Alert archive / Oregon / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 20, NWS Medford, OR

August 9, 2013Jackson County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Aug 9, 2013, 4:19 PM PDT for Jackson County, Oregon. It was in force for 26 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, 4:19 PM PDT (23:19 UTC)
Expired: Aug 9, 2013, 4:45 PM PDT
In force: 26 min
Issued by: NWS Medford, OR
Area: Storm-based polygon

County Jackson County, OR

The radar

The Medford radar (KMAX), 39 km from the middle of the area, began a volume at 23:21 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, 11.3 hours before the alert went out and 9 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: 3 J/kg
Mixed-layer CIN: -341 J/kg
Mixed-layer LCL: 1211 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -7 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Medford, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 9, 2:57 PM PDT, 1 hour 22 minutes earlier.

Area forecast discussion, Aug 9, 2:57 PM PDT, 1 hour 22 minutes before

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In the hours before

Special weather statement, Aug 9, 1:30 PM PDT, 2 hours 49 minutes before

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Special weather statement, Aug 9, 2:53 PM PDT, 1 hour 26 minutes before

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Special weather statement, Aug 9, 3:08 PM PDT, 1 hour 11 minutes before

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Special weather statement, Aug 9, 3:40 PM PDT, 39 minutes before

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Special weather statement, Aug 9, 3:43 PM PDT, 36 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 1:30 PM PDT	Special Weather Statement	MFR		45 min
Aug 9, 2:53 PM PDT	Special Weather Statement	MFR		37 min
Aug 9, 2:57 PM PDT	Fire Weather Watch	MFR	Coos, Curry, Douglas, Harney, Jackson, Josephine and 3 more	14 hr
Aug 9, 3:08 PM PDT	Special Weather Statement	MFR	Josephine	37 min
Aug 9, 3:40 PM PDT	Special Weather Statement	MFR	Jackson	35 min
Aug 9, 3:43 PM PDT	Special Weather Statement	MFR	Curry	47 min
Aug 9, 3:50 PM PDT	Severe Thunderstorm Warning	MFR	Jackson	25 min
Aug 9, 4:04 PM PDT	Severe Thunderstorm Warning	MFR	Coos, Curry	26 min
Aug 9, 4:58 PM PDT	Special Weather Statement	MFR	Josephine	47 min
Aug 8, 5:49 PM PDT	Severe Thunderstorm Warning	MFR	Siskiyou	26 min
Aug 8, 6:13 PM PDT	Severe Thunderstorm Warning	MFR	Siskiyou	47 min
Aug 8, 6:19 PM PDT	Severe Thunderstorm Warning	MFR	Siskiyou	41 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2013 Every 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.