Alert archive / Washington / Flood Watches in 2012

Flood Watch 11, NWS Seattle, WA

March 29, 2012Grays Harbor County, Thurston County, Washington

NWS Seattle, WA issued this flood watch at Mar 29, 2012, 9:50 PM PDT for Grays Harbor County, Thurston County, Washington. It took effect at Mar 30, 2012, 12:00 PM PDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Mar 29, 2012, 9:50 PM PDT (04:50 UTC)
In effect from: Mar 30, 2012, 12:00 PM PDT
Expired: Mar 31, 2012, 12:18 PM PDT
In force: 24 hr
Issued by: NWS Seattle, WA
Flood severity: None

Counties Grays Harbor County, WA, Thurston County, WA

The radar

The Langley Hill radar (KLGX), 59 km from the middle of the area, began a volume at 04:49 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, 4.8 hours before the alert went out and 237 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: 530 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 561 m²/s²
0-3 km storm-relative helicity: 704 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 Mar 29, 8:46 PM PDT, 1 hour 4 minutes earlier.

Area forecast discussion, Mar 29, 8:46 PM PDT, 1 hour 4 minutes before

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In the hours before

Local storm report, Mar 29, 4:04 PM PDT, 5 hours 46 minutes before

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<body>
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    <section class="card" role="status" aria-live="polite">
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

Everything else NWS Seattle, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 30, 8:29 AM PDT	River Flood Warning	SEW	Thurston	24 hr
Mar 30, 8:37 AM PDT	Small Craft Advisory	SEW		12 hr
Mar 30, 2:48 PM PDT	Small Craft Advisory	SEW		56 hr

Nearby

Flood Watches in Washington, 2012 Every flood watch in 2012

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.