Alert archive / Oregon / Winter Storm Warnings in 2018

Winter Storm Warning 12, NWS Medford, OR

March 21, 20186 counties in Oregon; Siskiyou County, California

NWS Medford, OR issued this winter storm warning at Mar 21, 2018, 2:06 PM PDT for 6 counties in Oregon; Siskiyou County, California. It took effect at Mar 22, 2018, 11:00 PM PDT. It was in force for 46 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: Mar 21, 2018, 2:06 PM PDT (21:06 UTC)
In effect from: Mar 22, 2018, 11:00 PM PDT
Expired: Mar 24, 2018, 9:28 PM PDT
In force: 46 hr
Issued by: NWS Medford, OR

Counties Siskiyou County, CA, Coos County, OR, Curry County, OR, Douglas County, OR, Jackson County, OR, Josephine County, OR, Klamath County, OR

The radar

The Medford radar (KMAX), 65 km from the middle of the area, began a volume at 21:08 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, 9.1 hours before the alert went out and 36 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: 711 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 190 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 winter storm 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 winter storm warning went out at Mar 21, 9:55 AM PDT, 4 hours 11 minutes earlier.

Area forecast discussion, Mar 21, 9:55 AM PDT, 4 hours 11 minutes before

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In the hours before

Special weather statement, Mar 21, 1:48 PM PDT, 18 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
Mar 21, 2:30 AM PDT	Hazardous Seas Watch	MFR		10 hr
Mar 21, 12:57 PM PDT	Hazardous Seas Warning	MFR		46 hr
Mar 21, 2:06 PM PDT	Winter Storm Watch	MFR	Douglas, Jackson, Josephine, Klamath, Lake	27 hr

Nearby

Winter Storm Warnings in Oregon, 2018 Winter Storm Warnings in California, 2018 Every winter storm warning in 2018

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.