Alert archive / Washington / River Flood Warnings in 2018

River Flood Warning 28, NWS Seattle, WA

November 4, 2018Snohomish County, Washington

NWS Seattle, WA issued this river flood warning at Nov 4, 2018, 6:45 AM PST for Snohomish County, Washington. It took effect at Nov 4, 2018, 8:21 AM PST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Nov 4, 2018, 6:45 AM PST (14:45 UTC)
In effect from: Nov 4, 2018, 8:21 AM PST
Expired: Nov 4, 2018, 8:50 PM PST
In force: 12 hr
Issued by: NWS Seattle, WA
Area: Storm-based polygon
Flood severity: Minor

County Snohomish County, WA

The radar

The Seattle radar (KATX), 60 km from the middle of the area, began a volume at 14:45 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 North Fork Stillaguamish River near Arlington (ARGW1).

Action stage: 10.7 ft
Minor stage: 13 ft
Moderate stage: 14 ft
Major stage: 15 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 12167000, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood warning went out, 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 this river flood warning went out at Nov 4, 3:51 AM PST, 2 hours 54 minutes earlier.

Area forecast discussion, Nov 4, 3:51 AM PST, 2 hours 54 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 4, 3:22 AM PST	Gale Warning	SEW		98 min
Nov 4, 4:59 AM PST	River Flood Warning	SEW	Snohomish	9 hr
Nov 4, 5:04 AM PST	River Flood Warning	SEW	King	22 hr
Nov 4, 5:49 AM PST	River Flood Warning	SEW	King	14 hr
Nov 4, 6:45 AM PST	River Flood Warning	SEW	Mason	17 hr
Nov 4, 8:50 AM PST	Small Craft Advisory for Hazardous Seas	SEW		56 hr

Nearby

River Flood Warnings in Washington, 2018 Every river flood warning in 2018

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.