 AM PST Monday the stage was 10.3 feet.
  - Forecast...The river will fall to 5.3 feet.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4816 12211 4817 12223 4816 12237 4826 12240
      4823 12224 4824 12214


$$

45

The office that day

Everything else NWS Seattle, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 29, 2:15 PM PST	Small Craft Advisory	SEW		5 days
Nov 29, 3:29 PM PST	Flood Watch	SEW	Clallam, Jefferson, Mason, Skagit, Snohomish, Whatcom	43 hr

Nearby

River Flood Warnings in Washington, 2021 Every river flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.