Alert archive / Washington / Flood Watches in 2007

Flood Watch 7, NWS Seattle, WA

December 1, 200711 counties in Washington

NWS Seattle, WA issued this flood watch at Dec 1, 2007, 3:48 PM PST for 11 counties in Washington. It took effect at Dec 3, 2007, 4:00 AM PST. It was in force for 28 hr.

The area

The counties it named.

The facts

Issued: Dec 1, 2007, 3:48 PM PST (23:48 UTC)
In effect from: Dec 3, 2007, 4:00 AM PST
Expired: Dec 4, 2007, 7:56 AM PST
In force: 28 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 23:48 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, 11.8 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Dec 1, 3:30 PM PST, 18 minutes earlier.

Area forecast discussion, Dec 1, 3:30 PM PST, 18 minutes before

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In the hours before

Local storm report, Dec 1, 1:08 PM PST, 2 hours 40 minutes before

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Local storm report, Dec 1, 1:32 PM PST, 2 hours 16 minutes before

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Local storm report, Dec 1, 2:23 PM PST, 1 hour 25 minutes before

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Local storm report, Dec 1, 2:23 PM PST, 1 hour 25 minutes before

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Local storm report, Dec 1, 2:35 PM PST, 1 hour 13 minutes before

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Local storm report, Dec 1, 3:29 PM PST, 19 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
Dec 1, 4:57 AM PST	Snow Advisory	SEW	San Juan	17 hr
Dec 1, 1:43 PM PST	Heavy Snow Warning	SEW		8 hr

Nearby

Flood Watches in Washington, 2007 Every flood watch in 2007

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.