Alert archive / Washington / Red Flag Warnings in 2010

Red Flag Warning 1, NWS Seattle, WA

August 16, 201013 counties in Washington

NWS Seattle, WA issued this red flag warning at Aug 16, 2010, 9:42 AM PDT for 13 counties in Washington. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 16, 2010, 9:42 AM PDT (16:42 UTC)
Expired: Aug 16, 2010, 8:00 PM PDT
In force: 10 hr
Issued by: NWS Seattle, WA

Counties Clallam County, WA, Grays Harbor County, WA, Jefferson County, WA, King County, WA, Kitsap County, WA, Lewis County, WA, Mason County, WA, Pierce County, WA, Skagit County, WA, Skamania County, WA, Snohomish County, WA, Thurston County, WA, Whatcom County, WA

The radar

The Seattle radar (KATX), 78 km from the middle of the area, began a volume at 16:45 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 nearest sounding before it

Quillayute State, WA (KUIL), launched 12:00Z, 4.7 hours before the alert went out and 152 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: 2132 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 18 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 red flag 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 red flag warning went out at Aug 16, 3:22 AM PDT, 6 hours 20 minutes earlier.

Area forecast discussion, Aug 16, 3:22 AM PDT, 6 hours 20 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
Aug 16, 8:46 AM PDT	Small Craft Advisory	SEW		15 hr
Aug 16, 3:55 PM PDT	Red Flag Warning	SEW	King, Lewis, Pierce, Skagit, Skamania, Snohomish and 1 more	26 hr

Nearby

Red Flag Warnings in Washington, 2010 Every red flag warning in 2010

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.