Alert archive / Oregon / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 3, NWS Portland, OR

August 9, 2013Clackamas County, Linn County, Marion County, Oregon

NWS Portland, OR issued this severe thunderstorm warning at Aug 9, 2013, 5:22 PM PDT for Clackamas County, Linn County, Marion County, Oregon. It was in force for 23 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
Aug 9, 2013, 5:22 PM PDT (00:22 UTC)
Expired
Aug 9, 2013, 5:45 PM PDT
In force
23 min
Issued by
NWS Portland, OR
Area
Storm-based polygon

Counties Clackamas County, OR, Linn County, OR, Marion County, OR

The radar

The Portland,OR radar (KRTX), 103 km from the middle of the area, began a volume at 00:22 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 00:00Z, 0.4 hours before the alert went out and 278 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-pSkew-T log-p diagram, Medford/Jackson, OR at 00:00Z on 2013-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 452 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 00:00Z on 2013-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
452 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
2186 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 6:50 PM PDTSevere Thunderstorm WarningPQRClackamas, Hood River25 min
Aug 10, 1:12 PM PDTSevere Thunderstorm WarningPQRLane, Linn33 min
Aug 10, 1:42 PM PDTSevere Thunderstorm WarningPQRLane, Linn48 min
Aug 10, 1:46 PM PDTSevere Thunderstorm WarningPQRLinn29 min
Aug 10, 2:15 PM PDTSevere Thunderstorm WarningPQRLinn30 min
Aug 10, 2:16 PM PDTSevere Thunderstorm WarningPQRLinn29 min
Aug 10, 2:45 PM PDTSevere Thunderstorm WarningPQRLinn, Marion30 min
Aug 10, 4:17 PM PDTSpecial Weather StatementPQRClackamas28 min
Aug 10, 4:41 PM PDTSpecial Weather StatementPQRClackamas34 min
Aug 9, 9:05 PM PDTSevere Thunderstorm WarningPQRSkamania25 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2013Every severe thunderstorm warning in 2013

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.