Alert archive / Oregon / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 19, NWS Portland, OR

November 14, 2017Clatsop County, Oregon

NWS Portland, OR issued this severe thunderstorm warning at Nov 14, 2017, 6:30 AM PST for Clatsop County, Oregon. It was in force for 14 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Nov 14, 2017, 6:30 AM PST (14:30 UTC)
Expired: Nov 14, 2017, 6:44 AM PST
In force: 14 min
Issued by: NWS Portland, OR
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Clatsop County, OR

The radar

The Portland,OR radar (KRTX), 67 km from the middle of the area, began a volume at 14:33 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 2.5 hours before the alert went out and 412 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: 8 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 133 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Portland, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at Nov 14, 3:49 AM PST, 2 hours 41 minutes earlier.

Area forecast discussion, Nov 14, 3:49 AM PST, 2 hours 41 minutes before

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In the hours before

Special weather statement, Nov 14, 5:29 AM PST, 1 hour 1 minute before

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Special weather statement, Nov 14, 6:00 AM PST, 30 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        Please try again in a few minutes.
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The office that day

Everything else NWS Portland, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 14, 2:52 AM PST	Storm Warning	PQR		12 hr
Nov 14, 4:12 AM PST	Winter Weather Advisory	PQR		71 hr
Nov 14, 4:24 AM PST	High Wind Watch	PQR		5 hr
Nov 14, 6:18 AM PST	Special Marine Warning	PQR		27 min
Nov 14, 11:58 AM PST	Special Marine Warning	PQR		32 min
Nov 14, 2:38 PM PST	Flood Watch	PQR		21 hr
Nov 14, 5:29 AM PST	Special Weather Statement	PQR	Pacific	31 min
Nov 14, 6:00 AM PST	Special Weather Statement	PQR	Pacific	30 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2017 Every severe thunderstorm warning in 2017

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.