Alert archive / Washington / Flood Watches in 2018
Flood Watch 9, NWS Seattle, WA
NWS Seattle, WA issued this flood watch at Nov 3, 2018, 4:00 AM PDT for King County, Snohomish County, Whatcom County, Washington. It took effect at Nov 4, 2018, 7:00 AM PST. It was in force for 21 hr.
The area
The counties it named.
The facts
- Issued
- Nov 3, 2018, 4:00 AM PDT (11:00 UTC)
- In effect from
- Nov 4, 2018, 7:00 AM PST
- Expired
- Nov 5, 2018, 3:40 AM PST
- In force
- 21 hr
- Issued by
- NWS Seattle, WA
- Flood severity
- None
Counties King County, WA, Snohomish County, WA, Whatcom County, WA
The radar
The Seattle radar (KATX), 51 km from the middle of the area, began a volume at 11:01 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 nearest sounding before it
Salem/Mcnary, OR (KSLE), launched 00:00Z, 11.0 hours before the alert went out and 368 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1367 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flood watch 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 flood watch went out at Nov 3, 4:00 AM PDT, 0 minutes earlier.
Area forecast discussion, Nov 3, 4:00 AM PDT, 0 minutes before
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</html>The office that day
Everything else NWS Seattle, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 2, 9:02 PM PDT | Small Craft Advisory | SEW | 4 days | |
| Nov 3, 3:41 AM PDT | Gale Watch | SEW | 12 hr | |
| Nov 3, 4:00 AM PDT | Wind Advisory | SEW | San Juan | 25 hr |
| Nov 3, 3:51 PM PDT | Gale Warning | SEW | 23 hr | |
| Nov 3, 3:51 PM PDT | Small Craft Advisory for Rough Bar | SEW | 24 hr |
Nearby
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.