Alert archive / Washington / Flood Watches in 2012
Flood Watch 6, NWS Seattle, WA
NWS Seattle, WA issued this flood watch at Feb 20, 2012, 2:05 PM PST for 11 counties in Washington. It took effect at Feb 21, 2012, 10:34 AM PST. It was in force for 41 hr.
The area
The counties it named.
The facts
- Issued
- Feb 20, 2012, 2:05 PM PST (22:05 UTC)
- In effect from
- Feb 21, 2012, 10:34 AM PST
- Expired
- Feb 23, 2012, 3:43 AM PST
- In force
- 41 hr
- Issued by
- NWS Seattle, WA
- Flood severity
- None
Counties Clallam County, WA, Grays Harbor County, WA, Jefferson County, WA, King County, WA, Lewis County, WA, Mason County, WA, Pierce County, WA, Skagit County, WA, Snohomish County, WA, Thurston County, WA, Whatcom County, WA
The radar
The Seattle radar (KATX), 65 km from the middle of the area, began a volume at 22:06 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 12:00Z, 10.1 hours before the alert went out and 301 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
- 471 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 352 m²/s²
- 0-3 km storm-relative helicity
- 515 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 Feb 20, 9:30 AM PST, 4 hours 35 minutes earlier.
Area forecast discussion, Feb 20, 9:30 AM PST, 4 hours 35 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 |
|---|---|---|---|---|
| Feb 20, 3:11 PM PST | Gale Watch | SEW | 12 hr | |
| Feb 20, 3:11 PM PST | Small Craft Advisory for Rough Bar | SEW | 6 days | |
| Feb 20, 3:11 PM PST | Small Craft Advisory | SEW | 66 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.