Alert archive / Washington / Flood Watches in 2011
Flood Watch 10, NWS Seattle, WA
NWS Seattle, WA issued this flood watch at Nov 21, 2011, 4:39 AM PST for 10 counties in Washington. It took effect at Nov 22, 2011, 6:00 AM PST. It was in force for 47 hr.
The area
The counties it named.
The facts
- Issued
- Nov 21, 2011, 4:39 AM PST (12:39 UTC)
- In effect from
- Nov 22, 2011, 6:00 AM PST
- Expired
- Nov 24, 2011, 4:47 AM PST
- In force
- 47 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, Snohomish County, WA, Thurston County, WA, Whatcom County, WA
The radar
The Seattle radar (KATX), 76 km from the middle of the area, began a volume at 12:40 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, 0.7 hours before the alert went out and 291 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
- 793 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 313 m²/s²
- 0-3 km storm-relative helicity
- 411 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 21, 4:20 AM PST, 19 minutes earlier.
Area forecast discussion, Nov 21, 4:20 AM PST, 19 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 20, 4:20 PM PST | High Wind Watch | SEW | San Juan | 19 hr |
| Nov 20, 4:20 PM PST | Wind Advisory | SEW | San Juan | 20 hr |
| Nov 20, 4:31 PM PST | Gale Watch | SEW | 11 hr | |
| Nov 20, 4:31 PM PST | Small Craft Advisory for Rough Bar | SEW | 8 days | |
| Nov 20, 4:31 PM PST | Small Craft Advisory for Winds | SEW | 17 hr | |
| Nov 20, 4:31 PM PST | Storm Watch | SEW | 11 hr | |
| Nov 21, 4:34 AM PST | Winter Storm Watch | SEW | 6 hr | |
| Nov 21, 9:14 AM PST | Storm Warning | SEW | 18 hr | |
| Nov 21, 9:51 AM PST | High Wind Warning | SEW | San Juan | 24 hr |
| Nov 21, 9:51 AM PST | Wind Advisory | SEW | 15 hr | |
| Nov 21, 10:13 AM PST | Winter Storm Warning | SEW | 41 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.